loss of power uphill/acceleration - JeepForum.com
 
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post #1 of 11 Old 08-04-2010, 11:03 PM Thread Starter
cryptostorm
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loss of power uphill/acceleration

I drive a hour to and from work each day.. 2 days ago i got about 6 miles from work and it started spitting and sputtering going uphill and during acceleration. i ended up going about 45mph on the highway.. but i did get to work..

On my lunch break i replaced my fuel filter and put in some injector cleaner..

It ran fine on the way home, and back to work the next day. However tonight on the way home it did it again about 15 miles from home..

I'm split 50/50 between my ignition coil and my fuel pump...

I'm kinda leaning toward the ignition coil because if it starts sputtering and i floor it (which makes it bog down more), i can smell unburned fuel (as i have the top off)..

just wondering what you guys think..

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post #2 of 11 Old 08-05-2010, 08:18 AM
MAMMOTH
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If you have an 89 with a 4.2 then you should be carbureted and not fuel injected.
Post this in the YJ tech forum for better results (youre in the TJ forum)

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post #3 of 11 Old 08-05-2010, 10:02 AM Thread Starter
cryptostorm
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its a 89 body but the engine is from a 97.. i replaced the coil, cap, rotor, wires and plugs this morning..
We'll see how it goes..
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post #4 of 11 Old 08-05-2010, 02:27 PM
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The 4.2 in your profile threw me for a minute.
4.0's replaced the 4.2 in 1991.
Hope it fixes it for ya.

2004 TJ Rubicon - 3" lift, 1" BL, UCF tummy tuck, Savvy control arms, JKS track bar, Brown Dog MML with Super brackets, 35ís, M8274, VanCo BBK - (Thanks MisfitSeven), IronRock tierod, Ten Factory shafts.
1999 XJ - DD with 228k
1998 TJ - shell waiting for engine, trans, tons.....
1997 XJ - more rust than Jeep, but it runs.
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post #5 of 11 Old 08-05-2010, 02:36 PM
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I had a very similar problem in my VW just recently. It ended up being a burn out catalytic converter. When I punched it up the hill or to get onto the highway, it would bog down and act as if it was running on half the cylinders. When I pulled the old cat off, there was a section of the honeycomb inside that was just rolling around like a baseball. You could check there.

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post #6 of 11 Old 08-05-2010, 03:12 PM Thread Starter
cryptostorm
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Actually its kinda acting like im using the jake break on a diesel engine.. if you know what thats like, or at least what im talking about... its even sounds like im using a jake break (louder throaty exhaust)..

that didnt fix it... it happened again on the way to work today.. about 5 miles from work.. although this time it eventually shut off.. i got it started again and got to work a little late..

cant be the cat as there isnt one..

are we in agreement that only thing really left is my fuel pump??.. or some odd electrical problem.. i cant really think of anything else..
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post #7 of 11 Old 08-05-2010, 03:20 PM
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crank position sensor? throttle position sensor?


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post #8 of 11 Old 08-05-2010, 03:22 PM
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What plugs did you use?When is the last time you cleaned your throttle body?and redid your profile properly?

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post #9 of 11 Old 08-05-2010, 04:33 PM Thread Starter
cryptostorm
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Tps is good, throttle clean..

new development/question.. the fuel pressure regulator dictates the pressure of the fuel system by relieving the fuel rail of excess pressure...

how much fuel should be running out of the fuel return line when the jeep is at idle? mine is pouring.. i unplugged the relief line and put a cup under it and got about 8oz of fuel letting it idle for about 2 seconds...
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post #10 of 11 Old 08-09-2010, 05:40 AM Thread Starter
cryptostorm
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ok.. Its not the fuel pump, or the regulator...

The only sensor i can find that resembles a crank position sensor is attached to my bell housing... is that where it is?

do jeeps have any ignition switch related problems?

profile updated btw..

Last edited by cryptostorm; 08-09-2010 at 05:51 AM.
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post #11 of 11 Old 08-10-2010, 10:14 AM Thread Starter
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