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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 02-20-2008
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Trucks Running Lean..Need Help!

Well my truck has been spark knocking pretty bad so I figured its running lean..so i decided to pull a spark plug and sure enough that sucker was white. What could be causing this? I have the tuner..intake..throttle body..I wouldn't think after it being tuned it should do this.
Thanks for the help.
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Old 02-20-2008
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clean your maf, check your fuel pressure, change your fuel filter, check for vacuum leaks... just a few things to start with.
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Old 02-20-2008
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Where should I check for vacuum leaks? And is there anyway I can test my MAF to see if its bad? And..lol..how can I check my fuel pressure?
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Old 02-20-2008
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Quote:
Originally Posted by vansnxtweek View Post
Where should I check for vacuum leaks? And is there anyway I can test my MAF to see if its bad? And..lol..how can I check my fuel pressure?
Check all of your vacuum lines for leaks, your intake tube, and around your intake manifold and plenum. You can try cleaning the maf, use some crc maf cleaner or a little shot of brake cleaner. Remove the air box lid(or air filter) and you will see, inside the intake tube, the maf's sampling tube. That is what you want to clean, do not use a rag or touch the wires in the sampling tube. To check your fuel pressure, look down the fuel rail for a schrader valve(similar to your valve stems on your wheels). That is where you connect a fuel pressure gauge.
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Old 02-21-2008
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Okay thanks so much Nick...what should my pressure be?
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Old 02-21-2008
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do you have a CEL sayin lean? may be a tune problem. had the lean codes and fred fixed the tune for me and no problems. may be worth a shot.
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Old 02-21-2008
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Quote:
Originally Posted by i_luv_strats View Post
do you have a CEL sayin lean? may be a tune problem. had the lean codes and fred fixed the tune for me and no problems. may be worth a shot.
ontop of that, here is a link to a fuel pressure thread.

https://www.ranger-forums.com/forum2...ad.php?t=58567
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Old 02-21-2008
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Alright Im gonna go out and check these things tomorrow. Paul, today I called up Bamachips and he said that he doesn't think its a tune problem. Believe me I was sure hoping so lol
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