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#1
08-03-2009, 08:19 PM
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Car bogs or dies when accelerating. I can't figure it out!!!
When pushing on the gas, the car bogs down, or dies. If you get up to speed slow, its fine. Giving it constent gas, its also fine. But if you let off the gas, and push it again, it starts over. I have changed
Fuel pump Fuel filter Fuel injectors MAP sensor Air filter O2 sensor Throttle control piston and sensor My brother changed the comp and a couple other sensors. Can't remember the ones he changed. I also changed the spark plugs and wire. I have no idea what to do now. I have had a couple of mechnics also look at it. They didn't know. The car is a 1990 Pontiac Grand Prix SE, with a 3.1T motor. It also only has 100,000 miles on it. I'm going broke, so any help would be great. 
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#2
08-03-2009, 09:20 PM
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Re: Car bogs or dies when accelerating. I can't figure it out!!!
Rent a fuel pressure guage from advance or oreilley's and check fuel pressure. Report back with your numbers of fuel pressure key on engine off, and engine running at idle.
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-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#3
08-04-2009, 12:00 AM
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Re: Car bogs or dies when accelerating. I can't figure it out!!!
What about the catalytic converter or muffler? Your symtoms sound more like these would be your problem.
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97 Grand Prix GT 360,000 miles as of 02-01-09 391 000 miles as of 11-17-11 400,000 miles as of 3-15-13 01 Duramax/Allison 07 G6 convertible
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#5
08-06-2009, 12:53 PM
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Re: Car bogs or dies when accelerating. I can't figure it out!!!
My Brother said he checked the fuel pressure gauge, and it was around 40 off, 45 on. Like 37.6, but could remember exact numbers. Have not tried the cat yet, and the 02 sensor wasn't changed. My mistake. Could it be the 02 sensor? We also found no breaks in the wiring, it all looked good.
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