Question about 1999 Pontiac Bonneville

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1991 Pontiac Bonneville V6 FWD

The check engine light has been on for about 1 month now and I need to know what could be causing this. I would admit that right about the time the light came on I noticed an occassional hickup, studdering of the engine upon acceleration from a standing stop. I figured it was probably bad gas, but wasn't completely convinced of that. However, just yesterday, which was the hottest day of the year (91 degrees), the car exibited this studdering like never before. Driving down the road the problem was really bad and I almost didn't get home. After letting it sit for a while, the problem temporarily went away, but returned soon after. Could this just be vapor-lock and not related to the check engine light, or is there something I need to look into?

Please let me know, thanks.

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Sounds like your not getting enough fuel from a bad fuel pump. As the pump heats up it stops sending the proper PSI of fuel from the pump to your engine. As it cools down it gets better but quickly returns once the pump heats back up. The only real solution is replacing the pump and fuel filter.
Make sure in the future to keep at least a half a tank of gas in it as the gas cools the pump.


Hope this helps..

Joe

Posted on May 19, 2009

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91 bonneville has high rpms with slow to little acceleration


I would check the computer for trouble codes first. The codes will point you in the right direction to look.
You can do an internet search for the procedure to retrieve the codes and the codes list.
Look for "GM OBD-1 Codes" There is a plug under the steering column you use a jumper wire to make the check engine light flash the codes.
Meanwhile, a faulty idle air control valve, throttle position sensor, or major vac leak could cause both problems.

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netvan_232.png

I hope this helps.

Regards,

Jerry

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Apr 03, 2010 | 1991 Pontiac Bonneville

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For the 1989 Pontiac Bonneville 3.8L V6:

Firing Order:
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.......(back)
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1997 PONTIAC BONNEVILLE - V6 3.8L 231ci GAS FI N K
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1997 PONTIAC BONNEVILLE - V6 3.8L 231ci GAS FI S 1
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1997 PONTIAC BONNEVILLE - V6 3.8L 231ci GAS FI S 1
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eb261af.jpg


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1 Answer

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1 Answer

Replacing bad camshaft position sensor


  1. Disconnect battery ground cable.
  2. Remove water pump pulley attaching bolts, then the serpentine belt and water pump pulley.
  3. Disconnect sensor wiring connector and remove sensor retaining bolt.
  4. Twist and pull sensor to remove.
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It is located under the water pump. Make sure when you remove the sensor that you rotate the crank shaft and look in the hole to make sure the pick up magnet is still in there. Sometimes they come loose and cause a no start or long crank. You will need to have the code cleared still.

May 06, 2009 | 1991 Pontiac Bonneville

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