2nd Generation Specific 1986-1992 Discussion

Primary Fuel Rail

Old 02-21-2004, 10:15 PM
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I heard that the s5 primary fuel rail is much safer than the s4 as the PD normally doesnt break on the s5. I got the s5 rail put on the car but now the car stalls at about 1200 rpm. Do I have to ajust the mixture for the new fuel rail? I also hear a loud hissing sound from the intake manifold. I cant find any vacuum leaks. Any idea what could cause this?



Thnx

Andy
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Old 02-21-2004, 11:24 PM
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Hissing from the intake manifold



sounds like a vaccum leak to me.



That could be why you are dying at 1200. Your motor is getting too much air and it can't compinsate that by adding fuel since the air ins't being measured through the AFM. So in other words, lots of air + no fuel = no run
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Old 02-22-2004, 12:13 AM
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I cant find any obvoius leaks. Ill check again though. Any other Ideas?

Thnx

Andy
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Old 02-22-2004, 10:26 AM
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shoulda just got a new pd for your rails.



with s5's you have to replace the whole rail to replace the PD when it goes out, which is why ive had a leaky PD forever, i dont feel like replacing the whole rail to fix it.



i was trying to switch to s4 t2 rails forever but now ive got a full custom fuel setup going in so thatll fix those problems.



kevin.
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Old 02-22-2004, 10:41 AM
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Is there a generic PD you can buy anywhere and adapt it? I don't feel like spending like $150 on a stock FC PD..
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Old 02-22-2004, 11:02 AM
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Originally Posted by ColinRX7' date='Feb 22 2004, 08:41 AM
Is there a generic PD you can buy anywhere and adapt it? I don't feel like spending like $150 on a stock FC PD..
a lot of other mazdas/hondas/acuras use the same damper
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Old 02-22-2004, 11:06 AM
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Originally Posted by teknics' date='Feb 22 2004, 12:26 PM
shoulda just got a new pd for your rails.



with s5's you have to replace the whole rail to replace the PD when it goes out, which is why ive had a leaky PD forever, i dont feel like replacing the whole rail to fix it.



i was trying to switch to s4 t2 rails forever but now ive got a full custom fuel setup going in so thatll fix those problems.



kevin.
its 7 bolts in total to replace the primary rail bro





2 on the rail....5 to get the uim off
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Old 02-22-2004, 11:14 AM
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Originally Posted by FrestyleFC3S' date='Feb 22 2004, 12:06 PM
its 7 bolts in total to replace the primary rail bro





2 on the rail....5 to get the uim off
yea but the price of replacing the whole rail just to replace the pd is higher then i look to spend. id rather save it and spend it on my new rails.



kevin.
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Old 02-22-2004, 11:17 AM
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Originally Posted by j9fd3s' date='Feb 22 2004, 09:02 AM
a lot of other mazdas/hondas/acuras use the same damper
sweet



just to clarify I'm talking s4...
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Old 02-22-2004, 08:22 PM
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I heard that the PD on the s5 pretty much never goes and the s4 was practically guaranteed to go. If not, maybe Ill just go back to the s4. I dont know what the fuel rail could do to the intake but thats my only guess.

Thnx

Andy
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