video...need help

[///M42 sport]

This happened suddenly the other day. The engine suddenly has irratic idle and cuts off unless I keep the revs up.

I checked hoses (replaced last summer)

video

http://www.youtube.com/watch?v=NP8ICRDqEXY

http://www.youtube.com/watch?v=zXSTeOm2uZE

[coolasacuc]

have u tested your spark at the wire-plug point.

you dont have an erratic idle... you dont have an idle at all. However, the motor like running when you demand more fuel and vaccume.

start with your basic 4 (engine cycles) Intake, Fuel, Spark, Exhaust

your motor isnt getting enough of or too much of one of those things to stay at it lowest operating speed.

or FPR, TPS,

[///M42 sport]

Ok, thanks. I forgot to include, I replaced the idle control valve with a new unit, but no change. What would most likely to happen suddenly?

[coolasacuc]

things that can cause sudden changes... fuses i guess. any fuses/relays related to idle air control, fuel etc

[///M42 sport]

Well, I checkd the fuses. they were fine. Then I decided to ride the idle until the engine warmed. Once it was warm, the engine ran w/o shutting off and stayed pretty stable at 6-700 idle. Sounds a little rough still. I restarted w the engine warm...still would not stay running w/o riding the idle ???

I don't think there is a vacuum leak b/c all hoses replaced last summer. I sprayed brake cleaner on the hoses and did not notice any increase on the idle.

Anymore ideas?

[dude8383]

Similar thing happened to me when I had my M42. I was driving and as I was pulling up to a light the car started to sputter like crazy. Wouldn't hold idle either.

The fix was a spare ECU that I had...see if can swap out with someone.

How old are the sparks and wires?

[AndrewBird]

I don't think there is a vacuum leak b/c all hoses replaced last summer. I sprayed brake cleaner on the hoses and did not notice any increase on the idle.

That doesn't mean you don't have a vacuum leak. I'd still check everything. Start by pulling the intake boot off and looking at that. Tears inside the folds can be hard to see while it is on the car.

The fact it ran better when warm makes me think cold start valve or temperature sensor.

[///M42 sport]

I ended up getting it to drive by just letting the car run for a couple of minutes and driving it around the block. The idle is improved and pretty stable now, but still not as responsive. Now I think its a exhaust leak.

http://www.youtube.com/watch?v=FBv5pGmJoDQ

check out the middle of the this video

http://www.youtube.com/watch?v=apdXxN8poOg

http://www.youtube.com/watch?v=9ax_XvoYDqk