SPONSORED LINKS

Idle problems an rich exhaust

Tiny
BMXWAYNE
  • MEMBER
  • 1993 PONTIAC SUNBIRD
  • 4 CYL
  • FWD
  • MANUAL
  • 231,000 MILES
I have a 1993 pontiac sunbird and it has been idling rough stalling at idle and have gotten a rich exhaust code also have a drop in mpg
Saturday, December 18th, 2010 AT 5:09 PM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,171 POSTS
What code did you get? When was the last tune up? Have you checked the fuel pressure regulator?
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, December 21st, 2010 AT 3:45 PM
Tiny
BMXWAYNE
  • MEMBER
  • 58 POSTS
It was code 45 I cleared the code and it has not come back but still having problems last tune up is pretty recent how can I check the fuel pressure regulator there is no connection for a pressure gauge
Was this
answer
helpful?
Yes
No
Tuesday, December 21st, 2010 AT 11:36 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,171 POSTS
45 oxygen sensor rich exhaust. It could be a bad O2 sensor. As far as the fuel pressure, you need a "T" adapter to place in the fuel line if there is no schrader valve.
Was this
answer
helpful?
Yes
No
Wednesday, December 22nd, 2010 AT 1:31 PM
Tiny
BMXWAYNE
  • MEMBER
  • 58 POSTS
Is there anyway to test the 02 sensor
Was this
answer
helpful?
Yes
No
Wednesday, December 22nd, 2010 AT 10:23 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,171 POSTS
Yes, you need to check for resistance.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Thursday, December 23rd, 2010 AT 1:08 PM
Tiny
BMXWAYNE
  • MEMBER
  • 58 POSTS
How much resistance should there be I do have an analog multimeter
Was this
answer
helpful?
Yes
No
Thursday, December 23rd, 2010 AT 10:27 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,171 POSTS
I did more research. I want you to check the O2 sensor for a ground issue. I have attached a schematic. Here is what I need you to do. You need to check voltage to the sensor. You should get a.45 volt reference power supply from the control module. Check that. Also, with the engine warmed up, you should get between.35 and.55 voltage reading off idle.

As far as the wires you are looking for, ECM terminal C7 is a purple wire from the ECM (power supply) and C8 is a tan wire (ground). Based on everyting I read, that sounds like where the problem is coming from. Just keep your fingers crossed that it is a bad ground.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Sunday, December 26th, 2010 AT 6:21 AM
Tiny
BMXWAYNE
  • MEMBER
  • 58 POSTS
Ok o2 sensor was bad and I replaced it now I am getting code 33 map sensor circut signal voltage high/low low/high vacuum as described by chilton manual
Was this
answer
helpful?
Yes
No
Saturday, January 1st, 2011 AT 5:39 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,171 POSTS
Are you able to watch the MAP sensor's reactions via your scanner?
Was this
answer
helpful?
Yes
No
Saturday, January 1st, 2011 AT 8:10 PM
Tiny
BMXWAYNE
  • MEMBER
  • 58 POSTS
No I cannot it is an obd 1 system and now my car is giving me 7 codes could the prom chip be bad
Was this
answer
helpful?
Yes
No
Wednesday, March 2nd, 2011 AT 2:49 AM

Please login or register to post a reply.

Related Engine Idle Erratic Content

Vacuum Leak Test and Repair
VIDEO
Vacuum Leak Test and Repair
Instructional repair video
Idling High
GUIDE
Idling High
Intermittent sensor failure or shorting can cause the computer to act strange with unusual side effects, these problems are particularly tough to diagnose. The computer...
VIEW MORE

Sponsored links