SoloCamo Posted September 10, 2007 Share Posted September 10, 2007 Hey all! Yet another problem on this troublesome 88' manche. :mad: Anyways, as the title implies, it has a case of random high idles. For example, it could start up fine one minute, shut it down for an hour, turn it on, and then have a high idle while in park. Once you drop it in gear, it will go to a slightly lower idle. However, it will go like a bat out of hell with me NOT on the throttle at all. Not like it's gunning it, but it is definately moving much faster than it should be while i'm not on the gas due to the slightly high idle. The whole thing is, is that it's random. One day it will be great, one day it will idle like crap. Shut it down, restart it, and it will run fine, sometimes it won't. Maybe a sensor? Also, lately, it has been doing the whole, "I don't feel like starting today" thing. As in, sometimes it will start, sometimes it won't. Wait an hour, it will work. And in some cases lately, it took almost 12 seconds of straight cranking to start it, and it will hesitate when starting. Once it's running, it's running though. Never hesitates while driving. I just changed the spark plugs to stock Champions, from the previous owners Bosch Platinums, which I heard are crap for the 4.0. No large difference, if anything, slightly better idle and response. 88' Comanche SporTruck 4.0L renix, AW-4, 125k miles, 2wd Any help/opinions would be greatly appreciated! :cheers: Link to comment Share on other sites More sharing options...
86FUBAR Posted September 10, 2007 Share Posted September 10, 2007 Did u inspect the TPS and IAC ? Link to comment Share on other sites More sharing options...
SoloCamo Posted September 10, 2007 Author Share Posted September 10, 2007 Did u inspect the TPS and IAC ? No, I actually haven't. What exactly should I be looking for if it was bad? Or do you think they may just be dirty? Also, IIRC, they are both located near the air box, correct? Thanks for the reply! :cheers: Link to comment Share on other sites More sharing options...
oldjeep Posted September 10, 2007 Share Posted September 10, 2007 Did u inspect the TPS and IAC ? No, I actually haven't. What exactly should I be looking for if it was bad? Or do you think they may just be dirty? Also, IIRC, they are both located near the air box, correct? Thanks for the reply! :cheers: They are both mounted in the front of the throttle body. Link to comment Share on other sites More sharing options...
Pete M Posted September 10, 2007 Share Posted September 10, 2007 Link to comment Share on other sites More sharing options...
SoloCamo Posted September 12, 2007 Author Share Posted September 12, 2007 Thanks for all the help! :cheers: Is there anything I should be looking for in particular? I don't have any voltmeters or anything :hateputers: Since the change of the spark plugs, it's been running great and hasn't hesitated or failed to start at all. However, it did give me a real high idle once, while in any gear. Hasn't done in since. :nuts: Thanks again for all the help! I'm also going to try and clean out the Throttlebody a bit to see if that helps some flow. Link to comment Share on other sites More sharing options...
partsmj Posted September 12, 2007 Share Posted September 12, 2007 I found this link on naxja. http://www.naxja.org/forum/showthread.p ... +high+idle Kinda long. Hope it helps. Link to comment Share on other sites More sharing options...
SoloCamo Posted September 19, 2007 Author Share Posted September 19, 2007 Thanks again for the replies! Well I took apart and cleaned the IAC, and it had so much grunge and crap all over it. Got some TB cleaner and gave it a nice new shine, and also cleaned out the TB a bit too, mostly the butterfly. Anyways, it seems to have fixed the really bad high idle. But if that naxja thread is any indicator, I shouldn't keep my hopes up to high. These renix's seem to have too many electrical gremlins. I get a slightly high idle on cold starts now, but it will drop down and remain fine after a minute or so. Thanks again! Link to comment Share on other sites More sharing options...
skimore11 Posted September 19, 2007 Share Posted September 19, 2007 I don't know much but I had random high and real low idle problems. I was trying to get the blowby under control and used some high temp RTV to seal around the forward line in the valve cover that goes to the air box. Well since doing that I have had a much more consistent idle. Maybe coincidence? Link to comment Share on other sites More sharing options...
fiatslug87 Posted September 20, 2007 Share Posted September 20, 2007 Vacuum leaks will cause problems with idling. Start the engine and spray TB cleaner (some people use water) around the intake manifold and any other gasket (e.g. TB) or vacuum line connection. If the idle drops you’ve found yourself a leak. On one of mine the intake manifold was the problem around the #5 & #6 cylinders. I just re-torqued the nuts and it’s been fine ever since. Link to comment Share on other sites More sharing options...
oldjeep Posted September 20, 2007 Share Posted September 20, 2007 Vacuum leaks will cause problems with idling. Start the engine and spray TB cleaner (some people use water) around the intake manifold and any other gasket (e.g. TB) or vacuum line connection. If the idle drops you’ve found yourself a leak. On one of mine the intake manifold was the problem around the #5 & #6 cylinders. I just re-torqued the nuts and it’s been fine ever since. Normally you use an unlit propane torch to locate vac leaks and listen for the increase in idle. Link to comment Share on other sites More sharing options...
87manche Posted September 20, 2007 Share Posted September 20, 2007 give all the throttle linkage a squirt with some lube, that's all my high idle problem was. Link to comment Share on other sites More sharing options...
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