|
12-19-2010, 11:49 PM
|
#1 |
|
Senior Member
 
Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
|
02 GMC Troubles
My 02 GMC runs like crap while it is cold outside(20 degrees and below). The idle is at 600ish and will drop to 300 and then go back up to 600 for a few seconds then drop, just repeating this procedure. It will surge at around a 1000-1200 rpms while in gear driving to, dropping a few hundred then going back up. It will trip two codes unless i don't clear them, then it'll trip another 2. the two common codes are right and left bank lean. then it sometimes trips multiple misfire and poor idle codes. the o2 sensors are original i believe, intake gaskets are original, egr is original. Has about 98k on the truck. It will not do this during summer when it is warmer, just during winter, so I was wondering if anybody has any suggestions to test for problems, or have run into this problem, etc. The truck is a 5.3 with automatic. thanks
__________________
68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
|
|
|
12-20-2010, 01:06 AM
|
#2 |
|
Truck Enthusiast
Join Date: Dec 2006
Location: Arlington, WA
Posts: 1,346
|
Re: 02 GMC Troubles
I would start with new plugs, wires and replace 2 primary o2's(ones in front of the cats). as it gets colder, the air is denser. if your 02's are going out, they'll have a tougher time reading correctly
__________________
'85 swb |
|
|
|
|
12-30-2010, 08:47 PM
|
#3 | |
|
Registered User
Join Date: Nov 2010
Location: Northeast Pennsylvania
Posts: 334
|
Re: 02 GMC Troubles
personally, i'd also run injector cleaner through it, because if there is anything in there, you'll notice a difference with a bottle of that run through.
__________________
1967 K-10 4x4 with a 3" lift and 35" BFG mud terrains  Quote:
 want to see some slow progress on my truck? http://67-72chevytrucks.com/vboard/s...d.php?t=436560 <-click there |
|
|
|
|
|
01-05-2011, 12:18 AM
|
#4 |
|
Registered User
Join Date: Jul 2009
Location: blacksburg,s.c.
Posts: 155
|
Re: 02 GMC Troubles
my 02 was doing the same thing, for 2 winters it has, summers runs fine.....what i did that has helped mine was to snug, and i say snug the intake mounting bolts, it made a world of difference in cold weather.
|
|
|
|
|
01-21-2011, 05:21 PM
|
#5 |
|
Registered User
Join Date: Jul 2009
Location: blacksburg,s.c.
Posts: 155
|
Re: 02 GMC Troubles
Any updates? is it fixed, sold, traded?
|
|
|
|
|
01-21-2011, 06:13 PM
|
#6 |
|
Senior Member
Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
|
Re: 02 GMC Troubles
I just got it back from the shop, it was the intake gaskets. It runs perfectly now. thanks for the help.
__________________
68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
|
|
|
 |
| Bookmarks |
|
|
Linear Mode
