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Old 11-27-2013, 11:21 PM
gacrkr85 gacrkr85 is offline
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cel codes

Could a bad fuel pressure regulator throw bank 1 and 2 lean codes? I have a 97 f150 with 4.6
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Old 11-28-2013, 07:02 AM
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Probably not.

Those codes are almost (but not) always caused by a vacuum leak, usually in the PCV hose elbows.
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Old 11-28-2013, 07:07 AM
gacrkr85 gacrkr85 is offline
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I have changed all the PVC elbows and lines also new intake gaskets and valve cover gaskets along with o2 sensors. I know the regulator is bad but I just need to figure the codes out. Thanks for the reply
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Old 11-28-2013, 02:14 PM
Bluegrass 7 Bluegrass 7 is offline
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If I may comment, if you know the fuel pressure is not within reasonable limits by a pressure test, repair it then go on to the codes otherwise your trying to deal with two issues at the same time that 'may' be interacting.
The term 'lean' can be interpreted in two ways as referenced to the final cylinder combustion event.
A low amount of fuel with normal air is a lean condition.
An excess of air with normal fuel is a lean condition.
The Ox sensors can detect the Ox level and report it in either of these events as the codes for both banks.
This comes about because the PCM shifts the fuel table richer trying to correct the condition. When these tables shift too far the codes are set.
There can also be the opposite conditions for richness.
All these conditions are specific to fuel injection where both are under separate control of the PCM and depend on the Ox sensors for final 'ratio' control.
Good luck.
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Old 11-28-2013, 04:14 PM
gacrkr85 gacrkr85 is offline
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Thank you for replying. Here's an update. I changes the regulator and cleared the code then I drove for about 10 min and the light popped back on. I'm going crazy. Theres no running issue with the truck at all. It idles fine and stays running at all times. Idk. Somebody help please... thanks
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Old 11-28-2013, 07:56 PM
Bluegrass 7 Bluegrass 7 is offline
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Ok you got one issue repaired.
Your just missing the cause of the air leak.
It could be as simple as the dip stick tube rusting through near the block or the PCV.
With the codes you won't see any drivability issue because only the fuel tables have been shifted to correct the for the fault.
Don't get to excited because it's not a major issue, until you find it.
Just keep looking at different places that can allow unaccounted for air to enter the intake tract even if it is from the crankcase area.
Good luck.
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Old 11-28-2013, 08:28 PM
gacrkr85 gacrkr85 is offline
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OK... update... when I was changing in thregulator I dropped my Alan key on the plenum and noticed a gasket there that goes to my egr. I feel like an idiot but when I went to take the egr off to put the gasket on I noticed one of the bolts on it was only hand tight. So I put the gasket on and tightened it down then cleared the code. No more problems. Thank you all so very much. Have a happy thanksgiving.
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Old 11-28-2013, 09:34 PM
Bluegrass 7 Bluegrass 7 is offline
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Gobble Gobble.
Good luck.
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Old 12-31-2013, 08:17 PM
gacrkr85 gacrkr85 is offline
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funny crackling sound

OK I have another concern... when I accelerate on an incline or when towing my motor makes a bad crackling sound like its low on oil or low on water. But everything is at fill point. Oil is good and coolant is good. What could this noise be? Thanks. 97 f150 4.6l
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Old 12-31-2013, 11:17 PM
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are you talking about spark knock ?
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Old 01-01-2014, 09:26 PM
gacrkr85 gacrkr85 is offline
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No its not a spark knock. Its a crackling sound like u get when ur real low on water or oil. It sounds like balling up trash bags I guess. But its coming from my motor only when I'm pilling a load and accelerate harder to gain speed or when I'm not loaded but climbing an incline and accelerate to gain speed.
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Old 01-01-2014, 09:26 PM
 
 
 
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