Engine Idle Problems

[markys]

Over the past few days my 4.2 has started to have a bit of an erratic idle, seems to bounce around a bit also MPG seems to have fallen a bit and also have a bit of 'bunny hopping' when pulling away and also seems to pop and bang at lower revs. Any ideas, I have the ECU program and can have a look at the sensors and data, anything in particular I should concentrate on ?

[pilmar]

I've had very similar problems the past few days and I've just put it down to the cold weather. She runs fine when travelling it's just on idle / traffic crawling when the smoothness disapears.

[kojak]

Throttle pots
Lambda sensors
HT Leads
Water in ECU
Cracked coil

[James45LW]

Sorry to hijack your thread but I've got an idling problem to. Sometimes it's ok and other times it (4.5) just wants to stall - and I can't predict when it's going to do either but if pushed I'd say it was slightly better when cold! I've search the previous 'stalling threads' but didn't find a definitive answer (maybe there isn't one?). At the moment I'm having to hit the brake and the accelerator at the same time as I put the clutch down. Absolutely fine otherwise.

[micky g]

me too! It seems to be an intermittent problem that crops up every now and then, then go's away. Mine hadn't done this for a month or so then bugger me started doing it today! I'd love to know what the hell causes it.

[RUSSELLM]

James45LW said:

Sorry to hijack your thread but I've got an idling problem to. Sometimes it's ok and other times it (4.5) just wants to stall - and I can't predict when it's going to do either but if pushed I'd say it was slightly better when cold! I've search the previous 'stalling threads' but didn't find a definitive answer (maybe there isn't one?). At the moment I'm having to hit the brake and the accelerator at the same time as I put the clutch down. Absolutely fine otherwise.

After I had my engine out recently, mine came back with the same problem. Turned out to be a loose nut, where the throttle arm came to rest against the idle stop. hope yours is as easy to fix

[trooperiziz]

Mine is doing it too at the moment!
Stalled it for the first time in months this morning...

[markys]

Seems a bit better this morning but still poping alot and below 2,000 rpm alot. Might have another hole in the manifold again.