2003 GMC Jimmy. v6 Vortec 4.3 liters. Question: I've owned the Jimmy for about three years, haven't had to do a tune up yet. I would like to know what i need to get it done. I have no major complaints to report. Being used to owning old vehicles that needed tuned at least once a year, kinda got spoiled with this GMC truck.

 

Answer: Nothing extra special to do on this truck than any other vehicle. A major tune up would require replacing the air filter, spark plugs, spark plug wires, distributor cap and rotor, fuel filter, PCV valve, inspect the ignition coil, check all fluid levels and condition. If over 100k miles, suggest getting the transmission fluid and filter changed, coolant flushed and brakes inspected, as well as front end and steering components. Inspect the belt for cracking and wear, check the tires and battery and inspect for any leaks.


1996 gmc jimmy 4x4. 4.3 Vortec.
Question: I am a truck mechanic but this has stumped me i hook up to my obd2 scanner the scanner powers up ok truck runs fine starts fine but obd says unable to find system engine light on airbag light on .

 

Answer: You have a Class 2 Serial Data Line problem. The power and ground work ok at the diagnostic port, but you've lost the serial data signal where the scanner can 'talk' to the vehicle. It can't find anything because it's getting no response on the data line. If you could pull codes, you'd probably find a few U1000 codes with loss of communication to whatever module can't connect with the others. This problem could be due to a broken wire, a bad connection, or even a bad module such as the PCM or SDM (airbag module). Since you have a check engine light and an airbag light, I'd start looking in that direction first. You can try disconnecting modules one at a time to see if the problem goes away and then you'd know what to replace or where your problem area is located.

 


    • No comments yet.

    Latest Articles

    1999 Dodge Neon Steering Hard

    Extremely hard to turn steering wheel p/s fluid full no visible leaks or damage to the ...

    Power steering hard to turn

    Extremely hard to turn steering wheel. P/S fluid full no visible leaks or damage to the ...

    2004 jeep liberty front ...

    I replaced my front drive shaft again and took it for test drive and it snapped again. Started ...

    Ford has trouble shifting ...

    MY 1992 FORD CROWN VIC STARTS FINE AND ALL THE FLUIDS ARE WHERE THEY ARE SUPPOSED TO BE BUT WHEN I ...

    Buick Century radio code 2001

    I can get the first 3 numbers by pressing the 2&3 button, however I cant get a second set of ...

    Log In Or Register
    ? The Benefits

    How Things Work

    Evaporative Emission System Operation and Components

    The Evaporative Emission (EVAP) control system limits the fuel vapors from escaping into the atmosphere. The EVAP transfers the fuel vapors from the sealed fuel tank to an activated carbon (charcoal) storage device (EVAP canister). The EVAP canister stores the vapors until the engine is able to use the extra fuel vapor. When the engine is able to use the extra fuel vapor,

    Read more...

    Common Engine Codes

    P0128 Coolant Temp Below Themostat Threshold

    An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the powertrain control module (PCM) for engine control and as an enabling criteria for some diagnostics.

    Read more...