Ping, detonation only at start up crank

For anything machine shop / speed shop or engine specific. More technical than the range but not quite tuning specific.
wwhite
Posts: 313
Joined: 2021 Feb 16, 15:53
Location: Victoria, BC, Canada
Vehicle Information: 1994 Flarside, XLT, 351w E4OD
SD48b, Quarter Horse, Burn2

Ping, detonation only at start up crank

Unread post by wwhite »

My basically stock 351w has a single ping/detonation only at start up, just as it fires cold or hot.

Timing is at 10*
This one has stumped me.
Only real difference is the outside temperature hovers +-5* at 32F

Anything in the tune to look for?
decipha
Posts: 4957
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Ping, detonation only at start up crank

Unread post by decipha »

That's typical on high mileage engines. I command 4 degrees of spark on startup to prevent just that.
wwhite
Posts: 313
Joined: 2021 Feb 16, 15:53
Location: Victoria, BC, Canada
Vehicle Information: 1994 Flarside, XLT, 351w E4OD
SD48b, Quarter Horse, Burn2

Re: Ping, detonation only at start up crank

Unread post by wwhite »

Interesting, yup, high mileage. I'll do that.
Thanks so much!!
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