AMC-MJ Posted February 21, 2010 Share Posted February 21, 2010 Swapped out the coil with a nice new unit ! Ran great for a while but it stumbled yet shockingly recovered on the way home today ! What to replace next ? Ignition Module ? Or Fuel injector ? Both look old . . . Mike Link to comment Share on other sites More sharing options...
freakjeep93 Posted February 21, 2010 Share Posted February 21, 2010 a few guys so far have said to try the injector so id try that. Link to comment Share on other sites More sharing options...
1987Comanche Posted February 22, 2010 Share Posted February 22, 2010 You'll find the 2.5 fuel injector to be crazy expensive new. I have a spare 2.5 TBI unit that I kept for parts when I had my '87. If you want anything from it send me a PM. Link to comment Share on other sites More sharing options...
dasbulliwagen Posted February 22, 2010 Share Posted February 22, 2010 I had a problem like this when I first got my truck, I put a ton of injector cleaner through it, put new cap, rotor, plugs and wires on it.... nothing helped.... till I put in a new O2 sensor, and BAM its ran great ever since. Just another thing to try. Good luck! Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 22, 2010 Author Share Posted February 22, 2010 You guys sure love adding parts to the list . . . LOL oh well I'm happy with it ill keep fixing till its fixed LOL I'm not giving up ! Mike Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 22, 2010 Author Share Posted February 22, 2010 Question ? how tight is the coil pack supposed to be in the Ignition module ? Cause my coil had no resistance it simply just dropped in . . . the module looks corroded the whole casing of it looks rough . . . Mike Link to comment Share on other sites More sharing options...
kro10000 Posted February 22, 2010 Share Posted February 22, 2010 I don't know about that specific module, but at oreillys we can test ignition modules, so you might check that out before shotgunning it Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 22, 2010 Author Share Posted February 22, 2010 I don't know about that specific module, but at oreillys we can test ignition modules, so you might check that out before shotgunning it 85-95% of the time truck run's perfectly, its an intermittent malfunction if it was the Module failing intermittently would the test show anything ? Mike Link to comment Share on other sites More sharing options...
jteckmann Posted February 22, 2010 Share Posted February 22, 2010 Question ? how tight is the coil pack supposed to be in the Ignition module ? Cause my coil had no resistance it simply just dropped in . . . the module looks corroded the whole casing of it looks rough . . . Mike It should clamp in fairly tight. Enough resistance to have to push on it a bit and hear the audible click of the prongs before you tighten it down with the screws. The area around the ICU and between the coil is horrible for trapping dirt/debris, and there can be a lot of corrosion if it hasn't ever been taken apart and cleaned. I'd clean it up really well, and see if you can bend the prongs back so it clamps tight. May just be a bad connection that's causing the intermittent problem. Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 22, 2010 Author Share Posted February 22, 2010 I will give that a try, because it didn't have to push it simply dropped right on . . . Mike Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 22, 2010 Author Share Posted February 22, 2010 What suck's is i thought i had this thing fixed so i went and ordered up two brand new 235/75R15C Crowler MT's for my truck :fs1: . . . Mike Link to comment Share on other sites More sharing options...
kro10000 Posted February 23, 2010 Share Posted February 23, 2010 The test may or may not show an intermittant problem, however its worth a shot, if it tests bad then youve saved youself cash and a headache, if it tests good, it is possible it is still bad Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 23, 2010 Author Share Posted February 23, 2010 Ya I guess so, But i drive it every day i have no choice but to keep driving it . . . So I was wondering if it would show anything being intermittent . . . I can't wait to get my tires and it would be awesome to have it running good when i get my tires ! Mike Link to comment Share on other sites More sharing options...
kro10000 Posted February 23, 2010 Share Posted February 23, 2010 Yeah I understand, but if it tests bad then its definitely bad, so you know it needs to be replaced. It will just narrow your diagnosing a little bit further Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 23, 2010 Author Share Posted February 23, 2010 For the giggles of it i pulled the air tube off and watched my injector spray fuel . . . at idle it was a nice heavy mist, at wide open throttle the engine bucked and stumbled only hitting 3,600rpm and the mist thinned way out to almost like a vapor thin . . . Injector related ? or Fuel pressure related ? the idle spray looked good as it reved up the spray thinned out . . . Module tho ugly tested fine . . . Mike Link to comment Share on other sites More sharing options...
jteckmann Posted February 23, 2010 Share Posted February 23, 2010 I'd check both. There's a test port on the driver's fender side of the throttle body. Fuel pressure should be 15psi. The Chilton's manual lists 12-15 as an acceptable range, but I was told anything less than 15psi or fluctuations at different rpms is a big sign the pump is going bad. See if your local shop checks injectors. I pulled the injector from mine, and the machine shop put it on their bench, took about 5mins, and was free. Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 23, 2010 Author Share Posted February 23, 2010 Possible fuel pump ? . . . Now that would truely suck, there aint but maybe 1,500 miles on the fuel pump and maybe 500miles on the fuel filter ! Sounds like a possible murphys law kinda thing ? LOL maybe its time for a carburator ? ;-) LOL 15psi ya say ? No fluctuations allowed ? Mike Link to comment Share on other sites More sharing options...
jteckmann Posted February 24, 2010 Share Posted February 24, 2010 Possible fuel pump ? . . . Now that would truely suck, there aint but maybe 1,500 miles on the fuel pump and maybe 500miles on the fuel filter ! Sounds like a possible murphys law kinda thing ? LOL maybe its time for a carburator ? ;-) LOL 15psi ya say ? No fluctuations allowed ? Mike To the best of my memory, it was between 12-15psi (I'm searching for my manual to double-check, but can't find it at the moment) Hopefully someone will correct me if I'm wrong. When I was having a similar type of hard to diagnose problem, I was told that it should always be 15psi or at the high end of the range. That fluctuations or changes with rpms were a big red flag something was wrong. Maybe not the pump itself, but something in the delivery. Could be a clogged filter sock on the tank inlet, loose connection/ground, etc. You said you've already done cap/rotor/wires, and checked the ICU/coil. Based on what you described looking at the injector, I'd work my way backwards> Check the injector, the TPS, fuel lines, filter, pump, and all wiring/connections between them. Link to comment Share on other sites More sharing options...
KillerCOM Posted February 24, 2010 Share Posted February 24, 2010 its supposed to have 15 psi, and if you need another injector look at Venom Performance i picked one up from them its a remanufactured unit but it works great. it was 85 bucks when i bought mine. http://www.4wd.com/productdetails.aspx?partID=9690 Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 24, 2010 Author Share Posted February 24, 2010 :clapping: that's what i must do :smart: Parts replaced as of yet: Cap/Rotor/wires/Plugs/Fuel pump/fuel filter/Coil Ignition Module tested-Good , but was told with it being intermittent could still be the problem. parts left: Injector / Fuel pressure regulator / Possible I-M. oh yea and a bloody alternator :fs1: can't catch a break :wall: oh well i guess :dunno: Mike Link to comment Share on other sites More sharing options...
dasbulliwagen Posted February 24, 2010 Share Posted February 24, 2010 don't FORGET THE 02 SENSOR... I TELL YA IT FIXED MINE!!!!! Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 24, 2010 Author Share Posted February 24, 2010 :bowdown: O2 sensor :D . . . Bloody truck . . . Injector, fuel reg, I/M, O2 sensor . . . Mike Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 24, 2010 Author Share Posted February 24, 2010 :wall: I'm down i'm down :fs1: i got nothing more then a fast idle, i made it about 100 yard's that was all she wrote ! :mad: I limped home at 2.5mph jerking and bucking the whole way :hmm: i did take some video after i got the heap back home for ya :thumbsup: :yes: processing now, i'll add as soon as it goes live :smart: Video: http://www.youtube.com/watch?v=U04poevHoWU Mike Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 24, 2010 Author Share Posted February 24, 2010 Video: http://www.youtube.com/watch?v=U04poevHoWU this help ya any ? New parts: Cap Rotor. Plugs. Wires. Coil. Fuel filter. Fuel pump 1,500 miles ago. Mike Link to comment Share on other sites More sharing options...
AMC-MJ Posted February 24, 2010 Author Share Posted February 24, 2010 Where is the fuel port in this thing ? . . . I have look all over it and i can NOT find the Tire valve stem looking deal for checking fuel pressure that my 5.7L GM & 5.8L Ford had . . . buddy of mine said i should be looking for a tire gauge on it looking unit as the other 2 unit had . . . I saw no such device :dunno: I'm stuck at home :fs1: time to crush it ? :dunno: ? Mike Link to comment Share on other sites More sharing options...
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