For some time now my car has had an erratic idle. A few ideas that people have given me is that it could be a clogged filter, bad fuel pump, or a bad fuel pressure regulator. Recently though I was able to rule out all three since I changed the filter, and checked the pressure on the fuel rail with a tester, which for my 1993 Buick Lesabre has to be from 41-47 psi with the ignition ON. Mine was at 43 psi. Then, I read online that erratic idling could also be caused by an electric component like bad spark plugs, bad spark plug wires,
or bad ignition coil packs. So two days ago I changed the spark plugs and the wires, and although at first I didn't notice any major difference, now the idling is 10 times worse. As soon as I turn the engine on, the whole car starts shaking sharply. After a little while it will start accelerating on its own like of I was stepping on the gas, then the accelerating stops, and after about a minute or so, it does it again. So. Im guessing that this stronger erratic idling had to be caused by the changing of the spark plugs and the wires but I don't know how. I made sure that the wires were connected in the right order several times. One thing I noticed though is that after I tightened the new spark plugs and plugged the wires on them, I could see a small piece of the white ceramic on the spark plugs, and Im not sure if I was able to see them before. I thought the whole spark plug had to end up covered completely by the wire. Is this a problem? And if it's not what else could be causing this? One thing I haven't tried is changing the ignition coil packs. Should that be my next attempt? Thanks in advance I really need some advice.
have the same problem?
Tuesday, September 29th, 2015 AT 9:21 PM