EGR or Crank Sensor System issue
Thread Starter
Teching In
Joined: Jun 2016
Posts: 26
Likes: 1
EGR or Crank Sensor System issue periodically, after flashing my PCM or clearing codes and restarting, engine starts, rough idles and stalls. Starting again with throttle at 85% or more, the engine will run rough, backfire through throttle body, put out white smoke with unburned fuel smell. If I jockey the throttle to keep it running, it suddenly clears and revs quickly. After that, the engine starts, idles and runs fine with no issues.
I've narrowed it down to EGR or Crank Sensor since the EGR sometimes seems to stick, and also I will get an Crank Sensor code which will clear. Anyone seen this before or have ideas on which one it might be?
I've narrowed it down to EGR or Crank Sensor since the EGR sometimes seems to stick, and also I will get an Crank Sensor code which will clear. Anyone seen this before or have ideas on which one it might be?
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,616
From: Central Cal.
If it's only doing this after a flash or code clear, it is possibly relearning. Do you reflash/clear codes very often? A past reflash might have compromised a file required for starting
periodically, after flashing my PCM or clearing codes and restarting, engine starts, rough idles and stalls. Starting again with throttle at 85% or more, the engine will run rough, backfire through throttle body, put out white smoke with unburned fuel smell. If I jockey the throttle to keep it running, it suddenly clears and revs quickly. After that, the engine starts, idles and runs fine with no issues.
I've narrowed it down to EGR or Crank Sensor since the EGR sometimes seems to stick, and also I will get an Crank Sensor code which will clear. Anyone seen this before or have ideas on which one it might be?
I've narrowed it down to EGR or Crank Sensor since the EGR sometimes seems to stick, and also I will get an Crank Sensor code which will clear. Anyone seen this before or have ideas on which one it might be?
