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Hi Jimmy,
It might have been better to ask questions in that other thread, where that post is there for reference, but here goes...
I was a little confused by the no-start analysis, where you are talking about the power stage amplifier and gas wet plugs. If I am getting spark then it would seem like the power stage amplifier is working.
That was a general outline of what might happen, for a given types of failures. It wasn't directed specifically to your situation. But you are correct, if the power stage works. The other case is the result if power stage fails.
I don't understand the part about gas wet plugs - because you say that the spark plugs remain dry - how is that so?
Look back at that post and the numbered list and the explanation that follows it (repeated below for convenience and emphasis):
"For example, if spark fails due to a bad Power Stage/Amplifier (2a), there will be a no-start, but with gas-wet plugs, because the FI ECU DID get the needed timing pulses (2b) [to initiate the FI operation]
Two different cases: (1) No start because of no spark, but the FI system was allowed to operate, causing the plugs to get wet while cranking. (2) is a case where the ICU pulse doesn't get to the FI ECU (admittedly rare), so the spark is OK, but no fuel injected.
While you're here, I should point out a mistake on that "tutorial", spotted by (picky) Art B.
"• Jumpering the LEFT side contacts of fuses 4 and 6 will bypass both the 25AMP fuse and the Fuel relay—and will power up both pump as soon as the key is on, for diagnostic start/run testing."
Actually, the pumps will run as soon as fuse 4 and 6 are connected. That's because the input or common (left) side of fuses 6 thru 10 always has battery voltage available. So the voltage from 6 is applied to 4, where it goes off directly to the Main pump, and thru fuse 4 to the Tank pump. [That's how the Fuel relay does it normally, during cranking and running.]
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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