Matt Cramer wrote:Are you running low-Z injectors by any chance?
Matt Cramer wrote:Check the CAS connector and wiring. I've seen cars where the harness was falling apart at the connector - quite often, in fact.
robd wrote:Managed to get a log of the issue earlier today by change. You can see it at about 758s in the log. If anyone could take a look and let me know what they think would be great.
Thanks very much.
gslender wrote:You will need to figure out how to make it reliably reoccur. Until then it is close to impossible to diagnose.
Didn't you use the stock connector? Is it wired into the harness or via a plug?
Peter Florance wrote:Be sure you can pass this test:
if you unplug MS box and measure resistance from any sensor's (MAT, CLT, TPS) ground to car/engine ground , you should not have continuity.
Oddly it seems to fix a lot of installs
Matt Cramer wrote:I noticed there's substantial noise on the battery voltage trace. This may be causing noise elsewhere. Where is the MS getting power and ground?
Matt Cramer wrote:Many voltmeters won't respond fast enough - this is in the battery voltage trace on the data log.
robd wrote:Matt Cramer wrote:Many voltmeters won't respond fast enough - this is in the battery voltage trace on the data log.
Thanks, I've added that now and can see its fluctuating between about 13.7 to 14.3 on average. I'll try doing some tests as mentioned previously and see what I find.
Just a stab in the dark, but could a duff alternator or battery cause this?
Peter Florance wrote:Maybe, but usually when I see it, it's from bad grounding on harness. Did you make the check I asked?
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