Ingition Timing at Altitude

Jan 20, 2010 | 03:19 PM

bret

Thread Starter

Joined: Jan 2010

Posts: 4

Ingition Timing at Altitude

Have 89 Full Size Blazer, 5.7, Auto, 4x4, TBI. What should ignition timing be at 5000 ft. elevation? Book reads 0 degrees.Is this for sea level?

Jan 20, 2010 | 03:28 PM

swartlkk

Administrator

Joined: May 2005

Posts: 41,334

From: Waterloo, NY

Base timing should be set straight up. The ECU will modify timing as it sees fit based off of the MAP sensor reading.

*moved to Fullsize tech*

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