TF 135 uneven idle... but not really...? - MG-Rover.org Forums
 
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post #1 of 14 (permalink) Old 12-05-2017, 18:27 Thread Starter
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TF 135 uneven idle... but not really...?

Good evening all,

Wonder if I may ask for a little advice.

My 53 plate 135 seems to 'feel' lumpy when idling, but not particularly badly.

I have replaced the spark plugs for brand new denso iridium's and also the HT leads for magnicor's.

Still the same.

I have reset the iacv, no different.

The rev counter doesn't seem to move at all at idle, holding steady at maybe 900rpm which seems to be right from videos I've looked at.

The car does seem to smell strongly of petrol when standing still, so guess this is related.

The head gasket was done in January along with the cam belt by a local MG specialist so assume these are ok and the timing is correct.

It runs cleanly enough at speed and I don't seem to get bad economy out of it considering the mainly town driving I do (approx 350 miles out of the last tank).

I can sort of more 'feel' the unevenness through the seat and you can see the rear view mirror wobble.

Any thoughts?

Could it be coil packs? Could it be a sensor? Could it be something totally different like engine mounts?
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post #2 of 14 (permalink) Old 12-05-2017, 18:27 Thread Starter
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Oh, I hooked up a OBD2 reader and got no faults...
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post #3 of 14 (permalink) Old 12-05-2017, 20:27
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rear view mirrors always wobble...but less with an hard top fitted. It is likely not engine related, could be suspension/wheel bearing/bush/ball joints which are the issue.

My F just past its MOT, all good, but to me it doesn't quite feel right compared to my TF, don't know what it is, though engine, thought wheel bearings, probably just me used to the TF
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post #4 of 14 (permalink) Old 12-05-2017, 20:37
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Perhaps the IACV needs to be cleaned/replaced rather than just reset?
Any possible perished, loose or leaking air hoses around that area?
You seem to have covered the usual other suspects!
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post #5 of 14 (permalink) Old 13-05-2017, 05:21
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Start investigating that Petrol smell immediately, otherwise you could have far bigger problems than a slightly lumpy idle...

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post #6 of 14 (permalink) Old 13-05-2017, 09:10 Thread Starter
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I assume you believe there to be a fuel leak?

I thought there couldn't be because of the mileage I'm getting.

I wondered if it was an injector but reading up on different forums, it seems the consensus is that injectors really go wrong.
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post #7 of 14 (permalink) Old 13-05-2017, 09:12 Thread Starter
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I was going to get a tin of carb cleaner and have a go round with that and see if I can pin point any vacuum leaks etc.

It's just getting round to it! Its not a 5 minute job when you have to get the engine cover off!
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post #8 of 14 (permalink) Old 13-05-2017, 09:36
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The fuel smell will more than likely be un-burnt fuel, see if there is anything coming from the tailpipes. Sounds like an ignition/throttle problem.
Had a similar fault last week and a TPS reset cured it, but had to leave the car to stand half an hour to let the un-burnt fuel go before it ran ok again, in fact it has happened three times in the last couple of months, so maybe time for a new throttle sensor.


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post #9 of 14 (permalink) Old 13-05-2017, 09:58
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Quote:
Originally Posted by Mike View Post
I assume you believe there to be a fuel leak?
I dont assume anything with cars these days.

There is only one way to find out I am afraid.

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post #10 of 14 (permalink) Old 14-05-2017, 14:22
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The 135s are a little lumpy due to the cam profile anyway and this can be improved with remaps.

Have a look at the long & short term fuel trims. See if the car is adding more fuel or trying to remove it. Adding it in might hint at a dodgy o2 sensor giving false readings, if the car is trying to remove it but still too rich then perhaps injectors or something blocking the air ways?

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post #11 of 14 (permalink) Old 14-05-2017, 20:37
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I too have this problem but I get a faint smell of fuel on large throttle openings. Fuel economy is ok but the nearside exhaust tip is black inside. Smells a bit rich at idle but how do I adjust this?
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post #12 of 14 (permalink) Old 15-05-2017, 07:29 Thread Starter
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I think I might just throw a new iacv and throttle sensor at it and see if that helps.

It's just strange because to me, it runs really cleanly above idle, bit at idle it seems lumpy and rich running.

I think saying it's lumpy is probably a little unfair in all honesty. You can here a little variation in the otherwise smooth sounding engine, as I say the rev counter doesn't budge.

You can sort of feel it more, almost like a balance issue.

It's just the smell of petrol that suggests to me it's an ignition type problem, like maybe every now and then one cylinder isn't firing.

Oh go on then! I'll do the coil packs too!

Why does everything on these cars cost a fortune!

You go to do one small job and end up spending a mint!
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post #13 of 14 (permalink) Old 15-05-2017, 09:44
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When I got my 135 a few years ago , when he seller brought it round it was running a bit lumpily which I mentioned to him but I got the usual "its always been like that, and they all do it" reply.

I wasn't really happy with it although otherwise the engine was fine and as I got the car to fiddle with rather than use as a comuter vehicle , I did fiddle.
I tried to clean the IAC valve but wasn't convinced I had been very thorough so I bought a new OE one, not a pattern part, fitted it, did a reset and the idle has been fine since.

Since then I have changed the coil packs and plugs just so I know it has been done and can't do any harm, and the idle when warm is still stable.

As said, it can't do any harm to change these things and may well solve your problem with the idle...unless the fuel smell is indicative of some other less apparent fault which is causing the bad idle.

Good luck with it!
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post #14 of 14 (permalink) Old 15-05-2017, 21:31
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you are preying on your own assumption.. just because you think an mgf engine should have a fault free, clockwork regular idle.. , and some do.. and some dont.. some do all the time.. some do some of the time..

its not about the general setting.. its about the moment setting... like the tick of a clock being on time or off time.. and because the moment is in change... there is no set time.. its the moment..

and the reaction is in constant change,, the ecu is directing the moment , but cant see all affecting things... and if it cant... it dont matter what program it uses, or what sensors its using.. to determine its reaction.. it dont see all..

AND.. if it dont see all, all of the time? time beats it...and what happens is ? you dont think it sounds right...

tell that to an engine designer. " sorry mate.. it dont sound right to me "

he - or she might have spent a whole life and effort to hear you say that..
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