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Unread 01-18-2014, 05:54 PM   #1
2tall2slow
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Before I Start, how hard is it?

I have a sneaky suspicion that my fuel pump is going bad. What are the tell tale signs of this? And before I attempt to replace myself, how hard is it? 94 Cherokee.

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Unread 01-19-2014, 06:32 PM   #2
laybackman
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Quote:
Originally Posted by 2tall2slow View Post
I have a sneaky suspicion that my fuel pump is going bad. What are the tell tale signs of this? And before I attempt to replace myself, how hard is it? 94 Cherokee.
Why are you suspicious that your fuel pump going bad? Symptoms?



First thing you have to ask is when did the inline fuel filer get changed? Don't know? Then it is time to do that before you go dropping the gas tank and swapping out the fuel pump. At least that is what I would do.
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Unread 01-20-2014, 03:39 AM   #3
2tall2slow
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I am changing filter this afternoon 1st, before i do anything expensive. It was last changed approx 3-4 years ago. Jeep sputters and kicks randomly like it isnt getting enough gas. Used some really good injector cleaner that shouldve wofked but didnt, thats leading me to filter/pump.
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Unread 01-20-2014, 06:55 AM   #4
laybackman
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Another cheap fix is to remove the Throttle Position Sensor and clean it AND the bore it sits in with 0000 steel wool and carb cleaner. Do not pull the end of the TPS out of it's body or you have to buy another one.

I would also test fuel pressure at the fuel rail.

Or, it might be a fuel pressure regulator problem.

You are assuming that the problem is fuel.

I would throw a timing light on this engine and see what the timing does when you increase the RPMS. That is when it is running poorly. A stretched timing chain could be the problem.
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"Taking care of our veterans is a cost of war. If you can spend six trillion dollars sending people to war, you can spend a few billion dollars taking care of them when they come home"
Sen. Bernie Sanders (I-Vt.)

If what doesn't kill you, makes you stronger, I should be able to bench press a Grand Cherokee by now!
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Unread 01-20-2014, 07:16 AM   #5
cruiser54
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Quote:
Originally Posted by laybackman View Post
Another cheap fix is to remove the Throttle Position Sensor and clean it AND the bore it sits in with 0000 steel wool and carb cleaner. Do not pull the end of the TPS out of it's body or you have to buy another one.

I would also test fuel pressure at the fuel rail.

Or, it might be a fuel pressure regulator problem.

You are assuming that the problem is fuel.

I would throw a timing light on this engine and see what the timing does when you increase the RPMS. That is when it is running poorly. A stretched timing chain could be the problem.
I think you meant Idle air Controller? Not TPS?
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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
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http://www.cherokeeforum.com/g/album/1725214
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Unread 01-20-2014, 07:21 AM   #6
laybackman
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I think you meant Idle air Controller? Not TPS?
GOOD CATCH!!!!! IAC not TPS



Gotta get some coffee into me before typing.
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"Taking care of our veterans is a cost of war. If you can spend six trillion dollars sending people to war, you can spend a few billion dollars taking care of them when they come home"
Sen. Bernie Sanders (I-Vt.)

If what doesn't kill you, makes you stronger, I should be able to bench press a Grand Cherokee by now!
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Unread 01-20-2014, 07:32 AM   #7
cruiser54
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Quote:
Originally Posted by laybackman View Post
GOOD CATCH!!!!! IAC not TPS



Gotta get some coffee into me before typing.
I know all about that!!
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Quote:
Originally Posted by chris87xj View Post
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 01-20-2014, 05:01 PM   #8
2tall2slow
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I am assuming that the problem is fuel. Just took the dreaded gasoline bath changing my filter. Hope that'll do it because I have no idea how to check my fuel pressure regulator or test for pressure at the rail. Let it be known, my tool box consists of some sockets, wrenches, and a DMM. A handy go-to. BTW. Idle air controller is what exactly?
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Unread 01-20-2014, 05:08 PM   #9
cruiser54
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Quote:
Originally Posted by 2tall2slow View Post
I am assuming that the problem is fuel. Just took the dreaded gasoline bath changing my filter. Hope that'll do it because I have no idea how to check my fuel pressure regulator or test for pressure at the rail. Let it be known, my tool box consists of some sockets, wrenches, and a DMM. A handy go-to. BTW. Idle air controller is what exactly?


http://www.cherokeeforum.com/f51/tbi...eaning-179079/
__________________
Quote:
Originally Posted by chris87xj View Post
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
cruiser54 is offline   Reply With Quote Quick reply to this message
Unread 01-21-2014, 08:50 AM   #10
2tall2slow
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Join Date: Jul 2013
Location: Coleridge, NC
Posts: 126
Filter didn't seem to be the problem. Very good, detailed information and seemingly easy inexpensive tips to troubleshooting there cruiser. This will be my reference today.
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