YJ 4cy Engine Question - JeepForum.com
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post #1 of 6 Old 06-06-2013, 12:44 PM Thread Starter
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YJ 4cy Engine Question

Just got a 95 wrangler the other day, drove fine. After I drove it about a day I noticed it would sputter some times like it was about to die then surge back The other day I was driving and it kept dying on me but would start right back up. Any idea what could be causing this? I was thinking of replacing the fuel filter and fuel pump to see if that did the trick.

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post #2 of 6 Old 06-06-2013, 01:20 PM
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Fuel filter is good to replace since you dont know when it was last. I wouldnt jump to the fuel pump yet. This sounds like a CPS going out on you. There is a test procedure if I remember correctly but I dont remember it. I am sure Que will be along shortly. Listen to him trust me on this you will save alot of money and headaches and potentially learn ALOT.

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post #3 of 6 Old 06-06-2013, 02:13 PM
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I would also inspect your ignition system (plugs, wires, cap, rotor, coil) and make sure they all look good. And maybe run some injector cleaner to make sure they are spraying correctly.
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post #4 of 6 Old 06-06-2013, 07:29 PM
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You should check to see if you have any engine codes. There's a "how to" in the FAQ's section.

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post #5 of 6 Old 06-17-2013, 11:15 AM Thread Starter
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replaced fuel filter no go, will be buying a crank sensor today to see if that works from what i have read it could be the issue
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post #6 of 6 Old 06-17-2013, 12:01 PM
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I strongly suggest troubleshooting this issue before throwing parts at the rig. Have you at least checked for codes as previously mentioned? If no codes, then test fuel pressure at the fuel rail. You can rent testers at most auto part stores. Check your fuel pressure while idling, then remove the vac line on the fuel pressure regulator and note the pressure change. Then shut it down and watch how quickly pressure bleeds of if at all. The problem with replacing parts willy-nilly is that there is a strong potential of installing a bad part in place of an otherwise good one. This costs more money and further complicates the actual fix.
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