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Rb25det issues, :( help

RYanR31

By RYanR31,
in Engines & Forced Induction

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benm Grand Master

benm

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My first suggestion would be to have a very good close look for leaking vacuum hoses and fittings.  There are lots, so take your time, a small split in the underside of a hose is hard to see if you rush.
Slightly off topic: Is their something I can spray/do to the hoses to see if their is a vacuum leak? What is the easiest way to find a vacuum leak?

I can hear a soft hissing near the fuel regulator which sounds like a vacuum leak that i've never heard in the last 18mths.

Sydneykid Grand Master

Sydneykid

Posted
Posted
Slightly off topic: Is their something I can spray/do to the hoses to see if their is a vacuum leak? What is the easiest way to find a vacuum leak?  

I can hear a soft hissing near the fuel regulator which sounds like a vacuum leak that i've never heard in the last 18mths.

Soapy (dish washing liquid) water is good, if there is a boost leak it blows pretty bubbles :flower:

For a vacuuum leak, try some RP7, the engine will suck it in and the idle rpm will jump. :)

RYanR31 Enthusiast

RYanR31

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hmm...i am having over boosting problems with the stock boost solinoid, hits 10 most times, whats going on? could a hose be ****ed? or is it the solinoid? when it hits past 7 is when it starts the flat spot pretty much... also the flat spot goes away after bout 6 grand because the boost goes back down to 7. ..real wierd...any thoughts?

  • 2 weeks later...
deano_82 Collaborator

deano_82

Posted
Posted

ok fellas after being annoyed for a while

we got energetic last sunday and borrowed a mates 33 in top running order

we changed plugs,packs, fuel pump, ecu, fuel regulator, fuel return valve, blew out the fuel lines, afm, air filter, o2 sensor, coil pack modulator, adj cas, checked tps

we tried clamping the fuel line which jumped me up 30 odd hp so we were obviously getting to much fuel, we adj timing and bingo no more missing although thereis still a huge hole in the power which is soon to be fixed with safc. but we figured that timing belt is screwed and has jump a tooth or something so i am going to do 100k svce next week, and replace cam gear whiile i'm there. lucky we have access to a dyno so did it on the cheap

started out with around 128-130 rwhp endedup with 195.5rwhp.

looking for around 240-250 with fmic safc and cam gear!

SeriesIIGTST Mentor

SeriesIIGTST

Posted
Posted

one other thing to check is do a simply diagnostics test via consult plug. I had a very nasty hole (to the tune of about 80RWHP) at 5,500 - 6,500 due to my knock sensor (Code 34) not being connected properly and my stock ECU retarding my ignition levels to safe amount, then all of sudden, power jumped back up again, all with consistent A/F's and boost levels. Plugged in the knock sensor, reset the ECU and been happily boostin ever since. Go the S-AFCII :cheers:

  • 11 months later...

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