While driving the car doesnt rev more than 4000 rpm - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-10-2009, 12:43 AM   #1
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Default While driving the car doesnt rev more than 4000 rpm

Hello guys!

My car is Bonneville 1994.

I know that bonneville has a rev limiter in neutral and park gear, but mine bonneville doesnt rev more than 4000rpm while driving. This started suddently two days ago and once in a while it disappears and the car works properly.

Any ideas?

Where can I find the sensor which detects the gear or something?

Thanks for your help!

-Tama
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Old 03-10-2009, 07:43 AM   #2
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There are also limiters in the drive gears too, not sure what they are for your year
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Old 03-10-2009, 08:03 AM   #3
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Almost sounds as if your motor is in limp mode. Problem is our Bonnevilles of that years didn't come with that programmed into the PCM.

So my next concern would be a plugged fuel filter starving the motor for fuel not allowing it to take in more fuel as you press down the gas peddle.

When is the last time you replaced the filter?
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Old 03-10-2009, 10:14 AM   #4
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Quote:
Originally Posted by Toddster View Post
Almost sounds as if your motor is in limp mode. Problem is our Bonnevilles of that years didn't come with that programmed into the PCM.

So my next concern would be a plugged fuel filter starving the motor for fuel not allowing it to take in more fuel as you press down the gas peddle.

When is the last time you replaced the filter?
I bought the car two weeks ago so I dont know when the filter is changed. Where the filter is located?

Limp mode? When it came to Bonnevilles?

Could it be related to the fact that my friend drove the car and changed the gear to the 1st gear while driving. I dont know how fast he was going and I dont know what was going through his mind when he did it... But I think after that the problem started.

Could the PCM be reseted easily? Because the service light is on once in a while as well.

-Tama

Last edited by Tama; 03-10-2009 at 10:16 AM.
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Old 03-10-2009, 10:25 AM   #5
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If you can get the trouble code that will help out a lot. Try going to a local autozone or other auto parts store.
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Old 03-10-2009, 11:33 AM   #6
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Ok. maybe I should do that. I think the problem is not the fuel filter because the car accelerates normally even in high speeds until the revs hit 4000. If the fuel filter is plugged the car would probably stumble when accelerating hard with low rpm because then the needed fuel amount is high as well..
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Old 03-10-2009, 12:20 PM   #7
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i would definately suggest checking for codes, change the fuel filter its like 15 bux, and look into getting new plugs and wires if you have the $$$, its not expensive but ive had revving problems due to faulty plugs and wires, but get good brands, these cars are finacky and dont take well to crappy parts lol
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Old 03-10-2009, 12:39 PM   #8
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Try takign a spray bottle filled with water and mist teh wires, plugs, and coils while the engine is running. Do this at night and watch in the dark. If you see blue flashing you have a grounding problem.
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Old 03-10-2009, 02:26 PM   #9
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Thanks for good tips!
I went to autozone to read the codes and while driving there the car worked again perfectly...... So I really dont know what is going on. Maybe the sensor which detects the gear is not working properly and once in a while it detects that the gear is in neutral eventhoug its in the drive.... The rec cut is very smooth so I doubt that the problem is in ignition.. If the problem would be there the sound would be different.. pam pam in the exhaus.. u know..

And one thing is that the engine service light is on some times, so could that limit the rev to 4000? Now it was off all the time and the car worked...

-Tama
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Old 03-10-2009, 03:23 PM   #10
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Reading the codes will tell you what the light is from, even if it'* no longer on when you are getting them read. The computer stores then in history.

Give this test a try for me. Get rolling to 20mph, slide the shifter to N and see if it will rev past 4K. Make sure you don't overdo it and try to blow it up, you are only trying to get past 4K.

If it doesn't, and the check engine light doesn't pop on or flash, then I have an idea where to look next.
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