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Okay. I'm gonna try looking for answers here one last time before I head to a shop.

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Old 09-08-2015, 09:25 PM   #1
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Default Okay. I'm gonna try looking for answers here one last time before I head to a shop.

It's been 4 weeks now and I'm done. I'm either gonna take it to a shop or put a carb on it. Here's the break down...

92 Cherokee Laredo 4.0.

History...
Fully rebuilt the engine two months ago so the engine itself is fine.
One month ago I noticed a coolant leak from the bellhousing.
Removed tranny and saw bad freeze plug.
Replaced freeze plug, replaced tranny.
Noticed pinhole fuel leak in hose between fuel pump and fuel filter. Replaced hose and filter.

Problem...
Starts, idles, will NOT rev past 2k rpms. Just spits and pops and gasps.

What I think caused it...
I DID forget to unhook the battery when I started to remove the tranny and the starter arced against the frame.

What I did...
I have replaced the ECU, the crank position sensor, the o2 sensor, the ignition coil, the cap and rotor.
Getting spark out of all six wires.
Fuel pressure test shows 36 to 40 psi at all times.
I tested the TPS and it showed a volt range of .060 to .200. It is supposed to be .200 to 3.80ish.
Bought an Autozone TPS and it read the exact same voltages so I took it back.
Bought an O'Reilly TPS and it read the exact same voltages so I took it back.
While examining the wire harness a frayed wire to the TPS grounded against the manifold and caused the fuel pump to cycle.
I then fixed the frayed wire and now the (original) TPS reads perfect voltages. (.300 to 3.80ish).

Problem as of now...
Will NOT stay running when cold. I have to start it about 15 times before it holds a TERRIBLE clunky idle.
The idle gets better and better until it warms up and idles just fine, but it WILL NOT REV PAST IDLE.
It just clunks and pops out the intake and out the exhaust and acts like it is missing terribly but will NOT rev past 1000k to 1500k.
Stinks to high heaven. Plugs are all fouled.
Removed muffler and can see bright glowing red inside the catalytic converter.

What. In the hell. Do I do now? Please, ANY suggestions whatsoever I will try them all.

Thank you.

Last edited by Zerocyde; 09-08-2015 at 09:30 PM.
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Old 09-08-2015, 09:30 PM   #2
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Well, your converter is bad for one, and that can cause some of the symptoms you're describing. Replace it and go from there, if necessary.

Last edited by 4WD4EVER; 09-08-2015 at 09:30 PM. Reason: Spelling
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Old 09-08-2015, 09:35 PM   #3
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Well, your converter is bad for one, and that can cause some of the symptoms you're describing. Replace it and go from there, if necessary.
That's what I've been wanting to do but everyone says "converter glowing red just means it's running very rich and the converter is burning a bunch of extra fuel but the converter itself is fine."

Also, I unbolted the entire exhaust from the exhaust manifold and ran it open header with the o2 sensor plugged in and it ran just the same.
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Old 09-08-2015, 09:41 PM   #4
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Well, I believe a converter that is glowing red means it is plugged. You may have another issue(s), but that converter is ruined.

Edit: Any codes? You may have an ignition issue that's causing it to run rich. I would check my ignition system well and be sure it's firing correctly.

Last edited by 4WD4EVER; 09-08-2015 at 09:44 PM. Reason: Additional info
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Old 09-08-2015, 09:48 PM   #5
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At one point I got...

33 Air conditioning clutch relay circuit open or shorted

Then I got...

33 Air conditioning clutch relay circuit open or shorted
and
23 Incoming air temperature sensor may be bad

Then It was...

35 Cooling fan relay circuit open or shorted

Currently it is showing no codes.
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Old 09-08-2015, 10:01 PM   #6
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You need to check the air temp sensor then. And the wiring in that circuit. I wouldn't replace the cat until you get the rest sorted out.

Honestly, if you're in over your head and you plan on keeping this rig, I'd recommend taking it to a skilled technician that has a solid reputation in your area and let him/her sort it out.
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Old 09-08-2015, 10:05 PM   #7
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Default Okay. I'm gonna try looking for answers here one last time before I head to a shop.

Timing? Lifters?
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Old 09-08-2015, 10:11 PM   #8
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Quote:
Originally Posted by Zerocyde View Post
Fully rebuilt the engine two months ago so the engine itself is fine.
If it's never run correctly this is the first and most likely suspect.
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Old 09-08-2015, 10:17 PM   #9
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Quote:
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If it's never run correctly this is the first and most likely suspect.
No it ran perfectly after the rebuild. This started when I pulled the tranny to fix the freeze plug.
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Old 09-08-2015, 10:18 PM   #10
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Timing? Lifters?
Could pulling the tranny affect that?
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Old 09-08-2015, 10:18 PM   #11
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Quote:
Originally Posted by Turbo X_J View Post
If it's never run correctly this is the first and most likely suspect.
^ That's certainly a strong possibility.

This may help with the MAT sensor:


http://www.lunghd.com/Tech_Articles/...iagnostics.htm
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Old 09-08-2015, 10:18 PM   #12
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No it ran perfectly after the rebuild. This started when I pulled the tranny to fix the freeze plug.

Wiring.
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Old 09-08-2015, 10:22 PM   #13
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[QUOTE=4WD4EVER;3139254]^ That's certainly a strong possibility.


Scratch this then...

I agree with Turbo. You need to check the wiring.
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Old 09-08-2015, 10:34 PM   #14
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Default Okay. I'm gonna try looking for answers here one last time before I head to a shop.

Quote:
Originally Posted by Zerocyde
Could pulling the tranny affect that?
No. Just giving you ideas.

It happened the FIRST time you started after the tranny? It might be smart to pull it again and see if you pinched wires in between the block and bell housing. Like they said. Wiring. O2 wires run that way, check all of them.
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Old 09-08-2015, 11:40 PM   #15
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Shot in the dark; throttle valve cable properly attached and adjusted?
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