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Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
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post #1 of (permalink) Old 11-13-2007, 11:14 AM Thread Starter
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still stumbling

Hi

So I have an 82 CJ7 with a 258 out of a '73 Jeepster.

I've been having problems with keeping it running...I've posted before...

It feels as though it's not getting enough gas...though I'm not sure that's the problem as when I turn it over I get plenty of gas dumping into a plastic jug.

Occasionally when it feels like it's going to cut out...I can push in the clutch to keep it going and slowly let the clutch out and go for a little longer...I'm generally not getting out of 1st gear...never getting into 3rd gear...

It got to a point where I couldn't even start it...

I replaced the fuel filter and ignition module. It now starts and runs...though it still stumbles...again feeling like it's not getting enough fuel. It does this when it's cold. I had a similar problem in the summer...though it only happened when it was warm...

It looks as though it gets plenty of spark when I pull the wire off the coil, stick a screw driver in it and lay it across the valve cover...I did the TFI upgrade this past spring...

Could this be a grounding issue?

Any thoughts as to where to look next or how to relook at something I already looked at or any info you need to help me out?

Thanks!
Patrick

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post #2 of (permalink) Old 11-13-2007, 11:43 AM
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Have you tried replacing the fuel pump?

It's possible that it's functioning at low RPMs, but not functioning as well as it should at high RPMS. Plus, a fuel pump on a 258 should be a cheap and easy check.
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post #3 of (permalink) Old 11-13-2007, 11:55 AM
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So your saying that it's really bad when cold but once it warms up it runs ok?

Under the carb on the intake manifold is a heater. This heater warms up the fuel mixture until the engine warms up enough to push that hot water through the intake. If the heater is bad or the relay that feeds it (mounted on the firewall to the right of the MC), it runs like crap....You can confirm your getting power to it when cold by measuring the voltage on that big red wire that attaches to something under the intake (the heater).

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post #4 of (permalink) Old 11-13-2007, 11:59 AM
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I'm surprised!
You've been on this board for a long time - and you don't remember the easiest way to determine whether you have a fuel problem or it's something else - like ignition, timing, or even mechanical?

It not only will help you decide if it's a lack of fuel, among other things, it'll help determine whether the mixture is right or not - at all speeds.

I'm sure you've seen me suggest it to others lots of times, and seen their feedback about how quick and easy it was. Even magazines are quoting my article.

But maybe it's the small cost ($8-10) of making the tool is too insignificant to buying lots of parts to throw at it playing "hit or miss?"
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post #5 of (permalink) Old 11-13-2007, 12:08 PM Thread Starter
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RRich...you're talking propane correct? I just always forget...I'm such a moron.

JeepDawg...I've haven't been able to get it to get warm lately...

Additonal info...new Centec wiring and MC2100 carb...

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post #6 of (permalink) Old 11-13-2007, 12:19 PM
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Yes - "propane trick" - read the entire article.

It's not magic, and it doesn't always help find the solution - but it sure helps tell you what it ISN'T!

A big part of diagnosis is simply eliminating things that are NOT the cause.
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post #7 of (permalink) Old 11-13-2007, 12:26 PM Thread Starter
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Where can I find the article again?

Search on the board?

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post #8 of (permalink) Old 11-13-2007, 12:28 PM
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Search on here - "Propane Trick"
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