possible fix for slow to start cavaliers

[jgwmkw]

Just a note for those who dislike the smell and extra cranking needed to start the older model cavalier's on cng. After some testing, it seems to me the problem stems from the unused fuel left downstream of the low pressure lockoff valve and the time it takes to purge the air back out when starting. To fix this, we have added an impco solenoid ($48) with a new mounting plate just in front of the fuel mass flow sensor. So far it has worked great, car starts on the first crank with no loss of power.

[jblue]

Re: possible fix for slow to start cavaliers

To fix this, we have added an impco solenoid ($48) with a new mounting plate just in front of the fuel mass flow sensor.

Could you please post some pictures of your handywork?

[jgwmkw]

Re: possible fix for slow to start cavaliers

Yes, I'll post some pictures of the rework. It will be a few days until my daughter brings the car back home from school.

[Convert2CNG]

Re: possible fix for slow to start cavaliers

Would this also work for an F-150 bi-fuel?
I noticed that there are about 10 or more cranks when starting on CNG.

[jgwmkw]

Re: possible fix for slow to start cavaliers

Perhaps. I am not familiar with the F-150 set up. To see if it is a similiar problem, I would suggest putting a 0-15 "w.c. pressure gauge on the outlet side of the low pressure regulator. See if the pressure bleeds off after you have shut down the engine.

[jgwmkw]

Re: possible fix for slow to start cavaliers

Here is an attached photo of the rework.