sonjaab Posted May 12, 2023 Report Share Posted May 12, 2023 (edited) My 93 Deville 4.9 has been stalling out while driving. Engine warm and will die when slowing down or pulling up to a stop sign. Will Imm. restart tho. It does it with a/c on or off. Engine runs smoothly. NO codes either Idle air control or failing ICM? Ideas? Edited May 12, 2023 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
rockfangd Posted May 13, 2023 Report Share Posted May 13, 2023 Did this start after the blower replacement? Almost sounds like a pickup issue. Losing pickup signal causing engine to stall. Could be ICM related, typically fail either where the pickup plugs into it or by heat. Most of the time I find they either will not restart until cool, or not at all. Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted May 13, 2023 Author Report Share Posted May 13, 2023 YES............. Started after blower install. I checked all connectors and such. Maybe the idle air control? Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
Logan Posted May 13, 2023 Report Share Posted May 13, 2023 There is a 4.9L idle learn procedure that is suppose to be done after a battery disconnect and other repairs. I would look in the service manual for the specific procedure as different vehicle IPCs and computers etc were used based on the exact vehicle year and platform. Most folks don't do it....or the car seems to work fine not doing it. But sometimes it does fix the stall problem. This is posted on this site.....but I think it's the E/K 4.9 procedure. http://www.caddyinfo.com/idlelearn.htm Quote Logan Diagnostic LLC www.airbagcrash.com www.logandieselusa.com www.ledfix.com www.ledfix.com/yukontaillightrepair.html www.ledfix.com/ledreplacements.html www.ledfix.com/j42385toolrental.html Link to comment Share on other sites More sharing options...
rockfangd Posted May 14, 2023 Report Share Posted May 14, 2023 I completely agree. There are other GMs that have the same issue, mostly resolved by 96. I do not remember this ones procedure but I do believe it was unique to this engine. Should be easy to find though Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted May 14, 2023 Author Report Share Posted May 14, 2023 (edited) Hmmmm I do note a code 52 when doing the diagnosis also. Well the old battery did go dead and I had a new one installed after blower replacement. Then the stall started. Checked a wiring, hoses etc. and they seem secure and in place. So I will give the reprogram procedure a shot. I DO HAVE A cADDY service manual also. Edited May 14, 2023 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted May 17, 2023 Author Report Share Posted May 17, 2023 LOGAN............Is that idle set procedure in the GM factory service manual? I cant find it.........................duh ! Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
rockfangd Posted May 18, 2023 Report Share Posted May 18, 2023 Check this out. I hope it helps Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted May 19, 2023 Author Report Share Posted May 19, 2023 Gonna give it a shot today ! Thanks Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted May 22, 2023 Author Report Share Posted May 22, 2023 Well guys............ Using the procedures from Logan and Rock havent worked. Gonna try Rocks link again. I think i didnt do something correctly. No new codes tho................. HMMMM........... Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
rockfangd Posted May 23, 2023 Report Share Posted May 23, 2023 I know the procedure can be a pain in the butt. Been there before. I have fought issues with IAC motors and they make me want to pull my hair out when they do not cooperate. What is it currently doing? Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted May 24, 2023 Author Report Share Posted May 24, 2023 (edited) Driving along ........ release acc. to reduce speed. Engine stalls SO WHILE COASTING, slap into N and turn key. Starts rite up and have to press on acc. pedal to keep running at times. Starts fine cold no noises.......... Bet it is that idle learn procedure........... Prob didnt do it rite. will try again......... Gotta hold off today... Impala rear brakes grinding at 103k Gotta order from rockauto and get another magnet! Edited May 24, 2023 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted May 31, 2023 Author Report Share Posted May 31, 2023 (edited) Well guys It looks like sucess! After trying both Logans and Rocks posts and links and not finding the procedure in the GM manual I figured I would start fresh. I disconnected the battery then did the procedure Rock posted. IT WORKED! Runs and idles fine................ Thanks again Logan and Rock! Edited May 31, 2023 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
rockfangd Posted June 1, 2023 Report Share Posted June 1, 2023 Excellent. Glad to hear. This can also happen if the ISC gets unplugged or if you clean the throttle body. Just fyi Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted June 1, 2023 Author Report Share Posted June 1, 2023 Well I posted success too soon! The stalling is back! Will try the reset procedure again! Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted June 27, 2023 Author Report Share Posted June 27, 2023 HEY ALL........ Havent repost on my stalling problem. Been busy with buying a new toy! Bought a 84 Corvette for summer fun! Got a one owner garage queen from a guy locally. 62k miles Paint is real nice n shiny, runs well, typical drivers seat rips, warm a/c, needs tires. Paid $4500 for it. Will get to the Caddy issue shortly! Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted August 24, 2023 Author Report Share Posted August 24, 2023 Well success ! Tried the reset procedure again and it worked! Now running fine. Thanks All! Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
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