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GMC engine repair questions and answers

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  • knox
    knox - 1998 GMC Sonoma - Engine - 7/20/2014
    My truck is losing oil. I can't find leak but I have had to add four quarts in the last two days.
    Truck is losing oil I have had to add 4 quarts the last two days no smoke but I can smell oil trying to figure out what I'm up against
     
    • Jimm
      7/20/2014 Jimm
      Check your engine oil level. Open your car's hood, remove the cap to your oil reservoir and take out the dipstick. Wipe off any oil with a rag or paper towel so you can see the mark that indicates the proper oil level. "Dip" the stick into the oil reservoir and then take it back out. Look to see if the oil on the stick reaches the oil level mark. •Add oil if the crankcase is low or empty. Continue checking every 30 minutes. Rapidly leaking oil could mean there is a hole in your oil pan.

      Use a fluorescent leak detection system. The combination of an ultraviolet (UV) or blue light and fluorescent dyes allows you to find small oil leaks. Add an amount of oil soluable dye to your oil reservoir and let your engine idle for 10 minutes. With the overhead lights off, shine the fluorescent light over your engine. Glowing areas indicate leaks.

      Apply a thin coating of talcum powder around the engine. Drive your car for about 15 minutes. If there is oil on the surface, it will appear in the powder, allowing you to see its point of origin.

      Test the oil line. Check that your oil reservoir is full and start your car. If the oil line is the source of your leak, oil will spurt out when force is used. Oil lines can be replaced or repaired with silicone tape.

      Locate the oil pan gasket and remove any sediment. Put a bucket beneath the pan, remove the plug and drain all of the oil. Put the plug back on and fill the pan. If oil pools around the edges, the leak is in the gasket.
  • AutoMD Member
    AutoMD Member - 2006 GMC Envoy - Engine - 7/19/2014
    Why is my engine shaking, white smoke out exhaust and pipe is black, and had it serviced 2 weeks ago yesterday it's dry
    Got the suv 2 and a half months ago was told valves were newly replaced he guaranteed the engine to Dad and I. Gave him 3000 down and one payment engine soon light comes on then I notice engine shaking then white smoke out exhaust and pipe black. Hard to shift into ...
     
    • jdl
      7/19/2014 jdl
      Did you get the guarantee in writing? Talk to the person you bought it from. The white smoke sounds like coolant getting into the combustion chamber, gasket issue or something is cracked.

      If you don't know the person you bought it from, stranger, it is buyer beware. If you bought it from dealership, again, go talk to them.
  • AutoMD Member
    AutoMD Member - 1998 GMC K1500 - Engine - 7/19/2014
    Truck has no power on acceleration
    Barely get truck to hit 3000rpm won't go over 50mph sounds like hissing and clicking under truck
     
    • jdl
      7/19/2014 jdl
      How long since a tune-up? Can you get under the hood, and while a helper rev the engine and, locate the sounds? Does it idle ok? Usually vacuum leaks are more noticeable at idle.

      A dead cylinder at highway speed may show up as a lack of performance, at idle it may be noticeable. Any applicable trouble codes?
  • AutoMD Member
    AutoMD Member - 1994 GMC K1500 - Engine - 7/19/2014
    How to fix leaking oil filter housing?
    So I have changed the gasket on my oil filter housing ( oil filter adapter) 3 times now and its still leaking. Am I doing something wrong? what can I do to ensure I get a more permantent fix?
     
    • jdl
      7/19/2014 jdl
      The housing/adapter or the block isn't cracked is it? Did you try sealer on the gasket?
  • AutoMD Member
    AutoMD Member - 2000 GMC Sierra 1500 - Engine - 7/18/2014
    My check engine light came on and said o2 sensor s are bad had them changed had it cleared and came right back on saying
    Check engine light came on code said o2 sensors were bad had them changed and had the codes cleared then the light came right back on about 15minutes later saying o2 sensors are bad again. My mechanic checked them and said they are good so why is the computer saying ...
     
    • Jimm
      7/17/2014 Jimm
      Possibly the wiring or connection associated with one or more O2 sensors. Please post a reply with the specific fault codes for further assistance.
      Jimm
      7/17/2014 AutoMD Member
      P0131 p0140
    • Jimm
      7/18/2014 Jimm
      P0131 OBDII CODE;

      Symptoms
      - Engine Light ON (or Service Engine Soon Warning Light)
      - High Fuel Consumption
      - Excessive Smoke from Exhaust
      Possible causes
      - Harness or connectors (The sensor circuit is open or shorted)
      - Front Heated oxygen sensor (Bank 1) may be faulty
      - Fuel pressure may be faulty
      - Injectors may be faulty
      - Intake air leaks may be faulty
      - Exhaust gas leaks
      Possible solution
      Replacing the O2 Sensor 1 usually takes care of the problem
      P0131 Description
      The front heated oxygen sensor (or sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the ECM. The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

      P0140 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
      Symptoms
      - Engine Light ON (or Service Engine Soon Warning Light)
      - High Fuel Consumption
      - Excessive Smoke from Exhaust
      Possible causes
      - Harness or connectors (The sensor circuit is open or shorted)
      - Rear heated oxygen sensor (Bank 1) may be faulty
      Possible solution
      Replacing the O2 Sensor 2 usually takes care of the problem
      P0140 Description
      The rear heated oxygen sensor (or sensor 2), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank.

      Even if switching characteristics of the heated oxygen sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2.

      This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions.

      Similar recommendations for both fault codes; may not be related directly to the O2 sensors themselves - check the listing of possibilities for each code.
  • AutoMD Member
    AutoMD Member - 2005 GMC Yukon XL 2500 - Engine - 7/17/2014
    I got 2 new front tires and had a wheel alignment. Since then my car resets-the clock and radio- when i start it. O
    one time it didn't start at all. while waiting for AAA I closed my door and could hear the engine reset and the car started. It worked ok for about a day and about 5 starts and now is back to the resetting. What is wring?
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2005 GMC Yukon XL 2500 - Engine - 7/17/2014
    I got 2 new front tires and wheel alignment. After that my car resets when I start it-the clock and radio stations only.
    The other day it wouldn't start at all. While waiting for AAA I heard the electronics kick in after closing the door and then the car started up. Started fine after that, but now is doing the resetting again. What's wrong?
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2000 GMC Sierra 1500 - Engine - 7/16/2014
    My entire right bank of coils have no fire. All of a sudden my truck started running like crap.
    the mechanic I know came over and thought it was the injectors but once he seen they were good that's when he found out that the entire driver side coils aren't firing. He said it could be a wire came off or the computer. Any ideas? Also now they is a rattling ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2004 GMC Sierra 1500 - Engine - 7/16/2014
    Fuel gauge not reading, how is this fixed??
    truck has 90,000 miles. Fuel gauge wasn't reading We put a new fuel pump on, truck runs great but guage went to quarter of a tank and stayed there. Have added gas twice and gauge is still not reading. Shows quarter tank with 79 mile range and does not change.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1996 GMC Jimmy - Engine - 7/14/2014
    My car won't start when I turn the key.
    I attempted to jump start it, but the jumper box I have wouldn't quite turn it over...All I heard was a series of rapid clicks...Could there be something else wrong, besides a dead battery?
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1996 GMC Jimmy - Engine - 7/14/2014
    Car won't start when turning key.
    Tried to jump start it, but only got a lot of rapid clicks..Is this JUST a dead battery or is something wrong beyond that? The jumpstarter I used may not have enough charge, but did give the car enough boost to get the fast clicking sounds
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2005 GMC Yukon - Engine - 7/13/2014
    Why does my car crank but not start
    while going at 50 MPH the engine stalled. After coasting to a stop the car would crank but not start. The only message was that "stability system disengaged.
     
    • Chevy doctor
      7/13/2014 Chevy doctor
      Sounds like issue with fuel pump. Check and see if you have fuel pressure. You usually can here pump run when cycling key by hearing the whine noise. The stability system disengaged could be due to it stalling. There could be a yaw rate sensor issue. There has been issues with them in suburbans escalades and Yukon's in that year.
  • SD
    SD - 1987 GMC R1500 - Engine - 7/11/2014
    Fuel not passing through NEW injectors into the throttle body.
    Engine turns, fuel reaches injectors but does not spray into throttle. Additionally, I introduced "starter fluid" into throttle still no start. would assume that means no spark. This was a sudden onset issue, injectors were first thing I replaced. But felt ...
     
    • jdl
      7/10/2014 jdl
      With engine cranking, visually check for spark at the spark plugs. Also check for injector pulse. If you have neither, check for rpm signal. Check fuel pressure.

      Check for applicable trouble codes. Your obd1 so you should be able to check codes, yourself.
      jdl
      7/11/2014 SD
      Thanks JDL. I probably should have added that my level is of mechanical know how / talent would best be described as 'DEEP SHADE TREE". I can and will check for spark. I am assuming that I can check for injector pulse via a multi-meter (which oddly enough I own one) but will have to educate myself on its general use and specifically in this application. As far as the RPM signal and fuel pressure I am at a loss.
    • jdl
      7/11/2014 jdl
      To check fuel pressure on TBI fuel system, you need to tee a gage into the fuel supply line. Your local auto store should have one of these gages. Tell them it is for TBI fuel injection, TBI system has no Schrader valve.

      With a distributor system, the rpm signal comes from the pick-up coil goes to ignition module from ignition module to computer. If computer doesn't see an rpm signal, no injector pulse/ground.

      To check codes, you should be able to use jumper wire at the A & B terminals at the datalink connector. Turn key just till the dash lites come on, no further. The mil on the dash starts flashing, you count the flashes to get the codes. Your looking for two digit codes.
      jdl
      7/11/2014 SD
      Now that answers the question. I could not figure out the relation of the COIL to the injectors. I did the data link connection last evening and it revealed no error codes stored. Going to proceed with a coil replacement and start chasing the issue from that angle. Thank you sir.
    • jdl
      7/11/2014 jdl
      I haven't looked at your wiring, yet. With GM bypass ignition, with vehicle cranking, it is the ignition module that controls spark.

      If coil wire goes to distributor cap, you can remove wire from cap, hold close to engine ground, metal part of engine. Engine cranking you should see or hear the spark jump. If there is spark, the problem isn't the coil.

      If no injector pulse and no spark at the spark plugs. I wouldn't suspect the ignition coil unless you have more than one problem. The problem could be your ignition module? I can't be positive from here?
  • AutoMD Member
    AutoMD Member - 2005 GMC Envoy - Engine - 7/3/2014
    Key stuck in the ignition also car shuts completely off when I turn on the a/c
    check engine light is on gas gage works when it wants
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2005 GMC Envoy - Engine - 7/3/2014
    My key wont come out its stuck in the ignition also when I turn on my A/C my car shuts off completely please help
    check engine light on 2005 gmc envoy
     
    0 answer
 
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