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Oldsmobile engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 1989 Oldsmobile Delta 88 - Engine - 5 hours ago
    Car refuses to start.
    The problem was hit and miss acted like no gas so replaced fuel pump and filter. Car started right up and ran for 100 miiles or so. Tried to start the next day and nada. Replaced crank position sensor hoping that was the issue that was causing the intermittent ...
     
    • jdl
      5 hours ago jdl
      If it cranks good but won't start, have a helper crank it, while you visually check for spark at the spark plugs. If spark everywhere, check fuel pressure. Also check for injector pulse. I realize you replaced the pump, regardless, the pump needs voltage and ground to run.

      Any applicable trouble codes? Your obd1 so you should be able to check codes, yourself
  • AutoMD User
    AutoMD User - 2002 Oldsmobile Alero - Engine - 7/9/2014
    Rough idle when a/c is on
    Car idles rough when a/c is on at a stop. Otherwise, runs fine. Replaced idle control valve and still same problem
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1990 Oldsmobile 98 - Engine - 6/30/2014
    Why does it take 15 minutes for compressor to engage? Once engaged- works fine until car turned off.
    When restarted, process starts over again. (another 15 minutes) Replaced radiator and electronic climate control. Can;t figure it out.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1990 Oldsmobile 98 - Engine - 6/30/2014
    Compressor won't engage when started, but will come on after driving 15 minutes.
    Air works fine until I kill engine. When started again, process starts all over again.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2000 Oldsmobile Alero - Engine - 6/30/2014
    Car won't start. Turn key on, fuel pump comes on and then when key turned it turns off everything and pops trunk
    Car was up on jacks to fix a brake line issue and when set down and put everything back in place all seemed to work fine, gauges all work, lights all come on like normal on dash, fuel pump kicks on and stops after pressure build up, lights inside are all fine and ...
     
    • jdl
      6/30/2014 jdl
      If your saying the starter won't crank, make sure the battery has a full charge and the battery connections are good. Next, check voltage and ground at the starter motor. The large cable at the starter is battery voltage, hot all the time. The purple wire that goes to starter solenoid S terminal goes hot with key in the crank position.

      You could have more than one problem, but, according to my wiring info neither the pcm or security has control over the starter motor.

      Any testing at the starter, make sure tranny is in park or neutral and the parking brake is set, level ground.
  • AutoMD Member
    AutoMD Member - 1998 Oldsmobile Aurora - Engine - 6/20/2014
    Ticking sound .. lights flickering even when the key is out .. killing my battery
    I have been hearing a ticking sound in the dash area and my daytime lights are flickering even when the car is off .. its killing my battery .. someone online said it was the light control module that controlled the daytime running lights .. I replaced that part and ...
     
    0 answer
  • Jim
    Jim - 2000 Oldsmobile Bravada - Engine - 6/18/2014
    What do these compression readings mean?
    I did a compression test and checked the plugs for fuel and made sure they were sparking. All of the plugs had spark and all of them smelled like fuel, but there was not any fuel dripping off of the plugs. 1, 3, and 5 were clean while 2, 4, and 6 (the ones running ...
     
    • Chevy doctor
      6/17/2014 Chevy doctor
      The only thing I can think is that the fuel pressure regulator is leaking and the fuel I washing down passenger side bank cylinders causing a rich condition and higher compression readings.
    • GT500Knights
      6/18/2014 GT500Knights
      Is your engine a single or dual overhead cam type? Or the cam-in-block type? If I know your car correctly it may be like my 94 Chevy--cam in block. My thinking is that if your engine is the overhead cam type, then it's possible that the chain on that side, the tensioner, and/or guide may be bad, causing excessive slack in valve timing and throwing off the compression on that entire bank.

      Try running the compression test without fuel pressure. Disconnect the fuse/relay for the pump and try again to see if the fuel itself is actually having an impact on compression readings. If your vehicle has injectors, the it's possible the rail may be clogged preventing adequate pressure and volume to run those cylinders. If your have the cpi setup, driver side leaking injectors indicate a nut set, passenger side requires a regulator.

      It is possible that the head itself on that bank is warped enough to affect all three cylinders.... Same goes with head gasket.
      GT500Knights
      6/26/2014 Jim
      I checked the compression without the fuel pump fuse and it was the same.
  • AutoMD Member
    AutoMD Member - 1992 Oldsmobile 98 - Engine - 6/16/2014
    Why do my car stall sometimes?
    It cut of the other day. Called for a jump. By the time I could jump it I just checked to see if it would turn and it started. One mechanic said it's the Spark Control Module. One said Mass Airflow Sensor, and I think it's the starter gone bad. Could you help me ...
     
    • GT500Knights
      6/16/2014 GT500Knights
      It's possible your problem is due to the ignition control module. sometimes those can get too hot and not function properly. has it ever been replaced? either way, i would pull it off, and place down some silicone grease where it mounts to the distributor, it needs a means of heat transfer.

      doesn't seem like this would be a maf issue. don't rule it out though.

      I would test out the ECT, if it is sending the incorrect readings on temp back to the ecm, then the ecm will not know the precise amount to set injector pulse width too.

      pull the codes before doing anything else
  • AutoMD Member
    AutoMD Member - 1992 Oldsmobile Cutlass Ciera - Engine - 6/14/2014
    Car has always started fine.left radio on battery died now car wont keep a charge why is that?
    car has a grp size 75 with 650 cca
     
    • Chevy doctor
      6/14/2014 Chevy doctor
      Battery may just have to be replaced. Sometimes drawing a weak battery down causes battery to reach a state where it does not hold its integrity. Try battery first and make sure alternator is charging.
  • Jim
    Jim - 2000 Oldsmobile Bravada - Engine - 6/14/2014
    Why is one side of my motor misfiring?
    My motor has been misfiring. In uplugging one spark wire at a time from the distributor cap, I found that bank 1, 3, and 5 are not working. The engine runs the same with all three of those wires unplugged!!! What are some possibilities? I have already replaced all ...
     
    • bear.1216
      6/14/2014 bear.1216
      First check that 1 3 and 5 are sparking. Let it run with wires unplugged. Then remove plugs. Inspect the plugs for fuel. If the wires were unhooked. The plugs should be soaked with fuel. If they are dry. you are not getting fuel. When the plugs are out. I would also check compression. Diagnosis would depend on the results of those tests. If they are sparking then you should also check the base ignition timing with a timing light. Check the oil for signs of a blown head gasket. Or it could have a bad fuel injector. Is the vehicle throttle body or multiport injected. If it is TBI. Just look and make sure the injectors are spraying. If MPI you will have to test each injector. Reply after these basic tests and I can help more. You should also scan it for diagnostic codes and post any codes that you retrieve.
      bear.1216
      6/17/2014 Jim
      Okay, I did a compression test and checked the plugs for fuel and made sure they were sparking. All of the plugs had spark and all of them smelled like fuel, but there was not any fuel dripping off of the plugs. 1, 3, and 5 were clean while 2, 4, and 6 (the ones running the entire engine at this point) were black. The cylinder pressures were as follows: 1-90, 3-95, 5-90, 2-155, 4-160, 5-135. That is all I have for now...Open to all observations.
      bear.1216
      6/17/2014 bear.1216
      1 3 and 5 are a little weak on compression. I would move on to a leakdown test to see where you are losing pressure. To affect all 3 cylinders on one side. I would look towards the head gasket, piston rings or oiling system. In addition to a leakdown test. Take a look at the oil pressure and condition. Does the oil smell heavily of fuel. Or thick with sludge. Or milky with antifreeze. Excessively high or low oil pressure. Is the check engine light on.
    • Chevy doctor
      6/14/2014 Chevy doctor
      Being that its one bank. I would try swapping oxygen sensors first or try a new one. Second test for back pressure from exhaust on that bank. 3rd replace your intake gaskets. These 3 failures are what causes a bank to misfire.
  • AutoMD Member
    AutoMD Member - 1992 Oldsmobile Cutlass Ciera - Engine - 6/14/2014
    Car has always started fine.left radio on battery died now car wont keep a charge why is that?
    car has a grp size 75 with 650 cca
     
    0 answer
  • Jim
    Jim - 2000 Oldsmobile Bravada - Engine - 6/11/2014
    What is causing "multiple random misfire"
    My Bravada has 160,000 miles on it. The serpentine belt broke the other day because of a tensioner that went out. I tried to limp it too far and overheated the engine pretty badly. I replaced the tensioner and the belt and the engine ran but was misfiring. The ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1997 Oldsmobile Cutlass Supreme - Engine - 6/7/2014
    Having intermittent starting problem and alot of misfiring. What could be wrong?
    At first it was taking 3-4x to start but after it started it ran fine. The cam sensor was replaced but the problem continued. When I brought it back to the shop they said the car had misfired over 200x in the last week but no codes were showing up that would make ...
     
    • Chevy doctor
      6/7/2014 Chevy doctor
      Check the fuel pressure regulator for it to be leaking through vacuum lines.. These vehicles are notorious for bad injectors. Ohm test the injectors, they should be all within less than 1 ohm of one another.12 to 13 ohms.
  • AutoMD Member
    AutoMD Member - 2001 Oldsmobile Alero - Engine - 5/31/2014
    Why will my engine crank and spark but not run? I can hear fuel pump, smell gas, and ignite quick start fluid.
    Vehicle is high milage, 380,000km. Car has ran great, no problems for months. Drove it 6 hours ago, parked it with no problems. I was scheduled for an emissions test so I cleared the DTC codes with an OBDII scanner. I had 2 codes (neither are new), one for ...
     
    • jdl
      5/31/2014 jdl
      Engine cranking, did you check for fuel injector pulse?
  • AutoMD Member
    AutoMD Member - 1997 Oldsmobile Achieva - Engine - 5/29/2014
    97 Achieve won't start. Please help
    Not sure if the engine type I selected is right, but it's a 4 door. Please forgive me for my lack of car knowledge. I had a fuel pump replaced in my car last year. It sat at the mechanics for a few months until I was able to pay for it. He let the battery go ...
     
    • jdl
      5/29/2014 jdl
      I'd use a digital multimeter across the battery posts, everything off, take reading. The generic spec for a full charge is 12.6 volts. If the battery is down take it off and get it charged. Also check your charging system if you can get it started. Have you tried jumper cables to get it cranking? Be careful with the jumpers.

      If it cranks good but won't start, have a helper crank it, while you visually check for spark at the spark plugs. If spark everywhere. use a gage and cherck fuel pressure.

      If just a low battery issue, you could try a battery tender, it may keep the battery charged if the sits for a long time. Hopefully it is a floating tender that will turn on and off according to battery charge.
      jdl
      5/29/2014 AutoMD Member
      I hooked it up to my girlfriend's mustang and let it set for 5 or ten minutes and it still wouldn't turn on. It's not clicking or anything. I turn the key to start it and nothing happens. There is power in the car, the lights come on and everything. The security light is not on. Where do I need to look at the spark plugs to see if they're firing? I am inclined to believe it's something relatively simple, as I said it's just been sitting. Just don't know enough about cars to just go start messing
 
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