1slo_camaro

i swapped a motor into my 98 zj and got it to run but it really really really really ran like crap!!!! misfiring, backfiring loading up. just everything wrong with it.

Im used to old SBC/BBC motors, are they the same when setting the dist? where you set cylinder #1 on top dead center on the compression stroke and then install the distributor and set your plugs/ wires that way??? i thought i had it 180 degrees off so i tried that and now i am going back tomorrow morning and starting all over again, just wanted to check with someone and see if anybody else has had these issues? or if i am completely wrong and should be setting the dist a different way.


Any help would be great. we are just going off knowledge of setting everything, but so far this jeep has proven all theories and thoughts to be completely wrong!

freegdr

Since timing computer controled rotor actusly goe in clockwise past no 1 on cap.

1slo_camaro

so itll appear as though its ahead of no 1?

freegdr

yep

1slo_camaro

ok perfect i think i found my problem. i would say im a solid 1 tooth off, so i guess ill head out and start over again and just have to turn the oil pump by hand to get it lined up. i believe it was either right in line with no 1 or slightly behind it when i put it in the first time so like i said id assume that is why it ran but very very crappy...


THankyou i will post up in the AM how it works unless i get a bug up my *** shortly and go tinker on her now

1slo_camaro

just got her fired up and shes VERY smooth, a few pops here and there and idling at 3k but i have a few known vaccuum leaks, but sounds a MILLION times better then last time so that makes me happy! i cant wait til tomorrow to button up a few things and see if i can get her back on the road, shes been down since Dec 19th......

freegdr

bug gottcha hugh ...lol...

freegdr

http://www.angelfire.com/my/fan/dist_index.html

1slo_camaro

hahaha thanks man, ill probably go out tomorrow and check it over again with the day light, but i feel a bunch better knowing this motor is good good oil psi and not knocks, i was worried because i never heard it run before. but my other motor wouldnt start. i had spark and i had fuel but couldnt figure out what was wrong. nothing was broke. timing marks still on point and everything so im happy shes running i just need to get the idle down....

freegdr

kool

1slo_camaro

Is there a difference from a 93/94 4.0 to a 98 4.0. I know the flywheels are different, I ran into the issue with the bolt holes and only having 3 of them line up.... but right now my jeep is throwing a P1391 code and everything seems to be fine. sensors are tight and they were perfectly fine before i did the swap and didnt get damaged. The crank position sensor on the bellhousing is maybe 10k miles old so i am kinda ruling that out. The cam sensor..... i havent replaced that since i have had it....

So my question is, Is the intermittent Crank/Cam Signal loss a result of the rings on the flywheel being different? is that a possibility?


Can anyone help? again i know the flywheels are different but what about the crank trigger ring?

SeriousOffroad

Answered in your other thread.