well it was the egr before and its been disconnected lately just so it would run right. well when i went to crank my truck today it wouldnt run right at all and mis fired worse than it used to. i had no choice but to hook the egj back up, that truck jerks so bad going down the road i couldnt stand it. i scanned my codes and it showed my egr was diconnected (duh) but it also said misfire on cylinder number 4. so im guessing ill but a new egr and get plugs and wires. idk what else i can do.

 

Loose the K&N intake, and throttle body spacer. Then clean your MAF sensor, and connect the EGR back up. Then disconnect the negative battery cable, and touch it to the positive battery cable for a few seconds. This will reset the PCM. You may still have an EGR problem, but it might be coming from the DPFE sensor.

 

i dont agree on the k/n and tbs part. its not a MAF problem. i know that

 

How do you know it is not your MAF? they tend to affect your motor in weird ways.

I would replace your plugs and wires first, do oyu know when the last time they were replaced?

 

i had the missfire code on cylender 4 a wile back it truck ran like crap when cold would go through plugs like crazy. the 98 to 00 4.0s are bad to get a crack in the coolent port in next to the number 4 cylender mine was a head gasket check your coolent mine would use a half a gallen are so in a week also could be a head

 

^^^^the man is right. i have a 2000 4.0 ohv with a blow motor because i didnt listen.get it checked out pronto or itll cost ya alot more in the long run

 

i cleaned it the other week and its been great. not a problem at all.
i plan on plugs and wires even though it hasnt been too long

 

Unless you are oiling the K&N until its drippy then that is not your problem.

How many miles on the plugs and wires?

 

that blows......... i go through antifreeze like crazy. what do i need to check?

 

theirs the problem! you will have to take the heads off and get them checked at a machine shop have them flow tested mine was the drivers side head. i done all the work my self but still had to shell out 400.00 for repairs

 

holy ****. i cant afford that but i gotta have that truck running right. just my luck. awsome........

 

yeah thats what i said but she runs great now no more faul plugs and no more antifreese use. dude if your lived closer to me i could help you fix it its not that bad the only thing thats a pain its going to be the mainfolds

 

so its all gotta come out? or what?

 

just down to the block it can easly be done with the motor in the truck i had mine done in a day started at 9am and got done about 4pm

 

well when it gets back from being painted is there anything i can check to make sure thats the problem? or is that pretty much all it could be?

 

i did some tests on mine like a compreson test all was good i didnt really find any thing till i tore into it and had me head checked and the guy said it was cracked mine coudent be fixed had to get a new head.

 

would my plugs be fouled right now?

 

4.0 OHV's are famous for misfires on #4. It might possibly be a head or head gasket problem but there is a much more common cause. Often, a leak in the gasket between the intake manifold and the head will allow coolant to be sucked into #4 intake runner and cause the misfire and coolant loss.

 

thanks bob figured you would chime in

 

well you both seem to know more about the 4.0s than i do. when i get the truck back you guys can expect me to PM yall if i need help.
thanks