Vacuum Issue's and understanding why it's happening ?

[Turbo Habanero]

Ok so the last couple days it has been extremely humid where i live 90% or more which is very uncommon here normal year round is about 0-15%

Ever since the rain has started and the humidity has increased my car has started running very rich and pulling less Vacuum at idle and driving.

Vac
Normal 19-20 @ idle 24-25 normal driving
Recently 14-16 @ idle 20-21 normal driving

AFR's
Idle 14.7-16.4
Under Boost (17psi drops to 15psi) 10.1-10.5 before the Vacuum change i would hold 10.8-11.2 AFR'S


At first i figured i lost a Vacuum line or had a hole in a coupler or a loose pipe but after using a boost leak tester and filling it to 30psi and finding no leaks today it leaves me confused to why my Vacuum has dropped and my is running more rich.

I've also bought 15 feet of vac line and replaced all the lines and clamped every single one down and checked that my timing was still at 10 degrees

Also I have No engine codes



Thanks for any info or thoughts in Advance Jordan

 

[jetjock]

Unrelated...

 

[Turbo Habanero]

Unrelated...

Good to know.

Also since i am on the stock ecu with nothing to tune.

I tried to mess with the AFPR a little but it didn't seem to help much so as of right now i'm at 36psi with the vacuum line off. I did notice that i when i set it at 36psi and came to check it after a drive the pressure was now close to 40psi both times i adjusted car was at operating temps

 

[IndigoMKII]

Have you checked mechanical timing?

 

[Turbo Habanero]

Have you checked mechanical timing?

Do you mean did i make sure the cans and crank lined up?

 

[IndigoMKII]

Do you mean did i make sure the cans and crank lined up?

Yep.

 

[Turbo Habanero]

Just checked that everything was correct and all is good there.

 

[jonahs_supra]

vaccum leak

 

[Turbo Habanero]

vaccum leak

Could a pre turbo exhaust leak be a culprit?

 

[jonahs_supra]

hmmm im not sure what it does to vaccum but a pre o2 sensor leak causing rich conditions

 

[IndigoMKII]

So you've boost leak tested the system and double checked all vacuum lines. Last few things I could think of to try and find it would be compression test to see if you've still got a healthy engine and smoke test your vacuum system.

 

[Turbo Habanero]

I guess ill do a compression check.

My last compression check was about 2 weeks ago and everything checked out great.

I'm pulling about 17-18 vacuum at idle today.

 

[IndigoMKII]

I guess ill do a compression check.

My last compression check was about 2 weeks ago and everything checked out great.

I'm pulling about 17-18 vacuum at idle today.

Problem is getting worse over time, something is going to let go.


Mine's acting stupid today too, backfiring black smoke along with a stupid ass idle issue.

 

[IJ.]

Air cleaner?

 

[Turbo Habanero]

Only issue i'm having is a intermittent Miss under boost.

when this miss happens it sounds like a steady miss all the way through boost other times it wont happen at all and pull clean. The miss is very Audible through the back of the exhaust.

No smoking at all not on start up or under boost or idle.

I'm not sure what detonation sounds like but i've heard it more of a metal on metal ping noise and would be audible from the engine. I only say this because i read in other threads that my car will be more prone to detonation because my head is shaved under factory min.

To me its seems like spark blow out (NGK BK7RE .028) or maybe to much fuel i've heard the same noise come from my car when my FP was to high also it happened before when a Vacuum line came off under the intake Manifold causing the FPR not to get Vacuum.

My Tps is also throwing all kinds of F up'ed Voltage according to my AVC-R but no engine codes it likes to read 36% throttle when i'm not touching the gas.

 

[Turbo Habanero]

from everything i've read and listened to for the past 20min or so what i'm hearing is not detonation. I guess i'm getting bad spark. I need to replace some things anyhow just gives me a reason to do it

 

[IndigoMKII]

Mine's from having stock everything else but a walbro 255..

 

[Turbo Habanero]

Mine's from having stock everything else but a walbro 255..

I am running very rich

Fuel mods i have

Single 255
Evo 8 560cc and a Lex AFM to go with it
Aeromotive AFPR set at 36-37psi without Vac line plugged in. (Eliminated J-Tube)
Nothing to tune AFR

 

[jonahs_supra]

i would fix known issues
buy a safc or something to tune your afr's

 

[Turbo Habanero]

i would fix known issues
buy a safc or something to tune your afr's

SAF-C is gonna have to wait for a bit.

and i'm getting a new TPS Wednesday.