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Author Topic: 89 YJ starts then dies?  (Read 735 times)

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Guardian7

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89 YJ starts then dies?
« on: January 22, 2010, 03:31:32 PM »
I sold my 89 YJ 4banger to a friend who is now having problems, it starts but just dies, it won't stay running, does anyone have possible cause's or fixes? I suspect it's a fuel problem and we'll try changing the fuel filter this weekend. I would like to do some fuel pump tests but don't have any info on the 89 TBI fuel system. Does anyone know what the fuel pressure should be?
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Offline chardrc

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Re: 89 YJ starts then dies?
« Reply #1 on: January 22, 2010, 03:55:39 PM »
tbi needs 14.5 psi at the injector (according to pdf manual) i think the pump is supposed to supply around 17psi.. this pdf has most testing procedures and good amount of info about the tbi system...

 http://jeepgarage.free.fr/OWN/fuel%20injection%20system%20tbi.pdf
« Last Edit: January 22, 2010, 04:14:45 PM by chardrc »
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1990 YJ 4cly, ax5, 2.5 inch BDS lift, 31 MTr\'s,  Powertrax-lockers all around, track-bars removed, boomerang shackles, warn m8000 winch, electric fan. [sold but not forgotten]

2007 jk Rubicon 2dr

bluebomber

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Re: 89 YJ starts then dies?
« Reply #2 on: January 23, 2010, 04:04:49 PM »
Is it erratic idling before it dies or does it idle fine and just shut off?  Does it increase in RPM, goes from let's say 1000 RPM to 3,000 RPM, when you start it then dies?  Is it automatic or manual transmission?
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