× Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

CO too high on Hyundai, rich condition, failed emissions test.

More
23 Mar 2019 20:07 #28050 by guafa
About evap system, you can have a small leakage, even if you have proper activation/deactivation. What about disconnect hose that take fuel gases into intake manifold and see what happend?

Please Log in or Create an account to join the conversation.

More
25 Mar 2019 15:57 #28091 by guafa
You said this engine doesn't have EGR system, didn't you?

Have you checked any carbon deposits inside chambers?

Please Log in or Create an account to join the conversation.

  • McFly1
  • Topic Author
  • Offline
  • New Member
  • New Member
More
01 Apr 2019 16:49 #28355 by McFly1
Yes I checked the chambers with endoscope and all looks normal, minimal deposits on pistons. Same as when I rebuilt the head 2 years ago. So now I hooked the evap valve up to the scope to see when it activates. Strangely enough there seems to be voltage on the wire to ecm continuously, Then after a while it starts to go up and down rapidly, more like measuring an ignition pulse. Thought I had interference first, but that was not the case. I pulled the hose from the canister off of the valve and then it went to constant battery voltage again. When it oscillates and I pull the hose, I hear the valve make a rapid puttering noise. Seems to open and close rapidly?! The oscillating increases when revving the engine. Tomorrow I'm pulling the valve out and will test it on the bench with a battery.

Please Log in or Create an account to join the conversation.

  • Not Allowed: to create new topic.
  • Not Allowed: to reply.
  • Not Allowed: to add attachements.
  • Not Allowed: to edit your message.
Time to create page: 0.478 seconds