Could you be too far in advance. I've heard ping when my motor is too far
advanced.

--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Lon Stowell" <LonDot.Stowell@ComcastPeriod.Net> wrote in message
news:LL_eb.662658$Ho3.137482@sccrnsc03...
> Approximately 10/2/03 10:09, William Oliveri uttered for posterity:
> > I've been seeing posts on cleaning carbon from carborated engines. How
> > would I do the same thing on a MPI engine? Pour water in where the air
> > filter hooks onto?
>
> For lack of a better description, at the throttle body. Aka
> the thingie that has a movable plate in it that looks like
> what would have been a throttle plate in an older car.
>
> A squirt gun or spray bottle works ok, some folks put a bit
> of alcohol in the water, but nowhere near enough to actually
> burn.
>

 

Could you be too far in advance. I've heard ping when my motor is too far
advanced.

--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Lon Stowell" <LonDot.Stowell@ComcastPeriod.Net> wrote in message
news:LL_eb.662658$Ho3.137482@sccrnsc03...
> Approximately 10/2/03 10:09, William Oliveri uttered for posterity:
> > I've been seeing posts on cleaning carbon from carborated engines. How
> > would I do the same thing on a MPI engine? Pour water in where the air
> > filter hooks onto?
>
> For lack of a better description, at the throttle body. Aka
> the thingie that has a movable plate in it that looks like
> what would have been a throttle plate in an older car.
>
> A squirt gun or spray bottle works ok, some folks put a bit
> of alcohol in the water, but nowhere near enough to actually
> burn.
>

 

William Oliveri wrote:
> Previously I mentioned I wasn't hearing any pinging from the engine since I
> put the MPI kit on. That has changed. Before I didn't have the distributor
> seated correctly because I didn't have an indexing pin. I since got one and
> seated it correctly and although it's running much better I'm now getting
> ping. I up'd the Octane to no avail so I'm going to JeepsRUs who told me
> they can advance the timing to get rid of the ping.

Bill can you describe the sound? You said you can hear it when idling
and between shifts. I think you may be fixated too much on the idea that
you've got knock or ping. It could be valve train noise, rod knock, a
bad spot on a belt, a bad belt driven component, it could even be your
water pump, also if you have an AC compressor it could be that.

> I was thinking that accumulated carbon may also be a cause of it pinging.
> I'm going down there today to see what can be done.

Carbon causes ping when it is super heated, and becomes an ignition
source. It generally takes some good revs to get carbon that hot; and
should go away when idling or between shifts (unless you commonly shift
"throttle on" for some reason, or your engine is overheating).

If you really do have ping, the fact that it is present at idle RPM's
suggests that timing or fuel deliver (lean condition) is the likely
solution not carbon buildup.

 

William Oliveri wrote:
> Previously I mentioned I wasn't hearing any pinging from the engine since I
> put the MPI kit on. That has changed. Before I didn't have the distributor
> seated correctly because I didn't have an indexing pin. I since got one and
> seated it correctly and although it's running much better I'm now getting
> ping. I up'd the Octane to no avail so I'm going to JeepsRUs who told me
> they can advance the timing to get rid of the ping.

Bill can you describe the sound? You said you can hear it when idling
and between shifts. I think you may be fixated too much on the idea that
you've got knock or ping. It could be valve train noise, rod knock, a
bad spot on a belt, a bad belt driven component, it could even be your
water pump, also if you have an AC compressor it could be that.

> I was thinking that accumulated carbon may also be a cause of it pinging.
> I'm going down there today to see what can be done.

Carbon causes ping when it is super heated, and becomes an ignition
source. It generally takes some good revs to get carbon that hot; and
should go away when idling or between shifts (unless you commonly shift
"throttle on" for some reason, or your engine is overheating).

If you really do have ping, the fact that it is present at idle RPM's
suggests that timing or fuel deliver (lean condition) is the likely
solution not carbon buildup.

 

William Oliveri wrote:
> Previously I mentioned I wasn't hearing any pinging from the engine since I
> put the MPI kit on. That has changed. Before I didn't have the distributor
> seated correctly because I didn't have an indexing pin. I since got one and
> seated it correctly and although it's running much better I'm now getting
> ping. I up'd the Octane to no avail so I'm going to JeepsRUs who told me
> they can advance the timing to get rid of the ping.

Bill can you describe the sound? You said you can hear it when idling
and between shifts. I think you may be fixated too much on the idea that
you've got knock or ping. It could be valve train noise, rod knock, a
bad spot on a belt, a bad belt driven component, it could even be your
water pump, also if you have an AC compressor it could be that.

> I was thinking that accumulated carbon may also be a cause of it pinging.
> I'm going down there today to see what can be done.

Carbon causes ping when it is super heated, and becomes an ignition
source. It generally takes some good revs to get carbon that hot; and
should go away when idling or between shifts (unless you commonly shift
"throttle on" for some reason, or your engine is overheating).

If you really do have ping, the fact that it is present at idle RPM's
suggests that timing or fuel deliver (lean condition) is the likely
solution not carbon buildup.