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09-05-2009, 11:43 PM #1Jr. Apprentice
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Hello - Oh, and a warm running problem
Good Morning.
My 1992 Suburban is giving me fits with its warm running problem. I have chased problems from bumper to bumper, but the symptoms continue.
Some history; we purchased the 1992 K2500 7.4 Suburban with 190K miles on it, and it ran fine. It was parked for >6 months, while I had other irons in the fire.
I took it to be smogged, and it passed with flying colors. The most significant mechanical problem at the time was an annoying shifting problem, were it felt like the transmission was getting no speed input. I chased that problem down, with a replacement wiring harness and computer solving that problem.
I performed a standard tune-up; plugs, cap, rotor, wires, fuel filter, oil and filter change. Also, I changed the thermostat because it was stuck open.
It started having a hesitation problem, where it felt like 2 cylinders were falling out, so I changed out the coil, and added an MSD ignition system. No change.
I narrowed the symptoms down to being worse when warm, thinking maybe a lean-condition. I changed out the fuel pressure regulator and distributor pickup sensor, and the throttle position sensor. No change.
Anyway, it's driving me crazy. I still haven't figured out the problem, and I'm tired of throwing parts at it. Should I head to the dealership? Any thoughts, and help would be GREATLY appreciated.
Thank you,
Paul2005 K1500 Suburban LT 50K miles - All Stock
1992 K2500 Suburban 200K miles - Still Running
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09-06-2009, 01:21 AM #2Legend
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- Feb 2009
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- Greencastle, Pennsylvania, United States
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Welcome to the site!
Adam
2005 Z71 Silverado Crew Cab
previous:
'97 Chevy Suburban LT
'94 GMC Sierra SLE
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09-06-2009, 10:19 AM #3Legend
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- Dec 2008
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- Afghanistan...for now
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Welcome to the site...you might get more responses if you post in the tech section.
Bobby - North Carolina
2008 4x4 5.3L V8
6" Suspension Lift and 1.5" Body Lift
20x9 Ballistic Jesters w/35" Toyo Open Country MT's
4:56 Yukon Gears
Hypertech Speedometer Calibrator
Baja style bed mount spare tire carrier
Flowmaster 40 series dual exhaust
Recon Smoked LED tails and 3rd brake lights
N-Fab Nerf Steps
K&N CAI
No Fear Pedals
Tint, Line-X bedliner, Window visors, Rear wheel well liners
Painted front grill, bow ties and door badges, de-"lettered" tailgate
Powder coated front and rear bumpers
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09-07-2009, 02:50 AM #4Legend
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- Jun 2008
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- Colorado
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Welcome to the site!
Scott
ΜΟΛΩΝ ΛΑΒΕ
'94 Chevy Suburban K1500
3" exhaust w/ aero turbine non-baffled muffler
CFM Technologies TB spacer
CB w/ 44" whip antenna
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09-07-2009, 10:01 AM #5Legend
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- Feb 2008
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Welcome to the site, try a MAP sensor, some cars also have an IAC and that can do the same thing, the IAC you can actually take apart and clean
99 K1500 Suburban LT "THE BEAST"
5.7 K&N & True Dual Exhaust
Hypertech III
05 17" Silverado rims
99 LS 1500 5.3 "THE MULE"
Reg Cab Long Box
285/75/16E Dunlop Rover M/T
___________________________
Jason
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09-10-2009, 12:07 AM #6Sr. Engineer
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- Feb 2009
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- Southern CA
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Welcome to the site!
Michael, 17, CA
2005 Silverado - See my garage for my mod list
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09-10-2009, 04:09 PM #7Legend
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- Nov 2006
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Welcome to the site!
2010 Z/71 Colorado C/C
Black 4X4 w/5.3L V8
===============
2007 Winnebago Adventurer
w/8.1L Chevy & Allison 6spd.
Canyon Lake, Texas
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09-11-2009, 08:00 AM #8Master Mechanic
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- Feb 2009
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- Eagle Mountain Utah
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wlcome to the site.........
2000 Silverado Z71 Whipple Supercharger, JBA Headers,3" cat back Flowmaster Exhaust, Volant cai, Pioneer Preimer deck,Orion subwoofer,03 signal light mirrors,03 taililghts
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09-26-2009, 01:24 AM #9Master Mechanic
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- Sep 2008
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09-26-2009, 06:13 PM #10Jr. Mechanic
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Welcome to the site!
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