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atvboo
03-22-2011, 05:41 PM
I have a 97 tj 4.0 engine misses and throwing a #2 cylinder missfire, random miss fire and crank position code. Anyone ever have a miss fire from the cps being bad . I swapped injectors and the miss fire stayed with #2 .I have good plugs wires and cap rotor.

limegreentj
03-22-2011, 08:46 PM
yes a bad cps will cause a mis fire. happened on my project i'm parting out

atvboo
03-22-2011, 09:54 PM
Thanks was doin some research and goin to buy 1 tomorrow just thought they normally quit instead of missing just wanted someother opinions or experiences.

limegreentj
03-22-2011, 10:00 PM
also, if you look on amazon you can get them around 20 bucks....

i paid 25 for one for my tj...instead of 60 from advance

atvboo
03-24-2011, 06:11 PM
Well wasn't the cps back to the drawing board.

atvboo
03-27-2011, 03:04 PM
Ok I have a collapsed lifter. I found another motor for free but goin to rebuild this one I might stroke thus one and if not has anyone ever put a different cam in. Looking for some more horse power and for some suggestions please. Also might be looking for a crank if I do the stroker.

moparfan01
03-31-2011, 04:49 PM
I put a custom grind from comp cams in my zj. Also a few other upgrades but the cam made a crazy difference the only down fall is I think I need a tuner now to adjust the timing .... had to cut an ear off the distributor hold down to get it to run right....

Christopher
04-01-2011, 12:01 AM
A friend of mine has a 4.2 he would part with if you want a stroker

atvboo
04-01-2011, 04:44 AM
I was reading the a adjustable fuel regulator might be needed with a different cam you might what to read up on that. And as for the stroker still not sure if I want to put the money into one yet read tomany people don't think they are worth it. Pm me a price though after this motor I am goin to build another for my big jeep and might stroke that one.

atvboo
04-08-2011, 09:16 PM
i decided to fix the lifter just changed it today .3hours done it runs yea . man im tired of working on this thing .still goin to rebuild a motor later low oil pressure and a main seal leak but it runs .

atvboo
04-13-2011, 10:21 AM
This thing really don't like me. Drove to Lowes today and started poppin and stalls at idle. If I run above 3000 rpm it runs decent but not great leave off the throttle and it stalls, under 3000 and it misses and pops or backfires not sure which when I restart it I have to hold the throttle 3/4 open to get it to fire up. Did some research I have no codes and they are sayin maybe the water temp sensor. My question is before I buy one has anyone ever have this happen to them?

limegreentj
04-13-2011, 10:26 AM
could be a TPS or MAP sensor also.

atvboo
04-13-2011, 12:17 PM
Will they throw codes?

atvboo
04-22-2011, 08:22 PM
This tj is pissin me off I changed the iac yesterday and didn't help been reading it might be the coolant temp sensor. As soon as I hit the throttle it misses worse and backfires. Anyone have any ideas im startin to go crazy

atvboo
04-23-2011, 07:40 PM
Wasn't the temp sensor. Its reading fine. Goin to Ck the map and throttle. Position sensor next

atvboo
04-25-2011, 08:23 AM
Found my problem I broke valve spring .I hope to fix it today but this thing just don't like me.

atvboo
04-25-2011, 10:44 AM
Fixed runs good so far. Atleast fir 2 days that is all I get