702_MJ Posted November 13, 2013 Share Posted November 13, 2013 I got an 86' with 92' 4.0. It left me stranded the other day, after putting a new CPS and fuel pump in I got it home. Just got some new wheels and tires so I threw them on, went for a drive and everything was going good. Then the motor had like a hesitation and when I gave it more gas it had an after fire out of the exhaust, got it back home and it was running at a lower than normal idle and the motor would act almost tryin to catch itself and idle up a bit and then back down again. Anyway, it almost sounds like ignition and timing....but with a new CPS what else is there that does timing? Link to comment Share on other sites More sharing options...
Blue88Comanche Posted November 13, 2013 Share Posted November 13, 2013 how long have you had the motor in your 86? Has it been rebuilt recently? is the new fuel pump for a HO 4.0, or the stock V6 or I4? When was the distributor replaced last? Have you tried another engine computer? Have you checked the timing? I can't really help, but more info will likely get better and quicker response. Link to comment Share on other sites More sharing options...
702_MJ Posted November 13, 2013 Author Share Posted November 13, 2013 This motor has been in this truck for about 4 years. The fuel pump is for a 4cyl because the 4.0 pump doesn't fit inside the unit, I tried last year when I changed it before. Distributor has never been replaced, has performance distributor cap, rotor, wires, and screamn demon coil, all installed like 4 years ago, could probly use a spark plug change. Just did an aw4 to ax swap a couple months back so this is a different comp, haven't tried putting the old aw4 comp back in. I haven't checked timing, I figure it's all electronic controlled, cps, ECM and maybe MAP would influence it the most i think, it was running fine last week. It just started last night, i wish I could just be working on it and look at all your suggestions right now but.....gotta work.... Link to comment Share on other sites More sharing options...
Blue88Comanche Posted November 13, 2013 Share Posted November 13, 2013 when the flywheel was swapped was it properly aligned? Link to comment Share on other sites More sharing options...
702_MJ Posted November 13, 2013 Author Share Posted November 13, 2013 To my knowledge I aligned it right. The bolts only line up a certain way. BUT the last CPS looked like it got rubbed a bit....but that is honestly my worst fear....gotta pull that whole TNT kit off one weekend to do it! But you may have a point, I'll check the new CPS for wear Link to comment Share on other sites More sharing options...
Blue88Comanche Posted November 14, 2013 Share Posted November 14, 2013 could be possible the flywheel is warped causing physical contact with the cps. was it a new or used flywheel? Link to comment Share on other sites More sharing options...
702_MJ Posted November 14, 2013 Author Share Posted November 14, 2013 Possibly, but I would think if it was warped it would give trouble immediately on start up. Flywheel is new, fired it up yesterday after work and it idles fine now...so maybe I gotta go drive and put load on the motor to get it to do it again Link to comment Share on other sites More sharing options...
carnuck Posted November 20, 2013 Share Posted November 20, 2013 EGR sticking open? Link to comment Share on other sites More sharing options...
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