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idle diagnostic mode...?

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Old 07-05-2004, 06:45 AM
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Engine: sbc 350
idle diagnostic mode...?

I've noticed that lots of cars have idle problems.
Is there such a thing as an idle diagnostic mode, perhaps
the dealers , or aftermarket gizmoes, have it.
It seems to me that being able to, 'set to fixed IAC',
set fuel pulsewidth, set to fixed spark advance,
would be useful to track down a problem(s).
.
contactpatch
Old 07-05-2004, 07:41 AM
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Car: check
Engine: check
Transmission: check
Re: idle diagnostic mode...?

Originally posted by contactpatch
I've noticed that lots of cars have idle problems.
Is there such a thing as an idle diagnostic mode, perhaps
the dealers , or aftermarket gizmoes, have it.
It seems to me that being able to, 'set to fixed IAC',
set fuel pulsewidth, set to fixed spark advance,
would be useful to track down a problem(s).
.
contactpatch
Many P4 ECMs (later TPI stuff) have mode 4 commands available via the ALDL stream. These commands allow the user to control many of the items you mentioned within the ECM. Need a scan tool that can do this such as the TechII.

RBob.
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