Erratic idling

[Tim beard]

Mornin guys , I have a intermittent engine fault , sometimes Idols high , and sometime holds the rev high inbetween gear change , and then runs perfect then it plays around , any ideas where to start looking
,many thanks tim

 

[Ianmc]

I'd check your throttle cable, if your car has one of course.

 

[Antm72]

I would also check your rubber inlet after the Maf for any splits letting in unmetered air.

 

[Tim beard]

I have put new rubbe on after mad sensor when first bought the car , but will check again
, I am sure it does have a cable , a couple of people have said that , if cable was faulty wouldn't it be doing it all the time , tim

 

[GazHyde]

Have you got a code reader Tim? Might be something obvious showing code wise...

 

[Tim beard]

Yes done that , only showed abs senor which I have ordered , it drives absolutely perfect then for a few days it plays about , it's not undrivable , I would just like it right

 

[littlefeller]

could it be the speed sensor? i have noticed on mine that if im rolling forward in traffic the idle wont drop to the usual untill the car is at a standstill - rolling rpm around 1000-rpm then at standstill it drops to around 800rpm

 

[Tim beard]

Have had another throttle body with a sensor on it would that been the same one

 

[lucky jim]

hi for what its worth i had intermittent starting & idling changed cam senors ( on ebay £10 each ) 20 min job now runs sweet as a nut.

 

[Tim beard]

Ok thanks , a friend of mine is a very good mechanic , where the speedo is jumping up and down fluctuating all over the place , he is sure that it is speed sensor on the gear box , so have for one to try

 

[lucky jim]

hi again if you look on utube you can do a check on all dials by pressing odometer & switching on & off

 

[Tim beard]

Ok thanks will look into that , thanks again all help is welcome , tim

 

[littlefeller]

Ok thanks , a friend of mine is a very good mechanic , where the speedo is jumping up and down fluctuating all over the place , he is sure that it is speed sensor on the gear box , so have for one to try

this may explain the idle issue, was the sensor ok before the build?

 

[Tim beard]

Not really sure as bought the car just for the cobra kit , it ran well so I took it apart , I am sure it's a new problem

 

[mrscalex]

An identical problem was caused by a sticking throttle cable on my brother's 1.9. It had been off the road for 2 years. It soon cleared itself with use.