 SOT -Negative spark advance, seeing this on my VW Tiguan |
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| fixer34 |
 Feb 8 2025, 10:41 AM
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Senior Member  Group: Members Posts: 1,248 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest 
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Doesn't appear to be causing a problem, just never seen (looked?) it before. Had an OBD II scanner hooked up which also does real time monitoring. Was driving around and noticed that stopped/at idle, rpm was 750-800 and spark advance was -15 (15 ATDC?). Normal around town it runs about 2000rpm and +15, peaking to +20/25 at 3000.
Redline is about 5000, haven't pushed it near that. Also noticed when backing off, even at 1500/2000, the advance will go negative. Is this all part of the computer controlled emissions system? |
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| emerygt350 |
Feb 8 2025, 12:11 PM
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Advanced Member Group: Members Posts: 2,688 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
My mustang does this and it's an 84. Tfi on Ford's require you to disconnect a wire near the tfi module (spout connector) and then you set your timing.
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Posts in this topic
fixer34 SOT -Negative spark advance Feb 8 2025, 10:41 AM
technicalninja Yes, normal operation, especially at idle.
The fi... Feb 8 2025, 10:55 AM technicalninja You want to really see something wild?
On a car w... Feb 8 2025, 11:08 AM
fixer34 Thanks guys, figured it was 'normal' since... Feb 8 2025, 03:31 PM |
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