gators_2006

That's what I'm use to seeing, a flush mount TPS. But this one was designed like that. I included a stock pic of the type I have. Except mine is has a small river holding the "arm" to my TPS and not a screw.

Thanks for the site info. I'll definitely be reading through that. It's been a while since I have worked on these things. Wife always has a new(er) SUV that you have to be a MIT grad to work on, and I drive an old '94 F250 7.3idi. It's been a while since I have toyed with one of these tings. I bought a bone stock, RV towed everywhere, '94 XJ in the mid 2000's. I knew that thing inside and out, and went from bone stock to a pretty decent trail ride. After starting to have kids and realizing it was more important to put money towards their food, and not the XJ's crank sensor (I kept spares in the glovebox), I let her go. I swear I was running behind that thing in slow motion, crying, reaching for it as a toddler reaches for his mother, as it pulled out the drive. I think I even heard depressing music playing from out of no where as that unfolded...... So needless to say, I have been waiting to get my hands on another. Wife goes on a weekends girls trip, tells me how much she loves the new Gladiators and that she wanted me to get a "Jeep Truck". So I did...... just not the Jeep truck SHE was wanting. But I digress from the main topic. I did notice last night, after I as checking the voltage on the TPS, and moving it to wide open several times, it didn't seem to act up as much on my way home from work. When I got home, I looked closer at the TPS and noticed that unlike the others that I'm use to seeing, this one is not mounted flush with the TB. It' off by 1/2"-3/4" and it has a metal arm that rests on a TB link. Don't know it this was a poor design, or what. There was a lot of dirt and grease almost covering the entire "linkage" between the TPS and the TB. I took some cleaner I had and really sprayed it all down and got all up in their and made sure I cleaned around the mechanism where it went into the TPS housing. Haven't checked my voltage this morning, but it never had the first hiccup on the way to work. Makes me wonder if there is enough of a gap between the TPS housing/body/whatever you want to call it, and the mechanism /linkage that comes out and goes to the TB link. So with the age of everything, and it seeming like the TPS is at least part of the problem (voltage dropping to 0 at half throttle when testing before cleaning), I will go on and order a new one, and proceed with giving everything else a thorough "once over". Thanks for the suggestions and info everyone.

I checked the TPS tonight. I put my meter on B and C and got my 5vdc. When going from B to A, I had .348vdc at full close, and as I slowly opened the throttle, it adjusted to 1.01vdc at around half throttle ad then dropped to 0.001vdc. I'm not a mechanic by trade, but I wouldn't expect the voltage to drop to O at half throttle. It should level out and stay constant, correct?

Sorry, I'll try and edit that one. My mistake. I was talking about the inline fuel filter on the frame. The fuel that was in it, when dumped out was clear, coming from the "IN" port, but was so cloudy coming out of the "out" port. So I know the fuel filter isn't an issue now that I changed it. I am going to do a compression test hopefully by this weekend. My tester is out at our farm and I just haven't had the chance to go pick it up yet. I di throw a small tach on it last night as well. This one has me stumped somewhat. I did notice this morning that it really isn't at a certain rpm range like I originally thought. I could be at 1800, or I could be at 2800. Didn't matter. It would be nice and smooth (once it quit bogging and missing) and as soon as I press the pedal about 1/4 of the way, it starts bogging and missing. Once I get past about 1/2 to 3/4 pedal, and the rpm's come up, it stops acting up. So that has me wondering if it might be the TPS. But I could be wrong.... won't be the first time and won't be the last.

All sensors look like they have never been messed with, at least not in a long, long time. I didn't check compression yet, but I did pull the plugs and they look good, all 4 look the same. Cap was clean, no build up and rotor was clean. Pulled the fuel filter and the back flow from it was clean, but almost looked like milk coming through it. So I changed the filter. Still no change. I did notice that, if I run through 1st and 2nd pretty hard, I notice a slight bog, but it pushes through it with no problem. If I ease into 1st and 2nd, it's real noticeable. Once I hit 3rd and 4th, due to the gearing and that it takes longer to run through those gears, I really notice the bog and the miss. More so if I am trying to go full throttle vs babying it. But either way, it's there. But, as usual, not a hiccup when in neutral. If start testing sensors, would the TPS be the first one everyone would check first? Plus, where would I need to look for grounding in the cab for the instrument panel, etc...... The ground is good from the battery to the block, but I'm going to swap out a few other of the grounds and beef them up along the way. I work for a utility company so I get #6 flat braided ground wire by the 25 foot rolls!

Will do. I thought about the cap and the coil, just as preventative measures, but then I forgot how old I'm getting and that I should be responsible, and for a minute or two was contemplating what would happen if I just so happened to accidentally dropped in my MSD control box and setup I use to use when I was roundy round racing and running the strip. I mean it was all on a v8, so with 4 cylinders, it should be great! But then I came back down to earth and threw that idea out the window, and never got back around to checking the cap.

I'm going to check the filter this afternoon. I know it looks new, but that doesn't mean anything. I have run a few cans of seafoam through it since the guy I got it from was using it as his "dump" truck once a month or so when he needed to make a dump run. But even at that, I've probably run 100+ gallons of fuel through it in almost the year that I've had it. The TB does look like it a little dirty, but they all tend to do that over time. I want to take it off and give it a good cleaning, but I want to fix a problem first, before I start doing "side" projects that might make the first problem worse and compound what's going on.

History of the truck. I bought it end of last spring. It had a leaking brake booster, so I disconnected the vacuum line and capped the line (who needs power brakes on a small truck!). That resolved the extreme high idle. I also replaced a few other vacuum lines that didn't look all that great. Other than that, I haven't done anything to it. Been running like a top, until a few days ago when this started happening. The guy I bought it from did put new plugs and wires on it, I'm not going to bad mouth anyone here, but after talking to him when I was buying it, I could tell he was throwing parts at it to fix the idle issue, not knowing it was vacuum related. I do want to pull the plugs and check to make sure they were gapped correctly and figured that while I have them out, might as well put my pressure tester on it and check compression on each cylinder. The block still has factory paint on it, but the head doesn't. Looks like some head work has been done previously. That's about all I can tell you as far as engine history. Brakes were a different story............

Hello everyone. New to the forum, and come seeking some advice. I have tried to search for my issue, which it seems a lot have, but every thing I come up with, is for a year or two newer model than what I got. So, let me get to it...... Got a 1986 MJ (of course), with the 2.5L, 4 speed manual, 4x4, blah blah blah...... Love the little truck. Especially the fact that it still has AMC branding on many of the parts. Heck the title shows it as an AMC truck. The issue I am having, and it seemed to come out of nowhere the last few days, is when accelerating, it misfires and bogs down, but only through a certain RPM range. I don't have a tech, so I can't tell you what rpm's it's missing at, but it's probably a range of 500-600 rpm's starting at 2000 rpm's would be my guess. Anything before that and it's nice and smooth. Once I get past that range, it's fine. I can push in the clutch and rev it and it never has the first miss or anything else, rev's just fine. This only happens when in gear, and it doesn't matter what gear. It will do it when the weather is cold, it will do it when it's hot, doesn't matter. Cold start or been running for hours, still does it. Every once in a while it will act like it clears up by itself, but not often. Happens on hard acceleration or accelerating like grandpa. Any ideas?