MazdaManiac dyno tuning in GTA - Spring/Summer 2010
#302
Extraordinary Engineering
The accumulators are recharged when ever intake vacuum exceeds the charge in the accumulator.
My SSV actuator has a small vacuum leak.
This means that the longer it is actuated at WOT the more likely it will drain the vacuum accumulator under the UIM. When this happens the SSV closes and the VDI never opens. At least that's the current hypothesis. Supposition is that the vacuum bleeds off by around 6K RPM
.
Last edited by DarkBrew; 08-30-2010 at 01:22 PM.
#304
Extraordinary Engineering
There has to be a root cause for everything: troubleshooting is what I do!
#305
Extraordinary Engineering
So far I did the DRL module troubleshooting, found a bad relay (one of the CQ1-12V)
Got some replacement parts from the USA and replaced both; they are now working again.
These relays take care of placing the high beam units in series for DRL use so I think that this is the typical failure mode.
Anybody else have this issue? I can easily test your unit and replace the relays.
Now I have to play with the fog light part of the circuit.
#307
Extraordinary Engineering
#316
SPOOLN8
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Do you have any pics of the vacuum pump you used and the actuator you removed? Might as well test mine and replace it if need be while I'm waiting for more turbo parts. Any links to where the actuator is/how to replace or did you just use the shop manual?
#318
Extraordinary Engineering
Here's a picture I borrowed
![](https://www.rx8club.com/attachments/rx-8-parts-sale-wanted-44/161290d1282570623-ssv-vacuum-actuator-ssv_actuator.jpg)
I don't have a picture of my vacuum tester but it's something like this
http://www.princessauto.com/hand-too...ke-bleeder-kit
Note: My actuator appeared to be working fine and only failed to sustain full vacuum in a bleed down test.
Even so, it was costing me lots of HP!
#320
Extraordinary Engineering
It actually sits right on the LIM at the front of the car. It looks really easy to get to until you try.
You also can't buy the part new by itself so you'll have to get a used one. I found a few available.
You also can't buy the part new by itself so you'll have to get a used one. I found a few available.
#321
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Okay, when I get around to testing it and find that it is leaking I'll talk to you about getting a used one..... also to test if it was leaking did you just use the soapy water test? or did you just look to see if the actuator was closing after time?
#322
Extraordinary Engineering
You attach your vacuum hand pump to the SSV actuator, pump the vacuum and then wait to see if it bleeds down or holds. Obviously you need to make sure your test equipment isn't leaking.
Also test your vacuum accumulator which is under the UIM and the VDI actuator which is near the SSV actuator on the LIM.
#323
SPOOLN8
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I don't have a picture of my vacuum tester but it's something like this
http://www.princessauto.com/hand-too...ke-bleeder-kit
http://www.princessauto.com/hand-too...ke-bleeder-kit
Oh sorry didn't see the vacuum gauge in the pic at first glance
#324
Extraordinary Engineering
I tested the actuator and it takes one minute to lose half vacuum in a static test. From the MAF data it looks like the vacuum actuator is closing almost immediately. If it leaks at all then replace it.