Posted by Bob on May 07, 2009 at 09:15:21 from (69.178.228.68):
In Reply to: 1997 GMC K1500 posted by farmer boy on May 07, 2009 at 08:49:15:
The engine serial/ID number IS on the block, you just need to know where to look.
"Engine Code Stamping Numbers All engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code. V8 codes are stamped on a pad just forward of the right side (passenger) cylinder head."
(Maybe all too old... spend a little time on GOOGLE and look for other sites, as well.)
http://www.mortec.com/
As to the O2 sensor, if it's NOT working it SHOULD set a trouble code... Did I read your Check Engine Light isn't working?
You can read the O2 voltage if you have access to a scan tool, or use a sensitive (digital) voltmeter.
The voltage should cycle above and below about .5 Volts.
Steady reading BELOW .5 Volts indicates a LEAN condition or a failed sensor.
Steady reading ABOVE .5 Volts indicates a RICH fueling condition the 'puter is unable to compensate for (such as a stuck or leaky injector, for example).
Proper base timing and spark advance is important for fuel economy, as well. Have they been checked?
My basic advice to you would be to get the CEL working and learn how to retrieve trouble codes, either with the CEL or a scan tool.
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