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Prev Professional Automotive Repair Technical Discussions for April 23, 2008
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Open Help Requests for GM
Help Request Answers
1994 Buick Roadmaster 5.7L engine VIN: 1G4BN52P9R
big buick roadmaster ,car overheats after 20-25 min running ,driving or running in shop does not boil over ,temp goes to 230 by dash gauge, monitor reading or by infra red gauge ,this is a reverse flow eng ,water pump checks ok ,checked thermostat in can ok ra...
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1993 Cadillac Fleetwood 5.7L Excessive Emissions VIN: 1G6DW527XP
originally had ground to egr solenoid but was not getting out of solenoid to operate egr valve.technician then checked egr valve stand alone and also was weak. replaced egr solenoid and replaced egr valve with new.then all of a sudden lost ground.tech then jus...
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1990 Chevrolet C1500 Cheyenne 5.7L Surge, Stall VIN: 2GCEC19K8L
ran tests had egr code but no service light, replaced egr sol. due to age. egr valve acts up with engine warm or hot, will not open cold. just off idle, barely push gas egr opens, engine dies, or rough idle. egr sol. didn't help. cust. had replaced t.p.s, i al...
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1993 Chevrolet Corvette 40th Anniversary Edition 5.7L No Start VIN: 1G1YY23P8P
vehicle towed in no start.customer stated ran great until parked for winter,went to start last week and dead battery.customer replaced battery and would crank but not start..check all basics and found code 41 est/found spark and injector pulse for first 3 seco... Trouble codes: 41 (est open or shorted)
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1996 Chevrolet S10 2.2L Excessive Emissions, MIL Lamp on
Vehicle runs clean at idle, and high rpm, on startup shortly after going into closed loop.O2 switches fine,injectors vary 1.0ms to 2.3ms,short fuel trim 0.Emissions basically 0. After a few minutes short term starts subtracting fuel gradually to -18%,O2 starts... Trouble codes: P0172
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2000 Chevrolet C3500 7.4L Fuel Gauge VIN: 1GBKC34J5Y
I just installed the transfer pump for the rear tank not suppling the front. I also just replaced the balance module. I believe I did all the test steps 4 months ago when truck was in here and customer declined replacing the module then. It does not seem the b...
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2001 Chevrolet Prizm 1.8L cooling fans VIN: 1Y1SK52881
I have a prizm with no cooling fans when hot or a/c on. Everything else on the vehicle works properly (a/c works). All fuses are good except: No power to 30amp RDI fuse. No power to 30 amp CDS fuse - this fuse actually is grounded but not blowing! I am trying ...
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1999 GMC Yukon Denali SLE 5.7L No Start VIN: 1GKEK13R0X
hI guys.Have this truck that someone install this motor in it.The truck will not fire up unless you put gas down the throttle.Once it is started it idles fast.when you are trying to start it the iac is at 168.The ect sensor is in spect.this happens every time ...
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2006 GMC Envoy XL Denali 5.3L starter VIN: 1GKET66M06
hello to all , i have this 06 gmc denali that wont crank some times . truck came from another shop and they installed a new starter but did not fix the problem . sometimes it will start and sometimes it will not but if you let it sit for 10-15 mins it will sta...
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1970 Oldsmobile 442 455CID Poor Idle Quality, Misfire VIN: 344670M371
this problem is likely headed for the older generation of techs, this is not to say that a younger tech cannot help me because one thing i have learned in this buisness is that if your humble enough you can learn from everyone.this 442 has an original engine b...
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1990 Pontiac Grand Prix LE 3.1L low fuel lamp VIN: 1G2WJ54TXL
Attention Pontiac gurus. The low fuel lamp always stays on even though the gauge is reading correctly. We took a SWAG(scientific wild assed guess)and replaced the sending unit in the tank.No dice. The wiring seems to be ok. Anyone have any ideas or could share...
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2002 Pontiac Firebird 3.8L MIL Lamp on VIN: 2G2FS22K52
CAT went bad in Sept. 07 replaced with after market cat approx. size of honey cone 4" dia. by 10". 2 weeks ago came back with 02 sensor code responsing to slow and it was so we replaced with new. After replacing with new 02 it lasted 7 days it back again thi... Trouble codes: P0420 (cat ineffeincy)
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2004 Pontiac Montana 3.4L starter operation VIN: 1GMDU03EX4
Good day people. I have this 04 Pont Montana and I'm trying to program an extra key for it. The vehicle came to me a few days ago with the security light flashing on the dash. Had a code for VTD ( vehicle theft deterent) in learn mode. Preformed key relearn. O...
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Fixes & Summaries for GM
Fix/Summary Answers
1990 Cadillac DeVille 4.5L Driver Info Center, A/C Control Panel VIN: 1G6CD5334L
Many thanks to Glen and Alfred. Also would like to thank everyone who responded. The vehicle has a bad A/C control head. When I unplugged it the IPC came back...
7
1998 Cadillac DeVille limo 4.6L rear wheel bearings VIN: 1GEEH90YXU
Thanks to everyone who took the time to respond. I was a little concerned because the parts that Charles posted were for a 97 and mine was a 98. As i sped read down and saw the RW20-61 I thought it was another bearing number, not a hub as Charles had earlier m...
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2000 Cadillac Eldorado ESC 4.6L MIL Lamp on VIN: 1G6EL12YXY
Thanks to all who replied.As it turns out,the new fuel pump that was installed that didn't provide the specified amount of pressure was just as bad as the original.It let the ck. eng. light stay on. I replced the fuel pump with a delphi pump which produced ... Trouble codes: P0171 (bi lean), P0174 (b2 lean).
25
2003 Chevrolet Malibu 3.1L theft deterrent sys. VIN: 1G1ND52J13
thank you to all who responded to my request for help, my problem was faulty ignition switch, the dealer covered under warranty for me, also the feed voltage from the bcm was an issue because of a poor connection at the plug.
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1995 Geo Prizm LSi 1.8L No Start VIN: 1Y1SK5280S
Well, thanks for the replies but while I was watching the primary ignition pattern the car decieded to fix itself and wouldnt act up again! The only thing I can figure out is maybe when I was back probing I may have improved a connection somewhere (I suspect a... Trouble codes: 12 (No distributor signal is inputed to PCM), 13 (Crank signal is not inputed to PCM), 14 (ignitor signal from ignitor is not inputed to PCM), 24 (IAT input at PCM open or shorted).
3
2002 GMC Savana 1500 4.3L 3-2 downshift VIN: 1GTEG15W92
THANKS FOR ALL THE REPLIES .TO START OFF AFTER CHECKING WIRING ALL CHECKED OK AGAIN . WENT ON ROAD TEST WITH METER HOOKED TO 12 SUPPLY SIDE AND WATCHED TO SEE IF VOLTAGE DROPPED BUT IT DIDNT . RETESTED WITH TECH 2 AND FOUND GROUND SIDE INTERMITTENTLY GROUNDING...
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2005 GMC Sierra 1500 5.3L loss of power VIN: 1GTEC14255
Morning everybody !!! thanks for the replies, the problem was the throttle body assm. when cold the #2 tps voltage would wander and if you shut down the motor and restarted it within a few minutes before it fully warmed up the code po2135 would set and the mes... Trouble codes: P0220 (tp sensor circut or app sensor out of range), P2135 (TP sensor 1 and TP sensor 2 correlation).
4
1992 Oldsmobile 98 Regency Elite 3.8L abs VIN: 1G3CW53LXN
Thanks to all who applied thier knowledge. I found the valve block intemmitently shorting the abs module. Replaced valve block and all is great.
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2002 Pontiac Aztek 3.4L radio-rear speakers, romote door locks, heated frt VIN: 3G7DB03E12
STEREO IS FIX FIXED AND WORKS GREAT, NOW HERE IS WHAT WE FOUND. THE PURPLE WIRES IN THE AMPLIFIER FROM THE RADIO CALLED REAR SPEAKER ENABLE WERE NOT SENDING A GROUND SIGNAL FOR THE AMP TO TURN ON THE REAR SOUIND. THE RADIO FADE CONTROLL WORKS FINE. WE NEVER ...
3
2000 Saturn LW2 3.0L MIL Lamp on VIN: 1G8JW82ROY
new ecm---all ok-they (IATN) insist that I write more but the heart of the matter is that the ecu fixed the problem Trouble codes: P1780 (trans /ecm communication), P1283 (app sensor).
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