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3.0 V6 406 rough idle

I have a 3.0 V6 and have been trying to chase down why it would not idle smoothly, it intermittently (every ~10 seconds) fluctuates by about +/-

300rpm. I have changed: Idle control Valve, Throttle potentiometer, Coil pack, HT leads, Spark plugs, Lambda sensor, MAF sensor, Inlet manifold gaskets.

I also have my own Code reader that I can view the log files with and nothing is coming up at all over 3 months (must be a record in its self). Does anyone know what might cause a this intermittent bad idling and stalling when steering, parking and edging in traffic? Sometimes misfires for the first 5 seconds in the morning as well and does appear to be worst when the car is facing down hill. Performs just fine through the rev range. Temperature makes no difference but it does like damp mornings.

Regards Gary

Reply to
G Cadman
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Dos this car tick over when warm? try reseating the coil pack make sure it is very clean under it.if you hold revs at 2000 rpm dos it hold or dos it miss fire? tappet setting? good luck from chris Addlestone Surrey

Reply to
Chris

Have you tried a dose of injector cleaner jollop? Our 306XT can be difficult to start (needs full throttle) when facing uphill which I put down to leaking injectors flooding the thing. If yours is similarly gradient sensitive it's more likely to be something like this than the coil pack. Cars always run better when the air is damp because it is denser then.

Ron Robinson

Reply to
R.N. Robinson

Thanks for your input.

The car does tick over when warm but the problem is still there. It will also stall once warm. If you hold it at say 2500rpm the rev range wanders by the same amount. It is as if a sensor is trying to incorrectly compensate for something.

G.

Reply to
G Cadman

John,

The only thing I can think of is that this might be the change over beween idle and mid on the throttle potentiometer. You could check it out by disconnecting it, the ECU will do it's best to compensate but it will not be able to tell either way, hence bypassing it.

Regards Gary

Reply to
G Cadman

thanks for that Gary, I will give it a try, best wishes John

Reply to
jb

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