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.
Wednesday, February 24th, 2010 AT 4:05 PM

5 Replies

Tiny
MMPRINCE4000
  • 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.
Was this
answer
helpful?
Yes
No
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.
Was this
answer
helpful?
Yes
No
Friday, February 26th, 2010 AT 11:40 AM
Tiny
MMPRINCE4000
  • 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.
Was this
answer
helpful?
Yes
No
Saturday, February 27th, 2010 AT 7:25 AM
Tiny
HLMAXWELL34
  • MEMBER
  • 3 POSTS
What if it produces a white spark
Was this
answer
helpful?
Yes
No
Sunday, February 28th, 2010 AT 2:09 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Spark should be blueish and make a snapping noise.
Was this
answer
helpful?
Yes
No
Wednesday, March 3rd, 2010 AT 7:13 AM

Please login or register to post a reply.

Related Engine Idle Rough Content

Rough Engine Idle
GUIDE
Rough Engine Idle
A rough engine idle condition is a common issue that many drivers face often indicating underlying problems within the engine, fuel or ignition system. We have created this...
VIEW MORE