Rough Idle problem 1992 Dodge Ram 50 (Mitsubishi Mighty Max) 2.4L 4Cyl

From : oconnor

Q: problem goes like this - rough idle may stall in wet weather exhaust smells rich worse when in gear auto trans - not noticable when driving doesnt misfire at speed or under load - when maf sensor disconnected idle smooths out and exhaust leans out doesnt smell rich - no codes in stored computer - idle speed control motor called motor position sensor assy in mitsu speakcan be seen adjusting idle when warm causing a surge condition in idle speed up/down 300-400 rpm heres what ive tried - cleaned maf sensor with fuel injector cleaner - tried 2 x mps assys - tried 3 x maf sensors - tried 2 x ecu computers - checked values of following sensors iaw specs in haynes service manual - throttle position sensor - maf air intake temp sensor - idle position switch - o2 sensor - motor position sensor function and resistance tests it has also spent a day at the dealer with no results and no bill luckily and 3 days at a local expert with a $165 bill a used maf sensor and a cut maf power wire to solve the problem since refunded by garage with apologies for poor work by expert looking for any input on what to try next or where to go to get accurate diagnostic info wiring diagrams troubleshooting flow charts etc free or at cost i dont care. thanks in advance .

Replies:

From : mark sparge

*** post for free via your reader at post.feed.com *** oconnor wrote problem goes like this - rough idle may stall in wet weather exhaust smells rich worse when in gear auto trans - not noticable when driving doesnt misfire at speed or under load - when maf sensor disconnected idle smooths out and exhaust leans out doesnt smell rich - no codes in stored computer - idle speed control motor called motor position sensor assy in mitsu speakcan be seen adjusting idle when warm causing a surge condition in idle speed up/down 300-400 rpm heres what ive tried - cleaned maf sensor with fuel injector cleaner - tried 2 x mps assys - tried 3 x maf sensors - tried 2 x ecu computers - checked values of following sensors iaw specs in haynes service manual - throttle position sensor - maf air intake temp sensor - idle position switch - o2 sensor - motor position sensor function and resistance tests it has also spent a day at the dealer with no results and no bill luckily and 3 days at a local expert with a $165 bill a used maf sensor and a cut maf power wire to solve the problem since refunded by garage with apologies for poor work by expert looking for any input on what to try next or where to go to get accurate diagnostic info wiring diagrams troubleshooting flow charts etc free or at cost i dont care. thanks in advance i re-read your post several times and i see no indication that youve changed plug wires/distributor cap/rotor/plugs etc. if i misunderstand - sorry. if you hear hoofbeats dont look for zebras! mark sparge -----= posted via feed.com uncensored usenet =----- http//www.feed.com - the #1 group service in the world! -----== 100000 groups! - 19 servers! - unlimited download! =----- .

From : fmb

problem goes like this - rough idle may stall in wet weather exhaust smells rich worse when in gear auto trans - not noticable when driving doesnt misfire at speed or under load - when maf sensor disconnected idle smooths out and exhaust leans out doesnt smell rich - no codes in stored computer - idle speed control motor called motor position sensor assy in mitsu speakcan be seen adjusting idle when warm causing a surge condition in idle speed up/down 300-400 rpm heres what ive tried - cleaned maf sensor with fuel injector cleaner - tried 2 x mps assys - tried 3 x maf sensors - tried 2 x ecu computers - checked values of following sensors iaw specs in haynes service manual - throttle position sensor - maf air intake temp sensor - idle position switch - o2 sensor - motor position sensor function and resistance tests it has also spent a day at the dealer with no results and no bill luckily and 3 days at a local expert with a $165 bill a used maf sensor and a cut maf power wire to solve the problem since refunded by garage with apologies for poor work by expert looking for any input on what to try next or where to go to get accurate diagnostic info wiring diagrams troubleshooting flow charts etc free or at cost i dont care. thanks in advance id check; http//dodgeram.info/tsb/1992/18-04-92.htm im surprised at your comment of no codes. if it never had a new o2 sensor id probably change that out. it wouldnt be the first time i tossed parts at a problem i couldnt otherwise solve. fmb only one b in fmb .

From : oconnor

id check; http//dodgeram.info/tsb/1992/18-04-92.htm im surprised at your comment of no codes. if it never had a new o2 sensor id probably change that out. it wouldnt be the first time i tossed parts at a problem i couldnt otherwise solve. fmb only one b in fmb more follow up. just rechecked o2 sensor. shows only 50-70 mv vice specd 600-1000mv. would this cause the idle issue any thoughts please help! .

From : orland

just another thought. i also had the problem with stalling in damp/foggy weather. no codes ever showed until one especially foggy day in maine code appeared. had to do with a crankshaft sensor. problem disappeared when we changed it... id check; http//dodgeram.info/tsb/1992/18-04-92.htm im surprised at your comment of no codes. if it never had a new o2 sensor id probably change that out. it wouldnt be the first time i tossed parts at a problem i couldnt otherwise solve. fmb only one b in fmb more follow up. just rechecked o2 sensor. shows only 50-70 mv vice specd 600-1000mv. would this cause the idle issue any thoughts please help! .