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Unread 02-03-2014, 09:51 PM   #1
bozzman080
Registered User
1987 MJ Comanche 
 
Join Date: Feb 2014
Location: castle rock, wa
Posts: 4
my 4.0 will not run right HELP!!!

I just bought a 1987 jeep Comanche 2WD 4.0 with 5speed
I am at a loss since when I test drove it she ran like a gusty 4.0 should loads of torque, now it is acting up
it was stalling and dying and the tachometer was jumping all over the place
so I did this so far
new
cap, rotor, wires, bosch platinum plugs, CPS, IAC, Fuel filter, all vacuum lines inspected and replaced as needed, Coil ,Ignition control module,
after all this a few hundred dollar's later she idles and revs only to around 2800rpm then dies out and falls on her face
also running very rich
I cant figure this out new TPS is on order
any other suggestion's , I am about to Craig's list her and walk away


Last edited by bozzman080; 02-04-2014 at 01:02 PM..
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Unread 02-04-2014, 06:48 PM   #2
Caish
Registered User
1987 XJ Cherokee 
 
Join Date: Jul 2010
Location: Arkansas
Posts: 604
unplug the Crank Position sensor and plug it back in and get one to replace it.
I would also suggest pulling it out and cleaning it off and might even try drilling
one of the holes out to a 3/8" so you can get it a little closer for better signal.

My 87 Renix occasionally won't start, when it happens, I just unplug mine and
plug it back in and its good for 2 to 4 months.
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Unread 02-04-2014, 07:57 PM   #3
cruiser54
Web Wheeler
 
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1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 10,320
Click on the link in my signature. Do posts 1 through 5. Platinum plugs suck BTW. NGK all the way.
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 02-04-2014, 11:58 PM   #4
bozzman080
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1987 MJ Comanche 
 
Join Date: Feb 2014
Location: castle rock, wa
Posts: 4
Shes alive , i can not believe it was the cat it was beyond plugged up so if you have done all that i did check that
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