Re: stutters and back fires when throttle floored ...wrangler 4.0 mpi
 

Not at that temperature.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mick Miller wrote:
>
> but lpg works fine ........no backfire

Re: stutters and back fires when throttle floored ...wrangler 4.0 mpi
 

Not at that temperature.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mick Miller wrote:
>
> but lpg works fine ........no backfire

Re: stutters and back fires when throttle floored ...wrangler 4.0 mpi
 

Wouldn't lpg & gasoline require different conditions to run well? My bet is
that whatever setup you have (plugs, coil, etc.) would be optimized for one
or the other, leaving the 2nd running a bit worse. Just my $.02.

"Mick Miller" <061268@hotmail.com> wrote in message
news:403835a0.134533@news.freeserve.com...
>
>
> but lpg works fine ........no backfire
>
> > Back fires are unburned gasoline. And most likely a bad spark plug
> >like Mike has said. I could be burnt valves seeing you use LPG, probably
> >without the hard seat conversion.
> > God Bless America, ßill O|||||||O
> >mailto:-------------------- http://www.----------.com/
> >
> >Mick Miller wrote:
> >>
> >> wish it was.......it works fine on lpg so the spark side and timing is
> >> fine........feels fuel starvation
> >>
> >> >Backfire usually means spark issues to me....
> >> >
> >> >Mike
> >> >86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> >> >88 Cherokee 235 BFG AT's
>

Re: stutters and back fires when throttle floored ...wrangler 4.0 mpi
 

Wouldn't lpg & gasoline require different conditions to run well? My bet is
that whatever setup you have (plugs, coil, etc.) would be optimized for one
or the other, leaving the 2nd running a bit worse. Just my $.02.

"Mick Miller" <061268@hotmail.com> wrote in message
news:403835a0.134533@news.freeserve.com...
>
>
> but lpg works fine ........no backfire
>
> > Back fires are unburned gasoline. And most likely a bad spark plug
> >like Mike has said. I could be burnt valves seeing you use LPG, probably
> >without the hard seat conversion.
> > God Bless America, ßill O|||||||O
> >mailto:-------------------- http://www.----------.com/
> >
> >Mick Miller wrote:
> >>
> >> wish it was.......it works fine on lpg so the spark side and timing is
> >> fine........feels fuel starvation
> >>
> >> >Backfire usually means spark issues to me....
> >> >
> >> >Mike
> >> >86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> >> >88 Cherokee 235 BFG AT's
>

Re: stutters and back fires when throttle floored ...wrangler 4.0 mpi
 

Wouldn't lpg & gasoline require different conditions to run well? My bet is
that whatever setup you have (plugs, coil, etc.) would be optimized for one
or the other, leaving the 2nd running a bit worse. Just my $.02.

"Mick Miller" <061268@hotmail.com> wrote in message
news:403835a0.134533@news.freeserve.com...
>
>
> but lpg works fine ........no backfire
>
> > Back fires are unburned gasoline. And most likely a bad spark plug
> >like Mike has said. I could be burnt valves seeing you use LPG, probably
> >without the hard seat conversion.
> > God Bless America, ßill O|||||||O
> >mailto:-------------------- http://www.----------.com/
> >
> >Mick Miller wrote:
> >>
> >> wish it was.......it works fine on lpg so the spark side and timing is
> >> fine........feels fuel starvation
> >>
> >> >Backfire usually means spark issues to me....
> >> >
> >> >Mike
> >> >86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> >> >88 Cherokee 235 BFG AT's
>

Re: stutters and back fires when throttle floored ...wrangler 4.0 mpi
 

I wrestled with a similar problem after installing a supercharger on my 4.0.
Turns out the fuel pump was only puttting out about 30psi instead of the 45-50
it should. You can easily test the fuel line pressure at the shrader valve
fitting on the fuel rail.

Re: stutters and back fires when throttle floored ...wrangler 4.0 mpi
 

I wrestled with a similar problem after installing a supercharger on my 4.0.
Turns out the fuel pump was only puttting out about 30psi instead of the 45-50
it should. You can easily test the fuel line pressure at the shrader valve
fitting on the fuel rail.

Re: stutters and back fires when throttle floored ...wrangler 4.0 mpi
 

I wrestled with a similar problem after installing a supercharger on my 4.0.
Turns out the fuel pump was only puttting out about 30psi instead of the 45-50
it should. You can easily test the fuel line pressure at the shrader valve
fitting on the fuel rail.

Re: stutters and back fires when throttle floored ...wrangler 4.0 mpi
 

On 22 Feb 2004 16:39:54 GMT, dalewhite@aol.com (Dalewhite) wrote:


thats what i think it is.................but not checked the pressure
yet

what i am getting it when floored.........revs pick up then
stutter!!.....and back fire

gradual throttle much less of a problem

did.....reset the ecu .....by disconecting the battery .......and that
sort of cleared it but its still there

>I wrestled with a similar problem after installing a supercharger on my 4.0.
>Turns out the fuel pump was only puttting out about 30psi instead of the 45-50
>it should. You can easily test the fuel line pressure at the shrader valve
>fitting on the fuel rail.

Re: stutters and back fires when throttle floored ...wrangler 4.0 mpi
 

On 22 Feb 2004 16:39:54 GMT, dalewhite@aol.com (Dalewhite) wrote:


thats what i think it is.................but not checked the pressure
yet

what i am getting it when floored.........revs pick up then
stutter!!.....and back fire

gradual throttle much less of a problem

did.....reset the ecu .....by disconecting the battery .......and that
sort of cleared it but its still there

>I wrestled with a similar problem after installing a supercharger on my 4.0.
>Turns out the fuel pump was only puttting out about 30psi instead of the 45-50
>it should. You can easily test the fuel line pressure at the shrader valve
>fitting on the fuel rail.