Donal
Full Access Member
The one on your engine has the boss for a manual gage line. None of the plates leak with correct gasket in good condition.
CEL came on yesterday, 2006 ODB trouble codes
- Thread starter 2006Tahoe2WD
- Start date
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2006Tahoe2WD
Full Access Member
Someone suggested one of the AL machined plate setups. This showed up today.
I'll install when it stops raining.
I'll install when it stops raining.
2006Tahoe2WD
Full Access Member
I took the OEM plate off today. Noticed a nick in the gasket, maybe that is why the leak.
I installed the new billet AL plate but used the original bolts. The supplied bolts/screws had 1/2 the threads. Not good. I'm also not sure about the volume of the cavity for the O-ring but it went together and felt like it bolted flat. Considering the short bolts I would not give this kit a high grade.
2006Tahoe2WD
Full Access Member
I'm now thinking these AL aftermarket plates might affect oil flow in a negative way. As you suggest a new gasket using the existing stock part is probably what I will do.
2006Tahoe2WD
Full Access Member
After replacing the purge and vent valves with OEM, I had a different thought regarding the purge/seal test. Why does the purge to go 10% and vent closed during the "test". I think this could be that if the leak is not more than 10% purge then the leak is small enough to pass the test. This way the EMU "measures" the leak. I'm still waiting for the evap drive cycle to complete or reset the trouble code.
After the "seal" action neither valve should be open. Are you saying that the scan tool is commanding the purge valve to open 10% after the seal?
During the "purge" you should be able to ramp up the purge suction by 10% at a time. The higher that percentage is, the rougher the engine will run because it's (trying to) pull a vacuum on a closed system. But once the purge is closed (by commanding the seal) it should go to 0%.
During the "purge" you should be able to ramp up the purge suction by 10% at a time. The higher that percentage is, the rougher the engine will run because it's (trying to) pull a vacuum on a closed system. But once the purge is closed (by commanding the seal) it should go to 0%.
2006Tahoe2WD
Full Access Member
As you say - during the "purge" the vent closes and the purge command goes to 10%. If you press "increase" the purge command goes to 20% etc. etc.... the vacuum goes up and may get too high and the test will kick you out. Or, while this is happening you hit the "seal" button and I was thinking the purge would be commanded to zero and the ECU would watch along with the viewer how fast the vacuum returns to zero. But the purge valve only returns to 10%, it doesn't go to zero command. I originally thought this was a bug - but maybe it isn't as explained in previous post. I tried an experiment - I confirmed the 10% by using a stethoscope and then I forced the purge command to zero by unplugging it. The vacuum held pretty well. So this leaves me wondering if it is a bug or intentional.
2006Tahoe2WD
Full Access Member
More on this - What does a purge/seal test do?
I found an Autel video on Youtube and when the guy hit "seal" the purge valve went to zero.
2006Tahoe2WD
Full Access Member
It is this video
2006Tahoe2WD
Full Access Member
This guy is good and recommend by other YouTube mechanics as it relates to EVAP.
I think this confirms that the purge valve should go to zero when "sealing".
My theory to that Foxwell might be doing something valid was incorrect.
So, IMHO Foxwell has a bug or this is some sort of pilot error.
My theory to that Foxwell might be doing something valid was incorrect.
So, IMHO Foxwell has a bug or this is some sort of pilot error.
