GM Automotive Technicians Technical Discussion and Fixes for Apr 12, 2005

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	Help Request	Answers
	1996 Buick Century Custom 3.1L valves VIN: 1G4AG55M1T Hello all! Hey I just and mean just got through putting intake gaskets on this 3.1 and when I went to crank it it sounds like no compression. I used gaskets from fel-pro and it felt like there was some pressure on the pushtubes but not much. Does anyone think ...	View
	1999 Buick Regal GS 3.8L No Start, Stall VIN: 2G4WF5215X I need some help on this Buick. It will start and run approx. 5 sec. and die. No codes are set. Passkey checks out OK. It has injector pulse and ign. when engine dies. What is happening is the PCM grounds the fuel pump relay for the 2 second prime every time b...	View
	2001 Buick Park Avenue 3.8L MIL Lamp on VIN: 1G4CW54K71 Customer brought vehicle in with SES light on steady. I checked for codes, customer took car on a 400 mile trip with no light on. She started it in the garage the other day and as soon as she started it the SES light came on steady. I checked for and found the... Trouble codes: P0440 (Evap System), P0404 (EGR open position performance)	View
	1997 Cadillac Seville SLS 4.6L MIL Lamp on VIN: 1G6KS52Y2V Car come to the shop with check engine light on I check for codes and EGR was Bad plus the po174 after i fix the egr only the code {po174}is on the computer. Check for vacum leaks,exhaust,and that [...] is lean all the time. Trouble codes: P0174	View
	1998 Cadillac DeVille 4.6L Rear Knuckle Bushings VIN: 1G6KD54Y2W Hello Caddy techs; I checked this car out for rear tire wear and found the lower rear knuckle bushings were quite loose. I called around and no one seems to sell just the bushings or any type of repair procedure. All I have found is that you buy the whole knuc...	View
	1990 Chevrolet R1500 Suburban Silverado 5.7L Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GNER16K4L Hello All, This one has us stumped. We got the truck for an engine job. Swapped engine with rebuilt. Very good rebuilder! Got the thing on the road and things started going south. Customer had some hokie aftermarket ign. system on the old engine that we remove... Trouble codes: 42 (est problem)	View
	1994 Chevrolet K3500 7.4L Poor Idle Quality, Surge VIN: 1BHK34N4RE This vehicle has an idle surge problem. It seems to exibit no other driveability symptoms. Idle hunts excessively after warm up and short drives.	View
	1994 Chevrolet S10 2.2L Flywheel VIN: 1GCCS1443R vehicle came in with broken flywheel at center- replaced flywheel and it returned within a week with new flywheel broken in same place- replaced flywheel, torque converter and front pump bushing- it lasted approximately a month and now it is back with same pro...	View
	1994 Chevrolet Lumina APV 3.1L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GNDU06DXR We replaced intake manifold gasket (@ customer request) and problem persists. When started cold engine is hard to start, lopes at idle and sometimes stalls when put in gear , with no detectable miss. Runs like low on fuel pressure or MAP sensor problem. Custom...	View
	1996 Chevrolet S10 LS 4.3L Cuts out VIN: 1GCCS19X5T Truck came in prtty butched up by customer,it will not stay running,traced it down to the #1 grn/white wire at black ecm conn.this is the fuel pump driver control to fuel pump relay,said relay is clicking on off-on off constantly,i have checked oil pressure sw...	View
	1997 Chevrolet K1500 Suburban LS 5.7L Poor Fuel Economy, MIL Lamp on VIN: 1GNFK16R9V This vehicle cam to us from a used car lot. had 2 codes for rich banks 1 and 2. We replaced the O2 sensors (per service manager) as a shot in the dark ( I don't like to work that way)The codes, of course, came back. I have checked the Iatn fix database, and se... Trouble codes: P0172, P0175	View
	1999 Chevrolet K1500 Suburban 5.7L ignition VIN: 3GNFK16R3X i don't have any spark on cylinders 4,6, & 8. the rest of the cylinders are firing correctly with ample voltage. the vehicle does have headers on and had a worse misfire before plugs, wires, etc. were installed. old plugs were almost completely burned out and ...	View
	1999 Chevrolet K1500 Suburban 5.7L MIL Lamp on VIN: 1GNFK16R9X This Suburban will set Code P0137 and P0157 after two trips. Both codes indicate low oxygen sensor voltage at the rear sensors. Using a Snapon scanner and reading oxygen sensors in closed loop both front sensors fluctuate evenly between .08 volt and .9 volt. B... Trouble codes: P0137 (oxygen sensor voltage low b1s2), P0157 (oxygen sensor voltage low b2s2)	View
	2000 Chevrolet Express 3500 LS 5.7L Hesitation, no power VIN: 1GAHG39R3Y this van is the local high school transport vehical. came in complaning of sputtering no power. had code for crank variation not learned. so I instaled new crank sensor and preformed relearn. checked fuel presure good has no volume. replaced fuel pump and filt... Trouble codes: P1336	View
	2000 Chevrolet Malibu LS 3.1L Surge VIN: 1G1NE52J0Y This vehicle has an intermittant problem that the customer is complaining about and I have not been able to duplicate. the engine RPM at cruise will jump 100 rpm and it will do this for 100 K. up and down without setting any codes then it will stop and run nor...	View
	2001 Chevrolet Malibu LS 3.1L MIL Lamp on VIN: 1G1NE52J01 Have done a lot of checking on this vehilce and ther related wiring ohms out and checks out as per tests. According to mitchell an abnormal temp increase from the engine. Also the cooling fans will come on without warning engine running and run constantly hot ... Trouble codes: P0128	View
	2002 Chevrolet Express 3500 LS 5.7L Poor Idle Quality, Stall VIN: 1GAHG39R12 looking for fuel pressure and volume specs for this van.i have [...] initial then drops to 52psi.koer has 55 psi but when testing volume with motorvac system at filter engine will not stay running even with slow opening of valve to machine.this may or may ...	View
	1998 GMC Jimmy Envoy 4.3L Dome lights VIN: 1GKDT13W8W I am going in circles here. This vehicle came from another shop with several problems. I have gone through wiring diagrams none of which are very helpful. The gist of it is that the dome lights will not shut off. It won't shut off with doors closed,key on or w...	View
	1961 Oldsmobile starfire 394CID front drums VIN: 1237123346 We're just wondering if anyone out there knows of an outlet to purchase two front brake drums?	View
	1990 Oldsmobile Silhouette 3.1L Cuts out VIN: 1GHCU06D9L This van idles ok but when rpms go past about 2000 it will blow fuel up through throttle body and make a fast popping noise. Problem gets progressively worse until around 3000 rpm where it will not rev any higher. If held wide open it will make louder more dis...	View
	1994 Pontiac Sunbird LE 2.0L Poor Idle Quality VIN: 1G2JB14H5R Hi group, This sunbird has a rough idle at all times, and when i pull off the plug wire to either cyl# 3 + 4 the idle quality does not change as it does on cyl 1 + 2. There is a strong spark to ground from both 3 and 4 wires,new plugs have been installed,compr...	View
	1995 Pontiac Bonneville SSE 3.8L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1G2HZ5218S I have a real brain teaser. This vehicle originally came in for a stall and very poor run. The symptoms were not present until vehicle was upto operating temperature for awhile. After it would stall the engine will idle roughly. I can raise the RPM to 2000 and... Trouble codes: P0341	View
	1994 Saturn SW1 1.9L No Start VIN: 1G8ZG8597R This Saturn has an extremely intermittant problem; after hot soak it cranks, but won't start. This condition only lasts for about 2 minutes at best, and often it does not happen at all. During the no starts I've been able to reproduce the following is true: Ha...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1992 Cadillac Eldorado 4.9L No Start thanks to everyone for there help did find cut wires under the dash to the key resistor and a missing pass key module,,,here is some info I learned and found helpful...The Pass key module reads the key the first time in use...and keeps it in memory..There were...	5
	1997 Cadillac Catera 3.0L p0560 VIN: WO6VR52R8V Thanks so much for everyone's help on this one. Took a few weeks to be sure the problem was fixed. We found the alternator had an intermittent problem inside, and would not function properly sometimes, cause the low idle problem and no cooling fans. After repl... Trouble codes: P0560.	3
	1998 Cadillac Catera 3.0L Starting VIN: W06VR52R3W Thank all of you for your assistance. The customer did not want to spend the money to try and solve this problem.	5
	1977 Chevrolet Corvette 5.7L Suspension VIN: 1Z3717S406 Thanks for all the great responses. The customer has not yet scheduled this car for repair, BUT judging from the attached responses, it appears it IS POSSIBLE to do this job without removing the body. Most say it just takes time and patience. Use a torch or sa...	11
	1989 Chevrolet Corsica 2.8L Excessive Emissions, Poor Idle Quality VIN: 1G1LT54W2K Sorry for the delay in posting a fix. I found two of the rebuilt injectors giving us issues. I removed them and had those retested they found two flowing excessivly and one #5 not flowing near enough. So after replacing with a good set of injectors the vehicle... Trouble codes: 45 (rich exhaust).	12
	1995 Chevrolet Monte Carlo Z34 3.4L Vehicle Antitheft System VIN: 2G1WX12XOS It turned out to be wires at ignition switch after wires were wiggled they went open thanx all who responded thanx rick	8
	1995 Chevrolet K1500 5.7L abs VIN: 2GCEK19K45 hello, while i dont feel this truck is 100 percent, we had the owner drive it. he claims the pedal was always soft since he's had it. he says it's better now then ever before. here is what we learned: this abs system has three components. 1) the EHCU electro h...	6
	1996 Chevrolet Corsica 2.2L Misfire, MIL Lamp on VIN: 1G1LD5541T The car is fixed! the problem turned out to be that the rocker arms for #1 cyl. were keeping the valves slightly open. We had to shim the rockers about .015 and that alowed the valves to close properly. We had ma replies that told us to check the running compr...	12
	1996 Chevrolet Cavalier 2.4L water pump VIN: TJGOO-T000 Thanks very much to all that replied.and a special thanks to Martin and [...] for there fax replies. This vehical is baged Toyota here but imported from Japan. Toyota New Zealand have no information and in some cases won't even work on them. Once again thank you...	11
	1997 Chevrolet Blazer 4.3L Hesitation, Misfire, MIL Lamp on VIN: 1GNDT13W0V hi thanks for all the help with this vehicle. i've been so busy with other customer work that i wasn't able to look into this vehicle any more. so far the only thing that i see out of the ordinary is the cam retard is at -14 degrees. thanks for all the help. Trouble codes: P0300, P0420, P0100.	26
	1997 Chevrolet P30 BUS 7.4L park brake VIN: 1GBLP37NXV Well, this one will be USELESS to anyone in the future. . .I am sure! As it turns out, this brake warning lamp HAD NOT come on for the customer when simply shifted into park (at least most of the time). What was found was a poor connection at a connector (for ...	4
	1998 Chevrolet Blazer 4.3L Surge VIN: 1GNDT13W3W after looking at the torque converter when it was engaging it was at the same time i had my surge. i found out that there is a update solenoid that you put in. found that also the torque converter was very blue from getting very hot. so i replaced the torque c...	10
	1999 Chevrolet Blazer 4.3L Hesitation, Surge, Misfire, MIL Lamp on VIN: 1GNDT13WOX Hello guys, Several replies wanted compression checked cold, others had me inspect for vacuum leaks. The fix was a new B2S1 O2 sensor. The sensor would short to power for a short time during warm up and then return to normal operation the rest of the time. The... Trouble codes: P0300, P0152.	10
	2002 Chevrolet Trailblazer LS 4.2L transfer case VIN: 1GNDT13S82 Much thanks to all who replied; Several of the replies seemed to indicate that the selector switch assembly on these vehicles seems to be a common failure item. Normally, we don't like to throw parts at undiagnosed problems, but in this instance it seemed li...	11
	1998 GMC C3500 Sierra SL 7.4L Turn Signals VIN: 1GDKC34J9W First of all, I would like to thank all who took the time to respond to my help request. What I found was some really shoddy wiring in the rear lighting circuit. It was full of corrosion caused by 'scotch locks' and wire nuts and ample amounts of black tape! L...	9
	1992 Pontiac Grand Am SE 3.3L Cuts out, Stall VIN: 1G2NE51N4N I have personally responded to all who replyed. It seems that my user name & password were compromised. I don't know anything about this vehicle or who sent this help request. I have changed my password to prvent this from happening again. Thank you all fo...	10
	1996 Pontiac Firebird 3.8L cooling VIN: 2G2FS22K8T I recieved an overwelming number of responses, and almost all said the intake gaskets were the problem. Well you were all right. I replaced the intake gaskets and every thing is fine. Easy fix if it were any other vehicle. Thank you all very much for your time...	17
	1997 Saturn SL1 1.9L Stall VIN: 1G8ZH5287V Hello everyone,unfortunately we did not get a chance to repair this one,the customer opted for a trade in... However the information received from all the replies was very beneficial,I sincerely thank-you all.Almost every reply sugested the replacement of the ... Trouble codes: P0404.	6

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