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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 02-22-2009
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Icon9 misfire..... again

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.
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Old 02-22-2009
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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.
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Old 02-22-2009
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i dont agree on the k/n and tbs part. its not a MAF problem. i know that
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Old 02-22-2009
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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?
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Old 02-22-2009
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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
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Old 02-24-2009
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^^^^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
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Old 02-25-2009
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Quote:
Originally Posted by chainfire View Post
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 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
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Old 02-25-2009
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Unless you are oiling the K&N until its drippy then that is not your problem.

How many miles on the plugs and wires?
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Old 02-25-2009
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Quote:
Originally Posted by Redrocket View Post
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
that blows......... i go through antifreeze like crazy. what do i need to check?
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Old 02-25-2009
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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
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Old 02-25-2009
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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........
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Old 02-25-2009
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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
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Old 02-25-2009
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so its all gotta come out? or what?
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Old 02-25-2009
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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
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Old 02-25-2009
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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?
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Old 02-25-2009
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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.
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Old 02-25-2009
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would my plugs be fouled right now?
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Old 02-25-2009
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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.
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Old 02-25-2009
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thanks bob figured you would chime in
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Old 02-26-2009
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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
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