Trouble with the b6..again

[Leonides2727]

Hey yall looking for some help, as the weather started getting colder I would have some trouble starting my car, it would start and shut off and idle a bit rough once engine got warm I had no issues as it got Colder it got worse so I started putting it in the garage, yesterday tho I went to start it it the garage as normal and it started idling very rough again then about 30 second later the battery light came on and I went to hit the brakes to pull it out the garage and realized I had no power brakes, so I shut it off and opened the hood and serpentine belt came off, not broken but just came off just like that was wondering of anyone had any ideas as to what could have caused this it's a 3.0 btw

[jbain2]

Sounds like maybe a bad alternator.


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[Leonides2727]

Well I've never had the car have electrical problems the shutting off seemed like a fuel problem but I was doing some reading and I've had a lot of power steering pump winning maybe power steering pump went out and pulley siezed causing the belt to come off?

[EuroxS4]

Its either a battery issue or a voltage supply issue/ ie bad alternator. With temps dropping it is common for batteries to act up to show their age/condition. I would check battery voltage with engine running to see if its being charged. But I would suspect you have a bad or failing alternator at the very least.

[Leonides2727]

Well have an update, put belt back on after struggling alot lol but soon as I turned it on Car kept dying and belt came off again, however this time the tensioner is like maxed out, like I put a wrench on it and it barley moves nit enough for me to put belt on

- - - Updated - - -

Could a bad tensioner be the issue to the car running rough?

[shurur9]

Could be the tensioner.
Also push on the tensioner mount bolt...
That bolt has a tendency to sheer over time.

It should be replaced with the tensioner.
You can get a GM alternator bolt for cheaper.

My 3.0 was sawing belts.
I read a bit and sure enough the bolt was nearly sheared. It broke off with a push from my finger.

Belt slipping off could also be a pulley seizing up..

[Leonides2727]

See my power steering has been making noise more so when it's cold I'd say that's the pulling that's bad but now with the tensioner not moving I think it's the tensioner

[EuroxS4]

If the tensioner is the issue it will throw the belt once the engine started. So yeah possible. Note if you have a oil leak and the belt is saturated with oil that doesn't help either. I would spin al pulley by hand make sure you have nothing else going on.

[Leonides2727]

Well I am working on getting it on service position to see the tensioner feel like it's bad because it was releive tensioner making it impossible to put belt back on

[Leonides2727]

Well got it in service position tensioner seems fine, I was able to get it to do what it's supposed belt stil fell off tho and tensioner pulley spins freely is that normal? Wish I could post pics but idk how

[shurur9]

Do you mean that the tensioner pulley moves freely with the belt on?!

That would be a hard no..it should not.

Look you already know the belt slips off when you start the motor, so that part of the investigation is done.

Now you need to look at all the pulleys to see what pulley is seized....after seeing whether there is slack in the belt when the belt is installed...engine off.

The tensioner should take up most slack in the belt.
No pulley should turn on its own with the belt on.

My ac compressor seized up and my belt would slip off...even though some will say that the ac cannot seize...it can.

Then also a slicked up belt or pulley will make the belt slip..but that usually doesn't make the belt slip off imo.

[Leonides2727]

No lol spun while off 😅 dumb statement of me, how will I know which pulley is the issue ?? 🤔

[shurur9]

All the pulleys should turn freely..except maybe the AC..that one I am not sure about.
You could also get a belt delivered from amazon to bypass the ac compressor in order to eliminate the ac. That belt is Not a bad thing to have anyway.

I would post the video that you posted in the ac bypass belt thread in this thread and wait on responses here.

[Leonides2727]

https://photos.app.goo.gl/s6hhBqCxS6Y8XTc28

[Leonides2727]

Thanks man i found an old thread with a Napa pn going to see if I can pick one up today I also may have fixed my rough idle issue cleaned MAF N car sounds better buy I can't Keep it running long enough to make sure

[shurur9]

So I see from the other thread that you used the shorter AC bypass belt and got no belt slipping?

https://www.audizine.com/forum/showt...erpentine-belt

[Leonides2727]

Yep, so far so good I appreciate the help, as to my first problem of it running rough on the 1st start of the day I made no progress I was certain that cleaning the man would solve it but it didn't buy least I have no CEL on, been a long time since my dash has been so plain lol , with my av belt off my heater will still work right?

[walky_talky20]

Your rough idle and lack of brake vacuum assist sounds like a vacuum leak to me. I'm not as familiar with the 3.0, but on a 1.8T a ruptured Suction Jet Pump (or the hose leading to it) is common to cause those specific symptoms. Good Luck.

[Leonides2727]

Jet pump?

[Mike Tries]

Yeah, it's a tiny thing--maybe three inches long with three barbs coming off of it to attach to various hoses. Not expensive. I bought one as part of my maintenance plan on the car a year or so ago, couldn't find the dang thing, and just threw it in a parts bin. I think it's behind the intake manifold, and if I found it last weekend, it was staring me in the face the whole time--super easy to get to.

Edit for clarity: It does not look pump-like at all. Like... picture a pump... it doesn't look like that.

[walky_talky20]

Looks like B6 3.0 does not have a Suction Jet Pump.

But any large vacuum leak could cause similar issues.

[shurur9]

Looks like B6 3.0 does not have a Suction Jet Pump.

But any large vacuum leak could cause similar issues.

Yup...probably time for him to do these mods...
3mm ID silicone hose and 1mm OD cohline..

He has the oem vac lines still..

https://www.audizine.com/forum/showt...ne-replacement

Then
Can't find the 3.0 PCV mod thread right now..the one that uses hoses and brass fittings.

Found it:
https://www.audizine.com/forum/showt...ck-of-manifold

[Leonides2727]

I actually had a valve cover gasket leak last year and decided to fix it while I was on covid quarantine and ended up breaking dam near all those hoses so.i ordered these nice red hose and they didn't come in time so Maybe that will be my weekend project.