4.0 sohc misfiring at 3200? - Ranger-Forums - The Ultimate Ford Ranger Resource


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

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Old 07-30-2009
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4.0 sohc misfiring at 3200?

so my uncle has an 02 4.0 edge and he came over telling me he had some problems with his truck so i took it for a drive.


takes off blogging way down. and when it finally decides to pick up speed around 45mph when the rpms hit 3200 theres a mean misfire. kinda makes the truck lunge a bit forward.

i dont know very much about these 4.0.....anyone got any ideas?
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Old 07-30-2009
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Check the plugs and wires? How old is the fuel filter? Will the truck rev past 3200 when driving?
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Old 07-30-2009
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missfires generally pop a trouble code. Are you getting a light?
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Old 07-31-2009
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I suspect spark plugs or spark plug wires. I had something similar to this after installing new spark plug wires. It ended up being a spark plug wire that had not snapped all the way in place on the plug and came partially loose. It did not misfire until it got to higher rpm under load. I suspect bad spark plugs of wires would react similar.
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Old 07-31-2009
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Quote:
Originally Posted by graniteguy View Post
missfires generally pop a trouble code. Are you getting a light?
X2 a missfire condition will flash the CEL while its happening as well
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