Any Jeep Mechanics Here?

[Altarboy]

My Wrangler has a miss that I cannot trace even after I extracted its diagnostic codes. It runs well till it warms up, then it misses when I accelerate. Running along it is fine. Giving it gas causes the miss, but only after it is warm. I have replaced the plugs, rotor and cap, coil, throttle pos sensor, and treated it to some really good injector cleaner. Reckon it is an O2 sensor or map sensor? I am running out of ideas. It only has 60k on it.

[63DH8]

Have you replaced the PCV valve? Don't try to shake to see if it's working, or clean it. Replace it. They're only a couple of bucks. These days, with the high tech BS the makers install in the engine, if the PCV valve isn't working exactly right, it can throw everything off kilter.

Something else to try is take a propane torch. Do NOT light it. Open the valve and run the torch around the vacuum lines, the position sensor, intake manifold, et al. If the engine's rpm changes or if the engine smoothes out, you have a vacuum leak.

Check the O2 sensor. Unplug it and start the engine. Place a multimeter on the leads and measure the voltage. It's one of the few sensors that will produce voltage. See if there's an increase in voltage as the engine heats up. Off the top of my head, I don't remember what it's supposed to read. If there's no increase, then you may have a bad O2 sensor.

A bad thermostat may be something else that is causing your engine to stumble after it's warm. The engine will think it’s still cold and keep the air/fuel ratio rich. Same thing could happen if your temperature sensor is bad.

Off the top of my head, these things will make a computer controlled engine stumble or miss after it’s warmed up. I may be missing something else though.

[JustAndreaNKids]

While I'm not the mechanic, I am the daughter of a mechanic. I can say that my Eclipse was doing the same thing. At first I just thought I had a bad tank of gas, but when the problem didn't stop I started looking into it. Trial and error. I keep up with regular maintence, it recently had had a tune-up, etc... It ended up being the O2 sensor and it's a smooth running, peppy Go-Cart! :D
Can't Auto Zone check the O2 Sensor? I think they can. Better to make sure that's the problem before spending your money on something that you may not need!

[FredMaxwell]

God help Me im SO Wasted, but ive been trygin to type better lately as of late fucking Ima try to make sesne so LITSEN TO ME I want to help you
I love to help People I swear to god



Heatign wires increases, their resistance...
Now
If, your wires (PLUG WIRES) Are anywhere close to heat()Manifold for exmaple) then when they heat up, their resisstance increases, poof, no Sparky Sparky
You can Have the shop test the resistanc,e of each wire or do it with a multimete,r cause the failign ones are liable to be weak cold too


Kinda, like a stubborn gook gurlie with a retainer On her teeths or a tootheache

[Mr Magoo]

Possibly a dirty gas filter too.

[284]

Originally posted by Altarboy
My Wrangler...
I could help ya but that's not a Jeep. :rotflmao:

They quit making Jeeps in 1971...as evidenced by your electronic maybe/maybe not problems. ;)

[Nobeard]

63DH8 is probably right--vacuum leak.

If its a straight 6 cyl,check where the bottom of the intake and the top of the exhaust manifold bolt together.
Its called the "heat riser" and theyre bad about getting leaks there.

Since its a computer controlled engine,it runs off the PROM in the computer until it warms up/goes into "closed loop".

If its got a bad sensor it should set a code,UNLESS its the MAF (Mass Air Flow) Sensor. If its got one,try tapping lightly on it when the engine is warmed up and running.See if that makes the engine stumble or miss.It will be somewhere between the air filter and throttle plate,usually on the intake.

Also--Chrysler fuel injectors have a problem with shorting out.
Check the resistance on them with an Ohm meter when the engine is hot.

Hope this helps.

[HDR]

Check all the above...

Open the hood at night, check to see if one of the plug wires is arcing...
I had a plug wire that broke down (arced) under load.

How many miles are on the wires, cap and ignition parts?

[payback308]

Originally posted by Congoloid
I could help ya but that's not a Jeep. :rotflmao:

They quit making Jeeps in 1971...as evidenced by your electronic maybe/maybe not problems. ;)

HEY !:D

I wish I could help as I ask a certain individual on this board any Jp question that may arise.

But I`ve never owned a Jp with 02 sensors,PCV things or electronics.

I keep telling myself I need the comfort of a "gnu" one,but things like this scare me off.

[284]

That's it Payback.
One time, I had a wrangler. Got one w/10K miles on it for 10K, so it was such a good deal, I had to get it...not to mention it had AC, heat, Stereo, doors, etc. the woman and her kid liked...

Well, one day, backed it up to the front door and loaded it up for a weekend four wheeling in the mtns. All packed, got in and couldn't start it. Everything worked, but no ignition.
Changed fuel filter. Still a no-go. So after an hour or two, was about to surrender and push it into the street, got into it and started it right up, no problems. WTF?
Well, turns out when the HO first came out, they had "problems" like that, where sometimes, once you turned them off, they'd not start up again. People would have to be towed out in the middle of trails, etc. Chrysler was no help.
And I was thinking of how far in BFE I'd get. Too far to have something just quit on me. I want something to WEAR OUT on me, thus give me a "heads up". Give me a stick shift, carb, points, etc. I'm fine.
Had a coil go out on me one time. Couldn't start it. (I since carry an extra). Well, just turned the jeep around and w/a push, jump started it. I think I drove that back to denver on compression ignition alone. ;)

Another time I put the throwout bearing through the pressure plate. Started it in gear and once going, just ground it into second and made it back home like that, no clutch. Just had to time lights. ;)

Now you see why my jeeps are built the way they are. Truck stick shifts, full floaters, dual batteries, etc.

PS: also the wranglers (and many new vehicles) have vacuum actuated 4wd. In snow, the rubber sometimes gets hard and develops a leak. The solution was to take it to a car wash and shot warm water at the transfer case. :rolleyes:
However, it worked.

Nah, give me pre-71 and a bag of 30 tools.
Even a monkey can keep them going.

[Altarboy]

I replaced the O2 sensor and unplugged all conectors under the hood and one of these things fixed it.

Congoloid, I also like the old Renegades, but around here they are all either rusted or, if in cherry condition, as expensive as my TJ. I have three tops for it and it has a 12 disc changer and the I6. I took it to colorado and toured some of the trails out there. They take their 4 wheeling seriously. It was about 12k feet that it started to act funny. I did think about having to pay to get towed out of the wilderness and how much it would suck. Ouch.

[payback308]

Cong,

Forgot to mention.
I`ve got the one piece axles,Moser.(your advice was good)
But that`s all I`ve got.

Manged to bust up my hardtop taking it off.:rolleyes:

You`re right on the lockers too.
The trutrac in front is best.

The detroit in front is a doozie to control.
I drove my friends truck I was telling you about.
He was there,wouldn`t let me try it alone.

On really muddy dirt roads,you really are steering in the opposite direction you want to go most of the time.
You have to stop before turning then ease into it to see which way to turn the wheels,which may not even relate to the direction you want to go.

Its a weird ride.Real slow too.

I`ve driven without a clutch once.The clutch rod that goes to the fork fell out somewhere.

[284]

Originally posted by Altarboy
I took it to colorado and toured some of the trails out there.
Yeah, that's what folks don't realize. They only see the fun, picturesque part. But unlike back east or other places, if you get in a bind, big bux. Also note that if you roll down a hill and don't get killed, you'llhave to deal with the govt in getting your vehicle out due to them not wanting you to build a road to get to it, which sometimes is the only way. Might just have to leave it there.
Also, with horseback riding in the wilderness type areas here, we take another rope and run it from the bit back and tuck it into our belt. We do this because if we get dumped by the animal and we're in BFE, we could easily die, especially if any injury such as a broken ankle/leg also happened.

Payback,
I told you those that put full time lockers in front are goofy.
But they do that because they can't afford another 4 bills and put in an ARB there. Or they're following bad advice...which is also popular now.
Good move on those axles. Now, just have someone (qualified) put a tack weld in those two access holes of the differential housing where the tubes go in. Those corp 20s can spin their tubes in the dif housing, so a quick tac or 2 on each side will get ya worryfree on that.
I`ve driven without a clutch once.The clutch rod that goes to the fork fell out somewhere.
:rotflmao:
Don't ya just love JEEPS!!! :D

Me and my GF were coming back from an "adventure filled" four wheeling trip one time. We did Holy Cross. Well, we were so grateful to be able to drive back, not to mention alive and in civilization that, as we were toodling down the road in one of my old jeeps, I smelled something burning.
Fuck it, I thought. I'll just keep driving and maybe it'll go away (typical jeeper).
Well, it didn't and only got worse. So after about 15-20 minutes of this, I finally pulled over and, not wanting to alarm my baby/copilot, I acted like I was just checking things in a nonchalant manner. Turns out I left the xfer case in 4lo.
Relieved that's all it was, I stuck it in 2hi, then as I sat back in my seat, I said, "That was the problem. I smelled something burning."
"Me too," She said, "but I didnt' want to tell you." :rotflmao:

[cowdawg]

Don't forget a good winch and a high lift jack.

[HOLMES]

i have a 91 cherokee,similar problem.i changed the egr valve,as stupid as it sounds for $14 it runs like a million bucks now.

[payback308]

Cong,
Its a small world.
My wife was riding with me when the clutch rod fell out.
Didn`t notice it was gone until I went to a slow down to go to a lower gear.
Wife just sitting there looking. :D

The look tells you what she`s thinking then she says,What now?

:D

You gotta get a wife.They add a whole new perspective to things