stutters and back fires when throttle floored ...wrangler 4.0 mpi
02-22-2004, 12:57 AM
#21
Guest
Posts: n/a
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
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Mick Miller wrote:
>
> but lpg works fine ........no backfire
02-22-2004, 12:57 AM
#22
Guest
Posts: n/a
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
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Mick Miller wrote:
>
> but lpg works fine ........no backfire
02-22-2004, 11:04 AM
#23
Guest
Posts: n/a
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
>
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
>
02-22-2004, 11:04 AM
#24
Guest
Posts: n/a
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
>
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
>
02-22-2004, 11:04 AM
#25
Guest
Posts: n/a
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
>
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
>
02-22-2004, 11:39 AM
#26
Guest
Posts: n/a
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.
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.
02-22-2004, 11:39 AM
#27
Guest
Posts: n/a
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.
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.
02-22-2004, 11:39 AM
#28
Guest
Posts: n/a
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.
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.
02-22-2004, 06:47 PM
#29
Guest
Posts: n/a
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.
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.
02-22-2004, 06:47 PM
#30
Guest
Posts: n/a
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.
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.