Strange Idle Problem

Guest · Post by **Guest** » Mon Apr 24, 2006 12:52 pm

my little brother has a Chevy Beretta (95). When he go's to start it....the thing idles like it's running 100 miles per hour nothing we do will make it idle down....I check under the hood the throtles not stuck. Any Ideas what to start looking for? Also something strange....It will allow you to put it in gear (reverse) and it's all the breaks can do to keep it from racing off...but when you put it in drive nothing happens.....just the super idle. Any help on this would be great.

Jeff P · Post by **Jeff P** » Tue Apr 25, 2006 9:58 am

First thing I'd look for is broken, cracked, or disconnected vacuum lines/tees. It's also possible there is a carbon build-up on the Idle Air Control Valve or the throttle plate (inside the throttlebody). The Throttle Position Sensor may be bad or misaligned causing the car to think the accelerator is pressed in a little bit. What do you mean by "when you put it in drive nothing happens?" Does it not shift into Drive or does it not try to take off like it does in Reverse? I know you said the throttle isn't stuck, but it might be a good idea to spray some penetrating oil on the throttle springs/pivots at least as preventative maintenance

Guest · Post by **Guest** » Tue Apr 25, 2006 10:41 pm

Thanks for your reply jeff....when he puts it in drive it dosen't want to shift into drive. Really strange it all happened over night. He said it was running great, then the next day it started dong this.

Jeff P · Post by **Jeff P** » Thu Apr 27, 2006 5:04 am

If the problem is just in Drive, not 2 or 1, the manual lists possible problems as oil level, forward clutch, and case cover (basically internal leaks). If the problem is in Drive and 2, the manual lists a possible problem as driven sprocket support - sleeve turned. If the problem is in Drive, 2, and 1 the manual lists possible problems as oil pressure, manual linkage, driven sprocket support, case cover (oil passage leak), forward clutch, or control valve assembly. Obviously the easiest thing to check is ATF level. Turn the car on and let it get up to normal operating temperature. Shift through the gears, pausing at each, then shift back into park. Check the fluid with the engine still running. Low oil level would be a problem. High oil level typically isn't. I agree, it's definitely a strange problem. I hope he's not relying on the car to get anywhere

Edit: Oh, by the way, does this happen when only when the car is cold or also when it is warmed up?

MAD MARK · Post by **MAD MARK** » Fri Apr 28, 2006 5:46 pm

Could be a bad TPS.

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