Timing: Pings with spout, great without

[rew729]

I understand factory timing is 10 BTC and optimal timing on stock motor is ~14-16 BTC
With my spout connector removed, timing appears to be just shy of 10 BTC. However, when the spout is connected the PCM seems to be adjusting timing to 20+ BTC (at least at idle).
Is that normal behavior? Should it be running that kind of timing at idle?

With the connector removed the car runs great. It does seem a little down on power but I can at least use the full rev range now.
With the connector plugged in I would always short shift at 3500-4000 due to excessive pinging.

I have not tried to adjust my timing yet but I am wondering if it will help or if there is something else wrong.

 

[Brad6080]

This is a great question. Mine does the same thing. Any answers?

 

[Addermk2]

I understand factory timing is 10 BTC

That is correct, and it should be left there.

and optimal timing on stock motor is ~14-16 BTC

Woefully incorrect, and is a common internet myth started by foxbody guys with no clue.

With my spout connector removed, timing appears to be just shy of 10 BTC. However, when the spout is connected the PCM seems to be adjusting timing to 20+ BTC (at least at idle).
Is that normal behavior? Should it be running that kind of timing at idle?

Yes, 100% normal.

With the connector removed the car runs great. It does seem a little down on power but I can at least use the full rev range now.
With the connector plugged in I would always short shift at 3500-4000 due to excessive pinging.

I have not tried to adjust my timing yet but I am wondering if it will help or if there is something else wrong.

A leaking EGR, excessive oil build up in the intake (from a neglected PCV system), injectors with reduced flow, or a harmonic balancer that has had the timing ring slip... Are all suspect.

 

[Her name is Jaz]

That is correct, and it should be left there.



Woefully incorrect, and is a common internet myth started by foxbody guys with no clue.



Yes, 100% normal.



A leaking EGR, excessive oil build up in the intake (from a neglected PCV system), injectors with reduced flow, or a harmonic balancer that has had the timing ring slip... Are all suspect.

The balancer slip was the first thing that came to my mind. Stockers are junk. I have a new one ready to go on my car now because I have a vibration I don't like. I don't trust the stock balancer. I've seen several builders use the professional products piece so I decided to give it a shot.

Sent from my XT1585 using Tapatalk

 

[Her name is Jaz]

That is correct, and it should be left there.



Woefully incorrect, and is a common internet myth started by foxbody guys with no clue.



Yes, 100% normal.



A leaking EGR, excessive oil build up in the intake (from a neglected PCV system), injectors with reduced flow, or a harmonic balancer that has had the timing ring slip... Are all suspect.

What would you say is optimal timing then?

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[evilcw311]

What would you say is optimal timing then?

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In a stock motor with no real modifications it should be left at 10 degrees, 12 if your just wanting a lil more but don't go past that.

If you have any kind of chip in the car then it should be left at 10 and let the computer do its job and the timing change would be thru your time.


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