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Could the pcm be at fault?

Tiny
KINTGEN
  • MEMBER
  • 1999 CHEVROLET MALIBU
  • 190,000 MILES
Just replaced the intake gasket on a 1999 chevy malibu 3100 motor last week and went good but ended up having multiple misfire code PO300 and tried disconnecting the crankshaft and camshaft sensors but the engine ran the same, bad.
Sunday, October 9th, 2011 AT 1:39 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Doing that did nothing. After the intake gasket, it is not uncommon for the lifters to be a issue till they pump up or down. In the worse case senerio, you may have to replace the lifters.

Did it run ok before this repair?

Roy
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Sunday, October 9th, 2011 AT 2:31 PM
Tiny
KINTGEN
  • MEMBER
  • 2 POSTS
Nvm. I believe the problem has to do with how we were going about getting the lifters to pump up. Hitting the throttle made the computer set up wrong so the rpm would set so high on accident that when the engine would go to idle and would just shut off
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Thursday, October 13th, 2011 AT 10:18 PM
Tiny
ASEMASTER6371
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Hitting the throttle did nothing. The lifters either pumped up or down should center themselves after about 30 seconds to a minute. If they dont, then there is an issue.

Roy
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Thursday, October 13th, 2011 AT 10:28 PM
Tiny
ROY ROLDAN
  • MEMBER
  • 1 POST
MY 99 CHEVY MALIBU IS DOING THE SAME THING AFTER I REPLACED THE LOWER INTAKE MANIFOLD HOW DO I FIX THIS
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Saturday, May 5th, 2012 AT 10:46 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Most likely you must replace the lifters and basicly repeat the job.

Roy
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Saturday, May 5th, 2012 AT 10:49 PM

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