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post #1 of 17 Old 08-13-2013, 04:31 PM Thread Starter
lance89xj
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running rough

so I have been working on my 89 xj for about 2 monthes. I ended up rebuilding the moter and now it runs, but if im not barely on the gas or really getting on it its sputtering and a little backfire everyonce in a while. it don't like driving down the road at a certain speed. I have to be really on the gas or barely touching it. I have replaced the ideal air control valve and the TPS. that helped a little but its still doing it. any ideas???

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post #2 of 17 Old 08-13-2013, 06:15 PM
cruiser54
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How are the 3 ground wires at the dipstick tube stud?

Did you index the distributor?

If you own a Renix Jeep, you'll want to check this out.

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post #3 of 17 Old 08-14-2013, 10:37 PM Thread Starter
lance89xj
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ok yes I made sure it was at TDC befor I put the head back on and stabbed the dizzy to face #1 plug wire. I just got done cleaning the ground wires on the dip stick stud and the main ground on the fire wall. its running the same. just so u know I have replaced the camshaft, lifters, push rods, rocker arms, oil pump, ignition coil, ICM, dizzy, cap, rotor, plugs, wires, CPS, fuel pump, fuel filter, and all fluids and all filters. im so lost in what to do now.....
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post #4 of 17 Old 08-15-2013, 05:23 AM
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What kind of shape is that vacuum line from the throttle body to MAP sensor on the firewall in?

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post #5 of 17 Old 08-16-2013, 01:08 PM Thread Starter
lance89xj
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when I did the motor rebuild I had some broken vaccume lines so I bought a whole new setup
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post #6 of 17 Old 08-16-2013, 03:55 PM
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check fuel pressure to make sure you didnt get a bad pump

1996 Jeep Cherokee- Project-- Rusty's 8in long arm, SYE kit, Teraflex driveshaft, Cragar soft 8's 15x10 with 33x12.5 Firestone Destination MT's, Eaton Tru Trac in the front
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post #7 of 17 Old 08-18-2013, 04:05 AM Thread Starter
lance89xj
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I tested the fuel pressure today and it was around 45-47. that's not it any other ideas. I also changed my spark plugs again yesterday and no change
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post #8 of 17 Old 08-18-2013, 05:24 AM
xjman242
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Stock cam specs?
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post #9 of 17 Old 08-18-2013, 06:26 AM
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Quote:
Originally Posted by lance89xj View Post
I tested the fuel pressure today and it was around 45-47. that's not it any other ideas. I also changed my spark plugs again yesterday and no change
Only supposed to be 39 psi. High fuel pressure causes rich running.

The vacuum line from the throttle body to MAP isn't available anymore. Sure you replaced it?

If you own a Renix Jeep, you'll want to check this out.

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post #10 of 17 Old 08-18-2013, 03:55 PM Thread Starter
lance89xj
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I pulled it off and I could blow trough it so its fine. I cheaked it again today. that fuel pressure was while it was running. I replaced the o2 sensor just now and no difference. it was broken so I thought it would help. just waisted another $64. I need to have this fixed asap
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post #11 of 17 Old 08-18-2013, 05:47 PM
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Quote:
Originally Posted by lance89xj View Post
I pulled it off and I could blow trough it so its fine. I cheaked it again today. that fuel pressure was while it was running. I replaced the o2 sensor just now and no difference. it was broken so I thought it would help. just waisted another $64. I need to have this fixed asap
I'm more concerned that the tube is leaking vacuum.

and, that fuel pressure is too high when running!!

If you own a Renix Jeep, you'll want to check this out.

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post #12 of 17 Old 08-19-2013, 03:21 AM Thread Starter
lance89xj
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I just replaced the egr valve and still nothing. idk what to do now. I need this fixed soon
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post #13 of 17 Old 08-19-2013, 05:26 AM
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Quote:
Originally Posted by lance89xj View Post
I just replaced the egr valve and still nothing. idk what to do now. I need this fixed soon

Your fuel pressure is way too high. 31 at idle with vacuum hose connected to fuel pressure regulator and 39 psi when the vacuum hose is disconnected.

If you own a Renix Jeep, you'll want to check this out.

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post #14 of 17 Old 08-23-2013, 11:54 AM Thread Starter
lance89xj
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so how do I fix that? replace the fuel regulator?
also I believe my timming is off cause I get the ocational backfire
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post #15 of 17 Old 08-23-2013, 02:50 PM
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Timing is not adjustable.

Quite possibly your fuel pressure regulator has failed, or your fuel return line is kinked/crushed.

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

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My Jeep Technical Photos

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