Question about 1997 GMC Jimmy

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Misfires when cold but stops a little when it , warms up

Misfires when cold but stops a little when it warms up

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Check the plug wires to ensure they are properly seated onto the plug and the distributor ...it could also be due for a maintenance especially if you can bend the wires and see cracks ..also check all your vacuum lines and fluid levels as well may be due for a fuel filter change to many many other possibilities

if the check engine light is on or even if its not you may consider going to a parts store and using the diagnostic tool and see if any codes are stored
connect it to the underside of the drivers dash ( plug ) and turn key to the on position without starting it and press enter ..allow it to communicate with your vehicle and any codes stored write them down and if more than 1 scroll down with the down arrow and write them down too ...as long as you are at the parts store you will be able to discuss the issues and complexity of installing any parts or components needed from there

Posted on Feb 06, 2010

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Misfires when cold


Just means it isn't warmed up yet when sputters and misfires. Most likely a bad connection on the temperature sending unit in the engine or that sending unit is faulty. This sending unit tells the computer when engine is warm or cold and has to be functional. When working properly, it tells the computer to put engine in cold start mode, which it is not doing. The sensor is stuck in open position or warm mode and not giving the engine enough fuel when cold making it misfire and sputter. Fix that and you'll have no other problems with revving either.

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The most common causes of a skip or misfire is a bad plug wire[s] or spark plug[s]. Here's what I look for whenever I do an initial test drive to verify a misfire, stumble, or skip complaint. Once the motor is warmed up I get up to about 48 mph. At that speed the transmission is in 4th gear and the torque converter clutch is locked up giving the engine a solid connection to the drivetrain so any little skip can be felt [you usually can't feel a misfire unless the Torque Converter is locked up due to the fluid drive dampening the sudden but brief change in crankshaft speed during the misfire] Once I'm at 48mph I ease into the throttle just as much as I can without the transmission downshifting. This combination gives you the leanest fuel condition, the highest spark load on the ignition system, and a solid engine to drivetrain connection which makes catching a misfire quite easy. With a little practice at this they'll stick out like a sore thumb. I RARELY have to replace a coil on a 3.3L but often have to replace plug wires and plugs. Look for black soot like coating in the far end of the plug wire boots, rusty or corroded coil towers [where the plug wires attach to the coils] or worn spark plugs. 9 out of 10 times that's where I find the problem. If you're handy with an ohm meter you can test the plug wires and should find about 1,000 ohms per inch of wire. The reason most misfires aren't felt on a cold engine is due to how rich the fuel system has to be to keep a cold engine going and its far easier to fire a cool/rich fuel mixture than a hot/lean mixture. You usually can't feel them during fast/hard acceleration for the same reason and the torque converter clutch is usually disengaged during both of these types of operation.

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Check your ignition components, spark plugs, wires, if they are in good shape. Check with Ford technical service bulletins. There is a TSB for the upper intake plenum gaskets leaking when engine is cold. The TSB also has a reflash for the Engine Control Module.. I tried just doing the upper intake gaskets and so far so good. The reflash (reprogram your original computer) has to be done at the dealer. Hope this helps..

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