2004 Pontiac Bonneville 3.8L drives great but if accelerate too fast cuts off

Asked by Jan 06, 2016 at 07:20 PM about the Pontiac Grand Prix

Question type: Maintenance & Repair

While driving the 2004 Pontiac Bonneville 3.8L it drives perfect, shifts well and
all. If one accelerates too quickly or too hard vehicle backfires and shuts
off...any ideas?....any one?

8 Answers

79,155

Possible fuel pump. Running out of pressure, gas. Check fuel pump pressure to verify.

1 of 1 people found this helpful.
72,045

Agree,all so check ya fuel filter.

12,980

have the injectors tested as well.

4,655

Could also be a plugged catalytic converter although that doesn't usually make the car stall. Check the trouble codes. You will probably find some clues there. I had similar symptoms with an older Bonneville. It was throwing all kinds of codes and the mechanic felt the ECM was failing. I found if I drove it gently it would run fine. The car was pretty well miled out by then and got wrecked that winter so I never had to fix it.

Ok Here's what already been done...Fuel Pump, ECM, Cat, TP Sensor, MAF Sensor. There were no codes, after new ECM, it only threw out a O2 sensor, which led me to believe Cat clogged, replaced CAT...still same issue drives fine with a slow acceleration, a hard acceleration or quick acceleration, vehicle backfires & cuts off but starts right back up

79,155

Has the timing ben checked?

ok. Could be timing but now thinking bent or burnt valves may be the culprit, not sure. Think that there in lays the problem!! Will let you know!!

79,155

That motor has a timing chain, not likely to have jumped time. To verify this and bad valves just do a compression test.

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,448 nationwide Grand Prix listings starting at $2,200.

ZIP:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,580
  • #2
    Tom Demyan
    Reputation
    3,170
  • #3
    munron
    Reputation
    2,600
View All

Related Models For Sale

Used Chevrolet Impala
506 Great Deals out of 32,213 listings starting at $1,000
Used Pontiac Bonneville
4 Great Deals out of 407 listings starting at $1,995
Used Dodge Charger
325 Great Deals out of 36,256 listings starting at $1,999
Used Pontiac G8
10 Great Deals out of 400 listings starting at $4,450
Used Pontiac G6
32 Great Deals out of 3,783 listings starting at $1,000
Used Chevrolet Monte Carlo
5 Great Deals out of 1,186 listings starting at $1,125
Used Pontiac Grand Am
952 listings starting at $2,295
Used Pontiac GTO
3 Great Deals out of 392 listings starting at $3,950
Used Ford Mustang
344 Great Deals out of 41,947 listings starting at $1,488
Used Chevrolet Malibu
1,006 Great Deals out of 53,940 listings starting at $1,599
Used Chevrolet Camaro
374 Great Deals out of 31,404 listings starting at $3,495
Used Pontiac Firebird
6 Great Deals out of 691 listings starting at $3,911
Used Dodge Challenger
162 Great Deals out of 25,911 listings starting at $7,250
Used Jeep Grand Cherokee
872 Great Deals out of 71,824 listings starting at $900
Used Buick LaCrosse
320 Great Deals out of 14,433 listings starting at $500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.