Timing Issue? I wish I could get this thing to stop pinging!

[gearGrinder]

OK, fixed several problems only to uncover more, now after new plugs and an adjustable vac can my truck PINGS under various conditions.

I have my initial timing down to 10 degrees and have eliminated all but a few situations, namely hard accelerating out of a turn. Partial and WOT throttle under load (going up hill) no longer ping but if you goose hard it coming out of a turn it will ping, but if you accelerate moderately and build to full throttle it is OK...

I really wish I could get it back to how it behaved with the *wrong* plugs in regards to not pinging...

I was thinking about lighter mech adv weights in my dizzy and playing with spring combos and adding vac adv to tune my curve, as it is I am all in around 2000 RPM - and right now my total mechanical advance is 15 degrees

Any thoughts gentlemen?

[pat mccarthy]

hard for me to think your all in at 2000 with stock springs .if so thats a first for me ? stock springs will not come all in at 2000 no way

[gearGrinder]

hard for me to think your all in at 2000 with stock springs .if so thats a first for me ? stock springs will not come all in at 2000 no way

Hard for me to believe too but I have the results documented over several tests I've run

Keep in mind, this is with the vac adv disconnected...

[Mikej]

If your wanting to run 87 octane try restting the fan so you are at 160 deg. again. Also try a cooler plug. Here in the Midwest 91 octane is available most places. 93 octane and you have to know where to get it. So in my opinion 91 octane is pump gas. Also how much vac. advance do you have?

[Itoldyouso]

What happens when you spend the extra 10 cents a gallon and buy 89 octane? Does it still ping? Gas is lousy these days and ethanol is even worse. I even run mid grade in my Honda daily because that puts it where it likes to run best.

What happens when you spring for high test?


Don

[53 Willys]

Check your float level

[skyeking]

What happens when you spend the extra 10 cents a gallon and buy 89 octane? Does it still ping? Gas is lousy these days and ethanol is even worse. I even run mid grade in my Honda daily because that puts it where it likes to run best.

What happens when you spring for high test?
Don

Itoldyouso: 369568

Hi People,
May I suggest that you set everything back to regulation timing etc
and use a different fuel depot for a few weeks...All the best..Skyeking

[Big Tracks]

This will sound elementary and I sure don't want to insult you, but have you checked your vacuum hoses?

I has a sort of similar problem and tracking it down gave me fits.

Jim

[gearGrinder]

If your wanting to run 87 octane try restting the fan so you are at 160 deg. again. Also try a cooler plug

How do I determine which plug would be colder, aside from that, any suggestions on WHICH spark plug to run? (vortec head: 14mm tapered thread, 0.75" thread length)

Also how much vac. advance do you have?

As of last night I am running a total of 34* advance, 10* initial, 14* mechanical, 10* vacuum adv

What happens when you spend the extra 10 cents a gallon and buy 89 octane? Does it still ping? Gas is lousy these days and ethanol is even worse... What happens when you spring for high test?

Next tank full will be high test, I will post results

Check your float level

Will do, just not sure who's data to follow, Carter or Edelbrock...
- Carter suggests 3/8" float level and 15/16" drop
- Edelbrock suggests 7/16" float level and 1-1/4" drop

May I suggest that you set everything back to regulation timing etc and use a different fuel depot for a few weeks...All the best..Skyeking

Sage advice, nothing wrong with re-grounding ourselves every once in a while

I have keep pretty good notes with all the tuning I am doing and every so often I revert things back to a previous point to make sure I get the same old results, so far I do and not extra parts left over either!

Thanks for replies guys!

[18436572]

Check out this guy call Lars Grimsrud. I have used his articles to tune my 327 with vortec heads and Proform HEI. I replaced the adjustable vac can with a stock vac can he listed (AR31 $9 Auto Zone) and it has tuned my motor very well.
http://www.corvetteclub.org.uk/files...and_timing.pdf
http://www.nastyz28.com/~ericf/tech/vacadvance.pdf

[gearGrinder]

Check out this guy call Lars Grimsrud. I have used his articles to tune my 327 with vortec heads and Proform HEI

Cool, thanks!

[Mikej]

A colder plug has the proclean cone that is shorter ( pulled more into the threaded part), bad explaination.

[gearGrinder]

A colder plug has the proclean cone that is shorter ( pulled more into the threaded part), bad explaination.

I was looking for a specific, colder plug for my application but thanks for the explanation!

In the mean time I found a few Champion and Autolite plugs I could try

[BigTruckDriver]

Dont know if this might possibly help but here it is anyways.
http://www.acdelco.com/parts/sparkpl...tification.jsp

[gearGrinder]

Dont know if this might possibly help but here it is anyways.
http://www.acdelco.com/parts/sparkpl...tification.jsp

Good info to have, thanks! Still looking for a Delco plug that will work...