Question about 1999 Chevrolet Cavalier
My daughter's Z24 with 2.4L 4 cylinder runs rough and hesitates when at part-throttle. Under full throttle and idle the car runs smoothly.
This car does not have plug wires, rather a coil housing under an engine cover. The coil housing showed continuity from each coil pick up to each spark plug connector; I think it is ok. Installed new plugs. Replaced one of the coil packs: 1 looked newer than the other, so I replaced the old-looking one. I did use the dielectric grease on the 8 connector springs. The local parts store cannot check the ignition control module and a new one costs $170. Anyway, my question is what should I be looking for to clear up this hesitation? Thank you for any help you can provide.
I'd check the throttle position sensor before going anywhere else. Your problem is right in the middle of the rpm range, right where the most wear on the tps happens.(assuming a 2,000 rpm average crusing rpm) An ignition or fuel problem generally shows up first at high rpm's where the load is greatest.
Posted on Jan 09, 2009
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