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#1
07-18-2008, 11:04 PM
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99 grand prix stumbles under load PLEASE HELP!!=)
hey all .. i need your help here
i have a 99 grand prix the engine runs fine in park.. but as soon as i put it in gear and take my foot off the brake.. it stumbles, backfires, and bogs.. the more gas i give it the worst it gets  so far weve changed the egr valve, disconnected the cat converter , and changed the #1 fuel injector (due to codes) all with no results  we are getting the code p0753 any help is greatly appreciated !!!!!!!!!!!   ive only got a a few days to get it running 
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#2
07-19-2008, 12:01 AM
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Re: 99 grand prix stumbles under load PLEASE HELP!!=)
I think P0753 has something to do with the transmission, but have you tried running it with the MAF sensor unplugged?
What motor and how many miles are on your car?
__________________
-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
07-19-2008, 02:46 PM
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Re: 99 grand prix stumbles under load PLEASE HELP!!=)
If it is not that, I think you have a fueling issue. Attach a gage to the schraeder valve on the fuel rail and see what you're getting.
A common failure amongst many GM vehicles, TBI to SFI included is the in-tank fuel pump in the 100-200k mile range. The TBI pumps seem to last a bit longer, guessing because they're under less stress since the output pressure is so much lower.
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#4
07-20-2008, 07:33 AM
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Re: 99 grand prix stumbles under load PLEASE HELP!!=)
P0753 is a transmission shift solenoid code that can set under this condition: 1-2 shift solenoid has a wiring fault, which means you need to have your valvebody worked on. Not an uncommon repair on these transmissions, the procedure can be done without removing your transmission.
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#5
07-20-2008, 02:28 PM
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Re: 99 grand prix stumbles under load PLEASE HELP!!=)
hey all thanx so much for all your hep!!!!
always appreciated for sure!!!!! ok first question is.. the transmission repair.. we just put a new transmission in .. the junk yard gave us a bad one before we had to take it out and replace it with a different one they gave to us.. they said they were sorry the trans was bad.. and heres a good one!! lol so is that valve body job a big job?? expensive one.. and would that cause the engine to stumble and backfire and all that good stuff under a load? i will check the fuel pressure also and with the maf sensor unplugged and i will get back to you as soon as possible again thanx!!!!!!!!!!
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