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Old 04-17-2011, 04:23 PM   #1
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Jeep Trouble

So just like last year (click here), we have a 1990 YJ with a 4.0L that we built up and entered in a local parade. (no pics yet for this year)

The Jeep pulled everything fine, but gave out 3/4 the way thru the parade route. I'm trying to figure why.

At first the driver and co-pilot thought maybe the fuel pump gave out or maybe it had run out of gas. A few hours later I got to it, cranked it up, and let it idle for 65 minutes...that wasn't the problem.

Maybe it overheated...again, it ran fine during the 65 minutes. The (upgraded) electric fan cut on and off like it should and the additional supplemented fan we added kept the temp right at 210 like it should. Don't think it overheated.

However...

My current thought is that maybe the battery temperature sensor tripped. Does anybody know what happens when that goes off?

And no, I've not been able to get the OBD codes...the on, off, on, off, on sequence doesn't give any results.

I'm looking for opinions, suggestions, questions, etc. Even though it is impossible to recreate the scenario, I've gotta figure out what the problem was so I can fix it for next year's float...

Ask away...

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Old 04-18-2011, 04:59 PM   #2
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Nobody?

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Old 04-20-2011, 08:28 AM   #3
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Wow...
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Old 04-20-2011, 08:51 AM   #4
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I'll see what I can find, but I could imagine it got rather hot under the parade stuff and had very limited cooling capabilities.
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Old 04-20-2011, 08:57 AM   #5
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Is very likely the answer and again there is no way to replicate the problem. All I know is that the temp on the radiator stayed around 210-220. We had added fans with fresh air duct worked in to help.

I'm actually wishing it were a simple answer like having the fuel pump go out...at least THAT would be an easier fix.
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Old 04-20-2011, 09:03 AM   #6
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Alright, so I'm assuming this was an engine swap Jeep as 4.0 wasn't available in 90. So what year wiring harness and engine did you use, also what have you done to the engine. The more information we know about the jeep, the easier it is to diagnose it. And there are plenty of sensors under the hood (and the computer?), even though the radiator is being cooled enough to keep the jeep running at temp, all of that hot air is being blown into the engine bay, and unless it's venting, all of the electronics and sensors could easily have been overheated.
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Old 04-20-2011, 09:15 AM   #7
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Hmmm...good question.

Ok, maybe not the 4.0 specifically... it is a straight 6. Engine is stock from what I can tell. Only mod looks to be the addition of a Flex-a-lite fan. Doubtful that any other engine mods were done.

Interesting thing is that the jeep pulled a good 2000 lbs more last year with zero problems and no fresh air intake on the fans.
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Old 04-20-2011, 09:37 AM   #8
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Okay, you have the 4.2, which is Carb'd. That makes a HUGE difference than the 4.0 which is fuel injected. You might have vapor locked the motor underneath the float. What was the temperature outside? Sorry, I don't know your location so it's hard to guess.
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Old 04-20-2011, 09:40 AM   #9
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We're over in San Antonio. I believe it was a high of 87 out that day.
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Old 04-20-2011, 09:43 AM   #10
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Probably was a heat issue than. I'd imagine there's a ton of insulation on the jeep with the float, I don't know how you had it cooled, but it'd definitely be easy enough to vapor lock it or even overheat the ignition module or something else electrical to keep it from working properly. Maybe someone will chime in and give a hand as well.

PS. That float looked great by the way.

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