Emissions, mot failure

Emissions, mot failure

Author
Discussion

Neathtvr

Original Poster:

20 posts

65 months

Friday 14th June
quotequote all
Car been lying idle in garage for approx 3 years since last mot. Been started up occasionally but not taken for a run on the road.
Has recently failed mot on emissions.
A. Carbon monoxide content at idle exceeds default limit 4.62
B. Hydrocarbon content after 2nd fast idle exceeds default limits 2750
C. Lambda reading after 2nd idle outside specified limits.
Would appreciate any advice on what’s wrong and needs replacing etc.
Has it got anything to do with the Airflow Meter.


Belle427

9,258 posts

236 months

Friday 14th June
quotequote all
First thing you need to do is give it a good service really and add some premium fuel.
Obviously a good run then to blow out the cobwebs.
How does it seem to be running?

rickprice

492 posts

241 months

Friday 21st June
quotequote all
I had this recently.

Tried fresh fuel, good hard run, etc.

Eventually changed the distributor and rotor for better spark - garage felt one cylinder was misfiring. Inside had some surface corrosion.

Passed.

Richard

phillpot

17,184 posts

186 months

Friday 21st June
quotequote all

With no MOT a good run isn't going to happen!

Hooking up to Rovergauge might help?

blaze_away

1,531 posts

216 months

Friday 21st June
quotequote all
phillpot said:
With no MOT a good run isn't going to happen!

Hooking up to Rovergauge might help?
Good call, and if you can do that I can help analyse the data for op

Mutley00

267 posts

126 months

Friday 21st June
quotequote all
Sounds like your car needs an 'Italian Tune Up' ie a good hoon and some decent 98+fuel. How far did you drive it for the MOT? Here is a quote from the Police Website which will hopefully make your decision easier.

If your vehicle doesn't have an MOT, you can drive it to or from a pre-arranged MOT or to or from a pre-arranged appointment, to have defects remedied that were discovered on a previous test. 

I presume you dont have any 'emissions friendly' MOT stations in your area?



PabloGee

341 posts

23 months

Friday 21st June
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I wonder if that could feasibly be a petrol station?

Can you take a route you're confident has no NPR cameras?
Not necessarily a thoroughly legal option, but might be possible to fly under the radar?

mk1fan

10,591 posts

228 months

Friday 21st June
quotequote all
I agree, fresh fuel and an Italian tune up would be the first thing to try. You could get round the 'no MOT' issue by booking an MOT, fully warming the car up on the driveway (ie the cooling fan(s) kicj in and out) before heading to the testing station and asking them to carryout the emissions test straight away. If it fails, then you're stuck with getting an MOT done (which may not be a bad thing) but you do get a [potential] free retest if the fail is just emissions or emissions and a blown bulb - ie something simple. But they may let you go after the emissions if you explain matters ahead of time.

You could try fresh fuel and a long 'fast idle' on the driveway to help clean up the system. So start the car, hold the throttle open at 3000 rpm for 20-minutes. You may want to position some fans infront of the car to help move the heat away.

I would suggest using super unleaded, the higher RON the better even if you usually use regular unleaded.

Another 'simple' fix would be to fit some new spark plugs as well but appreciate the cost of these. If you usually 'trundle' along using the engine tourque then you may wish to try the next 'hotter' plug in the range. With NGK I think this would be a '6' where TVR fitted '7'. With Champion it would be a higher number (so if a '6' were fitted then a '7' would be hotter).

PabloGee

341 posts

23 months

Friday 21st June
quotequote all
Good suggestions.

It's not nice to do, but you could drain the tank in the rear wheel arch then drop some 98/99RON in from a jerry can, just to clear it out.
You can then add some Redex with a fill-up to help clear through (mostly about cleaning fuel lines and injectors).

You'e got to be able to move it to help it along, otherwise it's effectively condemned.

blaze_away

1,531 posts

216 months

Friday 21st June
quotequote all
....all good suggestions but there is no data to support those actions.

Get RoverGauge on it to see what's going on with the fueling.

mk1fan

10,591 posts

228 months

Friday 21st June
quotequote all
good suggestion but there's no data to support they have RoverGauge biglaugh

blaze_away

1,531 posts

216 months

Friday 21st June
quotequote all
mk1fan said:
good suggestion but there's no data to support they have RoverGauge biglaugh
Well yes I see your point, but it has to be said its a better bet to get hold of RoverGauge and run a logfile. It may show an issue that no amount of Italian tune ups and fuel swaps and redex shots and and and a multitude of guesses.

I have personally remotely assisted 5 individuals recently with mot emission failures all fixed and mot passed diagnosed with RoverGauge.

Just trying to help.


Edited by blaze_away on Friday 21st June 22:13

mk1fan

10,591 posts

228 months

Saturday 22nd June
quotequote all
We're all trying to help.

I would think that if the OP had RoverGauge then they would understand what is for, have plugged it in and retrieved the data before posting the thread.

Do you really think it is easier to obtain RoverGuage, equipment plus skill to use it and post up the results for casual third party analysis than it would be to get some super unleaded and give it an Italian tune up (be it on the drive or on the way to an MOT test)? While I admit it isn't my field of expertise, I would have thought any data gathered on a car running on [potentially] duff fuel would be heavily compromised / give eroneous readings.

So getting some fresh fuel in the car would seem to be a neccessity anyway.

I also note that you have helped a number of forum members recently - I haven't suggested that this isn't a nice thing to do, or unproductive, or that members shouldn't take you up on this offer.

It would appear though, in my opinion, that there are some bits that need to be done (fresh fuel and getting it thoroughly warmed up) anyway before running RoverGuage so why not just do them and see if it resolves matters.

Thats not to say there are lots of things wrong with the car anyway.

blaze_away

1,531 posts

216 months

Sunday 23rd June
quotequote all
mk1fan said:
We're all trying to help.

I would think that if the OP had RoverGauge then they would understand what is for, have plugged it in and retrieved the data before posting the thread.

Do you really think it is easier to obtain RoverGuage, equipment plus skill to use it and post up the results for casual third party analysis than it would be to get some super unleaded and give it an Italian tune up (be it on the drive or on the way to an MOT test)? While I admit it isn't my field of expertise, I would have thought any data gathered on a car running on [potentially] duff fuel would be heavily compromised / give eroneous readings.

So getting some fresh fuel in the car would seem to be a neccessity anyway.

I also note that you have helped a number of forum members recently - I haven't suggested that this isn't a nice thing to do, or unproductive, or that members shouldn't take you up on this offer.

It would appear though, in my opinion, that there are some bits that need to be done (fresh fuel and getting it thoroughly warmed up) anyway before running RoverGuage so why not just do them and see if it resolves matters.

Thats not to say there are lots of things wrong with the car anyway.
I am not wasting my time on you. Go troll someone who gives a toss

Loubaruch

1,219 posts

201 months

Sunday 23rd June
quotequote all
blaze_away said:
I am not wasting my time on you. Go troll someone who gives a toss
Take no notice!

Many on here are very appreciative Blaze_away of your efforts to pinpoint actual faults and from reading the post it would semm to me that something more serious than replacing the fuel or tearing around the block is going to cure things.

When I take my standard Griffith 500 for MOT the tester always remarks how low the emissions are he adds they are much lower than 3 year old moden cars in for test. The CO is so low it does not even register on his equipment.

Suggesting quick fixes for serious problems may not always prove helpful, if the problems are not tackled logically as you do when looking at the logfile can waste an awful lot of time and money chasing ones tail. Keep up the good work!

spitfire4v8

4,013 posts

184 months

Sunday 23rd June
quotequote all
Rovergauge is excellent and I would well advise anyone to get a copy and familiarise themselves with it just in case.

Looking at the emissions readings I wouldn't be taking anyone's advice of the italian tune up. You very obviously have something seriously amiss if your HC value is 2750! that's bonkers high. as is the CO .. do you even have any cats fitted? Hint .. a catted car in good condition will have values close to zero for both those readings...

Do yourself a big favour and get it trailered to your specialist of choice, who hopefully will go through a proper diagnosis proceedure rather than just taking it for a thrash and potentially causing havoc with your already poorly engine.

Also 3 years without really doing anything ? Get those fuel pipes checked if they weren't changed before then for some good quality replacements.

blaze_away

1,531 posts

216 months

Sunday 23rd June
quotequote all
Loubaruch said:
Take no notice!

Many on here are very appreciative Blaze_away of your efforts to pinpoint actual faults and from reading the post it would semm to me that something more serious than replacing the fuel or tearing around the block is going to cure things.

When I take my standard Griffith 500 for MOT the tester always remarks how low the emissions are he adds they are much lower than 3 year old moden cars in for test. The CO is so low it does not even register on his equipment.

Suggesting quick fixes for serious problems may not always prove helpful, if the problems are not tackled logically as you do when looking at the logfile can waste an awful lot of time and money chasing ones tail. Keep up the good work!
Thanks for the support, much appreciated, and for sure, crap like that is water off a ducks back. I'll keep helping with hard data to any that want it. If they don't then jog on by.

Cheers

mk1fan

10,591 posts

228 months

Sunday 23rd June
quotequote all
blaze_away said:
I am not wasting my time on you. Go troll someone who gives a toss
I'm not trolling you. Merely pointing out that it is worth doing the bits they are going to need to do anyway to gather information from RoverGuage.

I haven't dismissed or belittled your suggestions or the works you have done for others. Anyone suggesting, implying or saying I have has very clearly not read my posts and is being dishonest.

blaze_away

1,531 posts

216 months

Sunday 23rd June
quotequote all
So you didn't post this sparky comment on another thread ?

mk1fan said:
Well apparantly the ONLY thing you can do at these days is plug in RoverGuage and submit the data files to blaze_away for analysis biglaugh

If your AFM is duff, possible chance to upgrade to the larger 'Jag' version!?!

Edited by mk1fan on Saturday 22 June 15:46

mk1fan

10,591 posts

228 months

Monday 24th June
quotequote all
Yes, I did post that on another RV8 running badly thread. The laughing emoji at the end of the sentence clearly shows no malicious intent. Although, highly accurate in your opinion judging by your comments on this thread.

Again, I haven't said people shouldn't run RoverGuage or mocked your assistance of others.

Anyway, back to the point of this thread ..