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Irregular idle '89 Pioneer
I have an '89 4.0 Cherokee Pioneer. I have been having an idle problem for
some time. Sometimes, first thing in the morning, or after work on my way home, when I start it, it will idle way up at 2500 rpm for a while until I shut it down and try again. Sometimes (usually in the summer) parked in the hot sun but a cold engine, it will start fine, but when I go the idle will be so low it will stall, this is very annoying, it will be stalling one minute and the next minute it I am idling about 1800 rpm, coming to a stop sign I have to really press hard on the brake (or throw it in neutral) and sit there like a moron with my engine revved up. I have taken it twice to my works mechanics (commercial) over the past years and they did something to it that worked fine for a year then the problem came back. I have a new vacuum hose harness. (but some hoses are old) Richard |
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#2
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Our 88 does that every couple years and every couple years I open the
electrical plug on the TPS (throttle position sensor) on the throttle body and clean the contacts inside. That does the trick for us. I use a real spray contact cleaner usually, but WD40 will do in a pinch. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Richard wrote: > > I have an '89 4.0 Cherokee Pioneer. I have been having an idle problem for > some time. Sometimes, first thing in the morning, or after work on my way > home, when I start it, it will idle way up at 2500 rpm for a while until I > shut it down and try again. Sometimes (usually in the summer) parked in the > hot sun but a cold engine, it will start fine, but when I go the idle will > be so low it will stall, this is very annoying, it will be stalling one > minute and the next minute it I am idling about 1800 rpm, coming to a stop > sign I have to really press hard on the brake (or throw it in neutral) and > sit there like a moron with my engine revved up. > > I have taken it twice to my works mechanics (commercial) over the past years > and they did something to it that worked fine for a year then the problem > came back. I have a new vacuum hose harness. (but some hoses are old) > > Richard |
#3
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That must have been it because I merely unclipped it and blew off some dust
and it runs like a champ! I bought some cleaner, I will do it right tomorrow. Thanks! "Mike Romain" > wrote in message ... > Our 88 does that every couple years and every couple years I open the > electrical plug on the TPS (throttle position sensor) on the throttle > body and clean the contacts inside. That does the trick for us. I use > a real spray contact cleaner usually, but WD40 will do in a pinch. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > > Richard wrote: > > > > I have an '89 4.0 Cherokee Pioneer. I have been having an idle problem for > > some time. Sometimes, first thing in the morning, or after work on my way > > home, when I start it, it will idle way up at 2500 rpm for a while until I > > shut it down and try again. Sometimes (usually in the summer) parked in the > > hot sun but a cold engine, it will start fine, but when I go the idle will > > be so low it will stall, this is very annoying, it will be stalling one > > minute and the next minute it I am idling about 1800 rpm, coming to a stop > > sign I have to really press hard on the brake (or throw it in neutral) and > > sit there like a moron with my engine revved up. > > > > I have taken it twice to my works mechanics (commercial) over the past years > > and they did something to it that worked fine for a year then the problem > > came back. I have a new vacuum hose harness. (but some hoses are old) > > > > Richard |
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