i had to have a used motor put in my 01 XJ and apparently the peopel i got the motor gave me the wrong motor. and now im getting a random misfire code. the plugs and the whole coil pack have been replaced and its still there. so i took it in and i was told its the wrong head for my year of jeep so i need to find out where to find out where i can look to find out what year that motor is so i can put the right coil pack on it. any idea guys?
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wrong head on the motor?
- Thread starter fraige
- Start date
88 Wagonman
NAXJA Forum User
- Location
- Boise, ID
Need more info. Is it a 4.0L? Was the motor new, used, rebuilt? Was it a longblock or complete pull out? If it had the valve cover, was it aluminum or steel? What number was on the old spark plugs? Did you change the flexplate?
The head on the 2001 4.0L is prone to cracking, but can easily be swapped to an earlier year as long as it is not from a renix era engine (87-90)
The head on the 2001 4.0L is prone to cracking, but can easily be swapped to an earlier year as long as it is not from a renix era engine (87-90)
winterbeater
NAXJA Forum User
- Location
- Royal Oak, Michigan
The head shouldn't have anything to do with it. The electronics need to be compatable with each other. The heads before the 0331 (late '99-'01) don't have the bosses for the coil pack. Seems like random misfire could be related to injectors also.
Forget about that head crap they told you and check out your cam position sensor indexing. There are many threads on the forum about that.
Forget about that head crap they told you and check out your cam position sensor indexing. There are many threads on the forum about that.
winterbeater
NAXJA Forum User
- Location
- Royal Oak, Michigan
Verify this first, it's free. Unless you have to buy the toothpick.
http://motorage.search-autoparts.co...estandard//motorage/292005/169830/article.pdf
http://motorage.search-autoparts.co...estandard//motorage/292005/169830/article.pdf
92XJPortageWI
NAXJA Forum User
- Location
- Flagstaff,AZ
what plugs are you running now? if its still bosch, throw them out. even though they "fit" they dont have the correct resistance. i work at a parts store and we get tons of returns on the bosch plugs for misfires. put in what OEM calls for
winterbeater
NAXJA Forum User
- Location
- Royal Oak, Michigan
Didja read it or am I wasting my time?
Verify this first, it's free. Unless you have to buy the toothpick.
http://motorage.search-autoparts.com...30/article.pdf
The friggin motor year doesn't matter.
winterbeater
NAXJA Forum User
- Location
- Royal Oak, Michigan
The only thing that matters a little is the head number. It visible from the top halfway back in the middle on the drivers side. If it says 0331, it's the correct head for late '99 thru 2001, which is bad news because they crack. An earlier head is better, but the coil rail needs to be mounted on adapters. But none of this matters for your problem. Figure out what is wrong. It's not your head or engine year.
