Jeep lost its power

[Ktmracer419]

here is the deal. I got too used to my 4 cyl comanche. Now that i threw 33's on my stock geared 4.0 auto 99, it has WAY more power than my 5.38 geared 96 on 35's

something is not right here.

its a 96 4.0 aw4

the power only kicks in around 4250 rpms and even then it isn't too impressive. other than that it just kinda lugs along. I can still get it up to highway speeds no problem and cruise along just fine.

new parts:
plugs
wires
cap
rotor
cps
o2
air filter
fuel filter
alternator
battree

tps,map, and iac are all good

Hooked it up to the scanner and everything looks fine, no codes.

Not sure where to go from here.
any ideas?

[xjeeper]

[clean4drxj]

comrpession test... hows the airfilter? it this motor stock?

[Ktmracer419]

comrpession test... hows the airfilter? it this motor stock?

maybe monday

new

yes

[CumminsJeep]

If everything you say is good, I would def check the motor out and do a compression test. notice any excess oil or coolant usage? maybe cracked the head or bad head gasket.

[Ktmracer419]

OKAY

narrowed down my issue here

fuel pressure is at 38 running

stock calls for 49 + or - 5 psi

so its a fuel delivery issue

is it safe to say it's my fuel pump or are there a couple more things i could be checking

can't be the regulator as that would give me too much pressure correct?

[HeavyMetal]

isnt this like fuel pump #142? whats the deal with that shiat if thats the issue

[Ktmracer419]

isnt this like fuel pump #142? whats the deal with that shiat if thats the issue

confusing me with someone else? or goin all on me?

this is the factory pump

[HeavyMetal]

didnt you change your fuel pump like 4 times? wtf i could have sworn...

green jeep maybe...

[Ktmracer419]

didnt you change your fuel pump like 4 times? wtf i could have sworn...

green jeep maybe...

yea green jeep
late 2007
fuckin airtex pumps

[Ktmracer419]

it was the fuel pump, she can roast tire again

funny thing is, i would have never thought something was wrong if i didnt throw 33's on the stocker

[Mike]

you'd make a good crew chief on a jet sam

[CSaddict]

IAT will make the ECU pull timing. Check the ohms and see if its in spec.