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.

 


Leave your comments

Post comment as a guest

0

    Comments
    Subscribe To These Comments-----   

    • No comments yet.

    Latest Articles

    Crown Vic ECM Location P0112 ...

    Can you please tell me where the PCM is located on a 1997 ...

    Ford Focus Gear Shifter ...

    So I Have A ford Focus 2009 and the other night I got a ...

    2001 Chevy Malibu ESC Code

    Have a 2011 Chevy Malibu my wife was telling me the code ...

    Chevy Malibu TPS Low Voltage ...

    2000 Malibu 3.1l shows TPS low voltage code. I replaced the ...

    Chevy Impala Thermostat Was ...

    i have 2005 Impala the thermostat was stuck to where it ...

    How Things Work

    Exhaust Recirculation System - Known As EGR Valve

    The Exhaust Gas Recirculation (EGR) system is used to lower Oxides of Nitrogen (NOx) emission levels caused by high combustion temperature. It does this by decreasing combustion temperature.

    The main element of the system is the linear EGR valve. The EGR valve feeds small amounts of exhaust gas back into the combustion chamber. With the fuel / air mixture diluted by the exhaust gases, combustion temperatures are reduced.

    Read more...

    Common Engine Codes

    Code P0420 Catalytic Converter Failure

    To control emissions of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx), a three-way catalytic converter is used. The catalyst within the converter promotes a chemical reaction which oxidizes the HC and CO present in the exhaust gas, converting them into harmless water vapor and carbon dioxide. The catalyst also reduces NOx, converting the NOx to nitrogen.

    Read more...