ECM Fault?

[David Cooley]

At 09:51 AM 12/7/1999 -0500, you wrote:
>MAP sensor is fluctuating constantly along with the idle - I think that's
>normal i.e. with RPM change you get pressure change. I did scope just about
>every signal, including the MAP. The map signal is not flat, it has waves
>corresponding each cylinder I guess, one of them is specially large. I think
>It is because it is close to that particular cylinder. Wave amplitude is
>approx 0.1 to 0.2 V on the largest wave.
>
>I am desparately trying to complete the device to inject the fuel to
>disconnect ECM and see if idle is still fluctuating. If it is, it would
>indicate the mechanical problem.


I think a good point of reference at this point will be a compression check.
Might also add a restrictor to the line to the MAP sensor to minimize the 
fluctuation and see what that does.

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David Cooley N5XMT Internet: N5XMT at bellsouth.net
Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
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