HI idle . and loss of power while driving and engine still on .

2008 CHEVROLET OPTRA
100,000 MILES • 1.6L • 4 CYL • FWD • AUTOMATIC
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ALISALEH
  • MEMBER
  • 1 POST
1-starting the idle is not normal it stays hi (swinging revs 2500 to 3100) .
2-While driving (shaft on D Position) the engine sound goes hi (as if the gas peddle is pressed) the sound goes down (but still hi idle). Then
3-The car slows down to zero speed during that pressing on gas give no power to the car only the engine
respond . The shaft is still on D Position.
4- So the car stops ,the engine still on (with hi idle) To move on the car ,the engine must switch off and on again. The same repeats over again.
5- the above happens only when shaft on D .But not on 1 position.
6 the question is this an engine issue or a transmission issue ?
Note : the TSP is completely renewed but still getting error massages of PO123 and PO222
Apr 19, 2015 at 3:30 AM
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HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
you have a short to voltage and short to ground on these codes make sure the connector is on correctly then trace wires back to ecm to see if it's broken or touching metal someplace or poor connection. also clean throttle plate on both sides and iac hole with choke cleaner. check for a vacuum / air leak . you need a scanner to erase codes.
Apr 19, 2015 at 8:50 AM
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