Blaine Posted June 8, 2015 Posted June 8, 2015 87 4.0L did some research on here, couldn't get exact issue, but my truck at idle sounds like its cam'd running rough, the it will pick up and run fine, then back to rough, sometimes when i shift to drive or reverse it will stall, it will start fine though. MAP sensor is ok, undo the vac line and it stalls, but when i unplug the idle air control valve no change, wondering if thats the issue?
HOrnbrod Posted June 8, 2015 Posted June 8, 2015 Please edit your signature detailing the year, engine, etc. of your truck.
Blaine Posted June 8, 2015 Author Posted June 8, 2015 done, and this issue is on the 87 4.0 guess that makes it easier for everyone huh, lol. forgot to do that :doh:
Megadan Posted June 9, 2015 Posted June 9, 2015 Could be a combination of issues. Have you done any of Cruisers Renix tips yet? If not, start there.
Blaine Posted June 9, 2015 Author Posted June 9, 2015 I have done some. As of today it has gotten worse, my gf said it had stalled on her while driving around 10-15mph it has never done that to me, I'm doing a tune up tomorrow on it, after that give ill give an update. just thought when I unplugged that idle air control valve I would have noticed a change.
Megadan Posted June 9, 2015 Posted June 9, 2015 You could clean up the TB passage for the IAC, it may be plugged up causing you to notice no change. I would also check/test the O2 sensor, as some of your symptoms are similar to those with a bad O2
Blaine Posted June 9, 2015 Author Posted June 9, 2015 makes sense because I just did the valve cover mod for sucking oil into the air filter through the pcv system, could very well be oil film hindering a good signal and my CAT is cleaned out has been for years, O2 woud have picked that up wouldn't
Blaine Posted June 11, 2015 Author Posted June 11, 2015 the tune up helped out a lot, although the dumbasses at AutoZone gave me autolite when I ORDERED NGK's, better then what I had but will replace soon. drives good, idle still funky but going to do some more of cruiser's tips before I start throwing parts at it,
cruiser54 Posted June 12, 2015 Posted June 12, 2015 On an 87, do Tips 1 through 5 with no shortcuts. Consider 27 at some point. What parts did you replace in the "tune-up"?
Blaine Posted June 14, 2015 Author Posted June 14, 2015 (edited) i had a new button,cap and wires. so i did plugs, air filter, oil change. today i did tip 1&2, did #26 valve cover mod a week ago. it still idles funky start it up idles fine, then rough back to fine and so on. this motor is new i put it in a few months ago its been running fine till recently. cannot remember what year cherokee it came out of but was around the same cuz its a renix. all i have done is replaced the starter and this has been happening not long after Edited June 14, 2015 by Blaine
cruiser54 Posted June 14, 2015 Posted June 14, 2015 i had a new button,cap and wires. so i did plugs, air filter, oil change. today i did tip 1&2, did #26 valve cover mod a week ago. it still idles funky start it up idles fine, then rough back to fine and so on. this motor is new i put it in a few months ago its been running fine till recently. cannot remember what year cherokee it came out of but was around the same cuz its a renix. all i have done is replaced the starter and this has been happening not long after Do 3 through 5 and then let's revisit this as needed.
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