I have a very annoying, ongoing problem with my GSi. It happens every now and then, causing me much embarassment, really. I just want my car to work how it should!
Driving along, any speed, any revs, any engine temp. Nothing seems to be wrong with engine, no signs that anything bad is going to happen. Then >
*Engine warning light on dash comes on
If I take the car out of gear, into neutral, the idle becomes really erratic, engine becomes spluttery, revs drop fast and engine stalls. If I keep the car in gear and continue driving, the engine seems like it's running fine until I take it out of gear.
Once the engine stalls, it can be hard to start for a few times. Sometimes starting the engine will clear the problem, other times I'll have to turn her off again (or let her stall herself) and try starting again (and again, and again).
I have noticed, when the problem is happening, if I drive her hard for a bit, trying to keep the revs as high as I can, when I ease off again, she will be OK. Engine power dies off too if I keep her in gear and try to keep driving.
I've taken her to Holden 3 times. When they plug her into the diagnostics machine, it reads an error with the EGR valve (while the problem was happening - the first time it happened to me, it wouldn't stop and I had to have her towed to the dealer where they plugged her in while it was happening). If they plug her in at a time when she seems OK, it reads nothing and nothing in the ECU's memory. I'm currently on my 3rd EGR valve, and it's STILL HAPPENING. Obviously the Holden guys I've taken it to have got no idea.
The last time it happened, was when I put her back into 3rd gear and gave her a bit (about 4500-5000rpm). I looked out my rear view mirror and saw alot of black smoke coming out, then the light came on and the problem occured.
There doesn't seem to be anything wrong that would hint to what the problem is. I have noticed though, when I slow down at a set of lights and take her out of gear, the idle (usually sits around 750rpm) will stick at 1000rpm for a second or two, then fade down to normal.
What could it be guys? I've been told it could be the idle control valve? Could this be it? Any other suggestions? Computer? Something ELSE to do with the EGR valve? I'm not really that crash hot when it comes to engine tech. I've been told by the guys on Corsasport that if anyone can help me, it's you guys. I hope so dudes! Please help me!
The black smoke means your running rich and if it only occurs after giving it a hiding then mayb it is the O2 Sensor since it is one of the sensors that determines mixture. Also, check the fuel System ie Pump, regulator and also pressure and filter.
I'd start by checking the idle control valve and pipework.
Strip it out of the car and give it a good blast of carb cleaned until it's all clean, then a quick squirt of oil on any moving parts you can see. It might be worth wiring it up to a 12 volt supply and checking it's opening and closing OK.
Check all the pipework to make sure there are no cracks, holes or blockages.
Disconnect the battery and leave it overnight to clear the memory in the ECU (usually takes about half an hour, but overnight's better just to be completely sure).
Then start it without touching the gas pedal and leave it to idle until it settles down completely.
If it's still happening after that bump this thread and we'll have another go at it.
Idle valve is down near the egr valve, i've had a similar prob with my old x16xe. Ended up removing the egr valve, cleaning it out & refitting it with a blanking plate between it & the inlet manifold. cos the valve needs to be plugged in 2 keep the em light out. It worked really well & gained a bit power on the rollers!!