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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 05-07-2015
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Drowned truck running rough

Sunk the truck and had a check engine light. Soaked the filter but nothing really got up in the motor. I couldn't keep it running without staying in the gas right after it happened. It drove 2 hrs home ok I guess. Cleaned the maf and iac but still have an extremely rough idle. Bounces between normal and almost dying.

Had codes:

P0103 - Mass air flow high input

P2196 - O2 stack 1 lean

P2198 - O2 sensor signal biased / stuck rich bank 2 sensor 1

and some P0000's.

Do you think I need a new maf? Iac? Something else?


Video starting it up. One of those links should work.

http://vid57.photobucket.com/albums/...psoofjm6qu.mp4
http://s57.photobucket.com/user/seed...jm6qu.mp4.html




Hold my beer and watch this pic.
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Last edited by seed60; 05-07-2015 at 08:54 PM.
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Old 05-07-2015
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That sounds rough. I think I would at least pull the plugs & change the oil.
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Old 05-07-2015
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Originally Posted by camodown View Post
That sounds rough. I think I would at least pull the plugs & change the oil.
Oil looked good. But I haven't checked the plugs. I got some seafoam to run through it. So new plugs might not be bad idea.
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Old 05-07-2015
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Run the sea foam first. Then change the plugs. You probably know that.
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Old 05-08-2015
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SOHC?

Mine does this (not that bad) when the IAC needs cleaned. But Plugs and wires wouldn't be a bad place to start.
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Old 05-08-2015
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Originally Posted by StxDangerRanger View Post
SOHC?

Mine does this (not that bad) when the IAC needs cleaned. But Plugs and wires wouldn't be a bad place to start.
Yes, 2003 SOHC.

I cleaned the iac pretty good with throttle body cleaner and qtips. My buddy was telling me I might have killed the iac with the cleaner. Said maf cleaner would have been better for it.

I'm going to start by getting a new iac and see what happens.
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Old 05-08-2015
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I would start by pulling any and all connectors off and blowing them out, drying them, then put some Dielectric Grease in the connector, they will start corroding if you don't.
Especially sensor connectors like O2s, and MAF

MAF sensor should be fine if cleaned, check connector.

Yes, pull spark plugs, clean and regap, they will be fouled from high moisture in air stream, and check spark plug wire boots, dry them out.

Crank position(CKP) sensor is down by the crank pulley, make sure everything gets cleaned off down there, especially the tone wheel(looks like a gear) that the CKP sensor has to read.

Reset computer then drive it for a few days and check codes again.

IAC controls the air bypassing the throttle plate, it is a controlled vacuum leak, if it has a problem you would usually notice an unstable idle or low and high idle, rough idle, but stable, usually wouldn't be IAC issue.
I can't tell from the video if someone is using the gas pedal or not to change RPMs.
Cold engine start, without touching gas pedal, should be 1,500+ RPM then a quick drop down to 1,100RPM, then it will slowly drop to about 700RPM when engine is fully warmed up.
If it isn't doing that then yes clean IAC(again) and check it's connector, also clean bypass passages in throttle body, IACs don't fail that often so wrecking yard IAC is not a big gamble.

Last edited by RonD; 05-08-2015 at 12:34 PM.
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Old 05-08-2015
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Quote:
Originally Posted by RonD View Post
I would start by pulling any and all connectors off and blowing them out, drying them, then put some Dielectric Grease in the connector, they will start corroding if you don't.
Especially sensor connectors like O2s, and MAF

MAF sensor should be fine if cleaned, check connector.

Yes, pull spark plugs, clean and regap, they will be fouled from high moisture in air stream, and check spark plug wire boots, dry them out.

Crank position(CKP) sensor is down by the crank pulley, make sure everything gets cleaned off down there, especially the tone wheel(looks like a gear) that the CKP sensor has to read.

Reset computer then drive it for a few days and check codes again.

IAC controls the air bypassing the throttle plate, it is a controlled vacuum leak, if it has a problem you would usually notice an unstable idle or low and high idle, rough idle, but stable, usually wouldn't be IAC issue.
I can't tell from the video if someone is using the gas pedal or not to change RPMs.
Cold engine start, without touching gas pedal, should be 1,500+ RPM then a quick drop down to 1,100RPM, then it will slowly drop to about 700RPM when engine is fully warmed up.
If it isn't doing that then yes clean IAC(again) and check it's connector, also clean bypass passages in throttle body, IACs don't fail that often so wrecking yard IAC is not a big gamble.
Thanks. I wasn't messing with the gas. It was doing that on its own. I'm in the process of cleaning everything still. I'll check all that and let you know what happens
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Old 06-26-2015
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It was the mass air flow. Got a bunch of sensors from a junkyard and tried them one by one. There was still a tiny bit of mud on that little bead thing on my old one maf even after cleaning. Purrs like a kitten now. Thanks for all the suggestions.
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