MK4 Jetta/VAG 1.8t help

"Justino6969" (justino6969) 03/24/2014 at 20:24 • Filed to: None

0

6

So I installed a boost gauge in my 2001 Jetta 1.8t today. While I was in there, I noticed I had a line broken. I don't know how long it's been like that, or if I did it today, so I started the car and it ran fine. My new boost gauge read 6 psi max and averaged around 5. From what I've read, it's supposed to be around 8, so I'm not sure if that is a side effect from the broken line. The vacuum reads 20 inHg which is normal. The red dotted line is where the broken line goes (under the intake manifold) and attaches from the front of the head (clueless me) to the object circled in yellow (also under the intake manifold, I have no idea what it is). The line is broken where it attaches to [yellow]. Sorry if this is at all confusing, I have no idea what the line is for, or what it attaches to/does. Any help would be appreciated.

In summary: Broken vacuum line, car seems fine, should I be afraid to drive it?

[Picture not my car]

Zipppy, Mazdurp builder, Probeski owner and former ricerboy > Justino6969 03/24/2014 at 20:37

0

Did you check if there's any pressure or vacuum, coming from the hose? it shouldn't affect the safety of the vehicle, or the integrity of the engine, it'll probably be a bit down on power.

Justino6969 > Zipppy, Mazdurp builder, Probeski owner and former ricerboy 03/24/2014 at 20:42

0

No I haven't, but that's a good place to start. Mostly I want to know what the [yellow] thing is, so I know what system the line is a part of.

smashthegas > Justino6969 03/24/2014 at 20:46

1

Under the cover is a few vacuum/boost operated sensors that control the wastegate and recirc/BOV. Try not to go into boost until you fix it. If it's a small leak, it'll just idle funny and might throw a lean mixture CEL.

beardsbynelly - Rikerbeard > Justino6969 03/24/2014 at 20:50

1

fix the hose. Sounds like it's your crankcase breather hose.

you'll see a drop in boost pressure if that's not working properly. The n249 is also on that black bracket, so if the vacuum hose for that is leaking you'll see boost pressure drop.

Justino6969 > beardsbynelly - Rikerbeard 03/24/2014 at 22:06

0

It's nothing major like the breather hose. The line is maybe 2mm ID. I'll have to research what all is on that bracket.

the duckk > Justino6969 11/01/2014 at 17:10

0

that small pipes in question, is the vacuum pipes rhat control your cruise control or speed control and has got nothing to do with your boost drop off valves etc. The worst it can do is affect your idling a bit but you wont see perco ance issues because of thar two small hoses.