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My NC Fairlane starts easy enough but I have to hold 1500 to 2000 revs for a few seconds before it will idle, after that it behaves perfectly normally. The vehicle is dual fuel and behaves exactly the same with gas or petrol. Any ideas.
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Hello Peter. Is it a 6 or a V8 NC?
If it's a 6 I would be checking firstly the vacuum hose going to the MAP sensor.
Secord thing is if you climb underneath the car you will see a plastic "F" piece (vacuum tree) on the inlet manifold plenum quite close to the oil filter but on the manifold. These can split and cause a vacuum leak. The split can be patched with silicone but the last one of those that I bought cost me about $3 from a Ford dealer.
Next thing (6 or 8) would be to unbolt the IAC from the throttle body and squirt some carby cleaner through it's passages. After that if it's a 6 would be replace the MAP sensor.
HTH, Jim..
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Rank: Member
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HI jim, thanks, the car is a v8,I will follow up on your information.
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Rank: Member
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Hi Jim, thanks again for your reply to my starting problems, I am only a very amateur mechanic but, I have hunted around for any possible vacuum leaks without success, I have asked my usual mechanic to investigate a couple of times but he seems loathe to take it to far incase it becomes a very expensive issue.
Thanks again
Peter.
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Rank: Veteran
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Actually the airflow meters on the V8's are a fairly common cause of bad idle but yours comes good after a few seconds which is strange.
If you can get a cheap known good second hand AFM it might be worth trying.
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