RE: 95 GMC runs rough after warmup

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RE: 95 GMC runs rough after warmup

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Chevrolet Forum >> Chevy Trucks, Vans & SUV's >> Silverado >> RE: 95 GMC runs rough after warmup

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RE: 95 GMC runs rough after warmup - 4/7/2008 6:45:24 AM

jmack91z28

Posts: 162
Joined: 2/27/2008
Status: offline

That sounds like a pretty good guess, usually when the 02 is going bad your fuel economy goes bad too, have you noticed that?

(in reply to buster)

Post #: 21

RE: 95 GMC runs rough after warmup - 4/7/2008 9:17:00 AM

95k1500z71

Posts: 4
Joined: 4/5/2008
Status: offline

on obd1 youre knock wont pick up small things ie miss fire,bad o2. thats why all new cars have a millon senscore where the older cars dont. you may not see a drop in fuel ecom, the o2 has a hot/warm and a cold setting, so it sounds like thats where youre having issues. when i got to work ill get you the read out for a bad o2 and you can see if it mattchs.

(in reply to buster)

Post #: 22

RE: 95 GMC runs rough after warmup - 4/7/2008 10:36:56 AM

buster

Posts: 78
Joined: 10/17/2006
Status: offline

Yea, my fuel consumption is about 17 / 17.5 on highway, thats about as good as they will do I believe.

(in reply to 95k1500z71)

Post #: 23

RE: 95 GMC runs rough after warmup - 4/7/2008 10:59:21 AM

itstheiceman

Posts: 12
Joined: 4/2/2008
Status: offline

use an obd2, and x2 on the o2 sensor, or the temp sensor

< Message edited by itstheiceman -- 4/7/2008 11:00:16 AM >

(in reply to buster)

Post #: 24

RE: 95 GMC runs rough after warmup - 4/7/2008 3:29:52 PM

buster

Posts: 78
Joined: 10/17/2006
Status: offline

WHAT?????? what are you talking about Iceman?

(in reply to itstheiceman)

Post #: 25

RE: 95 GMC runs rough after warmup - 4/25/2008 2:03:09 AM

hquick

Posts: 53
Joined: 4/24/2008
Status: offline

My first thought is O2.
Prior to warm up the truck is in open loop (not using the O2's). Once warm...it goes into closed loop and the O2's adjust fuelling.
I'd replace the front O2's. (if that model has rear O2's..so 4 all up...they only run emissions checks and throw codes accordingly...have nothing to do with fuelling).

_____________________________

Regards

Howard

(in reply to buster)

Post #: 26