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I posted this on another forum, but I'd like to get it resolved as soon as possible, so I need all the exposure I can get.
I have a 1995 3.4 5-speed camaro with 88000 miles. About a month ago, every time I started the car when it had cooled completely, as at the start of the day, it would idle very poorly when I pushed the clutch until the coolant temp had exceeded 160 degrees. The tach needle would jump from as low as 400 rpm to as high as 1100 of its own accord. If I let off the clutch pedal it would idle normally, and if I revved the engine with the clutch down it would rev normally. Again, once warmed to above 160, it would operate normal all the time. I was advised to replace the 24x crank sensor, and did so, and the problem vanished.
Now, a week or so later, it's back, only now it idles even worse (even has stalled) and keeps idling badly when the clutch is depressed until coolant temp reaches about 180. I should also note that the engine has always been slow to drop rpms when revved or even when shifting gears; it usually takes a second or two to change rpms at all when I put the clutch in to shift. This improves when the car is warmer. I have had intermittant SES lights and security lights, and regularly get around 21.5-22 mpg city driving with normal shifting at or before 2500 rpms. The car has new plugs and wires, a new fuel filter and pcv valve, new oxygen sensors, and a new 24x crank sensor. I have run fuel injector clearner through the system and cleaned the throttle body as well.
Does anyone know what I'm dealing with? Even when it's working normally, the car isn't as smooth as I'd expect a low mileage computer-fuel-injected car to be, particularly at idle. I'd appreciate anything anyone can give me. Thanks!
I have a 1995 3.4 5-speed camaro with 88000 miles. About a month ago, every time I started the car when it had cooled completely, as at the start of the day, it would idle very poorly when I pushed the clutch until the coolant temp had exceeded 160 degrees. The tach needle would jump from as low as 400 rpm to as high as 1100 of its own accord. If I let off the clutch pedal it would idle normally, and if I revved the engine with the clutch down it would rev normally. Again, once warmed to above 160, it would operate normal all the time. I was advised to replace the 24x crank sensor, and did so, and the problem vanished.
Now, a week or so later, it's back, only now it idles even worse (even has stalled) and keeps idling badly when the clutch is depressed until coolant temp reaches about 180. I should also note that the engine has always been slow to drop rpms when revved or even when shifting gears; it usually takes a second or two to change rpms at all when I put the clutch in to shift. This improves when the car is warmer. I have had intermittant SES lights and security lights, and regularly get around 21.5-22 mpg city driving with normal shifting at or before 2500 rpms. The car has new plugs and wires, a new fuel filter and pcv valve, new oxygen sensors, and a new 24x crank sensor. I have run fuel injector clearner through the system and cleaned the throttle body as well.
Does anyone know what I'm dealing with? Even when it's working normally, the car isn't as smooth as I'd expect a low mileage computer-fuel-injected car to be, particularly at idle. I'd appreciate anything anyone can give me. Thanks!
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