2000 4.0L Ford Ranger Misfire
#1
2000 4.0L Ford Ranger Misfire
I have a problem I've been chasing and It is driving me nuts.
The engine started with a simple misfire, which turned bad 7 mile into my 15-mile drive home. I completed the checklist below with good results until now. I can drive at a steady speed but when I have to do a little acceleration the engine will give me what feels like a continuous misfire. I back off a little and it levels out. The only thing I have not change yet is the fuel filter.
- Check Engine Light on - Error code ? - Misfire #4 Cylinder
- Replaced all spark plugs
- The truck ran fine.
- Check Engine Light on - Error code ? - Misfire #4 Cylinder
- Replaced #4 Spark plug
- Replaced #4 Spark plug Wire
- The truck ran fine.
- No error code: Rough running at approx. 30-40 mph under accel.
- Replaced Ignition Coil pack
- Replaced all Spark plug Wires
- Added a bottle of Dry gas and Fuel injection cleaner.
- No improvement
- Next 2 steps are to replace the Fuel Filter and then the pump.
Any help would be greatly appreciated
The engine started with a simple misfire, which turned bad 7 mile into my 15-mile drive home. I completed the checklist below with good results until now. I can drive at a steady speed but when I have to do a little acceleration the engine will give me what feels like a continuous misfire. I back off a little and it levels out. The only thing I have not change yet is the fuel filter.
- Check Engine Light on - Error code ? - Misfire #4 Cylinder
- Replaced all spark plugs
- The truck ran fine.
- Check Engine Light on - Error code ? - Misfire #4 Cylinder
- Replaced #4 Spark plug
- Replaced #4 Spark plug Wire
- The truck ran fine.
- No error code: Rough running at approx. 30-40 mph under accel.
- Replaced Ignition Coil pack
- Replaced all Spark plug Wires
- Added a bottle of Dry gas and Fuel injection cleaner.
- No improvement
- Next 2 steps are to replace the Fuel Filter and then the pump.
Any help would be greatly appreciated
#2
#4
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hows the water level in the radiotor?? just wondering if you checked it. most the time on a 4.0 with a cly 4 missfire has to do with a cracked head are head gasket. water is geting into the cyr fouling the plug out. i had the same problem a few years back. same problems your having i finaly broke down and tour the motor down and replaced the damaged head. and she runs like a champ.
#5
Radiator level is good. I checked the #4 plug when I changed the remaining wires and coil pak, it was good. Since my initial post w/dry gas & injection cleaner, the miss has disappeared. Fuel filter is being replaced and I'm looking at checking the fuel pressure at the valve on the injection rail. Thanks Crossing Fingers
#7
Update: I replaced the fuel filter and ran a can of sea foam through the engine. The miss has shown back up. I checked the radiator and noticed it down a little. I added fluid to both the radiator and the reservoir. Confusing…now the error code is showing misfire on #6 cyl. with new coil pak. Blown head gskt. I don’t know. I found the date on my last head gasket R & R, 5/14/08. 2 years and 5 months between jobs…I don’t think so.
I love troubleshooting but I’m running out of time with weather and I can’t drive the mustang in the snow. Time to BTB and take it to a shop.
I love troubleshooting but I’m running out of time with weather and I can’t drive the mustang in the snow. Time to BTB and take it to a shop.
#9
Almost seems like a phantom problem. I have been throwing that code for awhile in my 04, and on cylinder 4. Only throws the code every 2-5,000 miles, and especially when its hot out and at idle. I stopped chasing the problem. I literally just delete the code with my programmer in the truck every time it pops up. Hopefully that method doesn't bite me in the ***.
#10
#11
If you just replaced the head gaskets then and not the heads also I would almost bet on a head being cracked.... VERY common in the 4.0 OHV....had it happen on my '99 and went through the procedures you have done until retired ford mechanic convinced me to pull the heads. And it has nothing to do with how the vehicle has be driven/treated, just faulty castings from the factory. Buy the new redesigned heads and all will be well from here on out.
#12
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