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Can't Find My Vacuum Leak, Help? (Pics)

Jo33

By Jo33,
in Engines & Forced Induction

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Jo33 Rookie

Jo33

Posted
Posted (edited)

Hey guys, I've had a vacuum leak problem or what I think is a vacuum leak problem for quite some time. My engine sometimes hunts, mostly when I take the key out and the turbo timer kicks in. One time I drove out the carwash and my engine was hunting real bad almost cutting the engine and when I put the foot down it just went CHUG CHUG CHUG and struggled to get up to speed with ALOT of fuel spitting out the back. I've ziptied alot of the small hoses coming out of the intake manifold(A 4mm or 6mm line on the back of the manifold allowing my gauge to read something and all hoses that size out of the manifold). I've only worked on marine diesel engines so I have no clue what to look for or what i'm even looking at too be honest haha.

Here's what my gauge reads normally and I would think its meant to be right down on the -7? I'm not 100%

cKrHw.jpg

Also i've found these stains on this hose coming near the front of the manifold, the side closest to the rocker cover but I never realised fluid even went into the intake manifold but there is a tiny coolant leak around this area somewhere too I can see a few drops on the block underneath it.

lMDmt.jpg

And this screw here(Pipe leads into my radiator) is damaged and not tight but again I don't know if it's even a problem

ZoxQD.jpg

If anyone could help me i'd be extremely thankful as I have a feeling i'm losing boost pressure due to this aswell and my fuel consumption is effected.

Thanks!

-Joe

EDIT:

Edited by Jo33
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StevenCJR31 Veteran

StevenCJR31

Posted
Posted (edited)

sounds like a few problems you have there! the car wash misfire sounds like water on the ignition system, have a look at your coils and plugs and check if water is / has gotten in there

Edited by StevenCJR31
The Dan Grand Master

The Dan

Posted
Posted

That earth wire is the main ECU earth. VERY important

Also clamp off the big tube that goes to idle air control. The engine should stall. If it doesn't, you've got a vacuum leak at the charcoal canister. Delete it to diagnose

GTSBoy Grand Master

GTSBoy

Posted
Posted

Lookin gat your vacuum/boost guage......that is a completely normal idle vacuum. You will never see -700mmHg. Usually halfwayish between 350 and 700.

The coolant is normal. There is a coolant blled screw right there (I think it's the 10mm one on the edge of your circle. Open it to bleed, coolant drops out. Normal.

Jo33 Rookie

Jo33

Posted
  • Author
Posted

Lookin gat your vacuum/boost guage......that is a completely normal idle vacuum. You will never see -700mmHg. Usually halfwayish between 350 and 700.

The coolant is normal. There is a coolant blled screw right there (I think it's the 10mm one on the edge of your circle. Open it to bleed, coolant drops out. Normal.

Thanks for clearing that up, I've never seen boost pressure measured in mmHg always psi or bar so I didn't know what to expect.

Thanks for all the tips guys once I get home tonight i'll pick up all the gear I need on the way home and hopefully the hissing noise and hunting stops :D

gotRICE? Veteran

gotRICE?

Posted
Posted (edited)

It may have something to do with the turbo timer. Try leaving it idle without the timer on. Just leave key on. If it doesnt happen then its the timer

Id agree with that too. The turbo timer in mine used to make the car revs dip every time it beeped as it counted down. Never figured out why and couldnt be bothered unwirng it so just turned it off and hid it haha.

Edited by gotRICE?
The Dan Grand Master

The Dan

Posted
Posted

Id agree with that too. The turbo timer in mine used to make the car revs dip every time it beeped as it counted down. Never figured out why and couldnt be bothered unwirng it so just turned it off and hid it haha.

It's called cheap install

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