XXLMJ Posted October 13, 2009 Share Posted October 13, 2009 I thought i was having a security issue, but maybe it a CPS. I wanted to take the sensor off to check it and clean it, only to find out it was pretty loose. So i cleaned it and tighten it back up. The truck still starts for a few sec. then dies. Is there a way to test these sensors? Is this even a common symptom of a bad CPS? Link to comment Share on other sites More sharing options...
Geonovast Posted October 13, 2009 Share Posted October 13, 2009 It doesn't sound like a CPS issue. If the CPS was dead, it wouldn't start. You can check it, get a multimeter that can check ohms(resistance). Check the resistance between the two terminals on the plug. It should (IIRC) read between 125-275 ohms. That was the check I did on my Renix, I'm not sure if the numbers are the same for a HO or not. You mentioned it's got a 91 motor in an 88 or 89... was all the wiring switched over? Or is the Renix system running the HO motor? Link to comment Share on other sites More sharing options...
XXLMJ Posted October 14, 2009 Author Share Posted October 14, 2009 Since my CPS has 3 terminals on it, it must be the HO system. Do you guys know alot about these? I am pretty sure i have the alarm bypassed. Still getting good fuel pressure and spark but the truck will only run for a sec or so. And will keep running on starting fluid. I jumped the 2 wires going to the ballast resister. ANY IDEAS PLEASE Link to comment Share on other sites More sharing options...
Geonovast Posted October 14, 2009 Share Posted October 14, 2009 If your CPS was bad, you would not get spark. Link to comment Share on other sites More sharing options...
XXLMJ Posted October 14, 2009 Author Share Posted October 14, 2009 If your CPS was bad, you would not get spark. really? Ok so i can eliminate that. Thanks Do you know if jumping the 2 wires to the ballast resistor bypass it? Link to comment Share on other sites More sharing options...
Geonovast Posted October 14, 2009 Share Posted October 14, 2009 Jumping the two wires on the resistor is a way to test for a bad resistor. But if it does the same thing with the wires jumped, then your resistor is fine. Link to comment Share on other sites More sharing options...
XXLMJ Posted October 14, 2009 Author Share Posted October 14, 2009 WOW I'm out of ideas? I'm not sure what to check, test or bypass next. Link to comment Share on other sites More sharing options...
Eagle Posted October 14, 2009 Share Posted October 14, 2009 I thought i was having a security issue, but maybe it a CPS. I wanted to take the sensor off to check it and clean it, only to find out it was pretty loose. So i cleaned it and tighten it back up. The truck still starts for a few sec. then dies. Is there a way to test these sensors? Is this even a common symptom of a bad CPS? You also said it will keep running on starter fluid. That rules out the CPS, because with a bad CPS you have no spark. Your problem is the security system killed your fuel pump. Hotwire the fuel pump and I'll bet it'll run. Link to comment Share on other sites More sharing options...
XXLMJ Posted October 14, 2009 Author Share Posted October 14, 2009 Its getting too late to try it now, but that was going to be my next move. I did jump out the relay for the fuel pump under the hood, to run some gas out to change the fuel pump. And i tryed to start it like this but it acted the same. But i will try and run a wire directly to the fuel pump too see. Thanks for the help. Link to comment Share on other sites More sharing options...
Eagle Posted October 14, 2009 Share Posted October 14, 2009 An infernal (no, that's not a typo. Y'all know exactly what I mean) requires three things to run: Fuel, air, and spark. You have spark, since it'll run on starting fluid. You have air, since it'll run on starting fluid. One way or another, the problem has to be gas. Link to comment Share on other sites More sharing options...
XXLMJ Posted October 14, 2009 Author Share Posted October 14, 2009 An infernal Ya, i understand that. The truck starts you can hear the fuel pump run before start up, then it dies, like i shut the key off. Then once it dies you hear the fuel pump running still. I am unsure if it shuts off when the truck dies the starts pumping after the truck dies, but i do know i never loose fuel pressure. That is why i was questioning what a CPS does, thought it may control the injectors. Link to comment Share on other sites More sharing options...
shelbyluvv Posted October 14, 2009 Share Posted October 14, 2009 Try adjusting the ignition switch under the steering column. I had the same problem on a 94 XJ. I loosened the 2 bolts and slide it back a hair and it ran like a top. Link to comment Share on other sites More sharing options...
XXLMJ Posted October 14, 2009 Author Share Posted October 14, 2009 Can you tell me what the ignition switch looks like, is it on the column it self? Link to comment Share on other sites More sharing options...
shelbyluvv Posted October 14, 2009 Share Posted October 14, 2009 Lay under the steering column and look up. You will see a white box attached to the column with 2 bolts holding it on. There will be a metal rod going into it. That is the ignition switch. Link to comment Share on other sites More sharing options...
XXLMJ Posted October 15, 2009 Author Share Posted October 15, 2009 Ok so i unplugged the ignition in order to get to the bolts to move it like you said. And i decided to try and start it with it unplugged, And guess what it starts and runs!!!! So it the switch bad or do i need to move it, or do i leave it unplugged. This is great either way its been 3 days since i've heard this thing run!! Link to comment Share on other sites More sharing options...
shelbyluvv Posted October 15, 2009 Share Posted October 15, 2009 You can adjust it. I would buy a new one soon though. That is a sure fire sign that they are on their way out. Just keep the new one in the glove box for when it goes and swap it out. Link to comment Share on other sites More sharing options...
XXLMJ Posted October 15, 2009 Author Share Posted October 15, 2009 Thanks for the help!! I owe you a beer for sure! posting.php?mode=reply&f=2&t=18950# Link to comment Share on other sites More sharing options...
shelbyluvv Posted October 15, 2009 Share Posted October 15, 2009 No worries. That is what this club is all about. I am glad I could help you out. Now go out and enjoy your truck. I have not driven mine in over a year! Soon though, very soon! Link to comment Share on other sites More sharing options...
XXLMJ Posted October 16, 2009 Author Share Posted October 16, 2009 Ya i seen those pics of yours it looks VERY cool!! Link to comment Share on other sites More sharing options...
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