EBPV Removal Problems?
Discussion
You have 3 alternatives. Do as Dr Hess and wire the valve open, remove entirely and replace with a spacer (available from several places here in the UK) or remove entirely along with the cat and replace everything with a cat bypass pipe. I have done the latter and only have the annoyance that the throttle jack (used to counteract the reduced airflow when the valve is shut) still operates. I will disengage this soon as it is unecessary and makes the car over rev when cold. If you remove the EBPV, remember to block the vacuum hose going to it with a screw or something, otherwise the ECU will get confused and remain in cold start mode.
Hope this helps.
Jason '89 SE
Hope this helps.
Jason '89 SE
Open up the front wall of the trunk. Find the soleniod that controls the EBPV, unplug the spade connector to the solenoid, disconnect the 2 hoses going to the solenoid, using the proper size hose barb $.25-$.50 from the hardware or suto parts store connected the hoses together as soon at the engine turns on the EBPV will open and will stay open for many days along as the vac is present. Sometimes it takes days or weeks to loose vac and the EBPV to close but will open up on engine start.
If you don't like it that way it is real easy to put back to the way it was.
If you don't like it that way it is real easy to put back to the way it was.
The EBPV works in concert with the Throttle Jack Diaphragm (TJD). The TJD opens the throttle a bit to keep the engine from dying when the EBPV is closed.
If you only disconnect the EBPV and wire it open but leave the TJD connected , then the result will be an unusually fast idle... like 2800-3200 rpm. When you disable the EBPV, make sure the TJD is disabled as well.
If you simply plug the vacuum hose to the EBPV (and wire the valve open), then also disconnect and plug the vacuum hose at the TJD.
As Calvin mentioned, the GM ECU controlled cars have a changeover relay and two vacuum solenoid valves in the boot relay box that control vacuum to the EBPV and the TJD. The ECU controls the relay which in turn controls the solenoid switches. If you re-plumb the solenoid valve for the EBPV as Calvin mentioned, be sure to take care of the one for the TJD as well (ie, simply disconnect and plug the vacuum hose).
1988 S-Turbos also have the EBPV, but not the ECU controlled changeover relay. And the two vacuum solenoid valves are located in the right roof buttress above the wheel well. If you re-plumb the vacuum hoses to bypass the EBPV solenoid valve and send a full time vacuum to the EBPV, that would leave the EBPV functional an apparently hooked up (good for passing spot emissions inspections). However, it's a pain working up in the buttress area, so plugging the vacuum line down next to the EBPV and wiring the valve open is far easier. Then simply disconnect the vacuum hose at the Throttle Jack and plug that hose as well.
Regardless of how you do it, the end goal is to have full-time vacuum supplied to the EBPV to hold it open (or wire it open) and no vacuum to the Throttle Jack to avoid the fast idle.
In terms of running, there are no downsides to disabling the EBPV. The car will start and run better without it.
G-Turbos don't have the EBPV.
Regards,
Tim Engel
Lotus Owners Oftha North
If you only disconnect the EBPV and wire it open but leave the TJD connected , then the result will be an unusually fast idle... like 2800-3200 rpm. When you disable the EBPV, make sure the TJD is disabled as well.
If you simply plug the vacuum hose to the EBPV (and wire the valve open), then also disconnect and plug the vacuum hose at the TJD.
As Calvin mentioned, the GM ECU controlled cars have a changeover relay and two vacuum solenoid valves in the boot relay box that control vacuum to the EBPV and the TJD. The ECU controls the relay which in turn controls the solenoid switches. If you re-plumb the solenoid valve for the EBPV as Calvin mentioned, be sure to take care of the one for the TJD as well (ie, simply disconnect and plug the vacuum hose).
1988 S-Turbos also have the EBPV, but not the ECU controlled changeover relay. And the two vacuum solenoid valves are located in the right roof buttress above the wheel well. If you re-plumb the vacuum hoses to bypass the EBPV solenoid valve and send a full time vacuum to the EBPV, that would leave the EBPV functional an apparently hooked up (good for passing spot emissions inspections). However, it's a pain working up in the buttress area, so plugging the vacuum line down next to the EBPV and wiring the valve open is far easier. Then simply disconnect the vacuum hose at the Throttle Jack and plug that hose as well.
Regardless of how you do it, the end goal is to have full-time vacuum supplied to the EBPV to hold it open (or wire it open) and no vacuum to the Throttle Jack to avoid the fast idle.
In terms of running, there are no downsides to disabling the EBPV. The car will start and run better without it.
G-Turbos don't have the EBPV.
Regards,
Tim Engel
Lotus Owners Oftha North
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