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Prev Professional Automotive Repair Technical Discussions for April 18, 2006
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Open Help Requests for GM
Help Request Answers
2000 Buick Century Custom 3.1L keyless entry VIN: 2G4WS52JXY
This car came to shop with the keyless entry not working. The dealer diagnosed this vehicle needing a keyless entry receiver. I have alldata system It tells me that it takes .6 hr to change. But the instructions says to pull the dash pad. This looks to be very...
1997 Cadillac Catera 3.0L dome and dash lights VIN: W06VR52R0V
Customer complaint is no dash lights, and interior lights stay on. I'm thinking possibly a bad D.S. door latch for the interior lights and something else for the dash lights, but I wanted to ask you guys first before I got elbow deep in it, is there a common f...
1978 Chevrolet Camaro 5.7L race car overcharging VIN: 1JTRN5522R
Hi I drive a 78 Camaro at a race track they want a kill switch to cut off everything including the battery, alternator, guages, if i put the kill switch on either side of the battery and the car is running it still runs I think the alternator is fielding or fe...
1993 Chevrolet Pickup K3500 6.5L speed sensor
if you are in 3rd gear the motor is running at about 2000rpm the input sensor is running about the same but the output sensor is running about 1000rpm the truck will set a code 85 after you drive witch is a undocumented ratio then the tranny goes in too hi lin...
1994 Chevrolet G30 Sportvan 7.4L backfire VIN: 1GAHG39N1R
Thanks in advance for the help. I'm working on this 15 passenger van for our church, the parts and labor are on me! But it's got me stumped. Here's what's going on: Under moderate to heavy acceleration under load, there is a lack of power and backfiring throug...
1995 Chevrolet Lumina 3.1L Pass Key VIN: 2G1WL52M3S
This car is a intermittent no start. When fault occurs, there is no ground from Theft Deterent Module (TDM) to Start Enable Relay (SER). Otherwise, there is a ground present. My question is this. Should there be a ground from the TDM to the SER when the key is...
1997 Chevrolet Blazer 4.3L 1-2 shift 4th gear VIN: 1GNDT13W3V
Car came in for a fluid change made my tech drive it, shop policy here. After fluid anf filter change, od drive would kick in and out intermittantly. Changed the PWM and 3-2 downshift solenoid drove ok for a about 20 miles then i lost 1st and 4th gear all toge...
1997 Chevrolet Blazer 4.3L alternator VIN: 1GNDT13W5V
hello all in iatn country. first thanks for all who respond. i have this vehicle in for the first time with the #4 fuse blowing. customer has stated this problem has been going on for months and is has replaced the alternator 2 or 3 times now and is tired of r...
2002 Chevrolet Trailblazer LS 4.2L reduced power VIN: 1GNDT13S72
Vehicle has same symptoms as reduced power mode. Incorrectly calculates engine load demand at 100% when trying to accelerate motor this occurs both in park and in drive mode with max speed of 20mph. The PCM has been changed. Fuel delivery system has been verif...
2004 Chevrolet Impala 3.4L No Start VIN: 2G1WF52E84
When the car does'nt start it has no spark. There is nothing consistent other than leaving it cool off for a bit then it starts again. It will run once its started and will not leave you stranded. I have wiggled the harness, repaired 1 ground and inspected the... Trouble codes: P0443, P0645, B1440, B2587, B2964, B3128
2004 Chevrolet Aveo 1.6L enige oiling VIN: KL1TD52684
We double checked oil filter aplication, replaced filter and oil to be sure they were correct, no change. Hooked up oil pressure guage, when warm, 5 - 15 psi. Cold start I had up to 40 psi at idle, but would drop on rpm increase. Also, preasure would fluctuate...
2001 Geo PRIZM 1.8L MIL Lamp on VIN: 1YSK52851Z
DTC P1349, Intake Camshaft (CMP) Position System code occurs intermittently always around 30-40 mph usually 35-45% throttle. Vehicle has new CMP actuator and we tested it on vehicle w resistance test OK and applied current causing engine to stumble and stall a... Trouble codes: P1349 (intake camshaft position cmp system)
1994 GMC K2500 Sierra SL 6.5L no acceleration VIN: 1GTGK29F9R
vehicle will intermitantly not accelerate, could happen when just started or while running, no specific condition causes the problem. vehicle will idle fine. a restart normally results in a return to normal operation.due to the intermitant nature of the proble... Trouble codes: 23 (accelerator pedal posotion 1 fault), 27 (app 2 fault), 84 (app fault)
2003 Hummer H2 6.0L door ajar warning VIN: 5GRGN23U43
Thanks in advance for your valuable time and hello from Katrinaville. What my customer brought to me is a H2 with random right rear door ajar warnings. Of course the suspension drops and it drives him crazy. Well,he's anal already and this hits a nerve. Could ...
1991 Oldsmobile Cutlass Ciera S 3.3L No Start VIN: 1G3AJ54N2M
Ok guys...I've had 10-15 minutes to glance at this car today. Five techs have looked into this malfunction since the car was towed in Saturday, and now I'm number six !!! OWNER states, "driving along just fine, turned on A/C, engine died...won't restart" No ...
1992 Oldsmobile Cutlass Cruiser S 3.3L Poor Idle Quality, Stall VIN: 1G3AL54N3N
this vihicle came in for an intermittent stalling at idle. i rode tested and was unable tro duplicate concern. i checked injector resistence-all good, checked for codes-none, checked plugs-worn, cleaned throttle bore and iac pintle only.i talked to the custome...
1996 Oldsmobile Bravada 4.3L MIL Lamp on VIN: 1GHDT13W9T
Vehicle has been setting intermittent above codes for 2 years. Trouble codes: P0440, P0442
1999 Oldsmobile Intrigue GL 3.8L ac control head/drl lights VIN: 1G3WS52K4X
2001 Oldsmobile Alero GL 2.4L No Start VIN: 1G3NL12T4I
car towed in no start, owner replaced fuel filter, has good fuel pressure, good spark, no pulse to injectors. the alternator looks new, customer did not comment on replacement. codes po621,p1632 present. no check engine lite. Had a no start after alt replaceme... Trouble codes: P0621, P1632
1999 Pontiac Firebird 3.8L Hesitation, MIL Lamp on VIN: 2G2FS22K5X
T body makes a racheting noise when gas pedal is moved and sets a p1221 instantly. Will make this noise for 10-15 seconds at a time.Noise is throttle mtr. in the t body. Does the same when key is turned on or off. replaced/reflashed pcm, Installed a Used t bod... Trouble codes: P1221
2003 Pontiac Grand Prix GT 3.8L engine fasteners VIN: 1G2WR52133
Hi group, Looks like I got myself in troble after I hopped up my GTP a bit. I'm now replacing pistons after breaking two(#1&4). Qusetion is, the rod bolts are torqued like a torque to yield type bolt. Can I reuse the rod bolts safely or not? By the way, they w...
2003 Pontiac Grand Am SE 2.2L pump VIN: 1G2NE52F33
Hello all, We received this Grang Am in with a noise on hard turns. We checked and the noise was travelling the column, and it is a knocking noise. From under the hood if you hold the steering against its stops the engine is making a knocking noise where the ...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac Seville STS 4.6L Electronic VIN: 1G6KY5493W
I wanted to give this one some time in the field before posting to make sure it was fixed. As most who responded suggested, vehicle only had about 1.6 Lbs of refrigerant(2.0 lb capacity system.) I evacuated and recharged with 2.0 lbs and 20 minute test drive s...
1990 Chevrolet C1500 Cheyenne 5.7L slow start VIN: 2GCEC19K3L
I checked the rpm signal from the distributer and it was weak until you let the engine spool up and then it sent a kinda weak signal to the ecm.I went ahead and changed the distributer and gave it a tune up .Now it might turn over twice(barly 1 second)and rumb...
1992 Chevrolet Lumina 3.1L Stall VIN: 2G1WL54TXN
we replaced the fuel pump filter and 1 week ago and have not heard from out customer. i believe we have resolved the problem
1993 Chevrolet K2500 Cheyenne 6.5L Upshift, Downshift, No Output Reading VIN: 1GCGK24F9P
My nightmere is over. We pulled the whole wiring harness for the Engine and Transmission. What we found is the wire going to the Output Sensor was broken with a couple of wires still attatched. We knew it was a wiring problem but after so many of you were talk...
1994 Chevrolet Lumina APV 3.8L Excessive Emissions, MIL Lamp on VIN: 1GNDUO6L6R
Well thanks to Erick from califonia he told me to put a 1 in front of the codes and that put me right on track. The 1640 is a evap purge solonoid driver failure,the 1670 is the cooling fan circuit quad driver problem. I could not find a problem in the evap sol... Trouble codes: 640 (no description), 670 (no description).
1995 Chevrolet Blazer 4.3L Master cylinder VIN: 1GNDT13W5S
Thank you all for the help, The information I received on how to diag. the abs pump was the most help. I pinched all the hoses, eliminating wheel cylinders and calipers and the problem was still there. I then plugged the master cylinder where the lines go in a...
1998 Chevrolet Tahoe LS 5.7L assisted steering VIN: 1GNEK13R6W
Well, thanks for the help guys, I spent some more time on this and scoped the hand wheel position sensor and found several flat spots on it. But to my dismay the customer didn't want to fix it. So I at least know what to check right away next time. My only que...
1999 Chevrolet K1500 Suburban 5.7L MIL Lamp on VIN: 1GNFK16RNX
Bear with me here, this might get lenghtly. I am not done with the vehicle, I am determined to find out what is wrong. Here is what I know so far, which isn't much different from before but I'll cover it more thoroughly. Let me start by saying that the vehicle... Trouble codes: P107, P108, P106, P107, P404, P101.
1999 Chevrolet S10 2.2L Hesitation, lack of power VIN: 1GCCS144X8
thanks everyone for the help and support. I ended finding out this vehicle had and aftermarket alarm system that had a broken reset switch. it also had a battery with a bad cell and kept dying.this guy also had a verry big amp so every time this system bumped ...
2003 Chevrolet Suburban 1500 LS 5.3L electric windows
thanks for the many thoughtful responses, several of which pointed out what i had missed when first looking at the wiring diagram. the left side doors have their own circuit breaker, located in the fuse panel under the left of the dash. armed with this knowled...
1999 GMC Yukon Denali SLE 5.7L Unknown VIN: 1GKEK13R7X
well i feel sort of stupid on this one,the vibration turned into a squeak and led us to the fix. this yukon has auto trac 4wd and i never thought about how they could engage this when driving but there is a preload in the clutch pac of transfer case that keeps...
1987 Pontiac Fiero GT 2.8L streeing stability VIN: 1G2PG1192H
Thank you all for the replies. We did get a chance to recheck this car. We found both upper ball joints were a little loose and the right front shock was leaking. The customer had a warranty from another shop on the shocks. He said he was going to try that fir...
1998 Pontiac Grand Am GT 2.4L rack?? VIN: 1G2NW12T2W
Well the middle man messed this one up.This was an old ladies car that the neighbor brought to me with a bind to the left.That was verified on a short test drive.The rack was replaced with a reman and sent to the owner.A couple days later we have the same comp...
1993 Saturn SL2 1.9L Reverse VIN: 1G8ZK5578P
i thought vehicle was fixed but got a call it was still acting up intermitantly.i rececked mainshaft torque ok did voltage drop on ecm to selenoid harness and replaced all engine mounts.coolant temp sensor reads correct throu scanner but i am going to replace ...
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