SSV Delete. Remove and Block off.
04-26-2023, 12:57 AM
#26
Registered
Zip tied ssv and vdi diaphragm
So the reason I asked is that I have been trouble shooting the ssv and vdi not opening. I haven’t gotten a CEL other than the p0410. I replaced all 3 of the solenoids thinking that was the cause of the CEL. I replaced all of them and still got the CEL along with not having the ssv and vdi move when I rev the engine to 4k plus. I checked the old solenoids and they were working. To clarify, the ones on before weren’t the stock Mazda oem and neither are the new replacements. I then thought it was the diaphragms so I tested both of them with a vacuum pump tester and they worked perfectly fine with holding pressure. I finally decided to zip tie them both open to see if the car would run better and it did (evidently since the power loss is substantial with the ssv and vdi being closed). I did not notice any drivability issues as I drove it on the freeway. Around the street you can see a slight power loss in the low end but nothing drastic. My question is; what could be causing the ssv and vdi to not open. I don’t plan to run the car like this and did it more to trouble shoot it. My only other thought of possible issue is that the previous owner mentioned putting in a new computer. The car has been running great for months after I bought it and just recently developed the issue so I also don’t think the ecu can be the problem. Any advise on what would be the next option to trouble shoot?
04-26-2023, 05:37 AM
#27
they have to work properly or engine output is suffering below 4000 rpm regardless of whether you have the ability to recognize it or not.
I’d suggest that many RX8 owners have no idea what a proper Renesis engine is, it’s quite something when everything is up to snuff, it doesn’t take much to ruin it though
this is a properly running Renesis with a 1000 lbs weight reduction
.
I’d suggest that many RX8 owners have no idea what a proper Renesis engine is, it’s quite something when everything is up to snuff, it doesn’t take much to ruin it though
this is a properly running Renesis with a 1000 lbs weight reduction
Last edited by TeamRX8; 09-07-2023 at 03:11 PM.
04-26-2023, 10:25 AM
#28
So the reason I asked is that I have been trouble shooting the ssv and vdi not opening. I haven’t gotten a CEL other than the p0410. I replaced all 3 of the solenoids thinking that was the cause of the CEL. I replaced all of them and still got the CEL along with not having the ssv and vdi move when I rev the engine to 4k plus. I checked the old solenoids and they were working. To clarify, the ones on before weren’t the stock Mazda oem and neither are the new replacements. I then thought it was the diaphragms so I tested both of them with a vacuum pump tester and they worked perfectly fine with holding pressure. I finally decided to zip tie them both open to see if the car would run better and it did (evidently since the power loss is substantial with the ssv and vdi being closed). I did not notice any drivability issues as I drove it on the freeway. Around the street you can see a slight power loss in the low end but nothing drastic. My question is; what could be causing the ssv and vdi to not open. I don’t plan to run the car like this and did it more to trouble shoot it. My only other thought of possible issue is that the previous owner mentioned putting in a new computer. The car has been running great for months after I bought it and just recently developed the issue so I also don’t think the ecu can be the problem. Any advise on what would be the next option to trouble shoot?
04-27-2023, 10:50 AM
#29
Registered
The problem is your air injection pump. Check the fuse for it, and also check the wiring on the passenger side of the engine bay coming out of the loom, inspecting the two plugs going to that component. Also, check and make sure your pump isnt going bad/seized/or worn out.
07-25-2023, 01:47 PM
#30
Registered
In my case both the SSV and VDI don't open up - I don't get any CELs either. I have zip tied the SSV open only and left the VDI alone since when i did do this I experienced turbulence while cruising on the freeway. I am temporarily running this while i continue to trouble-shoot the issue. I already replaced the three solenoids with no success to remedy the issue. I am currently waiting for the previous owner to come back from overseas deployment so we can connect to the versatuner on his laptop (car came with Versatuner ECU tune). I read on the website that there is a "valet mode" where it detunes the car. I know it's a long shot but at this point i really want to get this issue resolved.
07-25-2023, 01:49 PM
#31
Registered
Reply
Check the reply above, i tried to reply with quote but it did not send successfully.
I have already started the experiment by wiring it open (SSV) and the upper intake crossover butterfly valve has been wired closed.
So far I notice positive results. Throttle is more responsive and no break up around 4-5k rpms (which could be a failing SSV)- which is why I considered this idea. Also 13b's in FCs we always wired open or removed those intake canoes.
There is no issues with starting, in fact it starts quicker to me. No idle issues.
As for fuel mileage- I will have to calculate over this following week. Im due for a fuel up soon and then I will have somthing to start from to see. Except I didnt pay attention to what its current mpg was before hand lol - to me, the mpg is pointless in a car that im constantly racing and revving. You dont buy a sports car for fuel economy /facepalm
I understand the reasoning behind the design, but for trying to get more HP out of the engine with simple ideas is worth a shot.
See response above.
If I find the no issues with this setup, I might leave permanently or remove and bolt a blockoff plate on, but as you know how SSV is, it might be better to leave it installed open than removing and leaving a big open chamber, at least with the SSV open theres a straight flow through the intake.
Any other ideas? Thanks for the responses- except this doofus-
@nycgps /middlefinger love you, no homo
So far I notice positive results. Throttle is more responsive and no break up around 4-5k rpms (which could be a failing SSV)- which is why I considered this idea. Also 13b's in FCs we always wired open or removed those intake canoes.
There is no issues with starting, in fact it starts quicker to me. No idle issues.
As for fuel mileage- I will have to calculate over this following week. Im due for a fuel up soon and then I will have somthing to start from to see. Except I didnt pay attention to what its current mpg was before hand lol - to me, the mpg is pointless in a car that im constantly racing and revving. You dont buy a sports car for fuel economy /facepalm
I understand the reasoning behind the design, but for trying to get more HP out of the engine with simple ideas is worth a shot.
See response above.
If I find the no issues with this setup, I might leave permanently or remove and bolt a blockoff plate on, but as you know how SSV is, it might be better to leave it installed open than removing and leaving a big open chamber, at least with the SSV open theres a straight flow through the intake.
Any other ideas? Thanks for the responses- except this doofus-
@nycgps /middlefinger love you, no homo
09-06-2023, 12:43 AM
#32
Registered
Problem solved
I was able to fix my issue. I replaced the 3 intake solenoids with oem Mazda ones this weekend. After putting the intake manifold back and firing the engine up - I still could not get the VDI and SSV to work. I noticed the vacuum check valve while putting things back. I decided to double check and see if by chance it was working. Sure enough when I pulled it; the valve did not work. I replaced it with an extra one I had and now the problem is fixed. The challenging part is that I received no CEL the whole time I had this issue. Hopefully this might help someone that comes across the same problem.
10-16-2023, 11:26 AM
#34
Registered
I got a CEL for the air pump while having this issue. However, the code went away after installing the CAT for smog. I removed the CAT after smog and still have yet to see the air pump CEL. Does a bad Vacuum check valve trigger this CEL? Good to know for future reference.
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