xDJ DUBx's 03.5 Pure White LX-T

[Wagonbacker9]

put on a boost/vac gauge... if it reads higher than about -21 at idle, you have a leak.

 

[GiJoe]

get a bottle of windex or soapy water and spray it on all vac lines, while your there, might as well clean the engine bay. lol

 

[Wagonbacker9]

get a bottle of windex or soapy water and spray it on all vac lines, while your there, might as well clean the engine bay. lol

you're thinking boost leak... which is a similar, though more difficult problem to diagnose.

 

[xDJ DUBx]

I have a boost/vac gauge. when you mean higher, do you mean like -25 or -15? lol. The negative part makes it confusing to how you mean higher.

 

[ucMP3]

get a bottle of windex or soapy water and spray it on all vac lines, while your there, might as well clean the engine bay. lol

you're thinking boost leak... which is a similar, though more difficult problem to diagnose.

Y wouldn't this work for a vac leak? I've watched people do it b4...

 

[Wagonbacker9]

I have a boost/vac gauge. when you mean higher, do you mean like -25 or -15? lol. The negative part makes it confusing to how you mean higher.

mathematically above -21... so if the most vac you read is -15, you have a leak.

Y wouldn't this work for a vac leak? I've watched people do it b4...

because it would just get sucked into the IM... you wouldn't see the bubbles or anything like if the air were pushing out.

 

[J_Naoto]

when you hit fuel cut, youll know. only happens to me in the rain when the maf gets wet

 

[ucMP3]

Hmm, makes sense. But I've watched it successfully done on cars without boost. idk

 

[GiJoe]

I have a boost/vac gauge. when you mean higher, do you mean like -25 or -15? lol. The negative part makes it confusing to how you mean higher.

Think back to your math classes... which is a higher value.

Y wouldn't this work for a vac leak? I've watched people do it b4...

it's harder to see. pressure issues.

 

[xDJ DUBx]

I know that -15 is higher than -21 but I didn't know if carl was being mathematically correct or not.

 

[Wagonbacker9]

Think back to your math classes... which is a higher value.

he was asking if I was meaning higher in absolute, or relative reference... its a fair question, I was unclear. leaking vacuum would mean you have less of it... aka closer to 0.

 

[xDJ DUBx]

Ninja'd, ****.

 

[Wagonbacker9]

as was I... lol

 

[xDJ DUBx]

-20 vac during idle.

 

[Wagonbacker9]

sounds like thats solid then...

 

[xDJ DUBx]

Pushed it hard today, no cut like yesterday but it is a bit warmer.

 

[Wagonbacker9]

well there you go, don't push it when its cold. lol

 

[xDJ DUBx]

lol. Gheyyyyyy

 

[MakeMeGoFast]

OK so I'm kinda oblivious to the way of the turbo but I have a question? Irealize its not specific to turbo but it always comes up with the MSP

What is the purpose of fuel cut and why does it happen. I get it limits what the engine can do as a "safety" precaution (i think) but would fuel cut go something like this fuel cut-->less fuel-->lean afr-->hotter combustion temps--> hotter engine-->s*** goes boom.

Or am I missing something?

 

[Wagonbacker9]

OK so I'm kinda oblivious to the way of the turbo but I have a question? Irealize its not specific to turbo but it always comes up with the MSP

What is the purpose of fuel cut and why does it happen. I get it limits what the engine can do as a "safety" precaution (i think) but would fuel cut go something like this fuel cut-->less fuel-->lean afr-->hotter combustion temps--> hotter engine-->s*** goes boom.

Or am I missing something?

its a protection mechanism, the car doesn't believe it has enough fuel delivery capacity to keep up with the amount of air being forced in, so it shuts off combustion all together.