I just had a 3.8L V6 motor (Jasper rebuild) put in my 2000 Chevy Impala. After new plugs, plug wires, and cleaning the injectors. I am still plauged with a misfire on cylinder 6. Cylinder 3 was the only one misfiring initially, new plugs fixed that. But I still had a rough idle that wouldn't go away for the first couple of minutes after starting (I would hear what sounded like water passing through the heater coil at about the same time the idle would smooth out). So my mechanic put the coolant system under vacuum to make sure there were no air pockets, but the problem still persisted. Then Cylinder 5 and 6 started acting up about 2 weeks later. Still having the rough idle, but now it is cutting out when I accelerate and getting worse, with the check engine light coming on, also occasionaly hearing a small "pop" under the hood while it is cutting out. The error(s) it reads on the meter are misfires. It was cylinders 5 and 6 that self destructed on my other motor with only 90k.
2007-04-06 05:59:38 · 5 answers · asked by nospoon1117 1 in Cars & Transportation ➔ Maintenance & Repairs
To start with, find a new mechanic. You don't put cooling systems under vacuum to get air out. And it does sound like you have air in the system. Whoever put the Jasper in screwed up. You don't release a car with a new engine when it's not working right. Getting the injection and ignition right is part of the job.
2007-04-06 10:32:01 · answer #1 · answered by Nomadd 7 · 0⤊ 0⤋
The plastic intake manifolds used on the engines were known to be prone to cracking...could be a leak. Get out the water hose...when the engine is cold, start it...and start spraying. If the idle briefly improves when you've covered the manifold around #6, you've found your leak...Careful you don't do too much...if it is leaking, you could put a rather large amount of water into the cylinder--never a good thing.
2007-04-06 08:12:14 · answer #2 · answered by Galaxie500XL 5 · 0⤊ 0⤋
Have you checked the coil packs, should have 3, they are bad about going out, or you might have some bad injectors...do this...crank the car in the pitch dark, look at the coils, wires, and see if you see sparks, if so there's you skip...If none found, then get a computer scan ran.
2016-05-18 21:35:58 · answer #3 · answered by ? 3 · 0⤊ 0⤋
sounds like the coil and ignition module might be bad i would check them before i got into to much, if you have a bad ing mod that can cause all kinds of trouble and even make your coils mess up i would check that first.
2007-04-06 07:57:57 · answer #4 · answered by handyman 4 · 0⤊ 0⤋
possibly you have a bad coil or ignition module. You may also want to check the crank sensor or look for flash updates for the computer.
good luck
2007-04-06 06:07:54 · answer #5 · answered by Anonymous · 1⤊ 0⤋