EGR Delete 1kzte (4 Viewers)

[kgrove]

2 VSVs, VSV 1 is connected to chamber A of the actuator and VSV 2 is connected to chamber B of the actuator

There's three running scenarios:

1) EGR valve is closed resulting in air with no exhaust gases; in that scenario ECU is not sending a signal to either of these VSVs so you have no vacuum going into the actuator leaving butterfly completely open

2) EGR system is in operation so the ECU sends a signal to the EGR valve to open letting exhaust gases recirculating into the inlet manifold; here VSV number two is open so you're getting a vacuum into the lower chamber of the actuator and the butterfly closes halfway (vacuum chamber B and not into chamber A) since VSV1 is still closed.

3) Shutdown - ECU sends a signal to both VSV 1 and VSV 2; vacuum into chamber A and chamber B butterfly closes completely smoothing shutdown

Seems like you could have an issue with the vac lines for either A or B coming out of the actuator OR either of the VSVs since you need both for a smooth shutdown. Tubing much cheaper than the glow plugs - a good place to start

This vid. helped me a lot and he walks through the summary above with good pics.:
https://www.youtube.com/watch?v=oPF0vECJAZ8

So it sounds like A) the default is the butterfly is wide open if the vacuum system wasn't working right like might be the case if one of the vsvs were damaged or a tube was split, and B) the butterfly is not involved in startup anyway, so a slow start wouldn't be a possible result from doing something wrong on my EGR delete (I didn't consider that a realistic possibility anyway because I've never had to open up any part of my car to fix something I didn't know I screwed up).

My shut downs are fine, so I'm going to switch gears and see what more testing I can do on the glow plugs before I spend the $200 on the new OEM versions. I might replace those vacuum hoses anyway as they're 30 yrs old and I think I have some tubing laying around, but I doubt that's the problem.

Thanks for the info!