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Old October 24th, 2008, 04:54 PM   #1
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Thumbs down 99 powerstruggle

ok ford boys

i have a 99 f 350 4x4 with the powerstruggle having issues. it keeps stalling out or missing depending on my rpms. it only happens when it rains!! check engine light came on with these codes....

po470 exhast pressure sensor circuit fault

po605 internal control module ROM error

where do i start??

truck has a chip, 4 inch exhast, air intake, after market blow off valve, and a built trans with a few other things too. if that matters......
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Old October 26th, 2008, 10:19 AM   #2
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ok ford boys

i have a 99 f 350 4x4 with the powerstruggle having issues. it keeps stalling out or missing depending on my rpms. it only happens when it rains!! check engine light came on with these codes....

po470 exhast pressure sensor circuit fault

po605 internal control module ROM error

where do i start??

truck has a chip, 4 inch exhast, air intake, after market blow off valve, and a built trans with a few other things too. if that matters......
The P0470 is probably cause by the tube to the sensor being plugged with carbon or could be a bad sensor.

The p0605 is probably caused by your chip.

I don't think either one is your issue. It could be the connection between the the chip and the PCM, you could remove it and drive it or plug it in and out a few times.
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Old October 26th, 2008, 10:24 AM   #3
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These motors have HUGE crankshaft position sensor issues. They will cause intermittant problems without leaving a code. The best way to diagnose this is with an ocilliscope. Find the pattern while running good then look at the pattern when it is running poorly or not at all. If the motor is in a no start condition but crank sensor patter looks good (test at pcm), then the problem is elsewhere.


edit: I believe the Ford dealer has a recall on these sensors. I seen a TSB about the sensor failing suddenly, stranding the vehicle in an unsafe condition (middle of intersection for example).
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Old October 26th, 2008, 10:35 AM   #4
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These motors have HUGE crankshaft position sensor issues. They will cause intermittant problems without leaving a code. The best way to diagnose this is with an ocilliscope. Find the pattern while running good then look at the pattern when it is running poorly or not at all. If the motor is in a no start condition but crank sensor patter looks good (test at pcm), then the problem is elsewhere.


edit: I believe the Ford dealer has a recall on these sensors. I seen a TSB about the sensor failing suddenly, stranding the vehicle in an unsafe condition (middle of intersection for example).

It is actually a Camshaft sensor but they do cause some crazy issues.

Ford has a Recall on them and will replace them with a new style sensor. I have seen some issues with the new ones as well. Most of the time they will cause a stall and no-start. I keep a extra one in the glove box and 10 mm wrench just in case. I chose not to have the recall done as I just installed a new one in my truck a week befor I got my recall letter.
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Old October 26th, 2008, 10:35 AM   #5
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edit: I believe the Ford dealer has a recall on these sensors. I seen a TSB about the sensor failing suddenly, stranding the vehicle in an unsafe condition (middle of intersection for example).
that is correct. i had my truck in the dealer earlier this year for the recall. i never had any problems with mine but took it in anyways. i also keep a spare in my glove box.
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Old October 26th, 2008, 10:37 AM   #6
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sounds like it is about to die

I will buy it for cheap
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Old October 26th, 2008, 10:41 AM   #7
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I replaced crankshaft position senor twice on my 01 but the truck just died leaving me stranded no matter what the weather was.
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Old October 26th, 2008, 06:27 PM   #8
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its got a new crank sensor in it right now and still is having the issue.... im taking the computer out tomarrow and checking the connection. because the plug is in the engine compartment and the computer is in the passenger compartment. it plugs through the firewall kinda stupid i think! thats where im going to start beings how it happens when its wet out!
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Old October 26th, 2008, 08:06 PM   #9
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its got a new crank sensor in it right now and still is having the issue.... im taking the computer out tomarrow and checking the connection. because the plug is in the engine compartment and the computer is in the passenger compartment. it plugs through the firewall kinda stupid i think! thats where im going to start beings how it happens when its wet out!

That's why I said have the CPS pattern checked at PCM to see if there are any harness issues.
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