Idle Problems

[DamoM]

having tried pretty much everything to get to the bottom of my idle problems I though I would give it one more go. I tried disconnecting the ISV and lo and behold the car idled - albeit a little high at 900 rpm.

Does anyone know the ramifications of running the car with this disconnected? I have tried another ISV previoulsy and the problem persisted.

[jameswkr]

If by "ramifications" you mean harm to the engine, I do not believe so. However having driven my S2 with it disconnected, the car was unpleasant to drive - jerky and hesitant off/near idle . Try removing the ISV and give it a good clean ( there are lots of threads on this ). Lube with the mineral oil from the PS system.

[DamoM]

If by "ramifications" you mean harm to the engine, I do not believe so. However having driven my S2 with it disconnected, the car was unpleasant to drive - jerky and hesitant off/near idle . Try removing the ISV and give it a good clean ( there are lots of threads on this ). Lube with the mineral oil from the PS system.

I know what you mean, mine is a little like that now you come to mention it but it is a whole lot better than the stalling!

I actually have tried swapping the ISV with another one which I know to be working but it had the same result. previously I have had problems with diverter valves leaking air but this time it is rough even with the diverter valve taken out of the loop.

[A80Avant]

have you cleaned the throttle body potensiometer?if ISV is ok then that could be a problem.give it a good cleaning

[DamoM]

have you cleaned the throttle body potensiometer?if ISV is ok then that could be a problem.give it a good cleaning

Actually changed it for a new one!!

[kalsket]

I'm problem with RS2 idle too. Tried cleaning, another isv and checked TPS, No cure.

Problem is that sometimes it works fine and idle starts around 1500 rpm and slowly degrades to arounr 900. Usually it drops to 5-600 before it humps up and gets stabilazed, sometimes it drops dead and somtimes keeps humping bit longer...

[maRS2]

I've got same problem on my RS2

some time 1200 rpm sometime 5-600 rpm and it hapened specialy after WOT
I clean Isv and throtle body check that Isv working good and have a new TPS.

It also hapened when changing altitude (going up mountain) so maybe it's related to the atmosphere pressure sensor

What is strange is that when idling wrong if i give it a quick rev it comes back to normal

[WabTheKing]

Actually changed it for a new one!!

there is adustment on them, if there not adujsted right on the slots then they idel *****

i took mine off cleaned all my TB put it all backtogether and had a similar problem

when you operate the TPS theres a little click when its on its idel postion, if it dosent click when your TB is closed thats when it can do this

loosen the two screws and rotate it round abit untill you have the click when you shut the TB

regards
will

[maRS2]

I check the click on TPS it's perfect adjusted.
But still have this problem

[A80Avant]

could it be a MAF problem?or a temperature sensor problem?
I mean the MAF could be reading the air flow wrongly and have problems with the idle.Have you pulled any codes?

[DamoM]

checked the TPS and the switch is activated on closed throttle.

The MAF has been swapped out with another one from a working car (that idles ok!).

Put a new temp sensor in but no change.

I have run all of the checks on all sensors, including altitude sensor etc.

[WabTheKing]

might sound stupid but have you checked the wire/plug?
i had a problem with the temp sensor on the back of the block for the cold starting,

changed it for a new one still had the prob, checked for a voltage - nout

checked all the fuses/releys everything, problem was the wire had broken in the plug.