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Post by calibuild on Oct 8, 2017 18:13:11 GMT
Did you clear all codes?? Do that if other codes not fixed they will come back.. So far so good Gwnwar. Genius. Looks like the new gas cap has fixed the P0455 issue. Thought the gas cap resulted in the small evap leak, but seems to fix large ones too! Last thing is my speedometer reads about 10 mph higher than the GPS speedometer I downloaded. Have read that Miata has an optimistic speedometer, but to say 40 when its 30, or read 60 at 50 is big. Not a huge deal. Anybody know of any easy way to calibrate? Donor had 17 rims, down to 15's now. |
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Post by gwnwar on Oct 9, 2017 8:34:06 GMT
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Post by calibuild on Nov 5, 2017 3:07:18 GMT
Tire size calculator is cool. Went from 17 inch rims on 205 40 17's to 205 50 15's. I didn't change any gears / gearing, but that's not to say it hasn't been done. Large evap leak came back today even with the new gas cap. Looks like I'll to crack the rear again and try something new. Frustrating. Tried to RTV the tubs, and enclose them in shrink wrap to double up.  |
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Post by calibuild on Dec 2, 2017 18:20:41 GMT
Okay.... working on P0455 large evap leak some more today, following the Miata manual. It says to check the purge control system with negative pressure. Think that means validate the purge valve solenoid is still good. Update: to test, remove from car. Both ports should block air. Then run to power and blow and it should click open and air passes through. This works, so doesn't seem like the answer....  |
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Post by calibuild on Dec 5, 2017 1:30:52 GMT
Reading up more on the P0455... would a large evap leak register if my "DIY" charcoal box isn't as thorough as the stock system? It's definitely smaller, and the vent the comes out of it has a sensor on it. 1st picture is without the charcoal box. 2nd box shows where it was installed, the tube coming out to the right is the tube that comes out of the stock box and vents up above the rear passenger wheel. These pictures were before I closed it up, so don't worry to much about the fittings not being snugged up at this point.   |
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Post by calibuild on Jan 1, 2018 16:43:34 GMT
P0455 large evap leak continues to perplex. Unplugged the sensor downstream from the charcoal box vent, code still came on. Charcoal canister or purge valve solenoid don't seem to be the cause. Other than to just start replacing parts, as there are no obvious leaks... probably the next step. Not to enthused about taking my gas tank a part per the instruction manual.    |
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Post by calibuild on Feb 5, 2018 5:58:58 GMT
Hi All - could use some input when it comes the rear fenders. They are on, solid and look good... but when I hit potholes or manhole covers, they bang and rattle. The bracket attached the rear wheel hub seems to move the inch or so towards the wheel and smack the rim. Any thoughts on this? Do I just bend the bracket back further? Put a pad on the bracket? The rear fender looks pretty centered. Appreciate your input.  |
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Post by calibuild on Mar 3, 2018 22:09:29 GMT
Picked up a smoke machine to test where P0455 (Large Evap leak) was coming from, and got to test today. Worked great. Identified a leak coming from the input side into the DIY charcoal box I made. Applied some RTV Black, will test again tommorow after it has cured.  |
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Post by calibuild on Apr 15, 2018 17:23:31 GMT
Okay.... large evap leak is back (P0455). Re-smoke tested the rear tank set up and no leaks. Smoke comes out the charcoal box vent, but that's designed to do so. Unless it's registering too much going out, not sure why that would do it. Replaced the purge solenoid valve up front by the engine... any ideas? Open to any and all input  |
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Post by snowbird1 on Apr 16, 2018 14:17:45 GMT
I'm not familiar with the later Miata EVAP systems but the should be a solenoid valve that closes the canister vent during the vehicle self test and the smoke test.
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Post by calibuild on Apr 17, 2018 20:48:22 GMT
I'm not familiar with the later Miata EVAP systems but the should be a solenoid valve that closes the canister vent during the vehicle self test and the smoke test. Okay, I'll test it this weekend. This is the one up by the engine, correct? Swapped it for a new part, but it could be bad. Here's a pic of the only place I can see smoke come out of when I smoke test the rear setup. This is where it is supposed to vent though.  |
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Post by snowbird1 on Apr 19, 2018 14:35:47 GMT
It looks like the CDCV (Canister Drain Cut Valve) has to be actuated to close the canister vent, can't quite see in your picture but it looks like it is in place, should have white/red and blue/orange wires connected to it, it's wired in parallel with the TPCV (Tank Pressure Control Valve) both valves should actuate when you ground the blue/orange wire with the key on, the white/red wire should be 12V from the ECU relay.
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Post by calibuild on May 13, 2018 1:14:06 GMT
It looks like the CDCV (Canister Drain Cut Valve) has to be actuated to close the canister vent, can't quite see in your picture but it looks like it is in place, should have white/red and blue/orange wires connected to it, it's wired in parallel with the TPCV (Tank Pressure Control Valve) both valves should actuate when you ground the blue/orange wire with the key on, the white/red wire should be 12V from the ECU relay. Snowbird1: thanks for the reply! Have been a bit occupied of late, but got to it. Appears to work when forced from the PCM. Both units click. The purge solenoid valve up front is new. If my DIY charcoal box is a lot smaller, would that be an issue? Picture is second photo. I tried to label everything very specifically, but if the CDCV was backwards, would that do it? As always, appreciate the input.   |
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Post by calibuild on May 14, 2018 20:48:34 GMT
1 more thought, does the catch tank (2) up front have to vent to the same charcoal box (3), and subsequently the CDCV (4) as the fuel tank? I made a separate charcoal box for up front.  |
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Post by jason82 on May 15, 2018 6:56:04 GMT
Out of interest, have you got the original Mazda charcoal canister ? May be worth trying to replace your new one with the proper Mazda part. It looks like the only question mark in the system. One further point, check where the pipe slides over the plastic connectors, there may be a crack in one of them. I don't know what else to suggest sorry apart from if this doesn't work, go for the delete of the canister system. Loving the build, pitty Gwnmar is not active on this forum at the moment, he would tell you what is wrong straight away !
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