Question about 2002 Chevrolet Malibu

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2002 Chevy Malibu 6 cyl - hesitates and sputters, lags on hills

My wonderful Chevy 2002 Malibu 6 cyl has been spurting (hesitating) and whistling (when I accelerate) for several weeks. I've been trying to get it diagnosed so that possibly my son can replace whatever is wrong with it.At 20 mph it runs ok for a few minutes, and then after that at 30 mph it really hesitates, and sputters, won't get up and go, sort of jerky. On the highway at when it finally makes it to 60 or more it runs ok until I go up a hill and then it immediately goes to 50 mph and that is is fast as it will go, with medal to the pedal.We changed thes sparks plugs, put new spark plug wires on it, cleaned the Mass air flow sensor, put a clean air filter and changed the oil.Someone put it on a diagnostic machine and came up with these codes. 300 - 404 -207 - 500 - 600Any ideas. Can't take it to a shop, no cash, lost job.Thanks

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  • Richard Scordino May 25, 2010

    Not going to even try to give you an answer on that one. I do recommend you get a chilton (not haynes) manual and go over the codes. You will also need a decent multi-meter to use for testing. To guess, you may have a partial short or bad connection at the computer causing cylinder mis-fire. But, careful testing is the only way to actually determine that or anything else...Book and meter are less expensive than any wrong part you can buy on a "guess".

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I just went through the same thing for my 2002 and it was the catalytic converter. Make sure if you do have to replace it, it has a warrenty . The after market I put on didnt last more than a few months before it went out again.

Posted on May 28, 2010

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