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Discussion Starter · #1 ·
Hello,

I have a MGF VVC 2000 on a 'w' plate. Since i purchased the car the revs have had a mind of their own, fluctuating from normal idle (about 850 ish) to 1800. This problem can happen at any time but more likely when hot. I have had the car checked by a Rover dealer twice now, and they say that they cannot find any problem. If i restart the engine this sometimes sorts the problem and sometimes I can force the revs down by letting out the clutch whilst stationery. I have checked the throttle body and it was the metal type, although I have now changed this to a 52mm version, (purchased from Mike Satur). This has made no difference. I have also installed a cold air induction kit, not to help my problem, just for the sake of performance. Does anybody have any ideas please?

Adam D
 

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mg_zs
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Give this a try, spray the linkage to the throttle body with wd40 where the accelerator cable attaches to the linkage and springs they get dirt and dust sticking there and a generous spray of wd40 can do the trick sometimes (8_10 secs good soaking close up) you can test it by pressing the spring loaded linkage while the engine is running and when you have sprayed it moving it manualy will help to free it up.

IVAN
 

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Discussion Starter · #5 ·
i have now had this problem resolved by Brown and Gammons, a specialist MG dealer in Herts. The problem has been a faulty engine wiring loom. When in the garage connected the car to the 'test book' everthing looks ok until you move the loom from side to side and then the engine displays all of the problems with the eratic idle. A new loom is about £500 plus £160 for fitting, but if I can find a second hand one they are happy to fit it. If anybody has this part then please contact me at [email protected].

Thanks and I hope that this helps someone
 

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this problem occurs when you disconnect the throttle pot, might be worth trying to narrow it down a bit, i'd start there.


The one on the throttlebody in between the 2 hoses

dosconnect it when its doing it, if there is no change then youve found the problem

Col
 

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I had the same problem with my mgf last year. The mechanic said that the injector wires was heating up and touching each other. (Quite hard to explain/imagine). But he fixed mine by replacing 2 of the wires and making more space between each other. And it seemed to have fixes the problem.
 
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