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1999 Chevy Cavalier cold start rough idleing

Tiny
HLMAXWELL34
  • MEMBER
  • 1999 CHEVROLET CAVALIER
  • 4 CYL
  • 2WD
  • MANUAL
  • 154,000 MILES
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.
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Wednesday, February 24th, 2010 AT 4:05 PM

5 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 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.
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Thursday, February 25th, 2010 AT 8:11 AM
Tiny
HLMAXWELL34
  • MEMBER
  • 3 POSTS
Now the car will crank but it wont start at all now.
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Friday, February 26th, 2010 AT 11:40 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 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.
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Saturday, February 27th, 2010 AT 7:25 AM
Tiny
HLMAXWELL34
  • MEMBER
  • 3 POSTS
What if it produces a white spark
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Sunday, February 28th, 2010 AT 2:09 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Spark should be blueish and make a snapping noise.
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Wednesday, March 3rd, 2010 AT 7:13 AM

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