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Chevrolet engine repair questions and answers

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  • Leo
    Leo - 2005 Chevrolet Silverado 1500 - Engine - 7 hours ago
    MY 2005 CHEVY SILVERADO IS LEAKING COOLANT FROM THE EXHAUST MANIFOLD WHERE IT BOLTS TO THE HEAD
    I HAD AN ISSUE WITH MISFIRE ON CYLINDER 8 BACK IN MAY 2014. FOUND THE #8 INTAKE ROLLER LIFTER HAD WORN A GROOVE IN THE INTAKE LOBE OF THE CAM. REPLACED CAM AND LIFTERS AND REWORKED HEADS. SOME OF THE EXHAUST MANIFOLD BOLTS BROKE OFF IN THE REMOVAL PROCESS AND HAD TO ...
     
    • Jimm
      7 hours ago Jimm
      Loss of coolant because of a coolant leak is probably the most common cause of engine overheating. Possible leak points include hoses, the radiator, heater core, water pump, thermostat housing, head gasket, freeze plugs, automatic transmission oil cooler, cylinder head(s) and block.

      Make a careful visual inspection of the entire cooling system, and then PRESSURE TEST the cooling system and radiator cap. A pressure test will reveal internal leaks such as seepage past the head gasket as well as cracks in the head or block. A good system should hold 12 to 15 psi for 15 minutes or more with no loss in pressure. If it leaks pressure, there is an internal coolant leak (most likely a bad head gasket but possibly also a cracked cylinder or engine block).

      It is important to pressure test the radiator cap, too, because a weak cap (or one with too low a pressure rating.

      1. Perform a cooling system / radiator pressure test when the engine is cold - as a first step to locate the leak.
      Obtain a loaner tool / free radiator pressure tester from the local auto parts stores such as Autozone, O'Reilly, NAPA, Advance Auto, or PepBoys. Follow their instructions and pump it to an adequate air pressure 12 -15 psi or the pressure rating listed on the radiator or reservoir cap. Observe the leaks and perform the repair.
      Note: do not over pressurize beyond the pressure allowed by the radiator cap, then test the radiator cap as well.

      2. Air pockets trapped in the cooling system can cause the engine to overheat. Some cooling systems have air bleed valves built into the system to aid in the removal of air pockets. Advice: For many cooling systems, the method of removing air pockets is to start the engine and allow it to run with the radiator cap off or loose until all the air escapes from the neck of the radiator. For some systems this method is not sufficient, and the manufacturer has installed air bleed valves usually near or on the thermostat housing.
  • joeycg
    joeycg - 2004 Chevrolet Cavalier - Engine - 3/30/2015
    Comes on. battery light comes on, checked alternator, charged battery and checked all good. battery light still
    was on the freeway this morning, rpms shot up for a moment with no speed up and then all of a sudden it stopped and the battery light went off, what is happening.
     
    0 answer
  • joeycg
    joeycg - 2004 Chevrolet Cavalier - Engine - 3/30/2015
    Battery light comes on, checked alternator, charged battery and checked all good. battery light still comes on.
    was on the freeway this morning, rpms shot up for a moment with no speed up and then all of a sudden it stopped and the battery light went off, what is happening.
     
    0 answer
  • mysharona63
    mysharona63 - 2013 Chevrolet Impala - Engine - 3/29/2015
    When I push the button to start all I get is clicking noises, everyrthing else has power
    car wont start bells and whistles works lights work but all I get is click click click
     
    0 answer
  • mark86
    mark86 - 2006 Chevrolet Cobalt - Engine - 3/29/2015
    It over headed and now will not start
    Maybe blown head gasket
     
    • CVO
      3/29/2015 CVO
      If it is a blown head gasket, the two adjacent cylinders 2 # 3 will have the same cylinder compression readings. Local auto parts stores such as Autozone or O'Reilly have a free loan tool program, check with them for a cylinder compression tester.
  • Radesi759
    Radesi759 - 2008 Chevrolet Silverado 1500 - Engine - 3/29/2015
    Truck won't start. Code came up was U 0109 #21 fuse (fscm) was blown and keeps blowing with key off
    Is the problem with the fuel system control module or something else?
     
    • Jimm
      3/29/2015 Jimm
      U0109 = Lost communication with fuel pump control module

      Possible causes
      - Faulty Fuel Pump Control Module
      - Fuel Pump Control Module harness is open or shorted
      - Fuel Pump Control Module circuit poor electrical connection

      There is a factory service bulletin for the following GMC models:

      2007-2010 GMC Sierra
      2007-2010 GMC Yukon Models
      2008-2010 GMC Sierra Hybrid
      2008-2010 GMC Yukon Hybrid

      GMC Factory Service Bulletin OBDII Code U0109

      Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module.

      These conditions may be caused by, but not limited to, any of the following:
      • The terminal(s) for the High Speed GMLAN Serial Data Bus has backed out of the 16-
      way electrical connector to the automatic transmission.
      • The terminal position assurance (TPA) lock in the transmission 16-way electrical
      connector is not fully seated.
      • The High Speed GMLAN Serial Data Bus circuits are open or shorted to ground.
      • Corrosion in various control module connectors.
      • Intermittent or poor connections in the inline connectors containing the High Speed
      GMLAN Serial Data Bus circuits.
      • The data link resistor is open or shorted.
      • Water intrusion in various control module connectors.
  • Mike
    Mike - 1982 Chevrolet K10 - Engine - 3/29/2015
    Whats wrong with my motor?
    Every morning i have to use starter fluid in order to get my truck to ignite. Alot people say it could be my choke, or the carburetor, or accelerator pump. I need help so i dont have use more for starter fluid anymore.
     
    • CVO
      3/29/2015 CVO
      A worn accelerator pump isn't squirted enough gas in the carburetor throat prior for the engine to start. The accelerator pump is inside the carburetor .Local auto parts stores or rockauto.com carry carburetor rebuilt kit.
  • macaw775
    macaw775 - 2003 Chevrolet Tracker - Engine - 3/28/2015
    Clicking noise by egr when car is parked and off
    2003 Chevrolet Tracker. Keys aren't even in it and it is heard clicking from under the hood at the egr valve and also under the dash driver side inside by the relay. This is when the car isn't even running. It is parked in front of the house. Any ideas?
     
    0 answer
  • Vexcore
    Vexcore - 2005 Chevrolet Uplander - Engine - 3/28/2015
    Where is the turn signal relay or flasher located on my car
    every site I have checked so far has given locations on other cars since they don't know how to read.
     
    • Jimm
      3/28/2015 Jimm
      The turn signal relay is in the fuse/relay panel under the instrument panel. The turn signal flasher may be plugged into the relay panel, or it maybe located just next to the steering column - also under the instrument panel.
  • Vexcore
    Vexcore - 2005 Chevrolet Uplander - Engine - 3/28/2015
    Turn signals not coming on
    I recently had to remove the fuse box under the hood to replace the wiper transmission. Now when I try to use the turn signals the indicator in the dash flashes fast but the bulbs do not turn on. They do turn on when I turn on the parking lights though. When I ...
     
    • Jimm
      3/28/2015 Jimm
      Check the turn signal flasher - loose mount or wiring, or the flasher itself may be faulty.
      Jimm
      3/28/2015 Vexcore
      I have been trying to find the flasher or turn signal relay and I'm starting to wonder If it's part of the bcm
  • Patricialeddy
    Patricialeddy - 2003 Chevrolet S10 - Engine - 3/27/2015
    Why do i have very little or no oil pressure when truck is running
    i have changed the oil and installed a new oil pressure switch truck has over 200,000 miles onit but was running fine
     
    • Teddy B
      3/27/2015 Teddy B
      Have to remove the oil pressure switch & put a gauge there to
      check the oil pressure

      Most likely the oil galleries are clogged or the motor is worn out
      & the oil gets past the cam bearings or the oil pump is also worn
  • Brian Hofherr
    Brian Hofherr - 2002 Chevrolet Monte Carlo - Engine - 3/26/2015
    Reset check engine light
    read codes / reset check engine light
     
    • Jimm
      3/26/2015 Jimm
      The check engine light is located on the dash and stays on if the computerized engine control system detects an engine performance or emissions problem.

      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Do not skip this important first step - there are literally hundreds of possible fault codes. Avoid wasting/ throwing money at the problem.
  • Superbased27
    Superbased27 - 1987 Chevrolet Caprice - Engine - 3/26/2015
    1987 Caprice having trouble Cold Starting
    Its always had problems with cold starts, but I think the choke on my carb isn t connected, there s no power wire. Where should the power wire run to, anything with 12v power? What would be a good choice Thanks http://tinypic.com/r/2z7eomx/8
     
    0 answer
  • Superbased27
    Superbased27 - 1987 Chevrolet Caprice - Engine - 3/26/2015
    1987 Caprice having trouble Cold Starting
    Its always had problems with cold starts, but I think the choke on my carb isn t connected, there s no power wire. Where should the power wire run to, anything with 12v power? What would be a good choice Thanks http://tinypic.com/r/2z7eomx/8
     
    0 answer
  • camk5
    camk5 - 1991 Chevrolet Blazer - Engine - 3/25/2015
    Blazer idles high. Bogs down. Repeats. Also high revs in gear even with break applied.
    hey i have a 91 k5 blazer. has the 350 in it. when i bought it in july i had no problem with it. around december i started experiencing a high idle. shortly after it started to almost bottom out after high idling. it would idle high, then bog down, then immediately ...
     
    • Jimm
      3/25/2015 Jimm
      Could be related to the IAC. Check these items / possibilities first; vacuum hoses/engine vacuum leak, low fuel pressure, leaking throttle body base gasket, faulty throttle position sensor (TPS), minimum air rate screw ("idle") setting on the TBI unit you have some work ahead of you to get this correct again - but you'll need to resolve the other issue(s) first as it requires an engine that is running correctly and a clean, properly functioning IAC. With a fully warmed up engine, and IAC closed completely and disconnected so it cannot affect the idle, general rule of thumb is to set the screw where the engine just barely idles on the edge of stalling...then reconnecting and resetting the IAC and allowing it to adjust idle beyond that.