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MazdaSpeed 3/6 - Troubleshoot/Diagnostics MazdaSpeed 3/6 - Troubleshoot/Diagnostics - Have a problem with the car? CEL Code? Want to discuss other issues? Come on in!


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 Old 04-11-2019, 09:50 AM   #1
 
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Default HPFP Reads "4" or "6", ITFP Functional

What's up nerds,

I've been troubleshooting for a bit with my MS3. I've had a couple batteries go bad (my yellow top won't even read as connected at the auto shop) and haven't figured out what's wrong.

It started with what FELT like fuel cut under load, (HPFP pressure would drop to 60ish) and then progressed to "fuel cut" (probably a voltage/power supply problem, but lights didn't dim.. just fuel pressure seemed affected) all the time with the car dying, then ended up with HPFP reading 4 or 6 psi. Now it will not start at all.

I got a new alternator after this situation: Battery connected to car (like normal), battery tender connected to battery. Went to start car, wouldn't start. Battery was at 5V, but tender had a green light. I figured the voltage regulator was messed up.

There is spark, and I've hardwired the in tank fuel pump to the battery to test it. It works and the line has residual pressure when I remove it from the fuel basket. HPFP pressure does not display more than 4, and car is not injecting fuel.


Got any suggestions or ideas? Here's what I have planned:
-Parasitic drain test (measuring flow from battery while car is off) and pulling fuses to isolate problem
-Test volts/ohms on spill valve
-Possibly a new ECU? Reset to stock tune?
-Install pressure gauge at ITFP
-New... HPFP rail pressure sensor?
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Last edited by juantaquitos; 04-11-2019 at 01:13 PM. Reason: Add info
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 Old 04-11-2019, 10:33 AM   #2
 
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check electric fuel pump relay and pump
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 Old 04-11-2019, 10:42 AM   #3
 
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Originally Posted by LenSpeed6 View Post
check electric fuel pump relay and pump

I replaced the fuel pump relay and also tried the resistor bypass to run full power to the pump constantly. Itís currently irrelevant because I hardwired the ITFP.

Can you expand on what you mean by checking? Check voltage? Which pump?
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 Old 04-12-2019, 05:44 AM   #4
 
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the in tank pump if you havent already checked, re reading your post it seems like you already have.
maybe change the spill valve/pressure relief valve for hpfp with a known good one to see what happens, seems like you have that in your plans, id go with what your plan is and report back
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Soon: CS HPFP line, fix oil leak from turbo return line and some more stuff....


To think... this is suppose to be my winter car... because,

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'12 1/2 Triumph Daytona 675R stock some how
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 Old 04-12-2019, 06:52 AM   #5
 
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Originally Posted by LenSpeed6 View Post
the in tank pump if you havent already checked, re reading your post it seems like you already have.
maybe change the spill valve/pressure relief valve for hpfp with a known good one to see what happens, seems like you have that in your plans, id go with what your plan is and report back
Yeah, Iíve gotten the ITFP running and pressurized.

Do you know where Iíd get a good spill valve/relief valve/whatever, without buying a new HPFP? Iíve changed the pressure relief valve, that one that cracks open at like 1850psi.
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 Old 04-12-2019, 08:15 AM   #6
 
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If your in tank pump is working, you shouldn't see less than 60ish psi in the rail...unless there is a relief valve that's wide open.
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 Old 04-12-2019, 02:42 PM   #7
 
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Originally Posted by Fstrnyou View Post
If your in tank pump is working, you shouldn't see less than 60ish psi in the rail...unless there is a relief valve that's wide open.
Thatís what was confusing me. I wasnít sure if there was a block before the HPFP or if the rail sensor was bad.

A block/clog in the line makes no sense. Thereís a filter before the ITFP.

I will get the pressure right after the tank measured this weekend.. and I will pull out the relief valve to see if I can blow through it. I can prob blow 4 psi. If it is open, weíll know the problem. Itís brand new OEM and a year old though, so my suspicions lie elsewhere.
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