Power loss in jeep 4.0 high out put

mikey450 · Jan 7, 2010

got a problem here my 4 cylinder yota has more power than my buddy's jeep
so i didn't think it was getting any fuel i thought the fuel injectors where clogged
so i went and but a new fuel filter and K 44 power enhancer ran it still just gutless! brand new engine just no power. just wondering if any one has had this problem

and what to do next. trying to fix it...

NotSoPC · Jan 7, 2010

Had the same issue with my last XJ. Redid all the fuel crap and spark but nothin. Sold it before I could get it right.

jeepmauler · Jan 7, 2010

Check the cat for obstruction

JOOP · Jan 7, 2010

jeepmauler said:
Check the cat for obstruction

x2 ....

BUILTnotBOT · Jan 7, 2010

make sure your timings dialed in

sspoonmann · Jan 8, 2010

Do pressure test cylinders to rule out lower end first.
fuel pressure test, rail has port for testing its easy.
check timing

mikey450 · Jan 8, 2010

he dont have a cat con. just muffler

JIBTEXHNKA · Jan 8, 2010

same problem here, engine has 5,000 miles on it and just seems too weak. distributor, plugs and wires are all new, but injectors, fuel pump, etc. is original and i haven't checked any of it yet. i did run a can of seafoam through the tank and it did nothing. catalytic converter is also new.

i suppose it could be a symptom of 34" tires and 4.10 gears but i'm not sure. let me know if you figure anything out and i'll do the same.

greenie · Jan 8, 2010

just something to try...pull the brake booster hose, start it up, let it suck seafoam through, pulling it out just before the motor dies and let it idle up again.
repeat for half the bottle or so, it seemed to help on mine.