Things to eliminate in order:
1 EGR Valve stuck open
I don't want to change this until I rule out why the VSV operates when cold. Can you help me with this?
2 EGR VSV open malfunction
The vsv snaps close at idle and wide open throttle
3 Open in VSV circuit fo EGR
How can the VSV snap close if this is the problem?
4 Short in EGR gas temp sensor
I measured the ohms, seems correct 150 kOhms at 89.8 deg F
5 ECM
This is always the last choice
I just drove it and the P0402 came back while driving, even before warmed up. It had sat overnight.
How do I fix the VSV from opening while cold? I only have 1 working VSV as it replaced the leaking one. Do you think another vsv from the junkyard would work, hey I will just compare numbers. There are a couple vsv's on the car there. I listened to the EGR vsv with a stethoscope and you can hear it cycling, tick tick tick, at low rpm's then the ticking goes away as rpm's increase. Not sure what this means.
How do I fix the VSV from opening while cold?
Thanks for your help
Thursday, October 25th, 2012 AT 2:14 PM