Question about 2002 Chevrolet TrailBlazer

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Truck starts jerking at 60mph

I have a 2002 Chevy Trailblazer LTZ 4-wheel drive. At 58-60mph, the truck engine starts to become jerky like it is going to cut out and at the same time the heat gauge shows that the engine temperature is increasing. When I take my foot off the accelerator, the cutting out of the engine stops and the heat gauge shows that heat in the engine is decreasing. This problem happens whether it is a hot or cold engine and everytime the truck is driven. Has been happening for about 3 weeks and seems to be smelling more and more like something has been burned when smell the engine. The problem starts (that I notice anyway) at the 58-60mph speed. I've been told that 1) it is the transmission 2) a head gasket has blown 3) need a new catalytic converter. Does a head gasket have anything to do with engine combustion to maybe need a new engine or transmission rebuild or a new catalytic converter? I'm seeking your advice for a 4th opinion (this is becoming very frustrating for a single female on disability to know how to budget for a major repair on a very limited income!). I would appreciate your suggestion.

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  • nomadinmass Nov 02, 2008

    Thanks. This is more information than I've had before. Will take to a mechanic and see about more tests. Was hoping to avoid that as my income is VERY limited and I'm not mechanically inclined to do it myself. But I know what to ask for and won't sound too stupid acting like I don't have a clue as to what the problem is. Being a single woman, I try not to be taken advantage of. This is information has been extremely helpful.



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Its not the catalytic convertor its not the transmission and i dont believe you need a new engine.It does sound like the engine is getting hot though Have you had a TK head test done as head gasket is a possibility.The head does play a major part in the combustion process.but would not require a complete engine if its faulty as heads are easier and cheaper to repair than an engine would be.Its dificult to give you a definitive answer without the vehicle in front of me and a number of tests to determine the true cause.Are you able to remove the spark plugs to see if therse any indication of trouble,all the plugs should be the same color and not too different in any way.If one plug is noticably different then its likely that cylinder is having problems and will isolate which cylinder is giving you trouble.The fact that you can smell the engine usualy means its getting too hot for some reason wether its blocked radiator,faulty thermostat,fan not working or no water left in the radiator.Not sure with your model but some vehicles had the ability to shut itself down to protect itself if over heating occured.

Posted on Nov 02, 2008

  • tony yeatman
    tony yeatman Nov 02, 2008

    no worries and sorry it took so long to give you an answer.good luck



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Would like to talk with a car repair guru, not a computer guru

i think you have a combonation of problems here. most of it lead to needing a tune up .
just to get an understanding what is going on in your engine . i would bet to say that your enagine light is on . and probily an engine misfire code.
when the engine misfires somtimes it wil activate your knock sensor and ****** the timing thus raising your engine temp. if you havent flushed your coolant system yet you should. new plugs and wires and clean your throttle body.
good luck

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