Ping revisited
 

Hey all,
85 CJ7/258/Carter BBD/recent rebuild/computer back in the loop for now

I've finally got some time to deal with the mild ping my engine has (running
any Octane rating). Here's the story: I recently had the engine rebuilt. It
pings on mild acceleration only. If I put my foot into it, the ping stops.
Correct me if I'm wrong but that indicates a lean condition at cruising
throttle, right? I'm 99% certain there are no vac leaks - replaced all vac
stuff a year ago. I've replaced the distributor because the shop said the
weights were worn out on my old one and they weren't keeping the timing from
going off the dial. I also replaced the EGR -- definitely working as
expected. The shop told me that since it still pings on mild acceleration
after replacing the distrib and EGR, that I need to richen the mix a little
(not the idle mix obviously). Looking at the gizmos under the vent cover
plate on the carb, what do/can I adjust? TIA for any help.

Kurt

Re: Ping revisited
 

You're too far advanced, when you stick your foot in it your vacuum
advance has less vacuum therefore retards the spark to a place it can
burn the gas.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

KurtS wrote:
>
> Hey all,
> 85 CJ7/258/Carter BBD/recent rebuild/computer back in the loop for now
>
> I've finally got some time to deal with the mild ping my engine has (running
> any Octane rating). Here's the story: I recently had the engine rebuilt. It
> pings on mild acceleration only. If I put my foot into it, the ping stops.
> Correct me if I'm wrong but that indicates a lean condition at cruising
> throttle, right? I'm 99% certain there are no vac leaks - replaced all vac
> stuff a year ago. I've replaced the distributor because the shop said the
> weights were worn out on my old one and they weren't keeping the timing from
> going off the dial. I also replaced the EGR -- definitely working as
> expected. The shop told me that since it still pings on mild acceleration
> after replacing the distrib and EGR, that I need to richen the mix a little
> (not the idle mix obviously). Looking at the gizmos under the vent cover
> plate on the carb, what do/can I adjust? TIA for any help.
>
> Kurt

Re: Ping revisited
 

You're too far advanced, when you stick your foot in it your vacuum
advance has less vacuum therefore retards the spark to a place it can
burn the gas.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

KurtS wrote:
>
> Hey all,
> 85 CJ7/258/Carter BBD/recent rebuild/computer back in the loop for now
>
> I've finally got some time to deal with the mild ping my engine has (running
> any Octane rating). Here's the story: I recently had the engine rebuilt. It
> pings on mild acceleration only. If I put my foot into it, the ping stops.
> Correct me if I'm wrong but that indicates a lean condition at cruising
> throttle, right? I'm 99% certain there are no vac leaks - replaced all vac
> stuff a year ago. I've replaced the distributor because the shop said the
> weights were worn out on my old one and they weren't keeping the timing from
> going off the dial. I also replaced the EGR -- definitely working as
> expected. The shop told me that since it still pings on mild acceleration
> after replacing the distrib and EGR, that I need to richen the mix a little
> (not the idle mix obviously). Looking at the gizmos under the vent cover
> plate on the carb, what do/can I adjust? TIA for any help.
>
> Kurt

Re: Ping revisited
 

You're too far advanced, when you stick your foot in it your vacuum
advance has less vacuum therefore retards the spark to a place it can
burn the gas.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

KurtS wrote:
>
> Hey all,
> 85 CJ7/258/Carter BBD/recent rebuild/computer back in the loop for now
>
> I've finally got some time to deal with the mild ping my engine has (running
> any Octane rating). Here's the story: I recently had the engine rebuilt. It
> pings on mild acceleration only. If I put my foot into it, the ping stops.
> Correct me if I'm wrong but that indicates a lean condition at cruising
> throttle, right? I'm 99% certain there are no vac leaks - replaced all vac
> stuff a year ago. I've replaced the distributor because the shop said the
> weights were worn out on my old one and they weren't keeping the timing from
> going off the dial. I also replaced the EGR -- definitely working as
> expected. The shop told me that since it still pings on mild acceleration
> after replacing the distrib and EGR, that I need to richen the mix a little
> (not the idle mix obviously). Looking at the gizmos under the vent cover
> plate on the carb, what do/can I adjust? TIA for any help.
>
> Kurt

Re: Ping revisited
 

You're too far advanced, when you stick your foot in it your vacuum
advance has less vacuum therefore retards the spark to a place it can
burn the gas.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

KurtS wrote:
>
> Hey all,
> 85 CJ7/258/Carter BBD/recent rebuild/computer back in the loop for now
>
> I've finally got some time to deal with the mild ping my engine has (running
> any Octane rating). Here's the story: I recently had the engine rebuilt. It
> pings on mild acceleration only. If I put my foot into it, the ping stops.
> Correct me if I'm wrong but that indicates a lean condition at cruising
> throttle, right? I'm 99% certain there are no vac leaks - replaced all vac
> stuff a year ago. I've replaced the distributor because the shop said the
> weights were worn out on my old one and they weren't keeping the timing from
> going off the dial. I also replaced the EGR -- definitely working as
> expected. The shop told me that since it still pings on mild acceleration
> after replacing the distrib and EGR, that I need to richen the mix a little
> (not the idle mix obviously). Looking at the gizmos under the vent cover
> plate on the carb, what do/can I adjust? TIA for any help.
>
> Kurt

Re: Ping revisited
 

Hrm. When I back it off from 9 deg BTDC, idle falls to crap. Looks like I
have some more vac issue hunting. tnx Bill.

> From: L.W.(ßill) ------ III <----------@cox.net>
> Organization: Not@Home
> Newsgroups: rec.autos.makers.jeep+willys
> Date: Sun, 02 May 2004 12:31:21 -0700
> Subject: Re: Ping revisited
>
> You're too far advanced, when you stick your foot in it your vacuum
> advance has less vacuum therefore retards the spark to a place it can
> burn the gas.

Re: Ping revisited
 

Hrm. When I back it off from 9 deg BTDC, idle falls to crap. Looks like I
have some more vac issue hunting. tnx Bill.

> From: L.W.(ßill) ------ III <----------@cox.net>
> Organization: Not@Home
> Newsgroups: rec.autos.makers.jeep+willys
> Date: Sun, 02 May 2004 12:31:21 -0700
> Subject: Re: Ping revisited
>
> You're too far advanced, when you stick your foot in it your vacuum
> advance has less vacuum therefore retards the spark to a place it can
> burn the gas.

Re: Ping revisited
 

Hrm. When I back it off from 9 deg BTDC, idle falls to crap. Looks like I
have some more vac issue hunting. tnx Bill.

> From: L.W.(ßill) ------ III <----------@cox.net>
> Organization: Not@Home
> Newsgroups: rec.autos.makers.jeep+willys
> Date: Sun, 02 May 2004 12:31:21 -0700
> Subject: Re: Ping revisited
>
> You're too far advanced, when you stick your foot in it your vacuum
> advance has less vacuum therefore retards the spark to a place it can
> burn the gas.

Re: Ping revisited
 

Hrm. When I back it off from 9 deg BTDC, idle falls to crap. Looks like I
have some more vac issue hunting. tnx Bill.

> From: L.W.(ßill) ------ III <----------@cox.net>
> Organization: Not@Home
> Newsgroups: rec.autos.makers.jeep+willys
> Date: Sun, 02 May 2004 12:31:21 -0700
> Subject: Re: Ping revisited
>
> You're too far advanced, when you stick your foot in it your vacuum
> advance has less vacuum therefore retards the spark to a place it can
> burn the gas.

Re: Ping revisited
 

I would highly recommend you get an automotive stethoscope and track
down the loose part before your engine explodes.

Maybe a bearing cap came loose or one bearing isn't the right size or a
lifter is bad...

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

KurtS wrote:
>
> Hey all,
> 85 CJ7/258/Carter BBD/recent rebuild/computer back in the loop for now
>
> I've finally got some time to deal with the mild ping my engine has (running
> any Octane rating). Here's the story: I recently had the engine rebuilt. It
> pings on mild acceleration only. If I put my foot into it, the ping stops.
> Correct me if I'm wrong but that indicates a lean condition at cruising
> throttle, right? I'm 99% certain there are no vac leaks - replaced all vac
> stuff a year ago. I've replaced the distributor because the shop said the
> weights were worn out on my old one and they weren't keeping the timing from
> going off the dial. I also replaced the EGR -- definitely working as
> expected. The shop told me that since it still pings on mild acceleration
> after replacing the distrib and EGR, that I need to richen the mix a little
> (not the idle mix obviously). Looking at the gizmos under the vent cover
> plate on the carb, what do/can I adjust? TIA for any help.
>
> Kurt