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Prev Professional Automotive Repair Technical Discussions for August 23, 2006
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Help Request Answers
1996 Cadillac DeVille 4.6L Misfire, MIL Lamp on VIN: 1G6KD52Y2T
Hell Friends, Iíll give you a little history on this reman engine first. We replaced the engine due to a chronic overheating problem with is consistent with the 4.6 Northstar. We didnít want to get involved in head gaskets so we told the customer the only way... Trouble codes: P0300 (Random misfire)
1998 Cadillac Seville STS 4.6L stability system VIN: 1G6KY5499W
Hi Folks The service stability system flashes on the information center but, there are no codes. Not sure where to go from here.
2002 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54YX2
Hi all! Got me a Fine Cadillac car here with a yeller light on that looks like a bad drawing of an engine! My 'should have kicked it to the curb years ago' scan tool says it's a P1860 "See service manual". Since I don't have a service manual handy, I'm buggin ... Trouble codes: P1860
1987 Chevrolet Nova 1.6L Altrnator VIN: 1Y1SK5141H
This is my daily driver for work. I arrived at work and charge lite came on saturday morning.I raised hood and smelled burned wires and smoke from Alt. area. I suspected burned out alternator. Charge showed 12.43 volts I replaced Alternator, ran car two minute...
1992 Chevrolet Astro 4.3L abs system VIN: 1GNE19WGNB
Okay fellow Techs, we replaced the ehcu with used unit due to codes # 62 & 63 but only after inspecting and cleaning grounds for unit clearing codes and retesting for codes all diagnostics for codes # 62 & 63 with good powers and grounds to unit call for repla...
1995 Chevrolet Tahoe 5.7L Brake control module VIN: 1GNEK18K9S
Hello everone, I have a 95 tahoe come in the door with brake issues. Customer left the park brake on after leaving the boat ramp for several miles. The rear brake shoes were scorched and wheel cylinder dust boots melted. Customer mentioned ABS light had been o...
1995 Chevrolet C1500 Cheyenne 5.7L slave cylinder &clutch master cylinder VIN: 2GCEC19K1S
hello,guys. problem : have been trying to bleed this system many times at the slave cylinder with another tech at the clutch pedal( pumping), until we can shift thru all gears with out clashing or binding.but every time we feel is time to test drive & drive tr...
1997 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY22GSV
hello gm techs i have this corvette and the climate control panel and blower motor stop working intermittently. check engine light comes on. all codes appear at the same time which led me to believe that this was definitely a power problem. i finally got it t... Trouble codes: P0134 (low ho2s activity), P0135 (heater circuit bank one sensor one), P0141 (heater circuit bank one sensor two), P0155 (heater circuit bank two sensor one), P0161 (heater circuit bank two sensor two)
2000 Chevrolet Blazer LS 4.3L transfer cas VIN: 1GNDT13W0Y
have this s-10 blazer with a code b2725 (atc mode switch circuit malfunction)read archives on this code & found that the switch on dashboard goes bad alot.checked switch as per alldata found it out of specs .replaced switch as to no avail.i hooked up a genysis...
2001 Chevrolet Venture LS 3.4L abs VIN: 1GNDXO3E71
the vehicle has a abs light, a traction control light,also service traction control system.our snap on scanner shows no codes. We tried our scanner on another 01 and also got no data ,but on 02 etc. we get data. When we put our foot on the brakes the hazard li...
2001 Chevrolet Blazer LS 4.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1GNDT13W21
2001 Chevrolet Impala 3.8L a/c VIN: 2G1WF55K81
this is a police vehicle, intermittently the charge light comes on and the a/c goes off, upon testing the alt is still chargeing 14v or more. we scanned the computers and found codes: U1064c and P1626c, but have not found any diagnostic trees. any help would b...
2002 Chevrolet Silverado 2500 6.0L all shifts VIN: 1GCHK24U72
I recently rebuilt this 4l80e trans due to no forward or reverse when hot. When I disassembled it I found a broken spring on the 3rd accumulator piston. Has anyone seen this? I went ahead and replaced the broken spring and all steels, fibers, pistons and seals...
2003 Chevrolet Express 2500 6.0L door locks VIN: 1GAGG25U13
All the door locks on this van will activate intermittently. We have experienced this problem while driving, koeo, and with the key out of the ignition. Usually the doors will unlock and then continue to try to unlock, but at times they will lock and do the sa...
2003 Chevrolet Silverado 1500 5.3L engine VIN: 1GCEC19T83
truck had water in oil.no steam out of ex.no cyl. missfire codes,runs great.no co2 in radiator using blue test fluid,all head bolts tight,&in good shape.no oil in radiator,(may rule out oil cooler)reassembled with new head gaskets after having cylinder heads m...
1991 GMC Safari SLE 4.3L Hesitation, Surge VIN: 1GKDM19Z8M
Vehicle will run very rough when accelerating from a stop when hot. Runs fine when cold or cruising on the highway. Problem seems to get worse the hotter it gets, also will surge badly sometimes under part throttle. Fuel pressure and ignition system look good,...
2002 GMC Yukon Denali 6.0L Surge VIN: 1GKFK66U52
This truck surges and/ or boggs down when accel in overdrive. If placed into 3rd it accelerates normally, but when you come to a stop or accel from a stop it feels like it shifts wrong, almost like slipping. Scanner readings look good. both TPs readings are cl...
1994 Oldsmobile 88 Royale 3.8L No Start, Cuts out, Stall VIN: 1G3HN52L5R
help, vehicle came in on a hook with a no start. I found no spark and no injector pulse, fuel pressure was ok. Found it had 3 codes po321, po341, po361. found that craqnk position sensor had no signal. replaced crank position sensor.It started and ran. vehicle... Trouble codes: P0321, P0341, P0361
1994 Oldsmobile Cutlass Supreme 3.4L theft deterant module VIN: 1G3WT35X2R
found problem to be faulty theft deterent module . will read key resistance but wont ground relay or send signal to pcm . customer is 82 yr. old man on s/s . cant afford module - 300.00 from dealer , any way to by-pass system so he can go to church and grocery...
1999 Oldsmobile Cutlass GL 3.1L MIL Lamp on VIN: 1G3NB52JXX
P0133 continually returns after intake gaskets were replaced. Minimal silicon usage and that was all "gray" O2 friendly stuff. In 400 miles since original work we replaced the original sensor that did have some reddish substance on it. It was replaced with a N... Trouble codes: P0133 (o2s1b1 slow response)
1999 Oldsmobile Alero GL 3.4L power windows, fan inop, door locks VIN: 1G3NL52EXX
here lies an olds alero that when it came in, the power windows were inop, door locks would actuate all by them selves and dash lights were inop. we checked all fuses and any under dash connections for tight fit, but all we found was that if you tap(ok, hit) t...
2000 Oldsmobile Silhouette GLS 3.4L Misfire VIN: 1GHDX03EXY
Van came in with antifreeze in oil, we origninally replaced intake gaskets. After approximatly a month it came back & it was overheating, so we had to replace cylinder head gaskets. Since than it has been back with po300 random cylinder missfire. We replaced a... Trouble codes: P0300
2000 Pontiac Grand Prix SE 3.8L MIL Lamp on VIN: 1G2WK52J71
Car came in with mil on. Pulled codes p1361 and p1362. No history of car ever starting hard or not starting. I have never seen these codes and did not find any history here or tsb's. Freeze frame says first failure was 12000 miles ago but mil was set 13000 mil... Trouble codes: P1361 (ic ckt not toggling or grounded), P1362 (ic 2 fault / ign bypass shorted)
1992 Saturn SC 1.9L Excessive Emissions VIN: 1G8ZG1479Z
thanks to all have a high co problem causing high hc have low intergrader 70 during acceleration when i pull evap line off at fuel tank fuel is present my question is is there any check valve or liquid seperator to control thisif i run car with hose disconnect...
2000 Saturn SL1 1.9L drl system VIN: 1G8ZH5282Y
Saturn Saturn tech got a good one.Drl system will cancel after certain sequense,(koeo ,drl on,ipc sign on in rnd32 ) (koer ,drl on ,turn headlight on ,ipc sign off).(koer ,drl on ,ipc sign off ,hand brake on ,drl off).(koer ,headlight on low beam,ipc sign off)...
2006 Saturn VUE 3.5L Propeller shaft VIN: 5GZCZ63426
My Girlfriend's vehicle makes a rattle at varying speeds. Sounds like a possible loose shield. It occasionally shudders rather badly and it acts as if your driving a manual trans and not engaging the clutch enough but happens at speeds of 20 to 35 mph. The Vue...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Century Custom 3.1L a/c compressor VIN: 2G4WS52M7V
Ta Da!! You guys are great. It was the coil heating up. After rigging up some wiring and gauges to where I could see them while driving it took about fifteen minutes when I actually seen the amps climb to over thirty amps. It seems that the extra pull to k...
1998 Buick Century Limited 3.1L Vibration VIN: 2G4WY52M3W
Sorry I can't offer any fix on this vehicle as the customer declined any further repair. We did narrow the problem down to the transmission as far as we can tell without doing any more work. We had a reply to try some shudder fix so we tried that but the probl...
1984 Cadillac Eldorado 4.1L Looses belt VIN: 1G6AL5788E
First of all thanks for the help. Because this problem only occurs in winter I don't know yet if it is fixed. Most of the help messages I recieved suggested spraying the air pump with a penetrating lube to try to displace water during storage and keep rust fro...
1978 Chevrolet El Camino 3.8L steering VIN: 1W80A8Z480
Thanks everyone who took the time to read and reply to this help request. We tried several of the suggesttions. None inproved the problem. The Alignment shop is giving up. They are suggesting that the customer bring the rig to me. They replaced all the ballj...
1995 Chevrolet K1500 5.7L Poor Fuel Economy, MIL Lamp on VIN: 2GCEK19K7S
it ended up being the aftermarket o2 sensors were too short and i think the connection was being lost there. i cut the connector out and soldered in wires and everything is good. thanks for all the replies Trouble codes: 13 (O2 Sensor open short or no good).
1998 Chevrolet Cavalier LS 2.2L battery light on VIN: 1G1JF5247W
I had recieved some good info on diaging this sytem. Thanks to Evan for your input.I took you advice and concentrated on testing the L terminal for 5v which I confirmed that I did not have. I tripple checked wiring which tested good.We decided to send the cust...
1999 Chevrolet K1500 Suburban 5.7L Rotors VIN: 1GNFK16R9X
Appreciate all the great responses, the majority indicated that using OEM parts seemed to be the best chance of smoothing out this bad boy Suburban for the long term. Everything else that has been done to it has left it braking smoothly, but only temporarily. ...
1999 Chevrolet Metro LSi 1.3L No Start VIN: 2C1MR2225X
Fix..Fix..We all. Ray, Pat, Bryan, and Ronald for there input and a big thank you to Jimmy Fix for the help on this one. Jimmy had one like this and found a corke oil pan gasket caused the Crank Sensor air gap to be out of spec. I did check but only at that ti...
2000 Chevrolet Silverado 1500 5.3L speed sensor VIN: 1GCEK19T4Y
Thanks to all that replied. It has been 2 Weeks now and no random abs activation. We replaced the bearing/sensors with Delco parts. I think my customer has learned a valuable lesson. Last I heard he was trying to get his money back from brand X for the afterma...
2000 Chevrolet Silverado 1500 5.3L fuel gauge message center VIN: 2GTEK19T7Y
Thanks to all. It was actually 3 seperate problems. the fuel sender fingers were broken. We replaced the fuel module to repair guage problem. 2nd was security and battery light flashing on message center... that was a bad cluster. swapped out a bone yard clust...
2000 Chevrolet Malibu 3.1L No Start, HARD START VIN: 1GND52J8Y6
Well first I want to thank all that took the time to reply to my post . Many hit the nail on the head, a shorted module body ecm sdm radio anti theft. Who would have thought an air bag module could cause a no start ? Basically This vehicle was wrecked before a... Trouble codes: P1626 (loss of class 2 data).
2001 GMC Sierra 2500 SL 6.0L Misfire VIN: 1GTGK29U91
Thanks again for all the replies everyone. Sorry for the delay in closing, but it seems just updating the post to let everyone know we haven't gotten it back into the shop yet is frowned upon. Just got it back in this morning, did a full injector cleaning an...
1997 Pontiac Trans Sport 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GMDU06E8V
I cleaned the injectors and replaced the rf wheel bearing rf wheel speed sensor intermitant.Motor idles alot better now and after 100 miles put on it no lites came back on.Tryed to get the owner to ok replacing bosch plugs with ac he declined the work and said... Trouble codes: P0300.
1999 Pontiac Grand Am SE 3.4L fuel gauge VIN: 1G2NE52E1X
The customer refused to let me drop the tank at first. Then after four hours of testing, I drop the tank and found the problem. When the unit was installed they knocked off the arm on the sending unit thats why it was reading the way it was. Almost everyone sa...
2000 Pontiac Sunfire SE 2.2L engine VIN: 1G2JB1241Y
Thanks to all replys, this baby is fixed! Chris from AL gave a nice explaination of how this system works, Robert [...] also gave some insight into the crank and cam sensor relationship, Serge got me thinking about the lack of communiction between modules. Here is...
2001 Pontiac Aztek 3.4L differential? VIN: 3G7DB03E91
Many little things added up to a fix. We had the ECM reflashed but that did not help, removed the rear drive shaft assembly and inspected the splines, rear diff, and transfercase-all seemed good. The fluid in the rear diff was awfull so we changed it and the t...
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