1998 Chevy Malibu engine misfires

Tiny
ADMVALENTINE
  • MEMBER
  • 1998 CHEVROLET MALIBU
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
Here it is car drove fine at night then the next morning I got in it asnd drove 100 hards before it died on me engine would start but misfired badly only code was random cylendar misfire ive replaced the plugs coils icm cam sencer crank sencer throtle sencer and finaly today I replaced the brain with one from same year car same engine same exact part numbers on it ect its exactly the same brain and it wont start at all now please help me before I go nuts
Saturday, September 13th, 2008 AT 4:32 PM

9 Replies

Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Whe you replaced the computer you set off the security system. Turn the key off for 10 seconds. Crank the engine real quick, and watch for the security light to start blinking. When it does leave the car alone until the light stops blinking. This should take between 10-30 mins. When it goes off, turn the key off for 10sec. Then try to start it. Let me know what happends
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Sunday, September 14th, 2008 AT 2:19 PM
Tiny
ADMVALENTINE
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  • 5 POSTS
Nope that didnt work I believe somone has bypassed the security on this vehicle. Any other ideas?
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Tuesday, September 16th, 2008 AT 9:41 AM
Tiny
RHALL77
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Did the light blink at all when you did it
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Tuesday, September 16th, 2008 AT 9:44 AM
Tiny
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No but the gas gage spun arround lol
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Tuesday, September 16th, 2008 AT 11:34 AM
Tiny
RHALL77
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Does the light work at all
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Tuesday, September 16th, 2008 AT 12:27 PM
Tiny
ADMVALENTINE
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  • 5 POSTS
Yes the light is always on how do I test the egr I hook it to 12 volt positive and neg on the outside of the 5 pins and it jumps but it doesent move at all on the middle 3 pins
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Wednesday, September 17th, 2008 AT 11:38 PM
Tiny
RHALL77
  • MECHANIC
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You have a security code in the system. Any time you disconnect a pcm for the vehicle you set off the security. It needs to be reprogramed to finish and more diagnose on the vehicle.
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Thursday, September 18th, 2008 AT 7:16 AM
Tiny
ADMVALENTINE
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  • 5 POSTS
Sooo how do I do that then?
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Thursday, September 18th, 2008 AT 9:26 PM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Take it to the dealer
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Friday, September 19th, 2008 AT 2:53 PM

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