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Old 07-13-2012, 06:57 PM   #1
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Exclamation 1990 Wrangler 6 cyl HELP!!!!

A buddy of mine brought me his 1990 Jeep Wrangler 6 cyl saying when shifting from
1st to 2nd, it would "stumble and cut out." The Jeep sat for about a year in a barn. I said I would look at it for him. We decided it needed a tune up. He ran 3 tanks of premium with injector cleaner, helped a little.

Today, I "rebuilt" the carb(Carter 2bbl), replaced fuel filter and fuel lines, Replaced cap, plugs, and rotor. Fixed the "stumble" from 1st to 2nd. BUT, now when it hits around 40 mph, it seems to cut out rapidly, like it's not getting fuel or air in the fuel. Replaced the vacuum line for the vac advanceand checked the vac advance itself. Vac advance checks good.

Sooooo, what could be causing this? Timing, carb adjustment, ???? It's not rpm specific, just speed specific. This has me confused as hell and I really need to get this fixed.

PLEASE HELP!!!

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Old 07-13-2012, 09:32 PM   #2
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I wonder if it is load specific. I would check the timing and make sure that it is set correctly, if you are too advanced it can cause this issue.

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Old 07-14-2012, 11:02 AM   #3
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I wonder if it is load specific. I would check the timing and make sure that it is set correctly, if you are too advanced it can cause this issue.
Gonna try that. I found another thread here that sounds alot like what I'm experiencing and adjusting the timing seemed to fix it. Thanks for the help.
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Old 07-14-2012, 11:53 AM   #4
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When you did the carb rebuild did you clean the pick up tube things.. look like fangs? assuming the Yj carb is like the old cj carter... those holes get clogged and can be an issue...
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Old 07-14-2012, 03:22 PM   #5
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Yeah, cleaned the metering rods, replaced accelerator pump, ect...gonna try the timing thing, if that doesn't do it, gonna take the carb back off.
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Old 07-14-2012, 03:31 PM   #6
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Yeah, cleaned the metering rods, replaced accelerator pump, ect...gonna try the timing thing, if that doesn't do it, gonna take the carb back off.
If that doesn't do it sounds like a rebuild is in order.
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Old 07-14-2012, 04:52 PM   #7
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If that doesn't do it sounds like a rebuild is in order.
That's what I'm afraid of. Unfortunately, nobody around here carries the complete rebuild kit for this thing. Only the basic kit(just gaskets and accelerator pump).
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Old 07-15-2012, 04:19 AM   #8
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Spent the day working on the Jeep. Adjusted timing and test driving. No dice. Every timing adjustment I made only made things worse, and I actually got stranded when the Jeep died and wouldn't start. Called a buddy who came and picked up my wife and took her to my house to get my truck. I kept messing with it and finally got it to start(still running like crap). Got it home and reset the timing to 16*. Took it for a test drive, still same problem. Runs great until 40 mph and then falls on its face like it's running out of gas, bucking and jerking. If I upshift while it's doing this, it stops and runs fine. Sooo, I'm guessing it's a fuel problem? Plan is to replace fuel pump and do a complete rebuild on the carb. Any other suggestions?
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Old 07-15-2012, 04:20 AM   #9
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Tps
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Old 07-15-2012, 04:25 AM   #10
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Throttle Position Sensor?
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Old 07-15-2012, 04:28 AM   #11
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Throttle Position Sensor?
Yes that's TPS
It's a cheap easy thing to fix. I did it myself on mine
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Old 07-15-2012, 04:33 AM   #12
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OK. Now the question is, is that a dealer only item or will NAPA or Autozone carry it?
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Old 07-15-2012, 04:37 AM   #13
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Originally Posted by 03 tx pwr stroke
OK. Now the question is, is that a dealer only item or will NAPA or Autozone carry it?
U can get if from dealer or auto zone. I got if from auto zone for $35 and took like 5 min to replace
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Old 07-15-2012, 04:43 AM   #14
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Awesome. But, would that cause this problem only at 40 mph? It doesn't do it in 1st or 2nd no matter how hard I accelerate, only at 35-40 mph.
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Old 07-15-2012, 04:48 AM   #15
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I'm no mechanic but my YJ would "hiccup" and stuff and that fixed it
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Old 07-15-2012, 04:59 AM   #16
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OK, I'll try that. I really appreciate the help, man.
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Old 07-15-2012, 05:09 AM   #17
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OK, I'll try that. I really appreciate the help, man.
Ur welcome girl, anytime sister
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Old 07-15-2012, 08:29 AM   #18
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Does a carbed YJ even have a TPS? I dunno I have a Weber on mine but I thought that was a FI thing.
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Old 07-15-2012, 01:35 PM   #19
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Does a carbed YJ even have a TPS? I dunno I have a Weber on mine but I thought that was a FI thing.
Ooooh THAT i don't know. But I'm sure if he goes and asks for the TPS they can tell him there if it uses one or not, their system will tell them

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