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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Posted on Jan 02, 2017
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May 20, 2014 | 1989 Toyota Camry
Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.
To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.
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