Engine hunting

[Danvr6paddy 0]

So been a busy boy changing stuff . So far i have cleaned throttle body changed plugs bought new leads repaired pcv pipe and my car is still hunting . Did not no if it was down to cheap prospark ht leads as the old ones were gone anyways i not notice a diffrence maybe a tiny bit worse since i put these leads on but this is my second set in 2 months

[cactusjackslade 146]

9 times out 10 I find hunting to be down to air leaks.. Have you checked vacuumed lines and inlet manifold gaskets for air leaks?

[Ickyketseddie 89]

Exactly my thoughts ^^^^

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[Danvr6paddy 0]

I done rocker cover gasket last week and replaced the manifold gasket as well . Just seems worse since i done the leads . I put old ones on tomorrow see what thats like . And i done spark plugs

[Danvr6paddy 0]

Right its not hunting now i sorted leads out but i can feel it lumpy hmmmm

[Ickyketseddie 89]

Coil pack?

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[wardycatt 7]

^^^^^ Coil pack  ^^^^^

 

A few other quick suggestions (before the boss nabs me for skiving):

 

* check the PCV again. If the small vacuum line connected to that is split or loose then you can get a lumpy idle.

 

* check the MAF - unplug it and see what happens. If no change to lumpiness when you remove and/or re-insert it, you may have your culprit. 

 

* give the cam sensor a clean as well - once you have the coil pack off, it would be rude not to :-)

 

 

It sounds like you've covered a few other likely culprits, e.g. leads and plugs. 

 

And whilst we're at it, how's the health of your battery?

 

 

...in case you hadn't guessed, I think it's electrical.