Mk1 MX5 1.6, i've finally done it

Mk1 MX5 1.6, i've finally done it

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willmagrath

Original Poster:

1,208 posts

146 months

Sunday 18th August 2019
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Yes, yes, another god damn Mx5, but I dont care tongue out They've always been a bit of bucket list car for me and i've finally been in a situation where I can afford to get one on the side (with the use of much man maths).

So here she is:



Spec: 1990 UK Spec 1.6 114(ish)hp, pulls very well!
147k on the clocks

Good bits:
Respray about 2 years
Mk2 roof with a heated rear screen, reasonably new.
Sills repaired by the looks of it
Good bodywork
6 months MOT, no advisories on last one
Bought from a big mx5 enthusiast who seems to have owned a few!

Bad bits:
Needs an exhaust
Bit rusty underneath (suspension components etc)
Few little oil leaks
Could do with a suspension refresh

Overall i'm going into ownership excited but nervous about what needs doing. If i'm honest i bought with heart over my head, but it looks so good I dont care too much.

I paid old style shed money for it and think its got good value in it if it all goes wrong tongue out

Insurance is the cheapest ive ever bought (£350, i'm 26 years old)

It's going to be a bit of a work in progress smile

Looking forward to picking it up tomorrow!

willmagrath

Original Poster:

1,208 posts

146 months

Sunday 18th August 2019
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Hot_Hatch_Fan said:
Congratulations on the purchase, they are cracking little cars and I say that as a serial mk1 mx5 owner!

Getting the suspension refreshed would be money well spent! An MX5 with sorted suspension is like night and day compared to a ‘tired’ one....

Enjoy!
Thank you pal. Yeah it's definitely a bit bouncy. New springs will be the first suspension purchase I think.

willmagrath

Original Poster:

1,208 posts

146 months

Sunday 18th August 2019
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Ahhh I'm going to do that too tonight, good shout

willmagrath

Original Poster:

1,208 posts

146 months

Monday 19th August 2019
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Sko77y said:
Looks a clean example, second hand parts for these are plentiful, plenty bargains to be had so shouldn't take much more man maths to get it how you want. They're pretty easy to work on as well. Did you go for classic car insurance?
Its clean on top, that's all that counts right?....

I did get classic insurance yes, used peter best, very good!

willmagrath

Original Poster:

1,208 posts

146 months

Monday 19th August 2019
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Just driven the wee beast home. First impressions pretty good! No big issues (yet) brakes well, pulls well and just goes about its stuff very well. The odd knock here and there but I've heard worse. Things that need doing over winter will be exhaust and suspension for sure, it's a bit bouncy

willmagrath

Original Poster:

1,208 posts

146 months

Monday 25th November 2019
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UPDATE: So 4 weeks after i bought the car, it had a bad misfire. After investigation it turned out to be the dreaded head gasket.

Not good ownership so far...

So it went off to a specialist (C&C Sparkes engineering, very good) and we agreed the best route was to find a new engine. After digging around I found one on ebay with decent miles and apparently well looked after, I really hope this is the case.

The new engine has had some of the "easy jobs when the engine is out" done: Cambelt, waterpump, full service, plugs and a new clutch for good measure.

Once underneath, it was found that the car had suffered a big knock to the underside at some point and needs some welding work as well as a patch of rust that needs sorting. Apart from that though...it looked pretty good under there for a 29 year old car and I cant wait to get it back this week!!

Its gonna be a big bill to foot (1.5x purchase price of the car) but it should be in decent order once finished

willmagrath

Original Poster:

1,208 posts

146 months

Monday 2nd December 2019
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Cambs_Stuart said:
Oh no. Here's hoping its one big bill then it's sorted. Hows the plans for suspension going?
I've just bought a fun car and was torn between an MX5 and a clio 172. I went for the 172 as it's a bit easier to justify as a town car, as i can fit my children in it.
But an MX5 is on my bucket list too.
The suspension will be basic, i set of coilovers and eventually a bushing refresh. coilovers will be done early feb, just before MOT. I've been a bit decadent and have a Fiesta ST as my other car so I get best of both worlds. Only have my mouth to feed mind tongue out

willmagrath

Original Poster:

1,208 posts

146 months

Sunday 12th January 2020
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Finally got round to fitting a new exhaust this weekend! Its a stainless steel mx5parts sports exhaust that i bought back in september but never got round to fitting. The old exhaust was littered with holes and sounded awful (see pictures).



Looks a lot bet now too.



This new one has straight mid section with no silencer so it's quite a bit louder. Sounds fantastic with a proper 'old school' rasp to it, completely transforms the car in my opinion and feels a wee bit peppier (4-5hp apparently).

Cannot wait for summer now!

willmagrath

Original Poster:

1,208 posts

146 months

Thursday 2nd April 2020
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Update:

Morning all,

Well, the mx5 has passed it's MOT. But not without a bit of work. Luckily, in this case it was just a front suspension ball joint and the rear calipers were a bit ceased so the handbrake was inefficient.

I was expecting more to be honest and was dreading the phone call, but luckily it wasn't too bad, for a 30 year old car...

Unfortunately, it went straight from the test centre into hiding where it will stay till this mess is over!

For those interested, all the work on this car has been done by C&C Sparkes Engineering near Woking in Surrey (great Pizza Express there I hear). He mainly specialises in MX5s and has been brilliant so far, very fair and good prices.

Other things i've done? Great question:

I bought new wheels for it. Wasn't a fan of the black original daisy wheels, so i bought some silver 5 spoke eunos alloys that happened to come with a great set of dunlops, all for £70! Result.

I'm also going to be painting a few bits. The wing mirrors matched the old wheels in black, but i don't like them. So they're going to body colour red. The interior is very bland so will be painting a few little bits in there too, nothing garish!

Stay safe all.


willmagrath

Original Poster:

1,208 posts

146 months

Thursday 2nd April 2020
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Nath911t said:
Looks nice in red.

They are great little cars for not a lot of money. I keep thinking of getting rid of mine but then I take it out for a drive (not recently) and then want to keep it. Mines a 95 Laguna blue UK, 1.8 done 76k. No power steering, central locking or electric windows. It's had some sill welding done but drives really nice.

Keep wondering if I should get a wind deflector for it.
Yeah its so much fun, i love it. Mine has power steering and electric windows which is weird. The windows are just problems though haha, always getting stuck.



willmagrath

Original Poster:

1,208 posts

146 months

Sunday 2nd August 2020
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Well, 4 months on I thought id update for those interested:

Necessary work:

Slave cyclinder; this packed up over night, tiny hole in it. So no gears could be selected. I ordered a replacement for £12.50 and fitted in 2 hours.

Water temp sensor; the engine was refusing to rev. Would get to 5k and hit a limit. After a few wrongly changed parts, someone advised I should change a water temp sensor (?!) and sh*t me, it worked.

Alternator pulley; the pulley was bent so after about 100 miles, it would wear down the belt just enough to go loose and make a racket.

Mods:

Suspension; I've finally fitted some decent suspension. I decide on a used pair of decent coilovers to keep the cost down and the way I saw it, ANYTHING was better than what was on it before. I sourced a set of Tein HR coilovers, probably about 10 years old for £200.
I replaced a few parts and fitted over a weekend. End price including parts and full wheel alignment was £350.

The difference in the way it drives is unbelievable, it's a completely different car now.

HT leads; because why not, fires up well and pulls a bit harder

Induction kit; I bought a used KN filter, bought some 90 deg silicone hose (to move it away from the hot exhaust) and butchered some kind of induction kit. Works well and sounds good.

Next up; new radiator as the old one is shagged and runs a tad hot. Then a roll cage and some 15" wheels (in white).

willmagrath

Original Poster:

1,208 posts

146 months

Sunday 6th December 2020
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Another quick update:

Well I bought a new radiator and it runs much cooler now! Not bad for £75 fix as these cars are toast f they run hot at any point, for any amount of time...

I've noticed a bizarre throttle issue. If i'm at, say, 50% throttle, the throttle seems to 'bounce' between 45% and 55%... it can be quite annoying. But this only happens under 4000rpm, above that it's fine. Somebody said I should try a new MAF and turn back through 90 degrees to its original position and this seems to have definitely improved things a lot, not cured it, but it's better.

I plan to do a few track days next year in it as I love track driving but have never wanted to put the wear on my daily car as I depend on it. For this, I want to sort a few things. The brakes and chuck a roll cage in it.

I'm currently part way through doing the brakes. An easy mod on these 1.6 models is to stick the carriers, discs and pads from a 1.8 in (the calipers are the same). The discs are a bit bigger and just offer better performance all round. So i found a full set of 1.8 brakes on facebook marketplace, with a caliper rebuild kit, for £90! I then spent 3 evenings in the garage rebuilding the calipers. I've also bought some yellowstuff pads to help on track. Bizarrely I heard nothing but great reviews about these until posting on a forum saying i'd bought some...ahhh i'm sure they'll be fine...

With these now sorted, I am now 3/4s of the way through fitting the new set. Pic below showing old 1.6 brakes compared to 1.8.





You may notice the disks are old...and yes, this is a mistake. After driving the car slowly (sub 15mph) around the local roads, i can feel that the discs are warped. So i'm going to change these now before I have to inevitably replace soon, and then have to replace the new pads too!!!

Like I said, i plan to fit a roll cage in the new year before my first track day. This will probably be a GC fabrications pr TR Lane one. Then, after all the swearing and shouting, it should be ready and pretty safe.

Hope you enjoyed the update.

willmagrath

Original Poster:

1,208 posts

146 months

Monday 7th December 2020
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snotrag said:
Tenner says its related to closed loop fuelling - the ECU on these cars uses closed loop fuelling below (IIRC) 4200 rpm and at part throttle- in other words its using the air temp and volume, engine coolant temp, and the exhaust lambda reading, to adjust the fuelling up or down (rich/lean).

Over 4200rpm (ish), the car uses the open loop fuelling tables. When the car has a fault that seems to disappear over this RPM, its almost certainly this system.

If the readings at lower RPMS from the various sensors are not correct, then the car defaults to a 'safe' mode of just running really rich, they run like crap, stumbly, use loads of fuel but at least its safe and doesn't cause damage unlike what would happen if the car ran lean.

You've already changed the Air Flow Meter (see note 1) and that didnt fix it, the air flow meter also contains the inlet temp sensor on a 1.6.

So I'd suggest it may be the o2 (lambda) sensor. A key indicator would be poor fuel economy, a smoky/sooty tailipipe (more than usual) and the key one is - unplug the lambda sensor. If unplugging it makes little difference to the way the car runs, its faulty.

A further proof of this would be to nail the car at full throttlle all the way through the rev range - at true full throttle, again the car runs in open loop, if it pulls cleanly all the way to red line from idle this ii further proof of the closed loop system being the fault.


The final option could be the engine temperature sensor - if the car thinks its still cold, it will also run rich (warm up mode) and cause it to be a bit stumbly. The engine ECU temp sensor used for controlling fuelling is the one on the back of the head, the sensor on the front drives the fan switch only.


(1).Note on a 1.6 its an Air Flow Meter (AFM), not a hot mire MAF (Mass Air Flow sensor). AFM is a moving flap that measures air volume by how much the flap is forced open - thats why its important that its correctly oriented, mounting them to the side means gravity changes how much the lightly sprung flap opens! Bit of a rubbish design, seen on lots of early fuel injection/ECU driven cars.

Finally, its hihgly unlikely to be the throttle position sensor - it doesnt know the difference between 40% throttle and 50% throttle unlike a modern car, its only a switch, and it only knows 'throttle closed' or 'throttle not closed' or 'fully open'. Its a switch, not a true discrete position.

Hope this helps!




Edited by snotrag on Monday 7th December 09:00
Wow, thank you very much for all the info, I'll definitely try this. Could help it to run even smoother!

willmagrath

Original Poster:

1,208 posts

146 months

Thursday 12th August 2021
quotequote all
Well, 2021 has been a great year with the MX5. Well, it started off damp and mouldy. Whilst waiting for a house purchase to go through I was living at home with parents and the car lived outside in the wet and many leaks were found. I spent every weekend with towels and sponges drying it out.

In March it passed it's MOT with almost flying colours, just need a small hole patching up. Classic MX5.

I then fitted a roll bar for track days, added rigidity and safety. See picture. I went for a GC fabrications one with a harness bar for any future purchases. It's amazing quality and comes with a nice authentication certificate.

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|https://thumbsnap.com/xxwTmsmy[/url]

The was running great and i decide it was time for a track day. A few pals and I booked a day at cadwell park. Amazing track and I had great day. The car survived the day and also made the 400 round trip to get there with not one issue.

Things I learnt from the day: new tyres needed, polybushing to be done and a sensor needs fixing to release a tad more power.

I also need to build more confidence in the car! It was great on track but in some corners I didn't trust it!



There's currently a problem with the clutch. The bite point moves up and down so I think a new master cyclinder is needed. It's drivable though!

Over winter I plan to sort some rust out, replace wheels and tyres and polybush the ARBs, it knocks a lot!

Thanks all.

willmagrath

Original Poster:

1,208 posts

146 months

Friday 13th August 2021
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D1bram said:
Nice work on the trackday! I've just had the suspension rebuilt and plan a Cadwell trip but think I've left it a little late this year.

Rollbar looks great - how much hassle was it to fit?
Cadwell is great for the MX5, tight and twisty, I loved it.

Yeah the roll bar is brilliant. It wasn't too bad, took much longer than advertised though, about 6 hours I'd say.

It's cutting the body work that takes time. If you've got an angle grinder you'll be fine, but I used tin snips. Worked ok but not as nice to look at. Luckily the carpet covers it now!

willmagrath

Original Poster:

1,208 posts

146 months

Monday 1st November 2021
quotequote all
Quick update:

Havent used the car much in the last few months unfortunately! It had been having a few clutch issues where the bite point tended to move up and down depending on a few factors like how far I'd driven etc. Sometimes it was so low you couldnt change gear. I tried to fix by moving the bite point by adjusting the pedal, but that only helped for a day or so. Unfortunately it properly gave up on a drive to my local Tescos, i got back to the car and the clutch did nothing. Damn. Queue a 4.5 hour wait for recovery in the car park.

I managed to find out that it was the clutch master cylinder that had died. Many of seals go bad over time and the unit fails. I bought rebuild kit for £19 and it's sorted. Aaaah 90's JDM cheapness.

Picture below of it being fixed:



Since then i started painting some old wheels I bought on eBay for £65. I want bigger 15" wheels so i can get better tyres for use on track. I considered spending maybe £300/400 but to save money, i bought some tatty MK2 mx5 ones and am slowly painting them. The world was my oyster in terms of colour. Considered a nice bronze but someone at work has a similar mx5 with white wheels. I know, i know...not to everyone's taste, but im hoping they'll look good.



And up against the car to get a feel for them... please ignore overspray, tires to be replaced!



I've only painted 2 so far as I've been too busy (took 5 hours to sand, prime and paint 2 of them).

The next job is to check out the brakes. Ive noticed under semi-hard braking, it pulls to the left. Ive only just rebuilt the calipers last winter, so hopefully it could just need a bleed.

I've also bought a MK1 RS spolier to fit, i think it should set the rear of the car off nicely. Just also need to paint that as it's currently blue!

I'm on the hunt for a sports cat too. I decatted the car 6 months ago as the original cat broke up, but it stinks and might be a bit too loud for me.

Later in winter before it's MOT in march i will look at getting the sills done. With values on the rise, I'd like to try and preserve this one!

Thanks for reading.

willmagrath

Original Poster:

1,208 posts

146 months

Tuesday 7th March 2023
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Been a while since I updated on this one. It's been running very well but I've hardly used it since October. It sits in the garage only to come out for the odd classic car meet. Most recently I headed to to Surrey for the Black Swan meet. It was great to use it after a few months but the brakes are done. Very warped and need replacing.



The wheels in the above pictures are now fitted with Michelin PS3s fitted all round. It's definitely different to drive and I can't wait to use it on a track day soon.



Unfortunately, rust has taken its toll on the sills and arches. My garage is annoyingly damp and its been dripping on the car. So I'm sending it in for long overdue sill work within the next month. It's going be expensive but will add enough value to the car to warrant it. The garage will then be properly sealed so it doesn't come back!!!

Other jobs to do: I have a very nice 4-2-1 manifold to fit. My downpipe has a leak and it sounds a bit terrible so I've got one of these to put on before summer.

willmagrath

Original Poster:

1,208 posts

146 months

Wednesday 8th March 2023
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Dave. said:
Where are you taking it to? I've had a bad experience with a so-called specialist, and seen/heard bad things about others too.

Don't rely on old reviews, you need recommendations from people who have had stuff done in the last few years so they've had time to see if the repair has been any good.
I've always used C and C sparkes in Surrey. They've done work for me before that seems OK. I had a quote from the MX5 restorer that was almost 5k!! Which I really won't pay haha. I'm asking for quotes now but no-one is responding

willmagrath

Original Poster:

1,208 posts

146 months

Wednesday 30th August 2023
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Update time!

Since the last update in March a few things have happened.

First up, through a mutual contact, I was approached to do a feature on Mike Brewer's website for a series called "Me and My Classic". Just had to be interviewed and send in pictures which was good fun.

Next up, the rust: so it finally failed its MOT for the sills and I just did it. I got my usual guy to do it and it seems a good job and a great colour match!

It was worse than thought and 2 layers deep. He took some pics of the work as he went:





I don't actually have any pics of the finished job. But in some of the next pictures you may be able to see it. I did get a momento though for my £1500...



Next up. Did a big trip from the South up to Yorkshire to tour around seeing some family.



We packed it full of camping gear, bags and emergency tools. Had stuff strapped to the roll bar and everything, so it certainly felt slower! It also highlighted that the suspension can't handle that weight and it didn't like some of bumpy roads at all. On the smooth, flowing twisties it was brilliant. But i didn't push it.

Did 900 miles in 10 days and it didn't complain 1 bit.