caddyfan13 Posted March 7, 2006 Report Share Posted March 7, 2006 I have a 1994 Deville. 4.9L. The check engine soon light came on. I can feel the car surging especially when I am comming to a stop. After I turn the car off and restart it seems to correct itself until the next day. My codes are: P030 P039 P055 P098 No IPC No ACP No SIR PCM? Please help? Link to comment Share on other sites More sharing options...
Ranger Posted March 8, 2006 Report Share Posted March 8, 2006 P030 (E030) ................................................... ISC RPM out of range P039 (E039) ..... Torque Coverter Clutch/Viscous Converter Clutch Engagement Problem P055 (E055) ............................... Closed Throttle Angle Out of Range [TPS] P098 (E098) .................................... High RPM P/N to D/R Shift Under ISC PCM? is asking if you want to enter the PCM mode. Most seem to be ISC (Idle Speed Control) motor related. Probably due for replacement. I assume all codes where current as opposed to history? For future reference, you can get the code definitions here. http://myweb.accessus.net/~090/dtcobd1.html Link to comment Share on other sites More sharing options...
caddyfan13 Posted March 8, 2006 Author Report Share Posted March 8, 2006 I adjusted the idle screw on the ISC motor so that the throttle lever is not touching the screw. Every time I rev the eng. the screw turns out a little bit. It seems to me that the idle will increase after a few days again. Do I need to replace the ISC motor or do you think clearing the codes will stop this issue. P030 (E030) ................................................... ISC RPM out of range P039 (E039) ..... Torque Coverter Clutch/Viscous Converter Clutch Engagement Problem P055 (E055) ............................... Closed Throttle Angle Out of Range [TPS] P098 (E098) .................................... High RPM P/N to D/R Shift Under ISC PCM? is asking if you want to enter the PCM mode. Most seem to be ISC (Idle Speed Control) motor related. Probably due for replacement. I assume all codes where current as opposed to history? For future reference, you can get the code definitions here. http://myweb.accessus.net/~090/dtcobd1.html Link to comment Share on other sites More sharing options...
Ranger Posted March 9, 2006 Report Share Posted March 9, 2006 Did you use the proper proceedure to adjust the ISC? Link to comment Share on other sites More sharing options...
adallak Posted March 9, 2006 Report Share Posted March 9, 2006 Is your Throttle Body (TB) clean? Carbon deposits in bores and on backsides of plates can cause idle speed related codes in your list. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
KHE Posted March 9, 2006 Report Share Posted March 9, 2006 I adjusted the idle screw on the ISC motor so that the throttle lever is not touching the screw. Every time I rev the eng. the screw turns out a little bit. It seems to me that the idle will increase after a few days again. Do I need to replace the ISC motor or do you think clearing the codes will stop this issue. P030 (E030) ................................................... ISC RPM out of range P039 (E039) ..... Torque Coverter Clutch/Viscous Converter Clutch Engagement Problem P055 (E055) ............................... Closed Throttle Angle Out of Range [TPS] P098 (E098) .................................... High RPM P/N to D/R Shift Under ISC PCM? is asking if you want to enter the PCM mode. Most seem to be ISC (Idle Speed Control) motor related. Probably due for replacement. I assume all codes where current as opposed to history? For future reference, you can get the code definitions here. http://myweb.accessus.net/~090/dtcobd1.html If the screw is not maintaining it's position, the ISC adjustment will change (and will NEVER be right) causing driveability issues. See if you can remove the screw and apply some blue lock-tite on the screw. Adjust the ISC and let the loc-tite cure for 24 hours. You might also use some of the wicking grade loctite that can be added to the adjustment screw after you perform the adjustment - it will work its way into the threads. At any rate, let it cure for 24 hours before starting the engine. If that doesn't work, you will probably need to replace the ISC motor. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.