Normal for EGR to leak during smoke test? Pics added
#1
#2
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bagytop (07-28-2014)
#3
Have you analyzed your fuel trim data at idle? That will tell you if you need to pursue the smoke test...
If you've verified fuel trims are off at idle, check the rubber 'D" shaped seals along the seam of the intake plenum. That's one common place on the 4.2, as well as intake seals.
Any fault codes?
P0171, P0172 don't necessary indicate a lean condition, if that's what you're getting. Try driving it around the block while monitoring your fuel trims. If you get wacky readings at throttle positions 2, 3 or higher, you may need a MAF. Again, very common on those...
If you've verified fuel trims are off at idle, check the rubber 'D" shaped seals along the seam of the intake plenum. That's one common place on the 4.2, as well as intake seals.
Any fault codes?
P0171, P0172 don't necessary indicate a lean condition, if that's what you're getting. Try driving it around the block while monitoring your fuel trims. If you get wacky readings at throttle positions 2, 3 or higher, you may need a MAF. Again, very common on those...
Last edited by ServiceMasterD; 08-31-2014 at 11:13 PM.
#4
It is normal. The vent holes are there to allow the EGR valve to vent vacuum pressure, allowing it to modulate its position. With no power applied to the valve, it defaults to the open position. If you tried running the smoke test again, but with the key in the on position, the vent should be closed on a properly functioning valve.
#5
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