Quote:
Originally Posted by Franke
I don't know if I can be of much help but looking at the FSM for a 1990 on page 6e3-c1-11and 12, It shows the vacuum and voltage at normal and full power switch settings. Normal mode should be 0.0 kPa and .54 - .62 volts at all times. Full power mode should be 33-66 kPa and 1.3 - 3.1 volts with the Tech1 tool.
You won't have full secondary operation if an engine code is present.
I am also wondering if the ECM is not recognizing full power mode for some reason even though the FP switch is on. Chart C1-F on page 6e3-c1-22.
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Thanks Franke, I went through the manual on these sections, and will go ahead an apply the FP test. If the rich exhaust comes back I'll run the other test. Thanks again for the input, and nice easy to get at locations in the FSM - I have a digital copy bought from WRP - and its a bit of a PITA to look at more than one page at a time.