Fuel pump ballast resistor on 95??? - JeepForum.com
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Unread 01-25-2011, 04:19 PM   #1
vrodek
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Fuel pump ballast resistor on 95???

Does anyone know if 95 xj sports have a fuel pump ballast resistor? I've seen pictures of where they are on other years which is right near the airbox, but mine doesn't.

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Unread 01-25-2011, 04:47 PM   #2
tjwalker
It's the crank sensor!
 
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My understanding is that the ballast resistor existed between 84-93.

95 would not have one.
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Unread 01-25-2011, 04:49 PM   #3
vrodek
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Is there anything like that on a 95?
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Unread 01-25-2011, 04:53 PM   #4
tjwalker
It's the crank sensor!
 
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The ballast resistor was there to reduce noise in the fuel pump circuit.

It was then determined by design engineers that it wasn't of much benefit and that the fuel pump could handle full voltage.

So it was therefore eliminated.
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Unread 01-25-2011, 04:55 PM   #5
mecompco
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My '94 and '95 do not have one, my '90 and '92 do. I don't have a '93 (yet).

Michael
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Unread 01-25-2011, 04:55 PM   #6
vrodek
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But I'm getting the exact same symptoms that a XJ with a resistor would be getting if it had gone bad. Like exactly the same.
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Unread 01-25-2011, 04:57 PM   #7
tjwalker
It's the crank sensor!
 
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Quote:
Originally Posted by vrodek View Post
But I'm getting the exact same symptoms that a XJ with a resistor would be getting if it had gone bad. Like exactly the same.
What symptoms? We need DETAILS if we are going to help you.
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Unread 01-25-2011, 04:59 PM   #8
vrodek
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The fuel pump relay is just chattering away very rapidly when it is very cold out and the pump never turns on. And when I try and start it, it just cranks. I've tested all the injectors, fuel pump (and the check valve), distributor, plugs and switched around the relays on the panel.
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Unread 01-25-2011, 05:08 PM   #9
vrodek
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And the only way that I've been able to start it is I put a small space heater directly on top of the computer for about 20 mins and it starts. So I am able to leave my house and go places but I can't get home because it's too cold.
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Unread 01-25-2011, 05:12 PM   #10
tjwalker
It's the crank sensor!
 
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I will say that I have come across your symptoms one other time and that time, it required a swap of the computer.
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Unread 01-25-2011, 05:14 PM   #11
vrodek
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Yep that's what I've been reading. I ordered a refurbished one which should be here in a couple days. Is it as simple as taking the old one out and putting the new one in? Or does the dealership have to do something?
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Unread 01-25-2011, 05:51 PM   #12
tjwalker
It's the crank sensor!
 
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If you ordered one on-line, it should be ready to install and should be from the same year of your XJ. No flashing required at dealer.

Be sure to let us know if the new computer takes care of this..........
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Unread 01-25-2011, 06:17 PM   #13
vrodek
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Yeah I specifically chose one for a 95. It however did not say that it was ready to install. Should I call them and ask or get some info from a dealer?
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Unread 01-25-2011, 06:39 PM   #14
scott_jeep
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Quote:
Originally Posted by vrodek View Post
And the only way that I've been able to start it is I put a small space heater directly on top of the computer for about 20 mins and it starts. So I am able to leave my house and go places but I can't get home because it's too cold.
I feel your pain. I've never had it happen to a car but my old Apple PowerMac G5 used to require the same setup. Had to put a space heater on it for about 30 minutes whenever outside temp dropped below 40. Even if the office was set to 80 it somehow knew. So annoying have to come in 30 minutes early every day to warm up the computer.
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Unread 01-25-2011, 06:46 PM   #15
vrodek
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I can't think of a worse inconvenience lol.
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