Re: Rpm is high upon starting the car and does not...
Sounds like ur timing is too high..u should be around 900 in park and about 600 700 in idle in drive..i just payed 35 to get mine done cuz i dont havethetools:-/
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What Colorado do you have ? 2 wheel or 4 wheel drive ? Sport ,sport LS 3.5L , Z71, Z71 LS. etc. what size engine ? an does it have electronic throttle control ? I have factory service info an it is not showing that code .
DTC P0506
Circuit Description
The throttle actuator control (TAC) motor is controlled by the powertrain control module (PCM). The DC motor located in the throttle body drives the throttle plate. In order to decrease idle speed, the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate. If the actual idle RPM does not match the desired idle RPM within a calibrated time, this DTC sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0506 Idle Speed Low
DTC P0507
Circuit Description
The throttle actuator control (TAC) motor is controlled by the powertrain control module (PCM). The DC motor located in the throttle body drives the throttle plate. In order to decrease idle speed, the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate. If the actual idle RPM does not match the desired idle RPM within a calibrated time, this DTC sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0507 Idle Speed High
Cleaning the throttle body mite take care of it !
Cleaning Cleaning An Electronic Throttle Body Safely
I have a 94, and mine ran rough until I had a new computer control chip put in. The dealer doesnt sell then anymore, so you would need to get a reconditioned one (is that the right word?) from an auto parts store. I had to get this done twice because the first one was bad so they swapped it out. There was one more thing the former owner did to fix a rough run situation, I will post it when I find the receipt. Also, it smoothed out even more when I changed out the motor mounts. WAY less vibration. I love to drive this car now!
if your hearing a high pitched sound,it is probably your alternator working overtime to charge your battery,if it idles at a higher rpm,then someone tweeked ur idle speed,check under the hood,u can easily release using a wrench,
Yes, sounds like the idle speed is too high. If you keep driving like that, you will fry the torque converter / turbine. Since idle is computer controlled, you will have to take it for service tune up. There is one possibility that the rich, high rpm idle used for cold start is not disengaging properly after the engine warms up. Air conditioning will raise the idle speed by a couple hundred rpm, so avoid using it until you have the problem fixed. BTW.....warm engine rpm in idle, and neutral should be around 700-800. Anything over 900-1100 will result in a hard shift into 1st gear and dragging at stop lights.
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