Compuvalve Problem

[Ggiant]

Hi Everyone,
I'm new to the CNG world as of a few months ago when I purchased a 2001 F-150 bifuel pickup. I've been driving it problem free until tonight. I'm out of CNG and had been running on gasoline for 1 day, but now the vehicle won't start. The problem started when I manually flipped the switch over to gasoline before starting the engine. The battery/starter etc. seem to be functioning properly, it just won't turn over. I'm wondering if its possibly the compuvalve not switching the fuel system over to gasoline when I flip the switch. Any help out there?

Thanks!

[afvman]

Re: Compuvalve Problem

Ggaint,

No quick answers but maybe a suggestion. The GFI/Compuvalve system does have self-diagnostic capibility. If you can get it to a CNG technician, he/she should be able to check the computers for any set codes.

Easier said than done, but your best bet.

afvman/Bill

[Ggiant]

Re: Compuvalve Problem

Any recommendations on a Utah CNG mechanic?

[afvman]

Re: Compuvalve Problem

GGaint,

This might get kicked but, I just talked with an old friend, Dave Duey at:

Semi Service, Inc.

N.G.V. Vehicles

Customer Service

Address
1111 South 300 West, SLC, UT Phone
(801) 355-9255

They are hosting the NGV training class there next month and might be able to help.

Bill

[maxman]

Re: Compuvalve Problem

Read down a few posts. There's a very good CNG Ford specific mechanic in SLC. He replaced my compuvalve and is certified.
Max

[cngdude]

Re: Compuvalve Problem

When you say will not turn over, does that mean it cranks OK but won't fire?Do you have any codes? I have a 2001 Ford also and starter died suddenly, I think the compuvalve is for CNG only Bob B

[Ggiant]

Re: Compuvalve Problem

When I say it won't turn over I mean just as you say...it cranks just fine, but won't start. The problem seems to be sporatic and I have found a ford technical service bulletin (TSB) that I think addresses the problem. The document states that when the "low flow injector" on the compuvalve gets stuck the vehicle will crank, but not start. Look up TSB 03-10-3. There seem to be a number of articles about this in the Ford TSB library.

Thanks for all the input everyone.