Punto GT

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Liquid Knight

Original Poster:

15,754 posts

183 months

Tuesday 16th August 2016
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So I'm dipping my toe in the Punto pool again or diving right in without looking to be more accurate.

Thanks to the Punto GT owners page on Facebook I bought this...





...I like to think of the car as a bit of a (very) rough diamond.



I'm not a fan of pod filters but the car is fitted with a recently rebuilt (I have the receipt) GT28 turbo from a Mitsubishi GTO, front mounted intercooler, new brakes up front and a lot of "potential".

She drove home okay but the first thing that had to go was the straight through pipe and motorbike can exhaust. Three reasons. First the car sounded like the percussion sections of an orchestra playing inside a tank and second the engine kept cutting out a trying to stall at slow speeds. The car wouldn't idle below 1,750rpm. Finally I had to slow for a horse on the road and it was completely humiliating. No matter what I did the bloody car would not shut up. Perfect for someone who leaves for work at 05:00 some mornings eh?

The plan was to fit the cat' from my Bravo but whoever did the down pipe...



...used black silicone to stick it to the rest...



...a pigeon to crap on the bits of pipe instead of welding it...



...and "measure five times cut once" made it clear the drive shaft eventually.

With a classic twin round pipe box selected and the middle box from the Bravo...

Oh, yes I didn't fit the cat' as the flexi-pipe was on the exhaust not the down pipe so when I make a new one of those I'll have to cut the flexi out then and do both jobs at the same time.

...and set of Ink blue painted Coupe 20V 16's the car is already taking shape...



...so much so that some waster of Oxygen tried to take my wheels the other night resulting in a bit of a mishap.



The car was perfect on the way to work but when I left it felt like a wheel weight had been dislodged, then it felt and sounded like the wheel bearing was shot. I slowed down to 20mph just as the wheel came off.

The wing wasn't badly bent out of shape and took a little convincing with a hammer but it doesn't look any worse than it did before.

So that's about it.

Not quite...



...silicone exhaust and cable tie front mount. banghead



At least I've mounted my Maserati Shamal horn properly.

So what are my plans?

The car is at a point where it could be a good road project or strip it out and hit the track.

The GT28 is a bit Jekyll and Hyde, nothing happens before you get to 4,000rpm and seventeen PSI kicks all the way to red. Ideal for pottering around the village and economy but a bit all or nothing faff for "B" roads.

Shopping list.

Wings
Sills
Floor sections leading up to the sills (DIY)

Original headlights, those Halo things look gash.

Down pipe that doesn't look like it was made underwater in the 16th Century (DIY).

Suspension that suspends the car. Coil overs are all well and good but...

Exhaust that might pass an MOT in this country.

Bumpers, mirrors, spoiler all matching.

Wheels and tyres. The 16's are nice but the 205-40 profile tyres are crap on Norfolk's roads.

Paint

Interior redress or rip out?

Edited by Liquid Knight on Tuesday 16th August 14:12

Vitorio

4,296 posts

143 months

Tuesday 16th August 2016
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Looks excellent LK! Was it really a crim trying to nick your coupe wheels, or did you just not do them up properly?

Liquid Knight

Original Poster:

15,754 posts

183 months

Tuesday 16th August 2016
quotequote all
Vitorio said:
Looks excellent LK! Was it really a crim trying to nick your coupe wheels, or did you just not do them up properly?
Hoody wearing twunt passenger in an Audi A3

The CCTV at work didn't get a mug shot but the car and turns out the number plate was from a Golf.

My first thought was my error but checked to make sure (before blaming someone else). wink

Vitorio

4,296 posts

143 months

Tuesday 16th August 2016
quotequote all
Liquid Knight said:
Hoody wearing twunt passenger in an Audi A3

The CCTV at work didn't get a mug shot but the car and turns out the number plate was from a Golf.

My first thought was my error but checked to make sure (before blaming someone else). wink
Such a shame people cant keep their grubby mitts off of other peoples things, never wouldve guessed fiat coupe wheels to be in demand though

Good thing you got off easy with little damage

Liquid Knight

Original Poster:

15,754 posts

183 months

Wednesday 17th August 2016
quotequote all
At the parts ordering stage. As soon as I collect my Spider I can take the Punto apart and take care of a few dozen issues.

The Punto GT owners page on Facebook has found me a pair of very good wings for the price of a new one. Just need to go to Birmingham to collect them. Another set of Coupe 20V wheels to slap track day rubber on.

I have a pair of bumpers ready for me to collect, shocks and lowered springs instead of the grounded coil overs and new headlights and mirrors are in the post. smile

Just need some sheet metal to make the floor up to the sills. It's always like peeling an onion when you do a sill repair. I do have metal ready for it but you never know if it's enough until you have made the car unsafe to get some more.

A sheet of metal to fill the knackered sunroof hole. Then I only need to work out how much paint I'll need and I'll be ready for a fun weekend. smile

Liquid Knight

Original Poster:

15,754 posts

183 months

Wednesday 17th August 2016
quotequote all
Headlights arrived today.



That's much better.


Liquid Knight

Original Poster:

15,754 posts

183 months

Wednesday 17th August 2016
quotequote all
When I fitted the headlights I moved the air filter and the MAF came off. I put it all back together and half way to the shop it started spluttering and was gutless. Stalling every time I stopped. I thought the MAF picked up a bit of dust or the plug worked loose when it moved. Checked it, cleaned the terminals, put it back and it made no difference. The car was lumpy, wouldn't run unless I pumped the throttle and the rev' counter was stuck on 2,000rpm.

Got the car home and fitted the spare throttle position sensor and MAF sensor that came with the car, started unplugging everything to clean terminals and followed wired and pipes from end to end to make sure nothing was snagged or split.

Nothing worked and it got progressively worse.

Black sooty smoke from the tail pipe (rich) but then white smoke started coming from the back of the engine.

Cracked turbo?

I'll have a proper look in the morning. She could be scrap by the afternoon. cry

Vitorio

4,296 posts

143 months

Thursday 18th August 2016
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Aww, i was just about to comment about how it is good to see you cracking on, would be an absolute shame if it died this quickly...

Best of luck checking it out LK!

Liquid Knight

Original Poster:

15,754 posts

183 months

Thursday 18th August 2016
quotequote all
Having eliminated an electrical or sensor issue I spent this morning chasing mechanical issues.



I knew the exhaust manifold had a sheered bolt to the turbo so this...



...was expected. I popped the manifold off to see if the stud could be extracted or drilled out only to find the manifold was cracked as well.



It can be repaired but anyone who has ever welded cast iron before will tell you it weakens the metal around it, the weld expands and contracts at a different rate causing more crack. As the manifold is now basically scrap I turned my attention to the down pipe...



...and quickly mocked something together...



...for when I can get hold of a new/replacement manifold. wink

Vitorio

4,296 posts

143 months

Thursday 18th August 2016
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Ah, so the turbo itself is fine then? good to hear!

Is DIYing a stainless manifold an options?

Liquid Knight

Original Poster:

15,754 posts

183 months

Thursday 18th August 2016
quotequote all
There isn't a lot of room in there for one. The water pipes and loom are close enough and to make all four ports the same length would be a bit of a faff to say the least. I've seen a couple...





...of messy mild steel ones. I think I'll stick to cast for all the difference it makes. wink

Liquid Knight

Original Poster:

15,754 posts

183 months

Thursday 18th August 2016
quotequote all
Re-studded, crack welded, all put back together, up and running.



Good news, the exhaust does not leak at all, anywhere and sounds pretty good. No more smoke from inside the engine bay.

Bad news, the old girl is still coughing, spluttering and if you don't pump the throttle the car barely crawls. Hit 3000rpm and she takes off as if nothing is wrong (unguided missile). Change above 3,000rpm and she pulls like a train but drop below and she bogs down again.

It's as if the car had a carb' and the slow running jet was knackered.

Hmmmmm... scratchchin

Vitorio

4,296 posts

143 months

Thursday 18th August 2016
quotequote all
Liquid Knight said:
Re-studded, crack welded, all put back together, up and running.



Good news, the exhaust does not leak at all, anywhere and sounds pretty good. No more smoke from inside the engine bay.

Bad news, the old girl is still coughing, spluttering and if you don't pump the throttle the car barely crawls. Hit 3000rpm and she takes off as if nothing is wrong (unguided missile). Change above 3,000rpm and she pulls like a train but drop below and she bogs down again.

It's as if the car had a carb' and the slow running jet was knackered.

Hmmmmm... scratchchin
Good to hear the mani is fixed, but that sub 3000 rpm bogdown is odd, wouldnt know where to start debugging that, does it have a cam variator? (which i wouldnt expect to kick in around 3K though)

Liquid Knight

Original Poster:

15,754 posts

183 months

Thursday 18th August 2016
quotequote all
Rule one of Pandaing

If you think you have a fuel problem check the rotor arm and distributor cap first.

I'm going to check, clean and/or replace the plugs first thing and then buy a compression tester.

Vitorio

4,296 posts

143 months

Thursday 18th August 2016
quotequote all
Liquid Knight said:
Rule one of Pandaing

If you think you have a fuel problem check the rotor arm and distributor cap first.

I'm going to check, clean and/or replace the plugs first thing and then buy a compression tester.
Ah, that thing has a mechanical distributor?

Good luck trying to get it running properly!

Liquid Knight

Original Poster:

15,754 posts

183 months

Thursday 18th August 2016
quotequote all
Looks like a coil pack where the distributor should be (if it was a 128).

Liquid Knight

Original Poster:

15,754 posts

183 months

Thursday 18th August 2016
quotequote all
Rain forecast all weekend and I'd rather not have to ride my bike. hehe

Liquid Knight

Original Poster:

15,754 posts

183 months

Thursday 18th August 2016
quotequote all
Ah-ha!

Just a thought. The reason the low rpm richness could be due to air issues. 3,000rpm means boost could compensate for this so I could have a nipped pipe somewhere or a leak.

Vitorio

4,296 posts

143 months

Friday 19th August 2016
quotequote all
Liquid Knight said:
Ah-ha!

Just a thought. The reason the low rpm richness could be due to air issues. 3,000rpm means boost could compensate for this so I could have a nipped pipe somewhere or a leak.
Ah, good call!

Does it the PGT not have a MAP sensor to adjust fuel though? (probably not, given its a rather old and probably crude turbo setup)

Liquid Knight

Original Poster:

15,754 posts

183 months

Friday 19th August 2016
quotequote all
Pressurised the air system to check for leaks. Nope.

The clips that held the pipe from the MAF to the turbo were knackered (over tightened and no longer gripping) so they have been replaced.

The plugs are nearly new but I cleaned them anyway.

So, it's not a sensor issue, not a mechanical issue, not an air loss issue, not the pugs.

ECU?

bks that's scrap then. rolleyes