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Prev Professional Automotive Repair Technical Discussions for July 11, 2005
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Open Help Requests for GM
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1990 Cadillac Eldorado 4.5L a/c,bcm VIN: 1G6EL1339L
Tech in our shop replaced compressor,drier,orifice tube,added 3oz of oil,evacuated & recharged system with r-12.Delivered car & 2 days later customer returned with code #b447=low refrigerant.Searched for service bulletins and found about updated prom for this ...
1990 Cadillac Eldorado 4.5L Cuts out, Stall, MIL Lamp on VIN: 1G6EL1333L
Hi techs, I'm having a bit of a problem with a 1990 Cadillac Eldorado Biarritz. Customer brought car in saying it would cut off while he was driving and had done so several times. Check engine light was on with codes 41 and either 52 or 58 i had forgotten and ... Trouble codes: 41 (CAM Sensor not reading), 52, 0R, 58 (Long-term ECM Memory code)
1990 Cadillac DeVille 4.5L MIL Lamp on VIN: 1G6CD5331L
Trying to blink out codes. Have done it many times on other GM's. I am jumping A and B terminals, like Chilton's says, codes will not blink. The MIL lamp self-tests at KOEO. Am I doing something wrong? I have 5 volts across A and B with my DVOM. Is there a com...
1997 Cadillac DeVille d'Elegance 4.6L altenator VIN: 1G6KE52Y8V
I have this caddy which the altenator is not charging.I tested for battery voltage at the main lug on the alt. and i do have battery voltage.I then procedded to check for voltage at the two wire connector on the alt. and I do not have any voltage on either wir...
1990 Chevrolet G20 Chevy Van 5.7L module VIN: 2GCEG25K3L
keeps burning modules tune up done dist replaced twice grounded dist too block problem intermiten no start long carnk time map sen replaced and fuel pump within last year
1990 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 2G1WL54T5L
vehicle ame into our shop with a no start condition. performed routine diagnostics and found that there was no injector pulse. determined that ignition module was bad and replaced. vehicle starts ok most of the time. seems to have loop at idle. checked for any...
1992 Chevrolet Lumina 3.1L Excessive Emissions, No Start, Poor Idle Quality VIN: 2G1WL54T8N
Hello everyone, The initial problem I encountered with this car is it would die coming to a slow stop. It would sometimes not start unless you slightly depressed the gas pedal. I replaced IAC and now it does not die, but sometimes it won't start, especially af...
1993 Chevrolet K2500 Cheyenne 7.4L No Start, Cuts out VIN: 1GKGK26N3P
Hello TECHS, Good day this one have me stunned.This truck would start and stall after about 20 minutes. When this happens there is no injector pulse. If you spray fuel into the intake it would start right up every time.I got my trouble tree and it directed me ... Trouble codes: 42 (EST Problem)
1994 Chevrolet K3500 Cheyenne 6.5L Hesitation, Cuts out, Stall VIN: 1GCHK39F2R
truck has had this problem for several months, intermittently while pulling a trailer on hot days ses and service throttle lights come on, speedo bounces erratically and engine loses power for only a few seconds, customer describes it as if you let off the acc...
1996 Chevrolet Blazer 4.3L No Start
Engine cranks good, engine has no spark or fuel. If I take a crankshaft position sensor and plug it into the connector with KOEO and sweep across anything that is metal I have spark and fuel. I looked up the hole to see what the reluctor was doing, I notice re...
1997 Chevrolet Malibu 2.4L Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on
The car have a MIL on with a P0507 code, the IAC valve was replaced and the condition still presented, the car starts fine but it stall out suddenly, all the vacum checks were performed and seems to be fine. Im going at 1500rpm and then I applied the brakes a... Trouble codes: P0507 (Rev Higher than expected)
1998 Chevrolet S10 LS 2.2L crank fuse VIN: 1GCCS1949W
It is blowing the 10 amp crank fuse. With a 20 amp fuse it starts fine. It is drawing just under 20 amps most of the time i have bypassed the prndl switch with the same draw still ocurring I then put power to the fuse right at the prndl harness with it unplugg...
1999 Chevrolet Prizm 1.8L can't fill gas tank
The car will not take gas when you try to fill the tank, it will only take about a quart at a time. i have dropped the fuel tank and checked everything. found that the tank is not venting properly, it has a on-board vapor recovery sysytem for refueling. when y...
1999 Chevrolet Malibu 3.1L Unknown VIN: 1G1ND52M0X
Can't get R/front or L/rear brakes to work. Here is the story. Customer brought car in and asked to have brakes bled. Why? Because husband replaced master and could not lift car to get at bleeders. We bled and bled(manually). Can't get RF or LR to hold. We do ...
1999 Chevrolet K1500 Suburban 5.7L Differential VIN: 3GNFK16R9X
there is a loud rattling noise I hear when accelerating from stop intermitten when turning (sounds like metal shield vibrating)the brakes had been done and drums not turned so I turned them, with no change(this is that lsd diff. one piece with governor)I read ...
1999 Chevrolet Astro 4.3L Drive Train VIN: 1GNEL19W0X
Hello fellow hairpullers. I have an astro van that has caused much grief to me and my shop owner. when accelerating, more often on hills, and not every time but most times, the van will start to thump and continue to do it while it drives. The noise is a vehic...
2000 Chevrolet Express 3500 6.5L Surge VIN: 1GCHG39FOY
hi everybody this is giving me some trouble under load this van accelerates fine for about 15 sec then drops off then picks up again for about 15 sec and continues to do this all the time as long as you are under load it idles fine starts fine we checked the c...
2000 Chevrolet Suburban 1500 5.3L Poor Idle Quality, Stall, Misfire, MIL Lamp on, Lack of Power VIN: 1GCEK142TX
Hey Folks! Posting this e-mail for a fellow shop. New customer to them. No signs of any work being performed other than maintenance. Vehicle just suddenly began to run poorly. It idles very rough, it will stall at times but restarts immediately,and has little ... Trouble codes: P0300 (mis-fire), P0343 (Camshaft), P0101 (Mass Air Flow), P1870 (Transmission)
2000 Chevrolet Prizm 1.8L Lack of Power VIN: 1Y1SK524YZ
Vehicle has a cold stall, lack of power when started cold. Not every time. Codes were cleared about a week ago. Have not come back. Has exhaust leak @ front pipe. Had to wait for clamp to come in. Will replace tomorrow. I didn't want to post until I had solved... Trouble codes: P0300 (Random Misfire), P0301 (Cyl 1 Misfire), P0302 (Cyl 2 Misfire), P0303 (Cyl 3 Misfire), P0171 (Fuel System Lean)
2001 Chevrolet Astro LS 4.3L Brake light/Hazard light VIN: 1GNDM19W21
This Astro has no brake light and no hazard light all times. I am not very familiar with these cars; does anyone have any idea what might have gone bad on this one? Any help tips advice would be appreciated. Thank you
2005 Chevrolet Equinox LT 3.4L body/suspension VIN: 2CNDL23S15
help help help i have an 05 chevrolet equinox awd model that has a rattle in the center of the vehicle when driving over bumps i have contacted gm tac and they have sugested the below repairs it is not noticable when on a smoothe highway at any speeds i can on...
2001 GMC Yukon XL 1500 SLE 5.3L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1GKFK16751
O.K. folks did a trip prepare on wifes Yukon on June 28 so we could drive it to Virginia on the 30th, decided to flush the cooling system while I had it in, Day before we are sposed ta leave she calls and says check engine light came on while getting on hiway ... Trouble codes: P1639, P0332
1988 Pontiac Firebird 5.7L prolonged cranking VIN: 1G2ES5G560
have done a full tune up if car is left for a long or short time it has a long crank and stumbles to start.. we fixed the code 33and 36 with replacement of mass air flow sensor and both relays(burn off and mass air relay) fowling the gm trouble tree diagnos...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick Regal LS 3.8L HVAC 10A fuse VIN: 2G4WB55KXY
Well, I'm calling this fixed- never found anything definite when I pulled the HVAC control out- may have improved a connection just unplugging it- anyway, the customer never complained of it blowing the fuse again- one reply said to check the wiring at the vis...
1989 Cadillac Eldorado 4.5L both abs & brake light on VIN: 1G6EL1154K
Thank you all for your help. We found that no pump pressure seems to override the light fuction in pulling codes. Gene from alabama sent me part #s for the parts we would need but there is no availabilty. At this point, I don't know what to do (any ideas?). Th...
1993 Chevrolet Camaro 3.4L Misfire VIN: 2G1FP22S1P
well guys i had to eat this one. found bad spark plug wire. funny i didt catch this on scope.
1997 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1W152MOV
folks I recieved 14 verry good replies and enough info to fix this bugger! Most everyone said I need to run a smoke test and find the leak in the fuel tank evap system. If I had a smoke machine I may have found it that way. Lt trim = long term fuel trim th... Trouble codes: P0440.
1998 Chevrolet K1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEK19R2W
we decided after looking at all the parts of this system and testing what we could to replace the pressure sensor on the tank because it was the only thing left that we couldnt get a reading from on the scan tool after removing it i ohmed it against the new se... Trouble codes: P0446.
2000 Chevrolet Prizm 1.8L MIL Lamp on, no communication VIN: 1Y1SK5289Y
Hello, Well thank you guys for your responses and help. I rechecked all wiring thinking maybe I had missed something. Also tried switching serial data line from pin 7 to pin 2 in the DLC because most GM vehicles communicate with the tech 2 via this terminal. A...
2002 Chevrolet Silverado 2500 HD 6.6L Cuts out VIN: 1GCHK23122
hello, to all, Cust.has not return for any further testing so I am closing this one out. thanks for the 5 replies,Ive kept all of the replies for and if I see this again. Ill let you all know what it took to fix it. thanks for the time. Adam
1999 GMC K1500 Suburban SLE 5.7L Misfire, MIL Lamp on VIN: 1GKFK16R5X
Well I finally found a sat. to spend fixing it. After revisiting the fuel pressure I ruled it out as on highway it would sometimes hit over 60psi but still be running bad. As a few of you suggested I looked into the intake manifold for leaks and just like Greg... Trouble codes: P0300.
2003 GMC Sierra 2500 HD SLE 6.6L mil codes VIN: 1GTHK29113
the vehicle in question is now fixed... thanx to the help from all who replied. i just had to replace the 4x4 switch and clear the codes. all is ok, no other client complaints at this time
1995 Pontiac Grand Am SE 3.1L No Start, Cuts out, Stall, MIL Lamp on VIN: 1G2NE55M3S
Another vehicle fix by this network. KOEO I started shaking and pulling the wiring harnesses, I notice near the transmission and starter area every time I pulled on the harness the fuel pump would cycle. With Engine running, engine would quit, pulling on the s...
1996 Pontiac Grand Prix SE 3.1L window motor VIN: 1G2WJ52M3T
Found out that problem was actually in the window switch. A previous tech had rivetted one of the wires which was causing the unusual problem. Replaced driver window switch all works perfectly. Thanks for all your help.
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