P0325 diagnostic code. Need help!

Tiny
DIRTDIGGER
  • MEMBER
  • CHEVROLET BLAZER
We have a 1995 Chevy Blazer. We recently had the exhaust system replaced (all but the catalytic converter, which was fine), plugs, wires, oil change, fuel filter replaced. It turns over a little slow, cranking several times before starting, but once it's warmed up it revs very high, then very low and sometimes stalls out. Highway driving is fine, but when you come to a stop sign or light you notice the idling problems. It was put on a diagnostic tester and code P0325 Knock Sensor 1 Circuit Malfunction came up. Would the knock sensor malfunction cause the vehicle to rev high then low like this? It almost feels like you have your foot on the brake and are giving it gas at the same time. You can feel the blazer jerk like it's going to take off on its own. We are not car repairman and don't do our own work on vehicles, other than oil changes. Is this something costly to repair at a garage? Any suggestions as to what we can do or other things to check before we call the garage would be greatly appreciated. We want to come across somewhat knowledgeable so we aren't taken advantage of at the garage. Thanks!
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Tuesday, April 3rd, 2007 AT 10:24 PM

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Tiny
SNOWMAN_31_ISCOOL
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  • 3 POSTS
ANY TIME YOU HAVE A TROUBLE CODE COMING FROM YOUR CARS COMPUTER SYSTEM IT COULD BE THE ROOT CAUSE TO YOUR PROBLEMS, BUT SOMETHINGS TO LOOK FOR THAT MAY BE HIDDEN CAN BE AN IDLE AIR SENSOR AND A THROTTLE POSITIONING SENSOR. BOTH ARE DIRECTLY RELATED TO THE THROTTLE AND FUEL SYSTEM. I COULD BE MISTAKEN BUT ALSO HAVE SOMEONE CHECK YOUR COILPACK IF YOUR VEHICLE HAS ONE AND IF NOT CHECK THE ROTOR CAP FOR BURNT OR CORODED CONTACTS. BUT I WOULD REALLY LOOK AT REPLACEING THE BAD SENSOR AND TAKING A HARD LOOK AT THE THROTTLE POSITIONING SENSOR. BECAUSE IT TELLS THE COMPUTER HOW MUCH FUEL TO SEND TO THE CYLINDERS.

SINCERELY SNOWMAN
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Monday, April 9th, 2007 AT 9:25 PM

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