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Unread 02-13-2003, 11:33 AM   #1
GREGDOG95YJ
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Join Date: Jul 2001
Location: BIRMINGHAM, ALABAMA
Posts: 270
performance ignition systems?

I have a 4 banger in my jeep. I was averaging 19-21 mpg and it dropped to around 15-16 and started running rough so I replaced the O2 sensor and the plugs, wires, cap and rotor. the motor started running better but the mileage is still around 17. with gas prices climbing I am trying to figure out the problem. and I'm looking for suggestions.

Could it be:
1) the map sensor
2) the clogged cat
3) the TPS sensor
4) the fuel pressure regulator
5) a bad distributor
6)EGR valve
7) crank postion sensor
8) bad coil
9)IAC valve

also I have thought about getting a after market distributor and/or ignition system what would you guys recommend.

1) jacobs
2) MSD
3) mallory
4) HEI (if available)
5) Accel
6) DUI (Davis United Ignitions)


TIA

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Jason Gregory
95 yj Rio Grande 2.5L
31" BFG MUDS, 1"BL,2" homemade spring lift, 150W KC'S, KN Filter, both air restricters gone, track bars gone, quick discos, & high flow cat

"just like all addicts my need to satisfy my addiction far exceeds my wallet!!"
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Unread 02-14-2003, 08:28 AM   #2
wildvan
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Join Date: Dec 2002
Location: San Diego, Ca.
Posts: 47
I dont have a good answer your question on the ignition, I am reserching them also, as for the mileage. Did any one thing start making it run bad, if it was running real rich, then you may have plugged up your cat, I have never heard of a coil going bad and still working, if the jeep runs, your coil most likely is working. Are you getting any check engine lights? Have you checked the codes??
You nned to do that, most of the time if your sensors start going, they will trigger a light.
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Unread 02-17-2003, 12:53 PM   #3
GREGDOG95YJ
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Join Date: Jul 2001
Location: BIRMINGHAM, ALABAMA
Posts: 270
The check engine light is not on or coming on there are no codes stored in the computer. and the cat is only a year old. thats why I'm stumped.
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Jason Gregory
95 yj Rio Grande 2.5L
31" BFG MUDS, 1"BL,2" homemade spring lift, 150W KC'S, KN Filter, both air restricters gone, track bars gone, quick discos, & high flow cat

"just like all addicts my need to satisfy my addiction far exceeds my wallet!!"
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Unread 02-17-2003, 07:40 PM   #4
wrangler john
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Join Date: Feb 2003
Location: Delaware
Posts: 30
I need more information.....what year wrangler?? Have you checked your ignition timing? checked compression of all 4 cylinders? Had you changed anything prior to this happening?
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Unread 02-18-2003, 08:22 AM   #5
GREGDOG95YJ
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Join Date: Jul 2001
Location: BIRMINGHAM, ALABAMA
Posts: 270
I checked the timing and it was at 12 degrees over. I have a 95 yj with a 4 cyl like it says in my sig. I have been trying to find a friend that has a compression tester so I can test compression. I had not changed anything I had been running the same setup for over a year when it suddenly changed and I have been chasing the problem ever since.
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Jason Gregory
95 yj Rio Grande 2.5L
31" BFG MUDS, 1"BL,2" homemade spring lift, 150W KC'S, KN Filter, both air restricters gone, track bars gone, quick discos, & high flow cat

"just like all addicts my need to satisfy my addiction far exceeds my wallet!!"

Last edited by GREGDOG95YJ; 02-18-2003 at 08:25 AM..
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