crashzx6r

ive got some blowby on my xj now i think shes hinting at getting a new engine...neone know where i can get the cheapest "NEW" long block? im going to look at getting a motor from jy but im trying to find the cheapest brand new long block

cherokee4meplz

is your air filter oily?

okcjeeper

here's what ya need to do to help it.. Pull the valve cover and clean it thoroughly, clean all the parts udner the cover with some brake cleaner and get some of the gunk out of top area of the head. Then you need to replace you CCV valve elbows and the hoses attached to them. replace valve cover using a good gasket. This will help but won't prevent blow by completely.

crashzx6r

ok now i got another question.....i found a grand cherokee motor 4.0 inline six....complete with all parts ecept air box....low miles 94,000 miles. what should i check for when i go look at it... should i bring tools to turn it over 360 deg? i cant hear it run as it is out of the jeep. its only 400 bucks

BuckB91XJ

Dude, blow by oil in the Air Box is just one of those things you deal with when you own a Jeep 4.0. Do ALL of the things that OKC told you to do. This will minimize the oil in your air filter but, not stop it all together. Trust me, when I say, your motor most likely isn't anywhere near blowing on you.
Now, onto the GC 4.0 that you're looking at. Start by asking the junkyard owner was the motor running when pulled? Will he offer any kind of a waaranty with it? If he says I don't know and no to these questions, tell him he can keep it. Now if he can says it ran good when pulled and backs that with a warranty and if he can tell you how many miles it has on it, I'd strongly consider buying it for $400. That's a great deal for a decent running 4.0 with low miles.

crashzx6r

i just got this jeep few months ago...noticed oil in air box didnt think much of it it does have 175,000 miles on it but runs strong....no big oil leaks......the motor is for sale of craigs list.....i was just curious if there was anything major i should look for other than trusting the guys word when he says it runs great....I JUST HOPE IT HAS THE MAIN WIRE HARNESS> AND HOPE MOST ALL OF THE STUFF IS THE SAME LIKE VACUM LINES AND STUFF

crashzx6r

UPDATE>>>>just talked to the guy it has under 1000 miles on it. everything is there but the air box. GUy put it in jeep and rolled it two weeks later. im goin to get it in a week or so. DOES NEONE KNOW IF MY FLY WHEEL AND CONVERTER AND TRANS WILL BOLT RIGHT UP???????

finneys98xj

I'm thinking yes, but with the years being different you are goin to need the harness for the gc.

mycherokee1989

I have the same problem on my 89. I've also been worried about it, but this website seems to explain a lot.
http://jeep.off-road.com/jeep/articl....jsp?id=257985

crashzx6r

it comes with the main harness already on the motor

finneys98xj

u also need computer

crashzx6r

what year models of grand cherokees hadsame computer i may have to go rob one from jy im not sure what year this engine came out of but if i find out maybe i can get on from a nother gc just dont know what years had same computer......

on the not of my blow by....that link does explain alot but my vent tube on top of valve cover has moisture coming through it not so much oil...and moisture in tail pipe. i know most 4.0 s have minor blosw by but constant moisture? and my oil is clean?

crashzx6r

ANY IDEAS GUYS?

cherokee4meplz

is your current engine using coolant?

crashzx6r

havent noticed it using much