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1992Buick Lesabre
11-03-2012, 06:37 PM
Post: #1
1992Buick Lesabre
Rough idle when engine is cold. Bucks and hesitates on acceleration. When engine is warm runs smooth but gas mileage has decreased. No vacuum leaks. Wires, plugs, ignition coils, crank shaft position sensor, oxygen sensor and coolant temperature sensor have been replaced. There are no fault codes. HELP!
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11-03-2012, 08:45 PM
Post: #2
RE: 1992Buick Lesabre
I'd be looking at fuel delivery first. Try replacing the filter and if that doesn't solve it then check the fuel pressure.

Next, you may not have a vac leak but old vac lines can "suck down" when the engine runs. IOW, you may have one that is playing games on you. A soft line going to the MAP sensor could do that hesitation bit.

Keep us posted and maybe we can find a soultion together.
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