GM Automotive Technicians Technical Discussion and Fixes for Mar 28, 2006

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	Help Request	Answers
	1997 Buick Century Limited 3.1L Accessories VIN: 2G4WY52M4V After replacing intake gaskets,the vehicle had a dead battery.we recharged the batt,started car ,etc then noticed the oil light flashing, temp gauge hi but coming down,improper odometer reading.After the car is shut down for a while and restarted,the temp gaug...	View
	1995 Cadillac Eldorado ETC 4.6L Poor Idle Quality VIN: 1G6ET1292S THANK YOU ALL IN ADVANCE! we have this eldorado etc in our shop for a lube oil and filter, customer leaves it over the weekend. when picked up he comes back 5 minutes later and stated that it is running at high idle 1200+-. visual under hood, look secure, turn... Trouble codes: 80 (idle relearn), 55 (throttle position)	View
	1997 Cadillac Eldorado ETC 4.6L trunk release and fuel door release VIN: 1G6ET1294V this car came in with a battery draw last week, we fixed that problem with a new body control module. now the car came back in with a new problem. when the key is shut off the radio pops throught the speakers and the trunk and fuel door open.	View
	2001 Cadillac Seville STS 4.6L Unknown VIN: 1G6KY54991 a former tech replaced tires on this cadddy. i tire pressure sensor reads o. not sure where tech placed tire on vehicle. alldata says must have special tool to re-set monitiors. tech 2 shows left frt tire at o psi, but is that a true read since we dont know wh...	View
	1990 Chevrolet Astro 4.3L MIL Lamp on VIN: 1GTDM15Z2L hello all came in for smog test failed for nox and check engine light inop, egr has no vacuum to it, when grounding control wire at ecm egr receives 10" vacumm, when grounding the cel wire at ecm light works, checked all power and grounds to ecm ok, replaced e... Trouble codes: 32 (egr system problem)	View
	1993 Chevrolet S10 Blazer Tahoe 4.3L Differential VIN: 1GNDT13W0P Let me first Thank you for taking the time to reply to my request for help. This is my Fiancee' Blazer and I need some help. The front differential sounds like it is partially engaged, I read in the archives about the vacuum switch at the Transfer case leaking...	View
	1993 Chevrolet K2500 Cheyenne 6.5L Upshift, Downshift, No Output Reading VIN: 1GCGK24F9P OK welcome to a nightmare. 4 Mont hs ago this vehicle was in our shop. Transmission was cooked. So, we sent it to our rebuild facility (sublet). When we got it back everything was fine. Let the customer have the truck. The next day it came back with a 22 Code ...	View
	1994 Chevrolet Camaro 3.4L High Idle VIN: 2G1FP22S4R Greetings all, I've got one that came in with an out of range IAC. We istalled a rebuilt engine 2 monthes ago (not me personally). Found 2 Vaccum leaks and repaired. Car idles cold start about 1200 then once driven awhile it will idle at 1800 to 2000 with no ... Trouble codes: 35 (iac idle speed error)	View
	1995 Chevrolet K3500 5.7L abs light VIN: 1GBHK34K0S what a week 2nd post im starting to get a complex. truck has several abs codes that wont clear but only one is a valid code 25- open lf sensor other codes are(verified w/dvom but still sends signal?) 21-open rf sensor,26-lf dynamic sensor,23 erratic sensor rf,...	View
	1995 Chevrolet K2500 5.7L No Start, Stall VIN: 1GBGK24KXS Complaint of starts hard and dies first thing when cold, then after it warms up, it is fine. Hooked up F/P gauge at fuel filter(looked old and rusty, so we put a new one on) and checked pressure = 11 PSI, ok. Checked volume, ok, over 1 pt. per 15 seconds. Engi...	View
	1998 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCDT19X8W Hello, I have a 98 s-10 pickup 4.3 (x) code that has a code Po327 knock sensor. The vehicle has to be driven about 40 miles before the light will come on. Vehicle runs great, i checked for 5v at sensor, replaced the knock sensor with a new A.C. Delco and don't...	View
	2001 Chevrolet Tahoe 5.3L Poor Idle Quality, MIL Lamp on VIN: 1GNEC13T21 this veicle came in for a ses light on codes were the ones mentioned above. this particula engine has a problem with the intake gaskets leaking , and also fuel filters plugging up, causing premature pump failure. filter was replaced initially due to being plug... Trouble codes: P0171 (lean exhaust bank 1), P0174 (lean exhaust bank 2)	View
	2001 Chevrolet S10 4.3L Poor Idle Quality, Misfire VIN: 1GTDT19W21 Hi just got back from mexico should of stayed there. My co worker left me with a jack pot.He replaced plugs wire cap rotor trying to get rid of a missfire in 1 3 5 cylinders.He spend sometime trying to diag but didnt get anywhere so I got it.Scan shows b1 s1 g... Trouble codes: P0300	View
	2001 Chevrolet Silverado 1500 4.3L Surge, Cuts out, Misfire, MIL Lamp on VIN: 2GEC19W311 original complaint, no start. replace burnt out ign rotor and cap(i mean burnt up bad, no graphite post left in cap). engine would now start and idle but upon any slight acceleration engine stumbles and cuts out. scanned comp systems and all appear normal. i n... Trouble codes: P0300	View
	2001 Chevrolet Silverado 2500 HD LS 6.0L passenger side VIN: 1GCHK23U71 lots of cold air comes in by the passenger side kickpanel. cant see any leeks or holes but there is a signifigant temp drop from driverside to pass. side. heater blows hot air, just lots of outside air comes in. everyhting seams to be in order visually. i also...	View
	2003 Chevrolet Trailblazer LTZ 4.2L air flow VIN: 1GNDS13S23 air blows out wrong vents. we replaced ign. switch because the car would cut off instuments go crazy etc. part of the switch was not supplying full voltage to all fuses under hood (and possibly under rear seat where hvac fuse is). customer says the air distrib...	View
	1990 GMC V1500 Suburban 5.7L Excessive Emissions, No Start, Poor Idle Quality, Stall, Poor Fuel Economy, Flooding VIN: 1GKEV16K2L This vehicle was brought to us a very long time ago and was put on our to do list. Original complaint from customer was that the vehicle was heavily flooding. When it arrived, it was moveable, it has not started since. We experimented a little bit with it at f...	View
	2001 GMC Jimmy SLE 4.3L lights VIN: 1GKDT13W51 all lights interior and exterior are pulsing slightly. charging voltage is 14.2. alt ripple looks good. any suggestions would be greatly appreciated	View
	1995 Oldsmobile Aurora 4.0L coolant leak VIN: 1G3GR62C9S We have a coolant leak under the intake manifold, there is a pool of coolant under the front and dry at the back. We are wondering if anyone has run into this before? We are suspect that may be a head gasket leak as the intake looks to recently been replaced w...	View
	2001 Oldsmobile Silhouette Premiere 3.4L security light VIN: 1GHDX13EX1 I have this van in here for a security light problem after starting the vehicle, the van starts ok but the light will stay on while you drive it. I get a p1189, b1009 and a b2734 code in the system. I have cleared the codes but all will return. I follow the fl...	View
	1996 Pontiac Grand Am GT 2.4L Starting VIN: 1G2NW52T1T car came to me with a start and stall condition.car would run without stalling as long as it wasn't being driven but,while driving at no certain distance car would stall and then would only start and stall until i did a relearn procedure for the security modul...	View
	2000 Pontiac Grand Am SE 2.4L steering VIN: 1G2NF52T0Y This car has a low growling noise, can hear inside car when turning wheel. This is not the typical power steering whine noise, but deeper and more of a growl. When car came in noise would occur when made any sharp turn. Both hoses were seeping and a little low...	View
	2001 Pontiac Grand Prix GT 3.8L Stall VIN: 1G2WP52K61 After sitting for more than 15 minutes the car will stall after the first and sometimes second start. It will start and run fine after restarting. The car does not exhibit any other stalling or rough running symptoms. No codes stored. The throttle body was loa...	View
	2002 Pontiac Grand Am SE 3.4L radio VIN: 1G2NE52T6T Vehicle came into shop with a no start condition. Found ignition switch defective. Replaced switch and vehicle now starts and runs perfectly. When customer picked vehicle up he said that his radio will now not illuminate the time or stations. I've heard that t...	View
	1993 Saturn SL2 1.9L Reverse VIN: 1G8ZK5578P Hello all, Chas from Tucson: I have helped alot but never have asked for it till now.I have a taat transmission with a harsh reverse engagement but it seems to be only after a hot soak.I rebuilt the transmission and replaced the valve body with a new dealer va...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1990 Buick Electra Park Avenue 3.8L Engine & Lights VIN: 1G4CW54C7L Thanks to all that replied. The car owner is still deciding if he wants to pay me for the additional work. After disconnecting the headlight module the headlights stayed on without blinking. I disconnected the wiring harness from the steering column previously...	9
	2000 Cadillac Seville SLS 4.6L StabilitySys VIN: 1G6KYS490Y Well as most of you said. I replaced the steering wheel position sensor and repaired this vehicle. I did lube the intermediate shaft while we had it removed. Thank you all for your time...	10
	1993 Chevrolet Lumina 3.1L transaxle VIN: G1WN14T599 Good morning, well from most all the info I have recieved this transaxle swap is not going to work. What we have is a much different wiring/solenoids configuration from one to the other. Thanks for all of the replies, my plan is to check the original tranny ou...	12
	2000 Chevrolet C3500 5.7L Misfire VIN: 1GCGC33R5Y Again, thanks to all for your help. Intoduced propane into the pcv valve and no change. After too much time chasing electrical issues, the end result appears to be a piece of carbon stuck in the egr port. This explains the rough idle. Tech said he checked it b...	12
	2000 Chevrolet P-30 5.7L Alternator VIN: 5B4KP32R5Y Thanks for every reply! Each were good clues to figuring this out. WHEW! OK, here we go. FIXED! * 2 issues *It seems that one of the replies (Jim from Washington) knew what the parts houses didn't. Come to find out as I replaced the alternator, CSK deliv...	12
	2002 Chevrolet Suburban 1500 LS 5.3L transfer case VIN: 3GNFK16TX3 I wish to thank all responses for this vehicle fault. I am very embarrased as the vehicle has not returned for dianostics. I jumped the gun as this, I thought was a very good customer. Using all info given I felt I had a chance to begin the dianostics. I kept ...	5
	1994 GMC G2500 Vandura 5.7L Poor Idle Quality VIN: 1GKEG25KOS Many responses suggested a throttle body gasket leak. This didn't fit the situation, because plugging off the IAC would bring the idle down to about 700. If there was a vacuum leak, plugging off the IAC wouldn't bring the idle down. A few suggestions recommend...	11
	1997 GMC C1500 Sierra SL 4.3L Misfire VIN: 1GTEC19W2V first off, let me say thanks to serge and brian, it was a worn distributor gear, replaced and cust has vehicle, just love the iatn, 100% accurate, great job people.	9
	1992 Oldsmobile Cutlass Supreme S 3.1L instrument panel VIN: 1G3WH54T2N thanks for the replies, currently unit is on its way to another repair facility thanks to william [...] for the phone number of tom (mr.whizard)seems he knew where the problem is. thanks to iatn and all the responders this is great. dennis.	4
	1995 Oldsmobile Aurora 4.0L Speedometer VIN: 1G3GR62CXS Thanks to all that responded to my help request. Having spoken with tech support at the approved ACDelco Instrument Cluster Repair center, it was agreed upon that the Instrument Cluster was indeed the culprit. Before any necessary repairs are to be made to t...	3
	1994 Pontiac Grand Am SE 3.1L No Start VIN: 1G2NE55M2R First of all I would like to thank you all for responding. I was grateful for the help. Most of you said that I should check the crank sensor harness. I could not find anything wrong with the wires or connectors. I removed the module and coils and checked them...	13

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