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Old 02-07-2012, 01:49 PM   #1
xxallonblack
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Exclamation '97 Grand Am GT Acceleration Issues

Hey there guys, I have a 1997 Grand Am GT Coupe with around 153,000 miles on it. We just replaced the Throttle position sensor, Cam shaft position sensor, spark plugs and wires and I am still getting a cylinder misfire error when looking at the check engine log. When accelerating, my car will not pick up and go, but slowly accelerate.

Also, at around 55 mph, I will have my gas pedal steady or even using my cruise control.. but the RPM's will drop from around 2,000 down to 1,500. I will let off the gas and it will jump back up to 2,000 RPM's. Has anyone ever experienced something like this?? It was idling around 3,500 to 4,000 RPM until we changed the spark plugs and now it idles fine. Please let me know if you have any other questions about the car for diagnostic purposes!!!
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Old 02-07-2012, 07:58 PM   #2
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Quote:
Originally Posted by xxallonblack View Post
Hey there guys, I have a 1997 Grand Am GT Coupe with around 153,000 miles on it. We just replaced the Throttle position sensor, Cam shaft position sensor, spark plugs and wires and I am still getting a cylinder misfire error when looking at the check engine log. When accelerating, my car will not pick up and go, but slowly accelerate.

Also, at around 55 mph, I will have my gas pedal steady or even using my cruise control.. but the RPM's will drop from around 2,000 down to 1,500. I will let off the gas and it will jump back up to 2,000 RPM's. Has anyone ever experienced something like this?? It was idling around 3,500 to 4,000 RPM until we changed the spark plugs and now it idles fine. Please let me know if you have any other questions about the car for diagnostic purposes!!!
Is it consistently the same cylinder that's misfiring or more than one? What plugs did you put in?
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Old 02-08-2012, 10:01 AM   #3
xxallonblack
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I believe it is the same cylinder, and we got generic plugs and wires.. the cheapest from advanced auto. Originally it was the high idling that made us do the tune up, and now the idling issue is gone, it just bogs down and has the misfire code.
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Old 02-08-2012, 12:15 PM   #4
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I think the code was PO300.
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Old 02-08-2012, 04:08 PM   #5
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Were you getting the misfire code prior to the plug and wire change? I think that code is a nonspecific misfire which could be multiple cylinders. If you weren't getting a misfire prior to the plugs I'd say that could be the problem even though they are brand new. NGK and AC/Delco Iridium plugs are the only 2 that I know for sure work well.

Of course the cam sensor could also be the trouble because it signals the plugs and such on when to fire. So it could be all jacked up.

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Old 02-09-2012, 09:41 AM   #6
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First off, what engine do you have?

I think the rpm drop at cruising speeds is just the tc locking up for better mileage. Suppose to do that.
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Old 02-09-2012, 09:55 AM   #7
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Okay, I will have to replace the wires and plugs first. I just changed the cam sensor.. and when after that we did the plugs and wires. The wires and plugs were the cheapest because I did not have money at the time. Also, no I was not getting the code before we changed the plugs and wires, so we will start there!

@CraiGT the 3.4 L V6, I guess the standard on '97 GT Coupes? And with the tc locking up I guess that does sound possible, but I just never heard of that before and it has never done this before, or at least I never noticed it .
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Old 02-09-2012, 09:22 PM   #8
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Thats standard for most cars. But not the 3400 part. That only came in the 99 and up Grand Ams. You should have the 3100. You need to verify this.
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Old 10-06-2012, 10:02 AM   #9
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Thats standard for most cars. But not the 3400 part. That only came in the 99 and up Grand Ams. You should have the 3100. You need to verify this.
Yes, you were correct. It is the 3.1 L engine. There was a bad wire harness around the TPS/ throttle body that we replaced and it stopped the idling at 3k+ RPMs, not it is just slow to accelerate. Was having over heating issues, also. Replaced the water pump, coolant temp sensor, thermostat, heater core, flushed the radiator and put a 50/50 mixture in.

Since it is slow with acceleration, we thought it may be a fuel pressure problem. Changed the fuel filter, fuel pressure regulator, and it stays at around 20 psi - 24 psi. I was reading it should be above 35+? Is this correct? Also what problems could cause this? Changing the spark plugs and wires again in the near future.
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Old 10-06-2012, 10:24 AM   #10
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> Old thread.
> You finally answered back to him 8 months later.


K.
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Old 10-06-2012, 11:01 AM   #11
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> Old thread.
> You finally answered back to him 8 months later.


K.
Thank you for your constructive post, honestly haven't seen one this helpful. Props.

I forgot that I even posted on here and googled my issue and found this post, and once again posted in it. If were to start a new thread I'm sure you would have also replied saying "use the search" then I would search, find my thread that I already started, and probably would have gotten the same reply. So thank you again for the completely useless response.
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Old 10-06-2012, 11:06 AM   #12
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Quote:
Originally Posted by xxallonblack View Post
Thank you for your constructive post, honestly haven't seen one this helpful. Props.

I forgot that I even posted on here and googled my issue and found this post, and once again posted in it. If were to start a new thread I'm sure you would have also replied saying "use the search" then I would search, find my thread that I already started, and probably would have gotten the same reply. So thank you again for the completely useless response.
Welcome to GAGT, enjoy your stay.
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Old 10-06-2012, 11:55 AM   #13
xxallonblack
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Welcome to GAGT, enjoy your stay.
And once again. But, thank you for the free bump.
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Old 10-06-2012, 12:01 PM   #14
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Well...this guy isn't going to last long here.
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Old 10-06-2012, 12:03 PM   #15
xxallonblack
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Well...this guy isn't going to last long here.
I'm surprised you've lasted this long, you can't even stay on topic or add anything worth reading.
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