Hey guys,
I posted this on JU too so I apologize if you've already seen it, not trying to spam up the interweb with this but I'm really out of ideas and thought I might give it a shot over here.
Problem is the '88 XJ 4.0L has begun stalling randomly, it first did it about a week ago the day after I did a SeaFoam treatment into the intake manifold. I replaced the TPS and IAC as both were original to the jeep and I had planned to replace them soon anyway, and I ran it at 2500 rpm for another 15-min stretch thinking maybe I still had some seafoam in there. It ran good for 3 days of around-town driving but then last night died on the highway after about 15 minutes of driving.
I bought this jeep about 2 months ago and have replaced:
-IAC & TPS (as mentioned above)
-plugs, wires, cap, rotor
-CPS
-fuel pump & filter
-CCV lines
-starter, alternator
-converted from closed to open cooling system (about 3 days before the seafoam, so it's possible this is related). Used a 1981 Corvette Temp Sensor as detailed on Lunghd's site.
-Oxygen sensor
-removed and cleaned throttle body
-removed and cleaned valve cover
-fuel injectors (one was leaking....FoMoCo 19# replacements)
-and the battery is 1 yr old according to date sticker on it (from PO).
At this point, I'm out of ideas. I don't know what can cause this type of apparently random stalling, it does seem slightly more likely to stall when accessories are running so I'm thinking it might be electrical but the voltmeter is fine when it dies and there's no symptoms of low power (the alternator failed about a month ago so I'm familiar w/the slow blinker, dim lights, etc common when there's an alternator problem). I guess it's also worth mentioning that the alternator I bought to replace the OE one failed about 1 week after I replaced it, so I'm on the second alternator. However, this one has been fine so far.
The really strange thing is that the stalling started right after the seafoam. I had driven it about 3000 miles of highway and city driving before the seafoam and it drove decent, except for the alternator failing but it was a real old alternator so that wasn't too suprising.
I'm going to clean all the grounds for the battery cables and replace them with 2-gauge. But other than that or replacing the CPS and the 02 sensor again, I don't know what to try. However, the jeep runs fine when it runs (idles perfect, no mis-fire, no stumble, etc) so it seems strange the 02 sensor could be to blame here.
Jeep does not backfire, the cat converter is new about a month before I bought the jeep (have the receipt from the PO). Oh, and I did pull 3 plugs to inspect them after seafoam but they looked good, and again no stumbling or mis-fires are happening...just stallin'.
ANY SUGGESTIONS VERY MUCH APPRECIATED! Pulling my hair out here, and the worst part is this was gonna be the winter beater for the wife but she's so gun-shy from the stalling problems I don't know if she'll ever want to drive it.
I posted this on JU too so I apologize if you've already seen it, not trying to spam up the interweb with this but I'm really out of ideas and thought I might give it a shot over here.
Problem is the '88 XJ 4.0L has begun stalling randomly, it first did it about a week ago the day after I did a SeaFoam treatment into the intake manifold. I replaced the TPS and IAC as both were original to the jeep and I had planned to replace them soon anyway, and I ran it at 2500 rpm for another 15-min stretch thinking maybe I still had some seafoam in there. It ran good for 3 days of around-town driving but then last night died on the highway after about 15 minutes of driving.
I bought this jeep about 2 months ago and have replaced:
-IAC & TPS (as mentioned above)
-plugs, wires, cap, rotor
-CPS
-fuel pump & filter
-CCV lines
-starter, alternator
-converted from closed to open cooling system (about 3 days before the seafoam, so it's possible this is related). Used a 1981 Corvette Temp Sensor as detailed on Lunghd's site.
-Oxygen sensor
-removed and cleaned throttle body
-removed and cleaned valve cover
-fuel injectors (one was leaking....FoMoCo 19# replacements)
-and the battery is 1 yr old according to date sticker on it (from PO).
At this point, I'm out of ideas. I don't know what can cause this type of apparently random stalling, it does seem slightly more likely to stall when accessories are running so I'm thinking it might be electrical but the voltmeter is fine when it dies and there's no symptoms of low power (the alternator failed about a month ago so I'm familiar w/the slow blinker, dim lights, etc common when there's an alternator problem). I guess it's also worth mentioning that the alternator I bought to replace the OE one failed about 1 week after I replaced it, so I'm on the second alternator. However, this one has been fine so far.
The really strange thing is that the stalling started right after the seafoam. I had driven it about 3000 miles of highway and city driving before the seafoam and it drove decent, except for the alternator failing but it was a real old alternator so that wasn't too suprising.
I'm going to clean all the grounds for the battery cables and replace them with 2-gauge. But other than that or replacing the CPS and the 02 sensor again, I don't know what to try. However, the jeep runs fine when it runs (idles perfect, no mis-fire, no stumble, etc) so it seems strange the 02 sensor could be to blame here.
Jeep does not backfire, the cat converter is new about a month before I bought the jeep (have the receipt from the PO). Oh, and I did pull 3 plugs to inspect them after seafoam but they looked good, and again no stumbling or mis-fires are happening...just stallin'.
ANY SUGGESTIONS VERY MUCH APPRECIATED! Pulling my hair out here, and the worst part is this was gonna be the winter beater for the wife but she's so gun-shy from the stalling problems I don't know if she'll ever want to drive it.