4.0 cranks and will sometimes wont start - JeepForum.com
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post #1 of 2 Old 02-06-2010, 05:21 PM Thread Starter
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4.0 cranks and will sometimes wont start

Hello I have a 1991 yj that i put a new motor in. The motor has 6500 miles on it. It ran great till i parked it to drive my truck. Now it is really hard to start when it does start it idles great but when you get up to 35-50mph it starts to sputter and back fire. Today i replaced the fuel filter and cap and rotor. that did nothing for my issue, i also took off the cat and that made it worse. Sometimes you have to turn the key on and off about 5-7 times to get it to start. I am now thinking that it is the fuel pump. Can anyone give me some advice what they think it is.

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post #2 of 2 Old 02-06-2010, 11:49 PM
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TPS or IAC. Maybe even the CPS. Look em up, these could be causin your troubles.

I don't blame people for their mistakes, but I do expect they pay for them.

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