1999 Chevy Cavalier cold start rough idleing

154,000 MILES • 4 CYL • 2WD • MANUAL
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HLMAXWELL34
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  • 3 POSTS
1 month ago car would start fine then it would start to bog and idle very roughly for about 5 seconds or till i gave it some gas. then 5 days ago my car wont even start in the morning it will crank and crank untill the battery dies out. it sounds like it is just about to turn over but doesnt and i have kind of dark oil and smells a little bit of gas no fuel filter problems or pump is all good and looked in the fuel pressure regulater and pumps good out of there and the screen is cleaned and everything coil pack and all the injecters seem to work fine checked all the fuses and relays i scanned the codes and comes up as p0113 which is my iat sencer and has been on since i bought the car and also my p0300 which is multi cylender misfire which is new.
Feb 24, 2010 at 8:05 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
A bad IAT sensor will cause PCM to default to a very rich mixture causing engine to flood.

I would replace IAT sensor, get codes erased.
Feb 25, 2010 at 12:11 AM
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HLMAXWELL34
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  • 3 POSTS
Now the car will crank but it wont start at all now.
Feb 26, 2010 at 3:40 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
Check fuel pressure with a mechanical gauge, if OK, then spark, by removing plug, attach wire and ground to valve cover bolt, crank engine a few seconds and spark shoud be blue in color and make a snapping noise.
Feb 26, 2010 at 11:25 PM
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HLMAXWELL34
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  • 3 POSTS
what if it produces a white spark
Feb 28, 2010 at 6:09 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
Spark should be blueish and make a snapping noise.
Mar 2, 2010 at 11:13 PM
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