This YJ is Driving Me Nuts! - JeepForum.com
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  • 1 Post By UPStrades
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post #1 of 6 Old 07-07-2020, 09:38 PM Thread Starter
MacQ
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1991 YJ Wrangler 
 
Join Date: Mar 2020
Posts: 27
This YJ is Driving Me Nuts!

To recap, the YJ stopped running as it sat idling a couple of months ago. Not a daily driver and son (owns Jeep) and I work on it when we have the time to do so and are not in any great hurry. What we have done so far, in order.
    • New fuel pump
    • New fuel tank skid plate as original was rusting out.
    • Tested coil - good
    • Made sure all grounds were good
    • ECU seems good as the Check Engine Light comes on when key is turned
    • Replaced distributor (wires sending info were damaged...and I haven't messed with a distributor in almost 50 years)
After distributor replacement (this evening), fired up the engine and it ran...for about one minute and then it died. We can get it to fire up but will only run a few seconds.

Suggestions on where to go from here?

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post #2 of 6 Old 07-07-2020, 10:30 PM
UPStrades
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1993 YJ Wrangler 
 
Join Date: Nov 2017
Location: El Paso
Posts: 113
Im sorry but it's hard to figure out where you're at without details. Is this on a fuel injected engine? Auto or manual? If i missed these details im sorry. Are you getting fuel your rails? Im going to go with a fuel issue since it sounds like you're getting spark to start it.

I would just replace the fuel filter since we don't know the details of it. After that check your fuel pressure regulator.
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post #3 of 6 Old 07-07-2020, 11:03 PM Thread Starter
MacQ
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1991 YJ Wrangler 
 
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Posts: 27
Quote:
Originally Posted by UPStrades View Post
Im sorry but it's hard to figure out where you're at without details. Is this on a fuel injected engine? Auto or manual? If i missed these details im sorry. Are you getting fuel your rails? Im going to go with a fuel issue since it sounds like you're getting spark to start it.

I would just replace the fuel filter since we don't know the details of it. After that check your fuel pressure regulator.
UPStrades, yes it is fuel injected. Manual tranny. Yes, getting fuel to the rails. I forgot to mention that we did change the fuel filter. Yep, fuel pressure regulator was on my mind at this point.
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post #4 of 6 Old 07-08-2020, 12:24 AM
UPStrades
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1993 YJ Wrangler 
 
Join Date: Nov 2017
Location: El Paso
Posts: 113
I dont believe you can adjust timing so pull the plugs and check for spark against the engine. Im sure you know that process.

I know it sucks now but after you get it up and running it shouldn't leave you stranded somewhere with no way home. Better it get fixed in the driveway than in a parking lot. I take comfort in knowing my 4.0 is dead on reliable (after replacing everything)
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post #5 of 6 Old 07-08-2020, 04:32 AM
bruinjeeper
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1995 YJ Wrangler 
 
Join Date: Jun 2013
Location: New West
Posts: 8,426
Pinch the fuel return line with a gauge hooked up at the shrader valve on the rail.... fire it up.

See what's what in terms if FPR.

It could also be the check valve at the tank...I forget if that is part of the actual fuel pump or not.

Have you been using a fuel pressure gauge to verify the pressure?
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post #6 of 6 Old 07-08-2020, 04:41 AM
StanF
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1995 YJ Wrangler 
 
Join Date: Feb 2013
Location: Austin
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First, pull the codes:
https://www.quadratec.com/jeep_knowl...article-24.htm
This will take 2 minutes and will likely tell you exactly what is wrong. Could be the Crank sensor, camshaft sensor, coil, etc.

If no codes, then put a fuel pressure gauge on it, check for spark, noid lights, etc.
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