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Prev Professional Automotive Repair Technical Discussions for March 15, 2005
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Open Help Requests for GM
Help Request Answers
1995 Buick Riviera 3.8L No Start, Cuts out, Stall, MIL Lamp on VIN: IG4GD221XS
Car came in first time for a no start condition. Had spark but no fuel. I checked system and determined had a bad fuel pump. Replaced pump and car ran good for 2 weeks. It came back with a crank no start again. Found a no spark condition and determined that a ... Trouble codes: 321 (no crank signal), 341 (cam crank error count too high), 361 (18 x inaccurate)
1996 Buick Skylark Limited 2.4L Stall VIN: 1G4NJ12T5T
Customer complaint that the car just quits while driving. She stated that it always restarts easily. The ignition switch was replaced by others. I replaced the crank sensor due to oil in the electrical connector. I checked the IAC and cleaned the ports for it... Trouble codes: 11 (VTD Short this ignition cycle), 21 (Loss of PCM serial Data), 12 (Bad R code this ignition cycle)
1991 Cadillac DeVille 4.9L blower motor VIN: 1G6CD53BXM
Help! this vehicle came in due to battery running down 91 Cad Deville has a blower motor that is stuck on when heater is in "off mode" and key off. we looked for a relay, found none, customer had pulled heater fuse on firewall. We pluged in fuse and found bl...
1988 Chevrolet Astro 4.3L No Start VIN: 1GCCM15Z4J
Probably overlooking the obvious, no fuel from injectors. Hooked up the noid tester and looked good. Thought maybe injectors but both of them at the same time. Once in a while, it will start but when it starts both injectors work and then both wont.
1995 Chevrolet Blazer 4.3L Poor Idle Quality, Surge, Stall VIN: 1GNDT13W5S
the truck initially came in for a "crank but won't start concern". the truck was cranking slow, we recharged the battery. cranks fine but found ignition wires flashing over and the spark plugs were very worn with carbon built up on them. performed a complete t... Trouble codes: P0141, P0300, P1406, P1133, P0441, P1122
1996 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC1247T
This car while cranking grounds the injector drive circuit and holds the injectors wide open. The injector drive is grounded with the ECU unplugged. If you un-plug the fuel pump, the injector drive circuit looses its ground. Any help? Has new fuel pump.
1996 Chevrolet K1500 Suburban 5.7L no tach, speedo or shift indicator VIN: 1GKFK16R6T
greetings, thanks for any help, customer said speedo, tach and shift indicator all went dead while driving. no other actions or symptoms that could be related. chacked the basics, and searched data base. found the exact same symptoms but "closed w/out fix"... ...
1997 Chevrolet C1500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 1GCEC19R3V
Thank you for advise in advance, I have had nothing but agrivation from this truck. The truck runs and drives good when it is warmed up. couple days after it is back in owners possesion it will start with a flashing check engine light and bad miss. code will c... Trouble codes: P0300, P0307, P0302
1999 Chevrolet Camaro Z28 5.7L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 2G1FP22GSX
Has random misfire code P0300. Misfire counts seem to be mainly with #3, #5, and #7 cylinders. Has had misfires on other cylinders in history but mainly those 3. Fuel pressure is good, injector pulse is good, smoked intake for vacuum leaks and none found. Can ... Trouble codes: P0300 (Random Misfire)
1994 GMC Jimmy 4.3L No Start
Received this 1994 GMC Jimmy used from a private owner. Never mentioned extremely hard to start cold problem but did note that he had replaced injector, fuel filter, tp sensor. It will crank for a good 10 seconds (when battery lasts) before starting. Usually s...
1997 GMC Yukon SLE 5.7L MIL Lamp on VIN: 1GKEC13RSV
I inspected all the parts that he had replaced and all seemed fine. Alldata led me to belive that the distributor was off one tooth (cap is marked for 6 or 8 cylinder). While at TDC on number one cylinder, I pointed the rotor at #8. Still had the misfire; trie...
1994 Pontiac Grand Am SE 2.3L No Start VIN: 1G2NE1530R
Hi guys, This is just not my week. This vehicle was towed in from another shop sayng that it just won't start. They only do brakes & mufflers. We checked to see if it was getting spark and it is. Then checked the fuel. Pressure was good but volume was low. A...
1995 Pontiac Grand Am SE 2.3L No Start, Stall VIN: 1G2NE15D4S
Car came in on the hook for a no start. After all the usual checks we found it to have weak spark, and what appears to be weak fuel pulse. Fuel pressure is OK. We checked all the grounds we could find and have possibly fixed the weak spark condition. The vehic...
1995 Pontiac Grand Am SE 2.3L Excessive Emissions, Poor Idle Quality, Cuts out, Stall, Misfire, kick-back/detonation VIN: 1G2NE55D9S
Hi gang, got this quad 4 g/am that had a dead miss @#1 cyl,+ weak spark@ #3=figured,bad coil{companions}=Wrong,it's 1+4/2+3,anyway very hard start,unless you give either full throttle or slight throttle ,,, this frequently bucks back+stops instantly,like pre-i... Trouble codes: N/A
1999 Pontiac Bonneville SE 3.8L fuel,gauge VIN: 1G2HX52K0X
fuel gauge reads full or empty @ different times, The gauge will still vary even with the sender unplugged. Tech 2 says gauge @ 200 Percent. PCM replaced with advice of aspire. Need to solve this any help please !!
1993 Saturn SL1 1.9L No Start, Stall, MIL Lamp on VIN: 1G8ZH5594P
This car will not start or will just stop running. This problem is very intermittant. It will run OK for two or three days then it will not start. If it is left for one hour it will start with no problem. It will have no spark, no injector pulse and no RPM sig... Trouble codes: 19 (26 - purg flow solenoid), 26 (purg flow solenoid), 32 (EGR solenoid)

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Park Avenue 3.8L anti-theft VIN: 1G4CW52KXW
thanks,for all the help. cust. had changed keys with different resistance. i done a relearn for new key. it worked.thanks again christopher,stephen,david,rick,jerry,and douglas for your time and sharing this info.
1996 Cadillac DeVille 4.6L Misfire, MIL Lamp on VIN: 1G6KD52Y8T
had replies suggesting spark plugs, drippy injectors, dirty injectors, weak coil, head bolts, leaky fuel press reg and last but not least, leaking head gasket. i got the engine hot, let it cool off with a cooling system pressure tester holding approx 15 psi at... Trouble codes: P0300, P0305.
1999 Cadillac Seville STS 4.6L No Start VIN: 1G6KY5495X
Greetings Replaced ignition switch and car has been fine for a week. Most replies suggested that the switch was bad. Fairly easy fix and your replies confirmed my suspicions. Thanks all
1982 Chevrolet S10 2.8L wiper/washer system VIN: 1GCCS14BOC
Thanks to all that responded to this post. After 3 tries with AC-Delco and Burt Chevrolet we came up with 3 bad wiper switches. The customer decided to go ahead and take his truck to an auto electric specialist. This one was a head scratcher and to advise that...
1992 Chevrolet Step Van P30 6.2L Cooling Systems VIN: 1GTJP32J7N
found bad t stat after 2 aftermarkets put in oe t stat run great now. it was a rear hair puller. thanks for help
1993 Chevrolet Caprice 5.0L Excessive Emissions, Surge, Misfire
i need to thank all of you that responed. what i did as alot of you mentioned was to put a 4 wire bosch o2 sensor in it. it had open slot in fuse pane that was hot with ignition. it ws just a matter of running wire to it and putting a fuse in it. i did check t...
1993 Chevrolet K1500 Cheyenne 4.3L Poor Idle Quality, Surge, Cuts out VIN: 1GCEK14Z6P
thank you all for responding.I wanted to wait a little bit before I said anything.the truck has been gone a couple of weeks now.I found the problem to be in the distributor.after 3 remans we went back to gm for delco unit and it runs good.thank you all for yor...
1995 Chevrolet K1500 Cheyenne 5.0L Hesitation, Surge, Poor Fuel Economy VIN: 1GCEK19H7S
Here is where we are at on this truck: The reason for the KS activity counting up was due to using the TECH2 instead of the TEch 1 scan tool. The Tech 1 was showing 'knock signal = yes' continuously, with key on, and ENGINE NOT RUNNING. Disconnecting the knock...
1997 Chevrolet K2500 Cheyenne 6.5L all shifts VIN: 1GCGK29F0V
All of the replies stated to check the 4WD low PID on the scan tool for being active. That was checked and rechecked several times. I eliminated that by disconnecting the input wire to the PCM via the 4WD switch and no change. Different PCM were tried on two o...
1998 Chevrolet K2500 Suburban 5.7L distubor VIN: 3GNGK26R9X
Hello one and all, well i have offially encountered Owens worlds, lol, the owners world. Any how what i ran into was the worn drive gear had damaged the oil pump drive, and the plastic collar had also came apart, providing an angle to the drive at the same tim...
2001 Chevrolet Impala 3.4L lifter noise VIN: 261WF55E91
Hello to all and thank you all for your thoughts! The engine noise has been solved! Several of our members said to change the oil to a synthetic type and to install a AC/Delco filter! That solved the problem! Thanks again for all the help! Regards to all; ...
2002 Chevrolet Tracker 2.0L heater core VIN: 2CNBJ13C12
Hi group, sorry for the delay. Very strange problem and now G.M. work also with me. What we found is also very stange, The hose clamps on the rubber hoses on the heater core have .640mv for one and the other hose the clamp have .520mv. Voltage mesured from the...
2003 Chevrolet Silverado 1500 4.3L Excessive Emissions, MIL Lamp on VIN: 2GCEC19X63
Jon was very helpfull. He said the main reason for this code is not warming up. When a truck is from the body shop he has found this to be caused by after market radiators that do not have the restrictor going to the purge tank. It allows too much flow and wil... Trouble codes: P0128 (engine coolant temp sensor circut).
2003 Chevrolet Express 2500 5.3L Poor Idle Quality, Misfire VIN: 1GCFG25TX3
Why didn't I think of switching the injectors--because they ohms checked good, and even worked with my power box. 2 new ones fixed it because when I switched them, it went to a different cylinder on the misfire graph. Sometimes all the testing is not as reliab... Trouble codes: P0200, P0300.
1996 GMC C2500 Sierra SL 5.7L Misfire, won't shift VIN: 1GTFC24R6T
My friend that I posted this help request for finally got time to get this 'back burner' job back in to try some of the suggestions I received. There were a few guys that recomended things that he had already tried, but almost half of the replies I got were to... Trouble codes: P0300.
1997 GMC K1500 Sierra SL 5.7L Misfire, MIL Lamp on VIN: 1GTEK19R6V
I would like to yhank everyone for there help, As you probably figured out it was the cmp retard out of spec. adjusted to -2 and all good. Trouble codes: P0300.
1999 Pontiac Grand Am SE 2.4L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1G2NE52T7X
thanks for all the replies.after going over everything agian I piad closer attention to fuel psi.original spec was 45 psi koeo.this car had 45 psi at all times.fuel psi regulator was stuck.after changing regulator fuel psi with engine running was 38 psi,which ... Trouble codes: P0171, P0172.
1999 Saturn SC2 1.9L monitor reset VIN: 1G8ZHI273X
The vehicle was fixed by replacing the thermostat and changing the antifreeze. It seem that someone has installed RV antifreeze instead of the Dex Cool antifreeze recommended by the manufacture. What has us puzzled is that the antifreeze tested normal and you ...
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