1992 Pontiac Grand Am

Make sure you check the coil boot. If it looks bad then get new coil boots and replace them. Look for any signs of burning or cracks and also look for any carbon tracking on the coil pack the coil pack housing maybe allowing the spark to get to ground before getting to the plug. Let me know what you find.

Do as I have instructed and let me know what you find.

As I have previously indicated, I replaced the coil pack and no change, cylinder still does not fire. Checked spark on that cylinder, appears to be ok.; Only thing I can think of is a stuck open intake valve. Would the next step be a compression test.

Ok check compression in that cylinder and see what it is. It could still be an injector not firing so that we will check next. Let me know what the compression is so we can rule that out. After that we will check the number 3 cyl. injector ok. Get back to me.

As I have previously stated, I check the injector, cleaned all injectors and switched injector on problem cylinder, check spark to that cylinder, everything was OK, yet when I disconnect current to the injector, engine runs the same, so that cylinder is not firing. Next step will be to do a compression test if I can find a proper gage.

When I do that I will contact you. This is a good example of just how much at risk a vehicle with fuel injection can place a person in when things go wrong. Can not be repaired on the spot like a non-fuel injection vehicle can. Need to think about finding a vehicle that will be dependable in the bush.

What surprises me is that when at high rpm like when passing, the engine seems quite normal, like that cylinder kicks in.

Thanks for the help.

Walter

Well that can happen as the rpm increased you are less likely to feel it if it is a bad injector. If you need to get a noid light that fits you car (GM Type) and do a noid light test to make sure the pulse is there as it should be. If you need anything else just ask.