SETTING TIMING question (91)
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Junior User
Joined: Aug 2006
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SETTING TIMING question (91)
Its been awhile since I played with the timing.....
I pulled the spout, set it to 12 degrees (idle), shut it down, replaced spout. I then checked the timing....it went to about 20 degrees (idle) with the spout back in place.
Is it supposed to do that ?
I pulled the spout, set it to 12 degrees (idle), shut it down, replaced spout. I then checked the timing....it went to about 20 degrees (idle) with the spout back in place.
Is it supposed to do that ?
Junior User
Joined: Aug 2010
Posts: 81
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From: Charlotte
by coincidence, i just did this tonight also, before starting anything... I checked my vacuum and found it at a steady 18 inches. My vehicle is a 1995 F150. I cranked engine to bring it up to temp, unplugged SPOUT then took positive cable off battery. I then proceeded to adjust base timing. adjusted it to what i think is 10 deg BTDC. The vacuum increased to 20 inches steady needle. I did not turn ignition off, just Plugged SPOUT back in and connected battery cable... took it for a test drive (cpu learning session) but I am having some serious valve pre-detonation. Did I do something out of sequence... or possibly have another problem. My reason for even looking at this was the truck was feeling very weak.
Postmaster
Joined: Aug 2005
Posts: 4,728
Likes: 8
From: Cleveland, TN
I must be misunderstanding what you said, but, May I ask how in the world did you adjust the timing with the battery cable off??? The engine needs to be RUNNING to set the timing..
by coincidence, i just did this tonight also, before starting anything... I checked my vacuum and found it at a steady 18 inches. My vehicle is a 1995 F150. I cranked engine to bring it up to temp, unplugged SPOUT then took positive cable off battery. I then proceeded to adjust base timing. adjusted it to what i think is 10 deg BTDC. The vacuum increased to 20 inches steady needle. I did not turn ignition off, just Plugged SPOUT back in and connected battery cable... took it for a test drive (cpu learning session) but I am having some serious valve pre-detonation. Did I do something out of sequence... or possibly have another problem. My reason for even looking at this was the truck was feeling very weak.
Junior User
Joined: Aug 2010
Posts: 81
Likes: 0
From: Charlotte
Oh yea... i cranked the engine before removing battery cable... the manual said the cable had to be removed to get CPU to reset. so truck was running.
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Postmaster
Joined: Aug 2005
Posts: 4,728
Likes: 8
From: Cleveland, TN
That's a good way to burn up every electronic part (radio, ignition module, etc.) on the truck.. The voltage can go VERY high with the battery disconnected while the engine is running..
You pull the spout connector, start the engine, set the timing, turn off engine, plug in spout connector. THEN, disconnect the battery "IF" you want to, but without the engine running.
You pull the spout connector, start the engine, set the timing, turn off engine, plug in spout connector. THEN, disconnect the battery "IF" you want to, but without the engine running.
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Postmaster
Joined: Aug 2005
Posts: 4,728
Likes: 8
From: Cleveland, TN
If it was off to start with.. Normal setting is 10 degrees from the factory, some people run the timing as high as 14 degrees without problems.. I run mine at 13 degrees, it seems to perform much better than stock..
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