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06-19-2007, 03:40 PM
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94 YJ hard starting problem.
I have a 95 yj with a 4.0 and a friend of mine has a 94 with a 4.0. When you start mine it will fire off almost instantly. On my buddy's his has to crank over for 4-6 seconds before it will start. We put a gauge on the fuel rail and it has 38 psi but it bleeds down to under 30 in about 3-4 minutes. Any suggestions on where to look for his slow starting problem?
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06-19-2007, 05:58 PM
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Re: 94 YJ hard starting problem.
Seems the fuel pressure is the issue; it could be either the Fuel Pressure Regulator or the Fuel Pump that is leaking...
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 '94 YJ 2.5L, RE 4" Std Lift, Adv. Ad. SYE, Woods Shaft, 62mm TB and TB Spacer, 165A Alternator, Aluminum Rad, BRX Hoses, Taurus e-fan, Delta Control fan controller, K&N Filter, Gibson Cat-Back, Accell Coil, LiveWires, 19# injectors, 31" Dueler H/T on AR 15" Outlaw II Wheels, Delta Xenon H4 Headlights, 100W KC Daylighters and 100W Slimlites (Fog), Riptech Wiperboy, Sony sound system (5.25" front, 6X9 rear and 12" SW with amp), Pavement Ends Targa Hard Top or Best Top Soft Top.
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07-19-2007, 09:15 AM
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Re: 94 YJ hard starting problem.
The is typical of some 4.0's. I don't know what the real issue is, but if you think it is the fuel pressure then turn the switch to "on" listen for the fuel pump to come on and build pressure. When it hits pressure it shuts off, as soon as it does, try to crank it. If it still takes the same 4-6 seconds to start then it's not the fuel pressure.
I would start with changing the plugs and giving it a tune up.
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Safety yellow and Handicap blue CJ with 5.3 Vortec/TH400/Tons/Atlas/Roks/Locks and Airshocks. 1622 Miles from Moab.
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07-20-2007, 10:54 AM
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Re: 94 YJ hard starting problem.
My 2.5L does the same thing and the long cranktime is common. I'm also looking for an answer for this.
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07-20-2007, 06:04 PM
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Re: 94 YJ hard starting problem.
pressure leaking by the o rings on fuel injectors...common in wj's, too. it should hold pressure for 30 mins or so, i think chrysler says.
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wicked good dude
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