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Hesitation at 2000 RPMs

Ok, I got the chance to test the GP out. Hesitation is still there, but it's not as bad as it was before, at least not in the 10 minutes drive I took. Driving to work tomorrow I'll really know it.

Plus, I have to try to fix the TPS error on my Impala that only came up after I did the test swap. It's possible that I shorted it out when I swapped it.
 


Ok, I got two more working TPS to install on the GP and Impala. This time, I disconnected the battery before doing any swaps. Impala error cleared up immediately, but haven't given it a test drive. For the GP, when I first started it up, the SES light was not on, but my scan tool had a P0122 in pending. I deleted that pending error, and it did not come back up. Drove the car and had 4-5 stop/restart cycles during various errands, and it has not returned!

I would recommend connecting a scan tool and see if you have a pending error of P0121 or P0122. Both of them are TPS codes. My hesitation is gone, and all SES errors are gone, knock on wood.
 
Hi there long time since I've been on the forum but nice to be back I also have the same problem, in fact it started just after a full tune up, checked vac lines, plugs, wires fuel filter and even took the throttle body apart and cleaned it up still doing the same thing. I'll go ahead ant take your advise and chage the TPS to check how it turns out.


Oh by the way just to make sure I don't mess up which one is the TPS. :o
 
Corona99GT said:
Hi there long time since I've been on the forum but nice to be back I also have the same problem, in fact it started just after a full tune up, checked vac lines, plugs, wires fuel filter and even took the throttle body apart and cleaned it up still doing the same thing. I'll go ahead ant take your advise and chage the TPS to check how it turns out.


Oh by the way just to make sure I don't mess up which one is the TPS. :o
Click to expand...

If you know where the throttle body is, it's the connector that is at the side towards the front of the car. The throttle cables are directly behind it, towards the back of engine bay. Once the TPS is removed, and you move the throttle by hand, you will see the throttle position bars move. I found it easier to remove most of the electrical connections on the throttle body and air intake. It requires a secure-Torx wrench to remove.
 


Ok, I finally got to the bottom of this terrible surgeing problem. Not sure if all of us have the same problem however, I will give you the recent history of my car.
2002 grand prix GT 3.8.
Car sometimes didn't want to start and then eventually left us on the side of the road one day.
Mechanic stumbled upon weird readings from the Mass Airflow Sensor. We put a used one on and car seemed to work good.....except it had another problem. Under load it would have a very abrupt mifire that would jolt me in the seat. I drove a week and ended up wrecking the cat in the process due to misfires. DOH!
New cat later and I finally determined it was a bad mass air sensor from the doner car.

Next mass air sensor(current one).
This is when I noticed the surging problem however it never sets a code and the misfire is gone. Everything has been perfect except for the surging so naturally I blamed other things.

Lastweek I got mad and puller over on the side of the road and I UNPLUGGED the mass airflow sensor. PROBLEM SOLVED!

Car drives 95% perfect without it hooked up so that is how I'm running right now until I can afford a brand new sensor. And they engine light IS on.

Hope this helps you guys. Try it.

By the way, everyone I talk to says one GM went to this style of mass air sensor they have seen nothing but problems.
 
I'm at 163K on my GP; I think I put a junk yard MAF sensor on it about 50-60K miles ago, but I've not had problems since. When I had to disconnect the MAF sensor due to starting problems, it idled heavy and ran a bit rough compared to when the MAF sensor was good. My car died, just like you said, when the MAF sensor gave up. But the replacement has been running well. Periodically I'll take it out and give it a spray of MAF sensor cleaner, and it's been all good. My Impala is still on the original sensor.

Also, I cleaned the K&N filters last year, but must have applied the oil properly as I didn't have any codes thrown.
 
I don't know if I had the same problem, mine was surging very badly in higher gears between 2000 and 3000 RPM with the engine under load. I wasn't setting any codes and had changed plugs and wires. It seemed to gradually get worse. Most posts and searches seemed to point to bad solenoids or valves in the transmission. I found a post that suggested disconnecting both battery cables and shorting them together for about 30 minutes. I was swapping to a digital DIC anyway so it seemed like a good time to try it. After the swap was done, I reconnected the battery and have had no surging at any speed at all. That was about 8 months ago. Problem fixed. It's worth a try, the cost is very affordable! 0$ and a few minutes of your time.
 
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