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CF Veteran
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Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
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Iirc the 97+ was all HO. Only things that changed was the exhaust manifold and they eventually went distributerless in later year modeled after 97. Someone correct me if I'm wrong
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Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
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well... the strong 4.0 died today! dont understand, i bought it off of a mechanic and ive taken care of the thing. 230,1** miles. the rods started knocking so since i have to replace the motor does it matter what year motor i put back in it? my jeep is a 97 it was running just fine when all of a sudden i heard the knocking and took it straight to the shop. anyway what im wondering is how hard is it to puul and replace motor and should i try and find the 1997 motor or just find a 4.0 I6? whats the difference between the regualr 4.0 and the high output? since i have to replace would it be better to put the high output in? would that change gas mileage cause i travel a good way to work? thanx guys
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran
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Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
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Year: 1999
Model: Cherokee
Engine: 6 cyl
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::CF Moderator::
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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91 and later were all HO. Not one bit more torque than a Renix and a total increase of 8 HP over a Renix, at about 1500 RPM higher.
The difference is largely due to an increase in throttle body size and freer flowing exhaust.
Great marketing plan by the Chryco guys.
The difference is largely due to an increase in throttle body size and freer flowing exhaust.
Great marketing plan by the Chryco guys.
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Year: 1993
Model: Cherokee
Engine: 4.0L
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Year: 1997
Model: Cherokee
Engine: 4.0
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Year: 1997
Model: Cherokee
Engine: 4.0
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i used penzoil high mileage 10w-30 and its started making a loud knocking noise as i was going down the road and gets louder as i acellerate. i stopped at a mechanic i know he said its most likely the rod knocking.
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Year: 1998
Model: Cherokee
Engine: 4.0
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If I was you I'd replace somethings before putting the new engine in too. Oil pan gasket, rear main seal, oil filter adapter gasket, valve cover gasket, water pump, thermostat, normal things that go on the 4.0 but doing the work on an engine stand will make it heaps easier.
I'd say continue driving your jeep if you know you're going to get a new engine. I've had rod knock for nearly 600 miles and I just go through a quart of oil a week. Go easy on it and see how long it will last.
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Year: 1997
Model: Cherokee
Engine: 4.0
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Probably rod knock, don't worry not to big of a deal. Try to get an engine from 91-99, pre 91 is the renix era and 00, 01 are prone to the head cracking. Get the long block and swap over all of your accessories; sensor's, intake and exhaust manifold, alternator, etc.
If I was you I'd replace somethings before putting the new engine in too. Oil pan gasket, rear main seal, oil filter adapter gasket, valve cover gasket, water pump, thermostat, normal things that go on the 4.0 but doing the work on an engine stand will make it heaps easier.
I'd say continue driving your jeep if you know you're going to get a new engine. I've had rod knock for nearly 600 miles and I just go through a quart of oil a week. Go easy on it and see how long it will last.
If I was you I'd replace somethings before putting the new engine in too. Oil pan gasket, rear main seal, oil filter adapter gasket, valve cover gasket, water pump, thermostat, normal things that go on the 4.0 but doing the work on an engine stand will make it heaps easier.
I'd say continue driving your jeep if you know you're going to get a new engine. I've had rod knock for nearly 600 miles and I just go through a quart of oil a week. Go easy on it and see how long it will last.
thanks alot!! this gives me a project to do at least. i cant say that im gonna have nothing to do! thanx everyone for all the info. if it wasnt for this site i dont know what i would do. except spend way to much money for a mechanic. thanx again
Last edited by dwilly; 05-15-2013 at 09:45 AM.
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Year: 1993 YJ Wrangler
Engine: 4.0 I6
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Probably rod knock, don't worry not to big of a deal. Try to get an engine from 91-99, pre 91 is the renix era and 00, 01 are prone to the head cracking. Get the long block and swap over all of your accessories; sensor's, intake and exhaust manifold, alternator, etc.
If I was you I'd replace some things before putting the new engine in too. Oil pan gasket, rear main seal, oil filter adapter gasket, valve cover gasket, water pump, thermostat, normal things that go on the 4.0 but doing the work on an engine stand will make it heaps easier.
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Join Date: Mar 2013
Location: Pensacola, FL
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Year: 1999
Model: Cherokee
Engine: 4.0
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Can I comfortably put a 3 inch lift on a 95 grand cherokee zj, without replacing anything?
I would be doing the budget boost spacers that go under the springs.
Thanks!
I would be doing the budget boost spacers that go under the springs.
Thanks!
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Join Date: Mar 2012
Location: Grand Rapids, MI
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Year: 2000
Model: Cherokee
Engine: 4.0
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well... the strong 4.0 died today! dont understand, i bought it off of a mechanic and ive taken care of the thing. 230,1** miles. the rods started knocking so since i have to replace the motor does it matter what year motor i put back in it? my jeep is a 97 it was running just fine when all of a sudden i heard the knocking and took it straight to the shop. anyway what im wondering is how hard is it to puul and replace motor and should i try and find the 1997 motor or just find a 4.0 I6? whats the difference between the regualr 4.0 and the high output? since i have to replace would it be better to put the high output in? would that change gas mileage cause i travel a good way to work? thanx guys
Anyway, PM me if you want more info or to talk about the project.. I have pictures too.
Update: I drove it for a year or two with slight knocking- only after It got much worse did it go out on me on the highway, towing a trailer.
Try dumping Seafoam in the engine oil to loosten/clean lifters if they are causing the noise, this might buy you some time.
Last edited by ericsvb; 05-15-2013 at 10:19 AM. Reason: Added Info