DrRich 1 Posted October 11, 2013 Report Share Posted October 11, 2013 The car runs well enough, no obvious problems and starts straight away even after a few days not running. However, I've been doing some VCDS logging to help tune it up and sort out my incredibly rich WOT problem (AF meter can't read it), which shows that my injector pulsewidths are massive (11-12ms on Saab reds, with only 8psi boost). I then noticed from the logs that at higher RPM my battery voltage was dropping down to 12V! After checking the battery voltage (engine off, key on I could see that the battery voltage on my meter and on VCDS are around 0.5V different. I tried checking the grounds, which all had around 0 ohms between them and battery post, and no obvious voltage drop with the engine off. Not checked with engine on - would it make a difference? Long story short, I've got a difference between voltage measured at the battery and that seen by the ECU. I'm suspicious that the difference increases as RPMs get above about 3000rpm. Any thoughts as to a cause? Cheers Link to post Share on other sites
james4287 1 Posted October 20, 2013 Report Share Posted October 20, 2013 Ecu relay? Have you checked the earths at the ecu? Link to post Share on other sites
michael5556 247 Posted October 20, 2013 Report Share Posted October 20, 2013 Is it an obd1 or 2? Link to post Share on other sites
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