chriskoc1 Posted February 16, 2005 Report Share Posted February 16, 2005 I was driving today when all of a sudden my car started accelerating by itself when I stepped on the gas pedal and maintained a high rpm when I had to shift it out of drive to neutral. I quickly pumped the gas pedal and it went down again. It would start accelerating right after that when I put it back into drive and I stepped on the gas pedal. I received codes PO098 and PO091. One is for shifting out of neutral to drive with a high rpm. The other is for a transmission switch or a PRNDL switch. Any insight would be useful... Link to comment Share on other sites More sharing options...
jhall Posted February 16, 2005 Report Share Posted February 16, 2005 chriskoc1, For a start, check the throttle body and clean it as needed with some carb cleaner and a soft brush. Other problems may be causing the fast idle, but start here. Good luck. Link to comment Share on other sites More sharing options...
chriskoc1 Posted February 16, 2005 Author Report Share Posted February 16, 2005 I just got code PO030 but I can not determine what this code means from my mediocre haynes manual. If anyone knows what this means, please give any help. Link to comment Share on other sites More sharing options...
JimD Posted February 16, 2005 Report Share Posted February 16, 2005 I just got code PO030 but I can not determine what this code means from my mediocre haynes manual. If anyone knows what this means, please give any help. P0030 - Heated Oxygen Sensor (H02S) Heater Control Circuit Bank 1 Sensor 1 Helm is having a fire sale on 1995 and prior Service Manuals. http://www.helminc.com/helm/search_service...Q9EF7KKQ03N2C25 Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
Scotty Posted February 16, 2005 Report Share Posted February 16, 2005 Man I love this site, its so focused at times Link to comment Share on other sites More sharing options...
carltonmat Posted February 17, 2005 Report Share Posted February 17, 2005 it sounds like you are haveing a IAC motor problem. this seems to be a very common problem with caddies. i am on my thierd on a 91. same problem real hard on breaks Link to comment Share on other sites More sharing options...
PAUL T Posted February 17, 2005 Report Share Posted February 17, 2005 it sounds like you are haveing a IAC motor problem. this seems to be a very common problem with caddies. i am on my thierd on a 91. same problem real hard on breaks Shouldn't that be ISC (Idle Speed Control) motor? Link to comment Share on other sites More sharing options...
GOOB Posted February 17, 2005 Report Share Posted February 17, 2005 had the same problem a little while ago...try the TPS and the ISC Link to comment Share on other sites More sharing options...
chriskoc1 Posted February 17, 2005 Author Report Share Posted February 17, 2005 P0030 - Heated Oxygen Sensor (H02S) Heater Control Circuit Bank 1 Sensor 1 Okay, I ckecked the ISC motor and I believe it is shot since when I turn off the car it gave a very loud whirring noise. I also need to clean the throttle body good. When I checked the throttle body after turning off the car, small amounts of "smoke" came out of it after opening it up. Also, does anyone know what the Heated O2 Sensor code means? Thanks Link to comment Share on other sites More sharing options...
chriskoc1 Posted February 17, 2005 Author Report Share Posted February 17, 2005 I found the AC Delco part on Gmpartsdirect.com for $70.39. Anyone find it cheaper for the Ac Delco part. Link to comment Share on other sites More sharing options...
chriskoc1 Posted March 3, 2005 Author Report Share Posted March 3, 2005 Finally got the isc motor today and installed it. She's back to her old self again. Next project is to track some minor leaks in the hoses and clean out the EGR. Link to comment Share on other sites More sharing options...
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