[Gmecm] EST on the 808/165

[ahuxtable at sola.com.au]

Thanks for your input Andrew.  

I have not yet measured the resistance on the pickup coil - That was one of my next tests.  Earth is fine to the dizzy from what I can tell.  I double checked all the earths to make sure they had a good connection but there is a little spade connector coming off the head just under the dizzy that could prb do with a slight pinch with the pliers.  Although, when I pressed/wobbled/moved the wire, it did not make any difference.

I don't think that the problem is anything to do with the data logging - Even if it was, as soon as I went over 2k, it would enable again.

I had a similar problem in a carby car that I converted to EFI with the camira bits but that particular time it was fixed with a new alternator - Voltages were dropping too low (~10v). That is not the problem this time - I'm getting 14v @ run.

I'm gunna have a bit more of a play tonight to try and get this problem licked cos it's REALLY starting to annoy me.

Thanks,
	Andrew


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From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Andrew Hopton
Sent: Sunday, 10 April 2005 7:35 PM
To: gmecm at diy-efi.org
Subject: RE: [Gmecm] EST on the 808/165

The manual I have (referred to in an earlier post) states that EST is also disabled if the ALDL test terminal is earthed, and RPM are below 2000..? Maybe your datalogger is pulling/loading this pin down enough to affect EST.?? Also, the problem with the O2 makes me think you could have a dodgy earth somewhere, which is contributing to both problems. Another area you could look at is the pickup coil (I am assuming you are using a reluctor-style dizzy) and it associated magnet - if you have a digital voltmeter, measure the AC generated - I think it needs to be at least 1.5v to drive the usual Bosch HEI (not 100% sure about that). (Note, the HEI module also needs to be well-earthed thru its mounting holes).? Another thing you could check is the resistance of the pickup coil- should be 500-1500 ohm and not earthed.
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-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Andrew Huxtable, IT Support, Lonsdale
Sent: Thursday, 7 April 2005 9:55 AM
To: gmecm at diy-efi.org
Subject: [Gmecm] EST on the 808/165
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Guys,
??????????? I've got a bit of a question.? I have an 808 based 4Cyl car and for some reason it keeps misfiring at about 3K+.? It's an intermittent fault too.
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I've replaced dizzy cap, rotor, plugs, leads and ignition module and the problem remains.? The problem actually seemed to worsen when I replaced the ignition module so I swapped it back. I'm not getting any ECM codes though.
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I have now started to log the data from the ECM to look into this further and have noticed a couple of things that do not seem right.
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1)?????? Around (not at) the time that it tends to misfire, the O2 goes to 0 (single wire 02)
2)?????? The EST flag is constantly changing with engine running
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Now, according to the doco that I have, if the engine is above 400rpm EST should be enabled i.e it's only in fixed mode when cranking. Does this mean that I've found the problem?? What about the o2?
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Any help appreciated.
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Thanks,
??????????? Andrew
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