I've been trying to troubleshoot this problem that only seems to occur when it's really cold out (like between 5 and 15F, more or less). I had the car a the dealer, but it was warmer earlier this week when it was there (like in the 20s) and they couldn't reproduce it, or fathom what the issue was.
Today, it's 5 degrees out and I went out driving while monitoring some measuring blocks. First time, timing related (crank and cam positions). Next, oil temp/pressure related, then fuel pressures, then evap related. Each time, the car would flash the engine light, run really rough and not have any throttle control. I'd pull over, get it in park and shut it off. Turning it on generally let me drive away. A couple of times, it would throw the light again, but eventually, I'd get going normally.
I was not driving hard, in fact RPMs were usually less than 2000 when it happens. No codes, and I did a full scan!
I checked readiness and there was "Evaporative Emissions" saying "failed or Incomplete" (which is why I drove, logging various evap measuring blocks).
I would also check the logs, even graphing some sets of values to look for anomalies Things seemed normal, no sudden change when the engine light went on.
What goes into that engine light? What control it and would cut power like that? I figure something not ECU-related since no codes were stored. I'd appreciate any insights since this makes it very hard to trust the car on the road! I'm happy to go driving and collect more data, and share what I already have.
David
Today, it's 5 degrees out and I went out driving while monitoring some measuring blocks. First time, timing related (crank and cam positions). Next, oil temp/pressure related, then fuel pressures, then evap related. Each time, the car would flash the engine light, run really rough and not have any throttle control. I'd pull over, get it in park and shut it off. Turning it on generally let me drive away. A couple of times, it would throw the light again, but eventually, I'd get going normally.
I was not driving hard, in fact RPMs were usually less than 2000 when it happens. No codes, and I did a full scan!
I checked readiness and there was "Evaporative Emissions" saying "failed or Incomplete" (which is why I drove, logging various evap measuring blocks).
I would also check the logs, even graphing some sets of values to look for anomalies Things seemed normal, no sudden change when the engine light went on.
What goes into that engine light? What control it and would cut power like that? I figure something not ECU-related since no codes were stored. I'd appreciate any insights since this makes it very hard to trust the car on the road! I'm happy to go driving and collect more data, and share what I already have.
David
