Anybody cammed the 4.0? Change the ignition/fuel maps? Tune on the dyno? - JeepForum.com
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post #1 of 6 Old 12-26-2017, 01:22 PM Thread Starter
heepzeegay
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Anybody cammed the 4.0? Change the ignition/fuel maps? Tune on the dyno?

I have had jeeps for a while but this is the first one I have had that is altered from stock a little bit. I got .060" oversized pistons and a comp "extreme 4x4" cam in my build. Had it going for a while but I get hesitation/pings/misfires down low. Anybody have any experience with tuning/chips for changing fuel maps. I am assuming somebody has built a stroker 4.7 here that needed a tune. I was wondering if anybody has had experience using hypertech, jet, etc...to change their tune.

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post #2 of 6 Old 12-26-2017, 02:28 PM
biffgnar
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I believe for most 90s and even early 2000s, DC programming has not been cracked very well and most people use piggybacks.
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post #3 of 6 Old 12-26-2017, 06:22 PM
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What year? What intake you running? Without head work, might be wasting time. Possibly injectors could help, if they can be tuned that is. But with pings misfires at low rpm. Might be a timing issue/possible fuel. What's your timing set at?

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post #4 of 6 Old 12-28-2017, 11:44 AM Thread Starter
heepzeegay
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As far as I know, running stock timing. I set the dizzy like I would have on my other 4.0's. The timing chain was set by the engine builder/machinist. Stock 96 ZJ intake manifold. The cam is not supposed to be super aggressive so I don't neeed head work like a port and polish but I did have the valve train done as well as the lifters.

Last edited by heepzeegay; 12-28-2017 at 11:48 AM. Reason: addition
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post #5 of 6 Old 12-29-2017, 04:53 PM
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Try giving it two degrees advanced for up to 12. Go in 2 degree increments.. See if it helps any.

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post #6 of 6 Old 12-31-2017, 02:48 PM Thread Starter
heepzeegay
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I wish it was that easy. The timing is really only adjustable ~28 degree increments due to the 13 teeth on the distributor gear. The thing locks in only one way. Computer is responsible for timing ignition according to cam/crank sensors. I'm waiting for a day above 5 degrees to get back out there.
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