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Prev Professional Automotive Repair Technical Discussions for June 29, 2007
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Open Help Requests for GM
Help Request Answers
1996 Cadillac DeVille 4.6L runing rich VIN: 1G6KD52Y1T
This car came in with the mil light on,code p0153-O2 signal slow bank 2 sensor 2.I found that the fuel trim on bank was runing rich.I sprayed the intake by the gasket and found that the gasket was leaking.I fix that and now I still have bank 2 runing rich.I us... Trouble codes: P0153 (O2 Signal slow bank 2 sensor 1)
2002 Cadillac DeVille DHS 4.6L No Start VIN: 1G6KE54Y02
Hello, I have This caddy with A no start no power windows or other Accessories, This Is the story I got from cutomer.They were driving car and Dash went Out and back On .Got Home And went into house and came back Out 5 mins Later And not start.Went into Arch...
1994 Chevrolet S10 Blazer Tahoe 4.3L transfer case VIN: 1GNDT13W5R
This vehicle is driving us crazy, the vehicle came in w/4x4 inop and the encoder motor was not working, so we replaced it and thought we were good because it worked fine after that, then a couple of months later 4x4 inop. we found tcc module hot, then checked ...
1994 Chevrolet S10 Blazer Tahoe 4.3L Surge, Stall VIN: 1GNDT13W3R
After a cold startup ok until warms up then on sligt acceleration with or whithout load It feels like the RPM limiter comes in at about 1700 rpm,but pass 2000 rpm the truck runs good,sometimes it stalls and its hard to start.
1996 Chevrolet Corsica 2.2L Stall VIN: 1G16D5542T
Customer states this vehicle will stall at stop signs intermittantly. I've driven it a dozen times and it never stalls for me (surprise). On the first visit we discovered one fuel injector was different than the rest and that one cylinder was running rich. Tha...
1996 Chevrolet K2500 Suburban LS 7.4L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 3GNGK26J5T
thank you in advance. '96 7.4L suburban running rich. both codes (p0172, p0175) checked fuel pressure regulator and its not leaking. fuel pressure good (54 psi). performed injector balance test found #6 bad (letting out too much fuel, by about 10 psi) so i rep... Trouble codes: P0172, P0175
1997 Chevrolet C1500 Cheyenne 5.7L converter VIN: 1GCEC19R3V
would flag p1870 code when hot.clear code would drive ok,normal shifts.installed reman valve body with updated valve.still get code and now notice flare up between 1-2 shift.all other shifts ok.suggestions?
1998 Chevrolet Venture 3.4L system inop. VIN: 1GNDX03E9W
Hi friends. we have this 98 venture with abs and trac. controll indicator lamps on, scanned for codes and found a multitude of them, here goes, c-1256 lf mtr ckt open.c-1344,lft. channel will not move. c-1345, rt channel will not move.c-1347,lft tcs mtr free s...
2001 Chevrolet Tahoe 5.3L compressor VIN: 1GNEK13TX1
We've installed all the new parts listed above, after flushing the system for 2 hours. The truck blowed cold for 3-4 hours, turned the vehicle loose to the customer, only for him to return shortly after, system blowing hot. After checking the truck, found that...
2002 Chevrolet Express 1500 4.3L Misfire VIN: 1GCFG15W62
Hello fellow techs, I have this Chevy express 1500 that is starting to drive me nuts. This vehicle came in with no power under a load and missing, I remove the upper plenum to check the injectors, i had no ijector spay out of cylinder # 2 and 3, #4,1,5 have we...
2003 Chevrolet Tahoe LS 5.3L booster VIN: 1GNEK13303
Hello, This vehicle came in for a intermittent brake pedal condition and a message in the information center that said service brake booster. I was able to duplicate the concern. The pedal goes to the floor and the message is displayed in the message center. ...
2003 Chevrolet Astro 4.3L Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GNDM19X63
this is a long post and a weird problem.. loss of power at 60 mph. cant go over 67mph. vehicle has sporatic misfires under moderate load (after wot) and mostly on cyl #2! also has occasional mis under heavy load at max speed around 60mph! the vehicle actually ... Trouble codes: P0101 (maf circuit), P0300 (random misfire)
1998 GMC Jimmy Envoy 4.3L instrament panel VIN: 1GKDT13W8W
This Jimmy came in with intermediate hard start issue.Tested fuel pump first and found a problem and replaced pump.After pump replacement truck would start and die over and over again.Did passlock relearn and truck starts, but after a few seconds of running th...
2001 GMC Savana 2500 4.3L Misfire, MIL Lamp on VIN: 1GDGG31W21
Thanks in advance for all your help. I have searched the forums to no avail. This is a 2001 Savana cutaway with a 10-foot box (old Penske unit.) It idles somewhat roughly, but won't stall. I had thoroughly checked all the wiring from the PCM to the coil, and i... Trouble codes: P0351 (Ignition coil 1 Primary/Secondary circuit)
2002 GMC Envoy SLE 4.2L MIL Lamp on VIN: 1GKDT13S02
hi iatn people this gmc has a p0442 small evap leak code. i have smoked it every wich way possible and check the vent and purge valve by jumpering and checking it with the snap on scan tool tank pressure is moving up with pressure and down with vacuum the same... Trouble codes: P0442
1991 Oldsmobile 98 Regency Elite 3.8L Intrument Cluster, engine controls VIN: 1G3CW53L8M
This is a olds with all the bells and wissles. The problem is that the instrument cluster reads 9.5 volts for the charging system. Shortly after the cluster reads this warning, the car will die. The alternator is new and outputs a steady 13.5-14 volts while th...
1989 Pontiac Firebird Formula 5.0L Excessive Emissions, No Start, Poor Idle Quality, Surge, Stall, Misfire VIN: 1G2FS21F1K
this one is for the f body guys .the car came in running not great but good, owner did not think it would pass im 240 emm. test. so we took it up to get tested to get the numbers if it failed because we do not have a 5 gas any. the car passed. great numbers, g...
2002 Pontiac Grand Am SE 2.2L No Start VIN: 1G2NE52F32
intermitten no start. scanner reads cam & crank signals rpm signal present also shows fuel pump relay energised .no power to pump even with relay energised. vehicle has passkey=2 . security lihgt is not flashing as if system active . note symptom occured after... Trouble codes: U1000
2002 Saturn Vue 3.0L No communication VIN: 5GZCZ43D12
Hello techs. Vehicle fails NYS OBD inspection for no communication. 2.2 4 Cylinder. Has 12v on pin 16 and grounds on 3&4 of ALDL. Pins 2&7 are good to ECM. ECM replacement next? Any thoughts? Thank You

Fixes & Summaries for GM
Fix/Summary Answers
1989 Chevrolet Camaro Iroc-Z 5.7L Poor Idle Quality, idle-hunting closed VIN: 1G1FP2186K
Howdy everyone! I finally fixed my Camaro! Thanks to all of you who were great helpers! I checked the resistance at each injector and 4 of 8 were below the base 16 ohms. Should have done that from the get-go! Also while I had the fuel rail off I rebuilt the pr...
1994 Chevrolet K1500 5.7L Poor Idle Quality, Hesitation, Poor Fuel Economy VIN: 2GCEK1919K
thanks all well looks like the customer is going to get a rebuilt engine and put it back to oem. haven't spent any more time on it since he's not willing. and to answer some of the questions : yes the truck ran fine before the "upgrade", and he had a turbocit...
1995 Chevrolet S10 2.2L blinkers VIN: IG4F8027HF
i fixed with changing blinker switch .but before that after a long search i found that the broken off hazard switch was the colprit ,changed that to.all is good .MANY THANKS TO EVERYONE WHO REPLYED.
1996 Chevrolet K1500 6.5L MIL Lamp on VIN: 2GCEK19S8T
well guys, i got it. but first here's some info on this system, when the turbo builds boost the egr is shut off and the desired egr % is 80% weird!! vacuum at egr is 7" at idle 20" driving with lite throttle is right. what the problem was is an intermittent... Trouble codes: P0406.
1997 Chevrolet Blazer 4.3L Ignition Switch VIN: 1GNDT13WXV
Hi Guys, I received 11 replies and most of you said it was the switch in the floor shift assembly. This switch is serviced by replacing the whole shift assembly WOW!!. The customer declined to spend the money on this job. He opted to carry a small screwdriver ...
2001 Chevrolet Blazer LS 4.3L Hesitation, Cuts out VIN: 1GNCS13W11
well i dropped the ball on this one. As many of you suggested i pulled o2 sensors and test drove all power was back. I then cut the pipe to look at converter and yes it was plugged. Thanks to all who replied
2004 Chevrolet Silverado 1500 4.8L No Start VIN: 1GCEC19V04
I would like to thank all those who replied. Three suggestions refer to the vehicle theft system, one to the fuel pump and one for the frame ground. The customer has yet to return the vehicle for additional service. I have checked the frame ground and I am lea...
1998 GMC Sonoma SLE 2.2L Stall VIN: 1GTCS194XW
Hi Guys, Thank you for everything. Found a combination of the check valve bad. Installed an inline check valve. Also had a leaking fuel injector. Thank you gain.
2002 GMC Sierra 2500 HD SL 6.6L No Start VIN: 1GTHK23142
the injector warrenty is for internal injector failure returning fuel to to tank (no or low rail pressure)the coverage on that was increased to 200,000. i inspected the line out of the pump and pump outlet, no metal debris/did not pull the injectors, i figured... Trouble codes: P0087 (rail pressure low), P1093 (low system pressure).
2002 Pontiac Grand Am GT 3.4L Lack of power VIN: 1G2NV52E82
I replaced the converter and the secondary o2 sensor, reset the computer and road tested. All is fine, as to why the converter went bad, well, it does have over 100k on it and it does lose it's efficiency after awhile. I'll [...] this one fixed, and move on. Th... Trouble codes: P0420.
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