Question about 2007 Pontiac G5 Gt Coupe

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RPM's hanging problem

I have a Pontiac G5 Coupe GT 2007, it has 23,000 km (14,291 miles). I live in México (dealer told me even same cars would be diff here than in the US, don't know if that's even true)
While driving home from work, the RPMs would drop extremely slowly when trying to shift. I would push the clutch in, shift, and then I would have to wait about 10-15 seconds before the tach would drop enough to match rpms for the shift, the check engine light turned on, I took it to the dealear but they said they couldnt find the problem, that everything was fine with the car (rpms werent hanging anymore). They told me the code of the light was because of using the clutch hard or too much. I was like ?¿ because i knew I didnt.
The same day they gave me back the car, it was ok for 1 hr then it started doing it again and the check engine light turned on again.
Also my cruise control is not working anymore, I dont know if its related.

They already cleaned the throttle body, checked the TPS and the IACV and it doesn't look like a vacuum leak.

Any help would be really appreciated!

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6 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: no acceleration

I had the same problem with one exception. It would rev higher than 3500 but the higher it revved the more it bogged. I had the catalytic converter replaced. I thought I bought a new car. Acceleration is just like new. It was easy enough to test. My mechanic cut a hole in the exhaust pipe in front of the catalytic converter. It sounded like a truck but the acceleration difference was immediate. Easy diagnosis.

The car is hard to shift because the more you press on the accelerator the more the computer for the transmission won't let it shift. Which in turn causes the car to bog more sending more unburned fuel into the catalytic converter. Which in turn causes more carbon build up and more back pressure. Vicious cycle. It will only get worse.

My thermostat caused the entire problem. Thermostat was stuck open, engine never got to operating temp most days. Car burned rich. Bad gas mileage. A lot of unspent fuel being dumped into the converter. Probably have some underlying cause that needs to be addressed. Bad plugs, wires, coil, fuel filter.

Posted on Jan 21, 2009

  • 1 Answer

SOURCE: check engine light stays on all the time(2006 pontiac g5 gt)

check the cam shaft senser i just had 1 put on my chrysler sebring and the engine light went off

Posted on Apr 22, 2009

  • 1 Answer

SOURCE: Bouncing RPMs

My car would do the same thing turned ot to be a loose wire at the coil/distributor. there is a plug connector with tow wires one wass loose I crimped the wire no works great

Posted on May 12, 2009

  • 1949 Answers

SOURCE: my girlfriend has a 2003

replace the temputer sensor it dont know to choke the motor or not so to speak

Posted on Feb 21, 2011

  • 143 Answers

SOURCE: I have a 2004 grand

i had a problem with all my lights coming on in my 2006 explore took it to dealer to find out that the battery was dying replaced it and they went away

Posted on Mar 26, 2011

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