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Prev Professional Automotive Repair Technical Discussions for August 25, 2004
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Open Help Requests for GM
Help Request Answers
1997 Buick Riviera 3.8L no comms VIN: 1GAGD2219V
Hi everyone, This Biuck has no scan tool communications to any module other than the PCM, I get a serial data to EBTCM fault code stored. The ABS light is on all the time, there is some mention in the archives of the IPC affecting this bus system? Anyone got ...
1988 Cadillac DeVille 4.5L stating system VIN: 1G6C05155K
For the caddy boffs out there could you please helpeith this one i have worked out and checked the wiring tried another ECM and a new ignition switch I have power at the switch till i try and start the car then it will crank and no catch if i jump power to the...
1996 Cadillac Seville SLS 4.6L input sensor VIN: 1G6K5294TU
This car came to us i checked codes found input sensor code hooked up scanner and sure enough no input rpm checked for voltage at the trans conector witch was full of trans fluid i could run car and produce voltage cleaned conector and rechecked now i get rpm ...
1988 Chevrolet R20 Silverado 5.7L Poor Idle Quality, Surge, Stall VIN: 1GCGR23K1J
Greetings, I got this truck from another tech in shop.His last day was friday.I will try to give all info I have.I had no power on road test had fuel pressure but no volume new filter was plugged tight.Truck runs alot better. Stil have idle issue, found bad co...
1990 Chevrolet K1500 Cheyenne 5.7L Hesitation, Low power VIN: 1GCDK14KXL
Truck was towed in for a no start and cust also brought a new engine that he wanted installed because of low power. We found that the fuel pump was inop causing the no start. I replaced the fuel pump and got the engine running. Then I replaced the engine with ...
1991 Chevrolet Beretta 2.2L No Start, Stall, MIL Lamp on VIN: 1G1LV13G4M
This car came in for hard starting, stalling, and ses light on, code 42 est problem, ran flow for code 42 and at the end it said replace ecm, did that, didn't help, what i found is that during the hard start which is acually a prolonged crank that I have no in... Trouble codes: 42 (est not switching high or low)
1995 Chevrolet Blazer 4.3L engine VIN: 1GNDT13WXS
I have this blazer here with the 4.3 vortex motor.My question is looking at the motor on left bank,driver side there is one hole in the head for the coolant sensor&on the right side they have two knock sensor mounted over top of each other.I know the knock sen...
1995 Chevrolet Blazer 4.3L Excessive Emissions, MIL Lamp on VIN: 1GNCS13W5S
Hi all, this one is a first for me. I have repaired many O2 circuit codes, from simple o2 replacements to wiring problems, but this one has me. The code 13 is still here to haunt me. I have installed the second o2 sensor in doubts of the first one,(opened gre... Trouble codes: 13 (o2 sensor circuit)
1996 Chevrolet Blazer 4.3L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13WXT
came in with these codes p0153, p0154, p0155 low or slow, o2 sensor activity. also had 02 heater circuit. replaced bank 2 sensor with no change. I can't determine if its the ijector assmebly or the computer. fuel trim is at 128 on one side and 138 on bank 2. i... Trouble codes: P0153, P0154, P0155
1998 Chevrolet C1500 Cheyenne 5.7L excessive noise VIN: 2GTEC19R1W
Hi everyone. I could use some help with a bad fuel pump noise. the fuel pump is whining like most gm pumps do in this generation truck. but the weird part is that the fuel lines are resonating the noise of the pump up to the intake manifold. I can feel and hea...
1998 Chevrolet Astro 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDM19W5W
Vehicle came in with codes for lean cyl's bank 2, O2 voltage lean bank 2 and random missfire codes. Scanner shows O2 sensor switching on bank 2. Missfire counters show missfires on cylinders 2 4 & 6. Checking plugs revealed fuel fouled plugs on bank 2 and norm...
1999 Chevrolet C1500 Suburban 5.7L Misfire, MIL Lamp on VIN: 3GNFK16ROX
could a popet noz. do this? Trouble codes: P0304
2000 Chevrolet Camaro Z28 SS 5.7L ABS Module VIN: 2G1FP22G4Y
I'm investigating a crash involving a vehicle that was being driven at a high rate of speed. The ABS system is being blamed for the accident because it appears that the left front wheel left a continuous skid mark while the car was stopping from a speed in the...
2000 Chevrolet Camaro 3.8L Starting VIN: 2G1FP22K1Y
Hello Fellow Techs. Today a customer brought in her car complaining of a no start condition. Upon checking the car out, I found no power coming to the Ignition Switch. Going back to the basics, I checked the Fuses under the hood and found a Blown 50amp Ignitio...
1994 Oldsmobile Cutlass Ciera 3.1L MIL Lamp on VIN: 1G3AG55M3R
I have this vehicle and it has a check engine light on. I hooked up my OTDC scan-tool with the OBD I adapter to pull the codes but I cannot get the tool to communicate with the vehicle. I noticed that the 12 pin connector has only three wires. A black wire wit...
1994 Oldsmobile 88 Royale 3.8L MIL Lamp on VIN: 1G3HN52L8R
Having a little trouble with this one. MIL keeps coming back on after being drove aprox 1000 miles. With the same codes in memory P0401 and P1406. I have cleaned the EGR ports and replaced the EGR valve twiced the second time was with a AC delco part and still... Trouble codes: P0401, P1406
2000 Pontiac Grand Am GT 3.4L Excessive Emissions, Poor Idle Quality, MIL Lamp on VIN: 1G2NV12EBY
Hello everyone I seem to be alittle lost on this grand am and would really appreciate it if someone could help me see the forest for the trees.The car came in for MIL light on and code p0172 set. In freeze frame data it set at 53 mph with ltft at -16 and stft... Trouble codes: P0172

Fixes & Summaries for GM
Fix/Summary Answers
1991 Cadillac Allante 4.5L Battery VIN: 1G6VR338XM
First and foremost I would like to thank Michel,TX. Robert,Tenn. and Ray,Ind. Ok Ray what I should had said was no unacceptable drain, my bad. I never really found a drain on ths system. Have you ever said, Ok it has a new battery and load test says its Ok. Or...
1993 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD53B3P
The cause to our rich running Caddy was blown fuse #5 (15amp) in relay centre. This #5 fuse supplies power to the canister purge, EGR solenoid, tcc/anti-lock brake switch, power steering pressure switch, and trans solenoids. As near as I can figure the fuse in...
1997 Cadillac Catera 3.0L Engine Cooling System VIN: W06VR52R1V
Thanks to all that replied especially Theodore who replied in detail about the oil cooler on this vehicle. Replaced the oil cooler and the car at this point in time is doing great. Only time will tell as this car needed to be driven for almost a hour before an...
1992 Chevrolet Blazer Cheyenne 5.7L A/C pressures VIN: 1GNEK18K3N
Thanks to everybody who helped on my AC issue. For those of you asking about the low/high side pressures, they equalized after running the AC for an extended period of time. We replaced the compressor, blew out the evaporator and charged the system. Everything...
1994 Chevrolet S10 Blazer 4.3L Poor Idle Quality, Poor Fuel Economy VIN: 1GNDT13WOR
To summarize I am new to this forum I learned a lot about using it after posting my request. I learned I need to post ALL the info I also learned I will get a lot of help by using it. I haven't had the chance to fix it yet I do know the fuel pressure is good I...
1995 Chevrolet G30 Hi-Cube 6.5L Stall VIN: 1GBHG31Y3S
after determining that the problem was probably in the injection pump i sent the van to a truck shop that worked on diesels regularly.they said there was a valve sticking in the pump that kept it from dropping off to base idle so quickly.they ran some fuel lub...
1995 Chevrolet C2500 Cheyenne 7.4L Poor Idle Quality, Surge VIN: 1GCGC29N4S
15 replies. This turned out to be the fuel pump. Low fuel pressure. I have worked on so many of these throttle body GM's that I had 9-13 psi fuel pressure stuck in my brain. This truck in fact needs 26-32 as a few of you pointed out. Fuel pressure was low not ...
1996 Chevrolet Impala SS 5.7L power assist VIN: 1G1BL52PXT
Thank you to all who responded. I contacted the rebuilder who stated that at idle my ps press should be 200psi. I only could manage 60 at idle and 160 at 2000rpm. THEY SENT ME ANOTHER PUMP AND IT WORKS FINE . THANKS AGAIN TO ALL WHOM RESPONDED.
1996 Chevrolet Monte Carlo Z34 3.4L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 2G1WX12X1T
After some review and education I realized the fuel trims are 20 to-20 onthis vehicle so with all i have done and also a new o2 sensor today i have test drove (good) and released car to customer. not 100% sure its fixed but i'm sure they will let me know. than... Trouble codes: P0172.
2001 Chevrolet Tahoe 5.3L unknown VIN: 1GNEK13T21
Thanks to all who replied; I don't live in the real automotive world or I would have run into this one before. This car came from the rust belt and southern missouri really doesn't have that much trouble with rust. The fix as everyone suggest was a rusty front...
2002 Chevrolet Venture LS 3.4L Rear Tire Wear VIN: 1GNDX03EX2
Thanks for all the replys, some have encountered this problem, others had some very sound ideas on how to adjust this problem. Everyone seemed to agree that -1.0* is too much (neg) camber, especially in light of the tire wear, and SOME toe-in is needed on a no...
1992 GMC K3500 Sierra 5.7L engine VIN: 2GDHK39KXN
I received 3 replies all stating the swap would not be a problem. I got both trucks into the shop and looked closely. Every thing lined up. Would have to switch complete engine with wiring harness, ecm and y pipe. The only thing that would not work is the rad....
1994 GMC C1500 Sierra SL 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GTEC19KXR
As I suspected, multiple problems were discovered: Reman distributor was junk. Took suggestions from responses and installed new dist shaft & pick-up. 4 pin dist connector had 2 pins with poor contact (been on & off too many times): EST pin & Sig output pi... Trouble codes: 44 (Lean Exhaust).
1995 Oldsmobile 88 Royale 3.8L Surge, Stall VIN: 1G3HN52K3S
Thanks Dave,Roger and Michel we replaced the pcm customer has been driving for two weeks and no more problem.WE tried twisting the pcm but that did not change any thing,monitered fuel regulator,no problem.I suspect a grounding problem inside the pcm.Anyways I ...
1998 Other GM RAMBLER 275CID Unknown
Thanks to all who replied,the check valves are in the assembly from the factory so that the unit can be precharged. The check valves, or quick disconnect valve as some have called them, do not effect performance in any way. I ended up removing them from the sy...
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