tm8272 Posted March 12, 2011 Report Share Posted March 12, 2011 Hello everyone, I drove my 1994 Cadillac Seville for first time in a week to Home and Garden show at fairgounds yesterday. When I started car to leave as I was driving out of parking lot the motor idle raced up to over 2 RPM as i was waiting on traffic and my turn to go. It shocked me and the security guards directing traffic out looked at me. I immediatley put car in park and turned off the engine. Had to have my foot on the brake to keep car from taking off fast. I restarted the car and it seemed ok until I made a pit stop and when I restarted it again the motor raced like I had my foot on the accelerator to 3 RPM! I turned off the engine again, thinking I might have a run away Toyota! Very scarey! I restarted car and was only 3 miles from home so I put it in reversed and it jerked because of engine speed. When I put car in neutral as i went to stop signs the engine reved even higher!! Neutral made it worse!! I got the car home safely but was thinking good thing it was dry and nice weather and not snow or ice!! I turned car off and it smelled hot. I pulled codes today and no current codes. I started car and same thing the engine went to 2 RPM without me touching the gas peddle. Made sure nothing touching gas paddle or causing it to stick. I did a snapshot of condition and turned car off. I went into OBD and no codes but pulled snapshot data and got: P013 which is Rear Heated Oxygen Sensor Not Ready. I read in manual that possible causes are: Throttle between 5.4 and 25 degrees or Throttle switch open. Does anyone think it could be the Throttle position sensor? If so can I pick it up and replace myself?? Thanks for any info! This engine has been replaced with a new Jasper Reman and only has about 600 miles on new engine. Not sure if this would be covered by the Jasper warranty or not. They are not in on weekends and I have other vehicles to drive so leaving this parked til issue is resolved. Thanks again for any thoughts! Hope everyone is having a good weekend. I have not searched posts on this issue yet on here but will do so next. Link to comment Share on other sites More sharing options...
Göran W Posted March 12, 2011 Report Share Posted March 12, 2011 DO NOT, I repeat, DO NOT drive until this is ok! You risk to blow the transmission AND the engine. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted March 12, 2011 Report Share Posted March 12, 2011 When you turn the key off, all the codes go to History. To see the codes that reflect what is happening, you have to check the codes while the engine is still running. Since that isn't an option, simply write down *all* the codes and post them here. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
caddypete Posted March 13, 2011 Report Share Posted March 13, 2011 Check your throttle cables to see if they are hanging up. Or the plate on the TB, the engine will only speed up with the throttle plate opening. The other way would be air getting in from a vacuum leak. Link to comment Share on other sites More sharing options...
rockfangd Posted March 13, 2011 Report Share Posted March 13, 2011 my oldsmobile cutlass 3100 did the same exact thing a few years ago, it ended up being the coolant temp sensor (ecm not cluster) went bad and it was showing temperature being -40*f and was making it run at higher idle. I didnt drive it far at all GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
CarlaValentine Posted March 13, 2011 Report Share Posted March 13, 2011 Being a 94 Northstar, your engine has an Idle Speed Control (ISC) motor. If the contacts in it become dirty or don't meet up right, it can cause a severe high idle. I had that problem a year ago. It's a fairly pricey part to replace, but can usually be fixed with a good cleaning. I would give it a shot. The cleaning procedure is pretty quick and painless. Link to comment Share on other sites More sharing options...
tm8272 Posted March 15, 2011 Author Report Share Posted March 15, 2011 Being a 94 Northstar, your engine has an Idle Speed Control (ISC) motor. If the contacts in it become dirty or don't meet up right, it can cause a severe high idle. I had that problem a year ago. It's a fairly pricey part to replace, but can usually be fixed with a good cleaning. I would give it a shot. The cleaning procedure is pretty quick and painless. Thanks for all the suggestions everyone! I did spray some WD 40 on cables and tried to clean as much as I could. That really helped a lot! The ide is now down to 1 RPM on tach when it is started. Still not as low as it should be. Is there any special cleaner I should buy for throttle plate and sensors?? I checked my codes again and still have NO codes showing up so that leads me to believe it is a cleaning issue. I have not found a vacuum leak yet. Carla you mentioned you had a similar issue, did you use any special cleaner to resolve your issue? Thanks again to everyone that commented! I did call Jasper engine to see if any of this was covered under warranty and they told me my old sensors were swaped by installer and that was my expense if it was sensors. If it was a vacuum leak then that would be covered by installer and warranty. I will continue the cleaner with a special cleaner if I can buy one to do a good job and then go from there. Link to comment Share on other sites More sharing options...
KHE Posted March 15, 2011 Report Share Posted March 15, 2011 It is not advisable to lube the throttle and/or cruise cables. Lube will attract dirt and cause binding. Check the Idle Speed Control motor - tons of information on that in the archives - do a search on ISC. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Ranger Posted March 16, 2011 Report Share Posted March 16, 2011 Is there any special cleaner I should buy for throttle plate and sensors?? Buy a can of TB cleaner from your local parts store. They say not to use carb cleaner, but I still have some Gumout carb cleaner left and have had no ill effects from using it. DO NOT use it on any sensors though. You shouldn't need to clean any sensors that I can think of, but if you do, use an electrical parts cleaner or Brakleen. Those leave no residue. Link to comment Share on other sites More sharing options...
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