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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 05-20-2009
swickwake's Avatar
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4.0 giving me troble

my motor has like 160,000 miles and it kicks, sputters, bogs down in acceleration and in crusing speed.

i have change out coils, wires, coil pack. and cleaned the maf.

the only codes the i have been having are misfires in 3,4,6 cylinders since jan. i have changed out plugs like 3 times since then and the symtomes would go a way till 3000 to 8000 miles later.

im thinking i may have warped or cracked heads. but i do not have white oil. i am loosing some coolant tho. is there a way to check for this with out pulling the heads.

please help.

shane
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Old 05-20-2009
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Boggin down and hard mis fires are usually two different things.

I'd call a "bog" a smooth decrease in power. If so.. it's most likely a lack of fuel. Could be a lack of air.. but that's easily fixed by checking the filter.

A hard mis-fire is almost always ignition related. A head gasket or intake gasket leak (or cracked head) won't usually cause this except just after startup.

IMO.. you might have a combination of the two problems. Change the fuel filter and see what that does for the power situation. Then investigate wether of not your getting coolant in the combustion chamber. (might have to go to a shop and have them do leak tests)

Rich
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Old 05-20-2009
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The fuel filter is a good start.

If you think the gasket is the cause a compression test will show that.

Compression Test How-To #1

Compression Test How-To #2

Last edited by karrbass4life; 05-20-2009 at 05:12 PM.
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Old 05-20-2009
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Isn't there a intake gasket problem on the OHV engine? That could be it.
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Old 05-20-2009
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mine had a number 4 missfire ran like crap changed all kinds of ignition stuff never fixed it well i was lossing coolent just like a gallen are 2 every 4 weeks are so pulled heads off had a bad gasket and bad head fixed it and runs like a champ and missfire code is gone.
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