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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 05-06-2010
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1998 4.0 stumbles under load

Just yesterday my 4.0 manuel, ext cab , 4x2, w/ 250k on it, started to stumble badly under accl. Once I get up to cruising speed its alright. A starting point would be great. Thanks.
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Old 05-06-2010
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new engine or rebuild kit lol, try plugs,wires,fuel filter, air filter,check fuel pressure, 1st, if that dont fix it get a scanner and check 4 codes on sensors
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Old 05-06-2010
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I really like having the scangageII for looking at sensors.

Could be an exhaust restriction,bad O2, could be a LOT of things. Bad tank of gas?
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Old 05-06-2010
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A dirty MAF can cause that also. Look for dark film on the air filter side of the small sensor wires (requires a Torx tamper-resistant bit to remove sensor). Clean with brake cleaner and compressed air. Might want to check/clean it first before you start buying parts.
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Old 05-07-2010
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When was the last time you changed the plugs and wires?
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Old 05-07-2010
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make sure you dont have a plug wire grounding out. It would still be missing but at crusiing speed you "might" not notice it. Tonight when its dark open the hood and start the truck and look for sparks. Or with the engine off just look for burnt areas on the plug wires. could be a place to start looking.
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Old 05-08-2010
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I just changed the plugs and wires.
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Old 05-08-2010
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might be a fuel pump starting to go out
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Old 05-08-2010
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everything they said lol ^^
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Old 05-08-2010
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your turbo encabaculater is prob out of adjustment. go to the part store and rent the tool for it
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Old 05-19-2010
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Quote:
Originally Posted by old87ranger View Post
your turbo encabaculater is prob out of adjustment. go to the part store and rent the tool for it
No it was the flux capacitor, runs fine now
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Old 05-20-2010
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250k you got your money out of it time to upgrade to a F-250! Or Newer Ranger.
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