I take it back, I do hear pinging at idle
10-13-2003, 01:16 PM
#14
Guest
Posts: n/a
Re: I take it back, I do hear pinging at idle
What kind of ping would that be?
Thanks,
Bill
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F8ABCC6.74170A0A@sympatico.ca...
> You are not hearing a timing ping.
>
> Mike
>
> William Oliveri wrote:
> >
> > When I did my smoke test I heard pinging at idle. Sounds like it's
> > dieseling to me. Sounds like a diesel truck.
Thanks,
Bill
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F8ABCC6.74170A0A@sympatico.ca...
> You are not hearing a timing ping.
>
> Mike
>
> William Oliveri wrote:
> >
> > When I did my smoke test I heard pinging at idle. Sounds like it's
> > dieseling to me. Sounds like a diesel truck.
10-13-2003, 01:16 PM
#15
Guest
Posts: n/a
Re: I take it back, I do hear pinging at idle
What kind of ping would that be?
Thanks,
Bill
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F8ABCC6.74170A0A@sympatico.ca...
> You are not hearing a timing ping.
>
> Mike
>
> William Oliveri wrote:
> >
> > When I did my smoke test I heard pinging at idle. Sounds like it's
> > dieseling to me. Sounds like a diesel truck.
Thanks,
Bill
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F8ABCC6.74170A0A@sympatico.ca...
> You are not hearing a timing ping.
>
> Mike
>
> William Oliveri wrote:
> >
> > When I did my smoke test I heard pinging at idle. Sounds like it's
> > dieseling to me. Sounds like a diesel truck.
10-13-2003, 01:16 PM
#16
Guest
Posts: n/a
Re: I take it back, I do hear pinging at idle
What kind of ping would that be?
Thanks,
Bill
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F8ABCC6.74170A0A@sympatico.ca...
> You are not hearing a timing ping.
>
> Mike
>
> William Oliveri wrote:
> >
> > When I did my smoke test I heard pinging at idle. Sounds like it's
> > dieseling to me. Sounds like a diesel truck.
Thanks,
Bill
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F8ABCC6.74170A0A@sympatico.ca...
> You are not hearing a timing ping.
>
> Mike
>
> William Oliveri wrote:
> >
> > When I did my smoke test I heard pinging at idle. Sounds like it's
> > dieseling to me. Sounds like a diesel truck.
10-13-2003, 01:18 PM
#17
Guest
Posts: n/a
Re: I take it back, I do hear pinging at idle
William Oliveri wrote:
> Air is being sucked into the filter from inside the engine compartment.
>
> HESCO did mention the filter should be as close to the front if the vehicle
> as possible.
>
> Mine is sitting on the left fender well in side the engine compartment.
> About 12 inches from where the old carb system hooked to the grill assembly.
Do a cheap test, find the old ducting and port air from the fender well
to the new inlet, or use anything else you can find that's similar
diameter (wont cause a restriction), and some duct tape to keep the hot
air from getting in. If you've got a conical filter at the head of the
air ducting, then you might have to remove it for the test. Or you could
buy a cold air kit for it if there's one available. Couldn't hurt,
you'll get slightly more HP out of cold dense air even if it isn't
causing the ping.
It could be that you're sucking hot air in and the computer is trying to
compensate for low air density by changing the timing enough that you
ping at idle and lower speeds... the cooler air being pushed into the
engine compartment at higher speeds might explain why you're not hearing
ping at higher speeds. It also might be that the computer for the MPI
kit doesn't have an air sensor and is UNABLE to compensate for the fact
that it's starving for air. Again I don't know much about the MPI kit
though so take all this with a grain of salt.
Most modern EFI engines have something that senses air flow, when this
goes bad, or air filter gets clogged, or the factory cold air ducting
gets a "mod" (like bypassing the pre filter ducting and putting a K&N in
just sitting the under the hood with only the post-filter ducting
connected to the throttlebody). You often hear stories about sudden odd
rough idle problems or pinging at idle.
10-13-2003, 01:18 PM
#18
Guest
Posts: n/a
Re: I take it back, I do hear pinging at idle
William Oliveri wrote:
> Air is being sucked into the filter from inside the engine compartment.
>
> HESCO did mention the filter should be as close to the front if the vehicle
> as possible.
>
> Mine is sitting on the left fender well in side the engine compartment.
> About 12 inches from where the old carb system hooked to the grill assembly.
Do a cheap test, find the old ducting and port air from the fender well
to the new inlet, or use anything else you can find that's similar
diameter (wont cause a restriction), and some duct tape to keep the hot
air from getting in. If you've got a conical filter at the head of the
air ducting, then you might have to remove it for the test. Or you could
buy a cold air kit for it if there's one available. Couldn't hurt,
you'll get slightly more HP out of cold dense air even if it isn't
causing the ping.
It could be that you're sucking hot air in and the computer is trying to
compensate for low air density by changing the timing enough that you
ping at idle and lower speeds... the cooler air being pushed into the
engine compartment at higher speeds might explain why you're not hearing
ping at higher speeds. It also might be that the computer for the MPI
kit doesn't have an air sensor and is UNABLE to compensate for the fact
that it's starving for air. Again I don't know much about the MPI kit
though so take all this with a grain of salt.
Most modern EFI engines have something that senses air flow, when this
goes bad, or air filter gets clogged, or the factory cold air ducting
gets a "mod" (like bypassing the pre filter ducting and putting a K&N in
just sitting the under the hood with only the post-filter ducting
connected to the throttlebody). You often hear stories about sudden odd
rough idle problems or pinging at idle.
10-13-2003, 01:18 PM
#19
Guest
Posts: n/a
Re: I take it back, I do hear pinging at idle
William Oliveri wrote:
> Air is being sucked into the filter from inside the engine compartment.
>
> HESCO did mention the filter should be as close to the front if the vehicle
> as possible.
>
> Mine is sitting on the left fender well in side the engine compartment.
> About 12 inches from where the old carb system hooked to the grill assembly.
Do a cheap test, find the old ducting and port air from the fender well
to the new inlet, or use anything else you can find that's similar
diameter (wont cause a restriction), and some duct tape to keep the hot
air from getting in. If you've got a conical filter at the head of the
air ducting, then you might have to remove it for the test. Or you could
buy a cold air kit for it if there's one available. Couldn't hurt,
you'll get slightly more HP out of cold dense air even if it isn't
causing the ping.
It could be that you're sucking hot air in and the computer is trying to
compensate for low air density by changing the timing enough that you
ping at idle and lower speeds... the cooler air being pushed into the
engine compartment at higher speeds might explain why you're not hearing
ping at higher speeds. It also might be that the computer for the MPI
kit doesn't have an air sensor and is UNABLE to compensate for the fact
that it's starving for air. Again I don't know much about the MPI kit
though so take all this with a grain of salt.
Most modern EFI engines have something that senses air flow, when this
goes bad, or air filter gets clogged, or the factory cold air ducting
gets a "mod" (like bypassing the pre filter ducting and putting a K&N in
just sitting the under the hood with only the post-filter ducting
connected to the throttlebody). You often hear stories about sudden odd
rough idle problems or pinging at idle.
10-13-2003, 01:39 PM
#20
Guest
Posts: n/a
Re: I take it back, I do hear pinging at idle
A tick tick tick can be a leak in an exhaust gasket or a small crack in
the manifold somewhere that only lets a blast out when the pressure is
strong enough to pass through the crack so it pulses in time with the
engine.
Maybe the manifolds need a retorque? That is pretty common on those
long heads.
Heat riser valves are bad for that tick tick tick, but I doubt you have
one although some Jeeps had them. On those the spring can get weak so
the weight on it allows a tick that can really sound like a rod bearing
thinking on going south. That is a valve below the carb with a tube
running under the carb base.
A valve in the exhaust can cause it too, you mentioned something about
an old pulse air I think and the noise comes in pulses???? Hmmm....
A collapsed valve lifter can make a tick too.
Mike
William Oliveri wrote:
>
> What kind of ping would that be?
>
> Thanks,
>
> Bill
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3F8ABCC6.74170A0A@sympatico.ca...
> > You are not hearing a timing ping.
> >
> > Mike
> >
> > William Oliveri wrote:
> > >
> > > When I did my smoke test I heard pinging at idle. Sounds like it's
> > > dieseling to me. Sounds like a diesel truck.
the manifold somewhere that only lets a blast out when the pressure is
strong enough to pass through the crack so it pulses in time with the
engine.
Maybe the manifolds need a retorque? That is pretty common on those
long heads.
Heat riser valves are bad for that tick tick tick, but I doubt you have
one although some Jeeps had them. On those the spring can get weak so
the weight on it allows a tick that can really sound like a rod bearing
thinking on going south. That is a valve below the carb with a tube
running under the carb base.
A valve in the exhaust can cause it too, you mentioned something about
an old pulse air I think and the noise comes in pulses???? Hmmm....
A collapsed valve lifter can make a tick too.
Mike
William Oliveri wrote:
>
> What kind of ping would that be?
>
> Thanks,
>
> Bill
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3F8ABCC6.74170A0A@sympatico.ca...
> > You are not hearing a timing ping.
> >
> > Mike
> >
> > William Oliveri wrote:
> > >
> > > When I did my smoke test I heard pinging at idle. Sounds like it's
> > > dieseling to me. Sounds like a diesel truck.