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Chevrolet engine repair questions and answers

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  • Maize
    Maize - 1999 Chevrolet Blazer - Engine - 4/25/2015
    Trying to get home from Dallas
    Car barely runs. Code p0122 (low tps voltage). Checked voltage going into tps, only 0.2 volt with key on (supposed to be 5v). What would happen if I were to splice into the mat sensor (it DOES have the correct 5v) and run a wire to the tps? Would that get me the 400 ...
     
    • jdl
      4/25/2015 jdl
      I'd probably use the ref voltage off the map sensor. The gray signal wire at the tps, I'd leave a pigtail and clip that wire, the loose piece make sure it can't ground. Use jumper wire from map ref voltage to tps gray wire. I can't guarantee anything.

      Many years ago, I had a vehicle quit on me about a 100 miles from home. I knew what the problem was but, couldn't fix it on the side of the road. I called a tow truck, I can't remember exactly what it cost, a couple hundred, maybe? It was worth it to me.
  • Tom Ball
    Tom Ball - 2009 Chevrolet Impala - Engine - 4/25/2015
    Display: engine hot a/c off temp guage on cold. Not really overheating
    65000 miles. replaced temp sensor. Only comes on when eng. is cold. Clear code and runs ok all day
     
    0 answer
  • micahsethkaminer101
    micahsethkaminer101 - 1998 Chevrolet Cavalier - Engine - 4/24/2015
    Im running the car and the the gas pedal stops working the steering wheel freezes up and the engine oil and battery ligh
    light comes on. whats going on any ideas????
     
    0 answer
  • acidreflux247
    acidreflux247 - 2000 Chevrolet Silverado 2500 - Engine - 4/24/2015
    Do i need to have the ac condenser replaced even though they said they flushed it before they replaced the compressor?
    Having trouble believing the auto repair shop.This will be the 4th time I have taken my truck to this repair shop to have the ac compressor fixed under warranty. every time its the same thing, bearings , and god awful noise. Now they say they have to replace the ...
     
    0 answer
  • poormansek
    poormansek - 2001 Chevrolet Impala - Engine - 4/23/2015
    Why is my engine chugging and bucking?
    Replaced right side cylinder head with reman. New head gasket, lower and upper intake manifold gasket, throttle body gasket, plugs and wires and coil pack for cylinder 3 and 6. Sounds like air sucking some where on the left head exhaust side? No CEL or codes being ...
     
    0 answer
  • Maize
    Maize - 1999 Chevrolet Blazer - Engine - 4/22/2015
    Can the EGR be bad but not set a code?
    Stalling and/or rough idle. EGR engine codes not showing up. Cleaned MAF sensor (Yes I used the correct MAF sensor spray), Cleaned IAC, changed the PCV, MAP sensor, and TCP. Sprayed carb cleaner everywhere and found no vacuum leaks. All wiring looks ok. No leaks ...
     
    • Jimm
      4/22/2015 Jimm
      Yes, it is possible for the EGR valve to be faulty without setting a code.

      Possible symptoms of EGR trouble:

      - Rough idle and rough part throttle operation (valve opening too easily or stuck open)
      - May stall during transition from idle to part throttle (valve opening too easily or stuck open)
      - Noticeable pinging (detonation) especially when engine is under load (valve inoperative)
      - Trouble code 32 (valve inoperative)
      - Hard or no start although fuel and spark are present (valve stuck wide open)

      Possible Failure Modes:
      - The vacuum supply from the TBI unit to the EGR solenoid can be disconnected, broken, clogged, or incorrectly connected
      - The EGR solenoid can be faulty or the electrical connection to it can be missing or damaged
      - The vacuum supply from the EGR solenoid can be disconnected, broken, clogged, or incorrectly connected
      - The EGR valve can be faulty, clogged, or the incorrect part for the application
      - The EGR passages in the intake can be clogged with carbon

      The most common EGR system failure is the valve itself; the diaphragm fails so the EGR valve will not open. You can eliminate this possibility right off the bat by testing the valve with a vacuum tester (Mityvac.) Shut the engine off and connect the tester directly to the EGR valve. Pull vacuum (around 15 inches is plenty) and be sure it holds for a minimum of 20 seconds. If it does not build or hold vacuum, the valve could be held open by a chunk of carbon, which you could attempt to clean out - but most likely, the valve is bad and needs to be replaced.

      If the valve passes the hold test - with vacuum still showing as holding on the tester, have a helper start the engine while you watch the gauge. The vacuum should bleed off immediately.

      Determine whether the EGR passages in the intake are clogged by carefully depressing the EGR diaphragm with your fingers. Take care to not burn your fingers or get them caught in the openings under the EGR. When you press the diaphragm, the engine should stumble noticeably, and possibly stall. If there is little or no response, the passages in the intake are likely clogged with carbon. Effective cleaning of these passages requires removal of the intake manifold.

      Check the vacuum source to the EGR solenoid. Connect a vacuum tester (Mityvac) to the line leading from the TBI unit to the front (single port) side of the solenoid. There should be full vacuum at idle, around 20 inches/Hg on a stock engine. If not, remove the line from the TBI and connect the tester directly to the TBI to verify vacuum. If none, the port itself may be clogged.

      Reconnect the line from the TBI to the solenoid and move the tester to the line exiting the rear of the solenoid. At idle there should be NO vacuum reading (be sure you purged your gauge if necessary so that it reads zero before connecting.) Snapping the throttle should show some activity on the gauge as the solenoid briefly commands the EGR open.

      With the meter set on ohms, you can test the EGR solenoid coil across the two pins in the socket; any reading less than 20 ohms indicates a bad solenoid winding.

      With the meter set on DC voltage, or using a test light, check the EGR solenoid harness terminal A (pink/black) to ground. Key on, meter should read 12V or the test light should light up. Do not pierce the wire to test, simply unplug it and touch the test lead to the connector pin.

      Another possible failure that is difficult to test for is a weak spring inside the valve allowing it to open too easily. If you have exhausted all other efforts you may consider replacing the valve.

      Be sure the spot you're using as a ground reference is a good connection, by touching your positive meter lead temporarily to the positive battery terminal.
  • sam
    sam - 1989 Chevrolet K1500 - Engine - 4/22/2015
    Truck boggs and low on power
    i recently rebuilt the 89 350 in my silverado. when i start it and idol it runs great. timing is good and all my fluids are good.when i drive it it bogs at low rpms and has no power. when it finally works itself upto higher rpms it feels semi normal but then when it ...
     
    • jdl
      4/22/2015 jdl
      Have you ever checked proper fuel pressure. and volumn at higher rpms. Your exhaust system isn't clogged any?
      jdl
      4/22/2015 sam
      it runs fine when it gets to higher rpms. its at low rpms when it has trouble.
      jdl
      4/22/2015 jdl
      You said it runs fine at idle, idle is about as low rpm as you can get. Can you check for applicable trouble codes? Your obd1, you should be able to check codes, yourself, if there are any.

      All I could do is check the basics.
  • art
    art - 2004 Chevrolet Impala - Engine - 4/22/2015
    Car runs fine then when you park sometimes you try to start it and it is dead. Put new battery and still does it .
    Had a diagnostic done no draw on the battery but the car is dead dead it needs a jump to start. Just happened today and had to jump it to start but brand new battery and tested it and it had plenty of power just would not crank the car over. So it's not the battery ...
     
    • jdl
      4/22/2015 jdl
      Can you check voltage and ground for the starter circuit? Use a digital multimeter. One circuit is battery voltage, hot all the time. The other circuit goes hot with key in the crank position. You may have to check actual voltage reading in case of voltage drop. Your battery cables are all good?
      jdl
      4/22/2015 jdl
      http://s21.postimg.org/acderyxqv/starter_circuit.jpg

      Click on the link for starter wiring. Don't know if you can read it? Autozone has free wiring diagrams, so does bbbind.com.
  • stan
    stan - 1992 Chevrolet K1500 - Engine - 4/21/2015
    Head gasket replacement in 92 Chevrolet 4.3. 4#4 truck
    Head gaskets thermostat engine flush check for cracks reinstall
     
    • Jimm
      4/21/2015 Jimm
      Is there any question in this detail?
  • swashman3
    swashman3 - 2005 Chevrolet Impala - Engine - 4/21/2015
    I am getting trouble codes p0300,p0128 and p0455 after a head gasket replacement.
    I took my car to a shop to have the head gasket replaced. Afterwards they gave it back to me saying it's not right yet and they think the fuel injectors are bad. They wanted me to drive it with some cleaner in the tank. The changed the plugs, wires and made sure the ...
     
    0 answer
  • swashman3
    swashman3 - 2005 Chevrolet Impala - Engine - 4/21/2015
    I am getting trouble codes p0300,p0128 and p0455 after a head gasket replacement.
    I took my car to a shop to have the head gasket replaced. Afterwards they gave it back to me saying it's not right yet and they think the fuel injectors are bad. They wanted me to drive it with some cleaner in the tank. They changed the plugs, wires and made sure ...
     
    0 answer
  • kym walker
    kym walker - 2011 Chevrolet Malibu - Engine - 4/21/2015
    My key remote will not unlock my car, I have changed to battery,but the remote still will not unlock my door.
    My key remote will not unlock my car, I have changed to battery,but the remote still will not unlock my door.
     
    0 answer
  • kym walker
    kym walker - 2011 Chevrolet Malibu - Engine - 4/21/2015
    My key remote will not unlock my car, I have changed to battery,but the remote still will not unlock my door.
    2011 Chevy malibu
     
    0 answer
  • Ramiro Cardenas
    Ramiro Cardenas - 2008 Chevrolet Tahoe - Engine - 4/20/2015
    Why does my car make a pulling motion when I press on my breaks?
    It doesn't happen all the time but when I press on my breaks when I'm slowing down for a red light, for example, the car shakes and makes a pulling motion as I slow down. It almost feels as if the car has a hiccup. The car has an electric battery so perhaps it has ...
     
    0 answer
  • Ramiro Cardenas
    Ramiro Cardenas - 2008 Chevrolet Tahoe - Engine - 4/20/2015
    Why does my car make a pulling motion when I press on my breaks?
    It doesn't happen all the time but when I press on my breaks when I'm slowing down for a red light, for example, the car shakes and makes a pulling motion as I slow down. It almost feels as if the car has a hiccup. The car has an electric battery so perhaps it has ...
     
    0 answer