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cng fuel problem

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Old 03-24-2007, 02:13 PM
ron dennis ron dennis is offline
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cng fuel problem

I pulled a p1152 code out of the truck's computer, I have a 1997 f-250 5.4 ltr that is dedicated cng...no gasoline. It has a 4 speed automatic.

Anyway I was driving on the freeway when the engine light popped on and I noticed a slight skip here and there. When I left a store parking lot and turned the corner the truck started to sputter and then just quit like I had turn the ignition off.

Now I bench tested the two o2 sensors using a small flame from a blow torch to measure if I had a changing electical value that ranges from 0.1 to 0.9 and they seem to react fine so I cleaned them up and popped them back in. I know that the p1152 is not an exact pin point cause for the problem. I grabbed a can of starting fluid and rigged up a vacuum hose tied into the intake manifold and sprayed as I cranked the engine, it started right up and ran fine until I ran out of fluid. I tried to start it back up less the fluid but it will not start so I feel it may be a fuel regulator problem? I know I have pressure 3000 psi going into the regulator because I opened the drain valve on the filter housing which goes right into the regulator and it has plenty of blasting pressure so I am sure that is good.

I have checked for vacuum leaks, pcv valve, dipstick seating etc...

Anyone have an idea about what the problem is I would like to hear it, thanks ahead of time.
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Old 03-26-2007, 10:44 AM
jimandmandy jimandmandy is offline
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You will have to find out exactly what that code means. An O2 sensor failure will NOT cause the engine to quit altogether, just go into "open loop".

Jim
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2003, cng, cngfuel, f150, f250, fliud, ford, fuel, location, module, problam, problems, regulator, starting, truck

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