64 Cheyenne Posted May 15, 2013 Share Posted May 15, 2013 :agree: Link to comment Share on other sites More sharing options...
Geonovast Posted May 15, 2013 Share Posted May 15, 2013 I seriously doubt any MJ does that. Certainly not the Renix, the computer never even knows if the vehicle is even moving. Certainly possible that the momentum of the truck with no throttle uses less gas than idling. Link to comment Share on other sites More sharing options...
64 Cheyenne Posted May 15, 2013 Share Posted May 15, 2013 I seriously doubt any MJ does that. Certainly not the Renix, the computer never even knows if the vehicle is even moving. Certainly possible that the momentum of the truck with no throttle uses less gas than idling. So your sayin that that if your going down hill at 2000 rpm, you take your foot off of the gas, the throttle butterfly closes and your still flowing fuel? Carburetor yes injectors no, thats why there is a TPS or it would keep feedin fuel. Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 15, 2013 Share Posted May 15, 2013 I seriously doubt any MJ does that. Certainly not the Renix, the computer never even knows if the vehicle is even moving. Certainly possible that the momentum of the truck with no throttle uses less gas than idling. Are you saying the Renix system does not have a speed sensor input to the computer? Link to comment Share on other sites More sharing options...
Geonovast Posted May 17, 2013 Share Posted May 17, 2013 I seriously doubt any MJ does that. Certainly not the Renix, the computer never even knows if the vehicle is even moving. Certainly possible that the momentum of the truck with no throttle uses less gas than idling. Are you saying the Renix system does not have a speed sensor input to the computer? Does it? I've never seen or heard of one. Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 17, 2013 Share Posted May 17, 2013 Looks like the 89's w. the AW4 were the first Renix models to get a speed sensor (VSS). It's only used to control the tranny shifting points on the Renix system. On the HOs it also provides an input to the ECU. Link to comment Share on other sites More sharing options...
velco Posted May 17, 2013 Share Posted May 17, 2013 What triggers the useless upshift indicator on the renix as it seems to be related to engine RPM? Link to comment Share on other sites More sharing options...
cruiser54 Posted May 18, 2013 Share Posted May 18, 2013 They have the ability to shut the fuel off on decel. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted May 27, 2013 Author Share Posted May 27, 2013 Is the IAC the left or right plug on the TB? Also my exhaust kinda sounds like its not breathing properly, could this be making the engine die when in neutral? Link to comment Share on other sites More sharing options...
AeroNautical Posted May 27, 2013 Share Posted May 27, 2013 From the front the IAC is on the left. Not sure about the exhaust problem. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted May 27, 2013 Author Share Posted May 27, 2013 Getting cleaned hopefully tomorrow then. Let you guys kmow how it turns out when i test Link to comment Share on other sites More sharing options...
Knucklehead97 Posted May 29, 2013 Author Share Posted May 29, 2013 Well i got the IAC cleaned up good. Crabked the trucj, did fine. Till about 30 seconds in idle when it went down to about 200 rpm and nearly died (it does this almost every thirty seconds now. It runs good, then rough, then good again.) Without even moving! I'm thinking i might have used to much throttle body cleaner, so I'm about to take it off again and clean it dry. Otherwise, what could this be? Bad iac? Something worse? Link to comment Share on other sites More sharing options...
Knucklehead97 Posted May 29, 2013 Author Share Posted May 29, 2013 I just cleaned it up and tried it, no difference. It stops nearly dying out after 4 or 5 times of almost doing it. I havent testee the downhill wresults yet, but i doubt they'll be good. I'm stumped on this though Link to comment Share on other sites More sharing options...
Knucklehead97 Posted June 27, 2013 Author Share Posted June 27, 2013 Ive cleaned the IAC three times with no resilts. And refreshed my grounds, which at first I thought work, but it didn't. Now it stutters at idle and dies out whenever I go to turn and press the clutch in. Should I buy a new IAC? Is there anyway to be sure that it is the IAC before I buy it? I really need this figured out. Thanks Link to comment Share on other sites More sharing options...
64 Cheyenne Posted June 27, 2013 Share Posted June 27, 2013 Did you clean the throttle butterfly? adjust the throttle position sensor with a multimeter? Link to comment Share on other sites More sharing options...
Oddmodman Posted June 27, 2013 Share Posted June 27, 2013 Exhaust a clogged cat? Link to comment Share on other sites More sharing options...
Knucklehead97 Posted June 27, 2013 Author Share Posted June 27, 2013 Could someone please explain the tps adjustment? Ive checked it and all with my multimeter (5.045 V A and B prong. .3V B and C prong. Yes I know its nowhere near 17%) but I cannot figure out how to adjust it. And I've been meaning to straightpipe my exhaust, anyway to check if theres a clog? And also, when I rev my engine to 2-3000 rpms just sitting. It dies out when I let off. So IAC not acting fast enough? Link to comment Share on other sites More sharing options...
AeroNautical Posted June 28, 2013 Share Posted June 28, 2013 To adjust the TPS, look for the two torx screws above and below the connector. Loosen both of them, but not so much that the TPS flops around. Twist it clockwise or counterclockwise with your voltmeter on to get the desired reading, than very carefully tighten the screws. By carefully, I mean that even the smallest movement will throw it off. I wouldn't blame anything on the IAC just yet, not until you have the TPS properly adjusted. I can imagine after being revved the engine might quit if the fuel delivery is a bit off. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted June 28, 2013 Author Share Posted June 28, 2013 But how do I read the volts with it plugged in? If I unplug the plug, then won't twisting it not do anything to the volts till its plugged in? Sorry if I sound like an idiot, but its confused me Link to comment Share on other sites More sharing options...
AeroNautical Posted June 28, 2013 Share Posted June 28, 2013 Ah, I see where you may be confused. While the connector is plugged into the TPS, you have to back probe the wires. You can do this by getting 3 thin pieces of metal (I used paper clips) and push them up the back of the connector, making sure they are touching metal. This explains it pretty well: http://comancheclub.com/topic/38612-very-high-idle/?p=388717 Link to comment Share on other sites More sharing options...
Knucklehead97 Posted June 28, 2013 Author Share Posted June 28, 2013 I understand it now. Thanks! I'm thinking some of it might be vaccuum lines too. By the way, I love the color of your truck! Its a great camo job Link to comment Share on other sites More sharing options...
AeroNautical Posted June 28, 2013 Share Posted June 28, 2013 No problem, hope it works out for ya. And thanks, I appreciate that. The fender flares and cab vents are all black now, it just now crossed my mind to update my picture, haha. Link to comment Share on other sites More sharing options...
Oddmodman Posted June 28, 2013 Share Posted June 28, 2013 When I get my MJ to the point where it needs the finishing touches of paint, I want to do it in the red/snow camo style. White, black, grey, and red. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted June 28, 2013 Author Share Posted June 28, 2013 I'm doing dark OD green with black around the the trim. But back on topic. I adjusted the tps to .83 (calculated and that is correct for mine) and it idles a little better. But still dies out when going to high rpms to nothing... so what else should I be doing? But now I can't even get the truck to start again cause of problems getting power to the starter >.< I'm thinking battery cables. But on the dying out, what should I do? Link to comment Share on other sites More sharing options...
Oddmodman Posted June 28, 2013 Share Posted June 28, 2013 Is this your only vehicle? Did you check the CPS? Clean it? Ummm, bad battery or alternator...? Link to comment Share on other sites More sharing options...
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