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Unread 06-26-2013, 03:46 PM   #1
parkia86
Registered User
1987 MJ Comanche 
 
Join Date: Jun 2013
Location: Westerly, Rhode Island
Posts: 1
Trouble with the Comanche!

To get started I have an 87 Jeep Comanche Laredo with the 4.0L engine and 4x4. The transmission is the 3 speed auto.

This morning the Comanche started up fine but about 2 minutes into the drive she just stalled out. This has happened before and I just put it in park and she fired right up. About 6 hours later I was going to lunch and she would not start. The engine was cranking and she would sputter a bit as if she wanted to start but she wouldn't. After about 10 min I sprayed some starter fluid into the intake, she didn't start the first time but after several tries and putting starter fluid in the intake she fired up and I got her home. This is the second time she has done this and now I fear it's permanent, a few hours after getting home I tried again and she still failed.

Work to date:

I replaced the fuel injectors and the air throttle valve about 1.5 years ago.
I do not remember the last time I did plugs and wires and distro cap.
Replaced all of the engine bay vacuum lines.
The battery is less than 2 weeks old.
Fuel filter was replaced 3 yrs ago.

Odd symptoms:

I hear a strange buzzing/hissing coming from the vicinity of the fuel pump(assuming its the circular thing on the fuel tank). I put my hands on the vacuum lines in the area and could not detect a leak. I had the car in a garage this winter and prior to taking it out I have never heard that sound from the fuel tank.

Spraying carb cleaner will eventually get her started but takes multiple attempts.
If the engine is warm she will start.


Please help! I'd love to fix her this weekend

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Unread 06-27-2013, 06:18 AM   #2
zackcj7
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1997 TJ Wrangler 
 
Join Date: Apr 2011
Location: Atlanta, GA
Posts: 310
Fuel pump is going out. Pretty common problem on the Comanches. When they start to get loud it's a sure sign it's about to die.

It's not too bad of a job to replace. Pull the rear driveshaft for access, some people remove the tank some don't. I recommend the Bosch turbine style replacement pump.

Check out comancheclub.com if you haven't already.
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Unread 06-27-2013, 04:20 PM   #3
cruiser54
Web Wheeler
 
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1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 10,179
Quote:
Originally Posted by zackcj7 View Post
Fuel pump is going out. Pretty common problem on the Comanches. When they start to get loud it's a sure sign it's about to die.

It's not too bad of a job to replace. Pull the rear driveshaft for access, some people remove the tank some don't. I recommend the Bosch turbine style replacement pump.

Check out comancheclub.com if you haven't already.
Good idea. And replace the filter at the same time.
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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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