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2002 Chevrolet Monte Carlo Starts but wont run right

Tiny
STTODD
  • MEMBER
  • 2002 CHEVROLET MONTE CARLO
  • 3.8L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 54,000 MILES
I can start the car but when its put in gear or sits running for a few minutes it runs very rough. Then dies out. I have code reader but it reads that there is 0 problems.
Monday, November 17th, 2014 AT 7:37 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Check for engine vacuum leaks and check to make sure the idle air control valve (IAC) is working properly. The IAC is responsible for maintaining a steady idle speed.
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Tuesday, November 18th, 2014 AT 4:59 AM
Tiny
STTODD
  • MEMBER
  • 5 POSTS
I have checked for airline leaks and changed the IAC valve. The car is still the same. I am getting nothing on the dash and no codes coming up. I am using an actron cp9125 OBD II scan. If the censor was malfunctioning it would give me a code. Right?
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Tuesday, November 18th, 2014 AT 3:20 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Not always. Which engine do you have?
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Tuesday, November 18th, 2014 AT 5:41 PM
Tiny
STTODD
  • MEMBER
  • 5 POSTS
I have a 3.8 no turbo, no mods.
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Tuesday, November 18th, 2014 AT 7:13 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
I'm not familiar with that scanner. Can it read live data? Also, are you certain that the intake isn't leaking?
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Wednesday, November 19th, 2014 AT 6:41 AM
Tiny
STTODD
  • MEMBER
  • 5 POSTS
I don't believe the scanner is reading live data. I am 99% certain I have no intake leaks. I have run every line and every connection. I had it towed to a shop and it ran fine for them there. I brought it home and it wont leave the driveway again. Could it be the MAF censor? Also the throttle body was caked with debris. Could cleaning it have ruined another censor? I am at a loss with this problem. I NEED this car to work. Thank you for your time.
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Wednesday, November 19th, 2014 AT 8:07 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Yes, a MAF sensor can cause a problem. However, if there was that much junk in the TB, are you sure it didn't foul the spark plugs when you cleaned it?
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Wednesday, November 19th, 2014 AT 8:28 AM
Tiny
STTODD
  • MEMBER
  • 5 POSTS
I took it off to clean it, I didn't want to have that problem. I am going to replace the MAF sensor and see if that's it.
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Wednesday, November 19th, 2014 AT 9:02 AM

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