Question about 2001 Buick LeSabre
Upon star-up the engine idles very rough and sometimes has power surges. This happens after sitting over night or for only one hour. The engine coughs and hesitates, trying to obtain full power during the first 1/4 mile or less and will then start running smoothly. There is no engine service light showing and the local mechanic says the computer shows no problem. I disconnected / reconnected the battery cables which eliminated the problem for a week. Now upon start-up I can switch off and immediately restart the engine and it runs fine.
My 1997 lesabre has developed the same problem. I replaced plugs,wires,pcv valve and O2 sensor to no avail. Also tried several tanks of high octane. Yesterday I left the store and it wouldn't start at all. Had the car towed to a good local shop. Today they said it starts fine and has been all day! They checked everything they could think of and can find nothing wrong. The head mechanic suspects the crank sensor but said it should give a check engine lite if it was having a problem. Of course the third time I started it after picking it up the damn thing barely ran for a minute or so before finally smoothing out. No check eng lite. This is becoming very frustrating!
Posted on Sep 28, 2008
Comment to Guesttoo:
These are not the same automobiles. I don't know who posted the first problem, but I posted the second one and this is the only time I have posted a problem.
I will update you on my problem. A friend who had the same problem said his was caused by using gas with Ethenol. (Ethenol causes water in the gas tank). He switched to a gas without it and after a couple of tanks the problem stopped. I am on my second fill up with gasoline without Ethenol, but so far, my problem is no better.
Posted on Sep 15, 2008
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