codes
codes
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Junior Member
Joined: Dec 2006
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From: Hawaii
thanks for the info...is it because of the bigger pulley I put in, were there is too much air, not enough fuel...what can solve the problem so the check engine light disappears.
Aloha from Hawaii
Aloha from Hawaii
Senior Member
Joined: Oct 2005
Posts: 273
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From: Missouri
check your fuel filter
Check your fuel pressure (shold be ~40@ idle and raise to ~60 under boost)
check the MAF Voltage ( max voltage is b/w 4.5-5.0 most of the time its ~4.8 some max lower and some higher)
These trucks have atendency to blow one of the lines off of the fuel pumps in the tank or break the y-connector.
A larger pulley requires a custom tune and colder plugs like NGK TR6's gapped @ .030-.035 depending on the amout of boost. The MAF's can max out very easily especially on the 99's&00's. If the MAF is maxed out the computer can not add the approiate amout of fuel and the motor goes lean.
If that is the case DO NOT drive the truck as you can destroy the motor.
What size pulley did U install?
Is it custom tuned?
Any other MODS?
Check your fuel pressure (shold be ~40@ idle and raise to ~60 under boost)
check the MAF Voltage ( max voltage is b/w 4.5-5.0 most of the time its ~4.8 some max lower and some higher)
These trucks have atendency to blow one of the lines off of the fuel pumps in the tank or break the y-connector.
A larger pulley requires a custom tune and colder plugs like NGK TR6's gapped @ .030-.035 depending on the amout of boost. The MAF's can max out very easily especially on the 99's&00's. If the MAF is maxed out the computer can not add the approiate amout of fuel and the motor goes lean.
If that is the case DO NOT drive the truck as you can destroy the motor.
What size pulley did U install?
Is it custom tuned?
Any other MODS?
Senior Member
Joined: Aug 2001
Posts: 396
Likes: 0
From: Frisco, TX
I had the same codes.
All those are good ideas especially if you jacked around with your vacuum lines...
Now for the real fun part. More pulley more air more stress on weak parts. Happened to me. I checked and rechecked every friggin hose I could get my hands on and no luck. Then I read somewhere that there is a small rubber elbow at the bottom of the lower intake that tends to rott from the inside out due to oil sitting there.
My hands are too big to fit so it called from removal of the blower and upper intake and sure enough... the hose was the trouble maker. Replaced it with fuel line and took the opportunity to clean everything up nice and pretty and bingo... no more codes.
It's a real PIA but so is tryin all the other things. If you have over 60k on the truck I be willing to bet that is the problem.
All those are good ideas especially if you jacked around with your vacuum lines...
Now for the real fun part. More pulley more air more stress on weak parts. Happened to me. I checked and rechecked every friggin hose I could get my hands on and no luck. Then I read somewhere that there is a small rubber elbow at the bottom of the lower intake that tends to rott from the inside out due to oil sitting there.
My hands are too big to fit so it called from removal of the blower and upper intake and sure enough... the hose was the trouble maker. Replaced it with fuel line and took the opportunity to clean everything up nice and pretty and bingo... no more codes.
It's a real PIA but so is tryin all the other things. If you have over 60k on the truck I be willing to bet that is the problem.
Thread Starter
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Junior Member
Joined: Dec 2006
Posts: 4
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From: Hawaii
Originally Posted by rickgig
I had the same codes.
All those are good ideas especially if you jacked around with your vacuum lines...
Now for the real fun part. More pulley more air more stress on weak parts. Happened to me. I checked and rechecked every friggin hose I could get my hands on and no luck. Then I read somewhere that there is a small rubber elbow at the bottom of the lower intake that tends to rott from the inside out due to oil sitting there.
My hands are too big to fit so it called from removal of the blower and upper intake and sure enough... the hose was the trouble maker. Replaced it with fuel line and took the opportunity to clean everything up nice and pretty and bingo... no more codes.
It's a real PIA but so is tryin all the other things. If you have over 60k on the truck I be willing to bet that is the problem.
All those are good ideas especially if you jacked around with your vacuum lines...
Now for the real fun part. More pulley more air more stress on weak parts. Happened to me. I checked and rechecked every friggin hose I could get my hands on and no luck. Then I read somewhere that there is a small rubber elbow at the bottom of the lower intake that tends to rott from the inside out due to oil sitting there.
My hands are too big to fit so it called from removal of the blower and upper intake and sure enough... the hose was the trouble maker. Replaced it with fuel line and took the opportunity to clean everything up nice and pretty and bingo... no more codes.
It's a real PIA but so is tryin all the other things. If you have over 60k on the truck I be willing to bet that is the problem.
How much miles did you have when the problem started. I got only 34k on my 99. The first owner pretty much kept in the garage.
Thread Starter
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Junior Member
Joined: Dec 2006
Posts: 4
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From: Hawaii
Originally Posted by LTNDave
check your fuel filter
Check your fuel pressure (shold be ~40@ idle and raise to ~60 under boost)
check the MAF Voltage ( max voltage is b/w 4.5-5.0 most of the time its ~4.8 some max lower and some higher)
These trucks have atendency to blow one of the lines off of the fuel pumps in the tank or break the y-connector.
A larger pulley requires a custom tune and colder plugs like NGK TR6's gapped @ .030-.035 depending on the amout of boost. The MAF's can max out very easily especially on the 99's&00's. If the MAF is maxed out the computer can not add the approiate amout of fuel and the motor goes lean.
If that is the case DO NOT drive the truck as you can destroy the motor.
What size pulley did U install?
Is it custom tuned?
Any other MODS?
Check your fuel pressure (shold be ~40@ idle and raise to ~60 under boost)
check the MAF Voltage ( max voltage is b/w 4.5-5.0 most of the time its ~4.8 some max lower and some higher)
These trucks have atendency to blow one of the lines off of the fuel pumps in the tank or break the y-connector.
A larger pulley requires a custom tune and colder plugs like NGK TR6's gapped @ .030-.035 depending on the amout of boost. The MAF's can max out very easily especially on the 99's&00's. If the MAF is maxed out the computer can not add the approiate amout of fuel and the motor goes lean.
If that is the case DO NOT drive the truck as you can destroy the motor.
What size pulley did U install?
Is it custom tuned?
Any other MODS?
I'm the second owner, so I need to find out what size the pulley. As for other moods, custom headers, magnaflow mufflers, bessani x-pipe, K&N filter and a 2" and 4" belltech dropkit, spindles in the front, leafs for the rear. I think it did not get a custom tune.
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Joined: Aug 2001
Posts: 396
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From: Frisco, TX
Originally Posted by Chazkale15
How much miles did you have when the problem started. I got only 34k on my 99. The first owner pretty much kept in the garage.
I did plenty of searching on the boards and it appears this is a problem area for other 5.4 motors too. I think I first found it mentioned on the old Lincoln Blackwood site.
Since I replaced the hose (4 months ago) all was well until I put an ARE airtube on it. The PCV and the hose from the IAC area of the blower seemed to fit fine on the tube without hose clamps. But in time, they weakened and I got the codes twice. Threw on a hose clamp, cleared the codes and all is well.
I guess it possible for the upper air intake to be loose and throw the same codes or even the blower to the upper intake.
Best bet though... the hose on the bottom of the lower intake.
