EUREKA Posted February 13 Share Posted February 13 Went to go to work and when I started my truck it was idling at 2100 rpm. I drive it every day and had no issues when I parked it yesterday. No problem with the pedal or cable. I Guess I need to check for IAC issues. I had previously noticed that my electric fan starts running almost immediately when I start the truck, probably not related. Link to comment Share on other sites More sharing options...
EUREKA Posted February 13 Author Share Posted February 13 Upon trying it again it is now idling normally. Maybe intermittent IAC. I know the TB and IAC are clean and the IAC is not ore than 5 years old Link to comment Share on other sites More sharing options...
Ωhm Posted February 13 Share Posted February 13 1 hour ago, EUREKA said: I had previously noticed that my electric fan starts running almost immediately when I start the truck, probably not related. If you're talking about the 88 and if equipped, could you tell if the AC Clutch engaged with the fan ON? ECU will kick idle up if it sees AC SELECT/AC REQUEST signals. Link to comment Share on other sites More sharing options...
Big_Mark Posted February 13 Share Posted February 13 Hi Idle can also be caused by a vacuum leak, which I did to myself one time Link to comment Share on other sites More sharing options...
EUREKA Posted February 14 Author Share Posted February 14 4 hours ago, Ωhm said: If you're talking about the 88 and if equipped, could you tell if the AC Clutch engaged with the fan ON? ECU will kick idle up if it sees AC SELECT/AC REQUEST signals. I'll have to check to see if the AC clutch is engaged next time I start it cold. Link to comment Share on other sites More sharing options...
EUREKA Posted February 14 Author Share Posted February 14 3 hours ago, Big_Mark said: Hi Idle can also be caused by a vacuum leak, which I did to myself one time Yes I suppose I could have an intermittent vacuum leak. Link to comment Share on other sites More sharing options...
Ωhm Posted February 14 Share Posted February 14 4 minutes ago, EUREKA said: I'll have to check to see if the AC clutch is engaged next time I start it cold. If/when it happens again set AC Mode Select Switch to VENT or HEAT. See if the problem goes away. Quick check. Link to comment Share on other sites More sharing options...
EUREKA Posted February 14 Author Share Posted February 14 22 hours ago, Ωhm said: If/when it happens again set AC Mode Select Switch to VENT or HEAT. See if the problem goes away. Quick check. Will do. Thanks Link to comment Share on other sites More sharing options...
EUREKA Posted March 19 Author Share Posted March 19 Well it happened again. Started the truck cold and it started instantly as it normally does and idled at 2000 rpms. The AC mode switch was set to vent but last month it stopped working anyway and is permanently on defrost. When I shifted into any gear the rpm's dropped to just over 1000, shifting back to park or neutral it returned to 2000 rpm. Turned the engine off and restarted, the same condition occurred. Turned the engine of again and let it sit for a few minutes. Then upon staring it is now idling normally. Maybe the IAC is sticking? Too intermittent for a vacuum leak I think. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted March 19 Share Posted March 19 Did it slow down once warmed up? Link to comment Share on other sites More sharing options...
Htchevyii Posted March 19 Share Posted March 19 It seems like my 88 has randomly done that occasionally for as long as I can remember. On the last trip, it was idling at about 2500+ RPM when I started it. My Nick in Time Design REM showed the throttle position to be 33%, (normal idle is 17%). I popped the hood to check that the throttle wasn't stuck and it was fully closed. I shut it down and started it a few times and it went back to 17%. I'm guessing that I'm blaming my 2 year old Standard IGN TPS is to blame, but it has occasionally done the same thing even before the current TPS was installed, so who knows. I have also done all of Cruiser 54's fixes. If you don't have an REM on a Renix, I highly recommend getting one! Link to comment Share on other sites More sharing options...
EUREKA Posted March 19 Author Share Posted March 19 4 hours ago, ghetdjc320 said: Did it slow down once warmed up? It slowed down without warming up. The third time I started it, the idle speed was normal and it was still dead cold. Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted March 20 Share Posted March 20 I have had this issue before on my 87. Since I changed the IAC I haven't had it happen again. Link to comment Share on other sites More sharing options...
EUREKA Posted March 20 Author Share Posted March 20 My IAC is a few years old. I think the brand is BWD. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 21 Share Posted March 21 Link to comment Share on other sites More sharing options...
EUREKA Posted March 22 Author Share Posted March 22 1988 Jeep Comanche 4.0/AW4 Link to comment Share on other sites More sharing options...
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