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P2/P80 Visual Audible Tactile Inspection of vacuum hoses VATHI

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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abscate
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P2/P80 Visual Audible Tactile Inspection of vacuum hoses VATHI

Post by abscate » Fri Dec 23, 2016 1:29 pm

When we encounter poor running or starting, a common cause is corruption in the vacuum hoses in these cars.

Commonly, these throw codes for oxygen sensor, MAF, misfire, or fuel trim out of range.

You can't just look at your hoses to rule them out, I've found again and again that you need all your senses to make sure you don't have leaks.

I had $1300 of work proposed by BMW to cure P0171 and P0174. It was clear no one was diagnosing, they were just Mossberg Mechanicing....shotgunning a ton of expensive parts.

I knocked off the induction in about one hour..it's a pain on this car

Here's is the intake bellows in installed position
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Slight pressure on the idle valve bypass
IMG_0605.JPG
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Re: P2/P80 Visual Audible Tactile Inspection of vacuum hoses

Post by sleddriver » Fri Dec 23, 2016 1:44 pm

Nice catch! Did they even bother to smoke it? As complicated as modern cars are, a smoke tester is necessary these days for saving time. I should have built mine 10yrs ago.


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Re: P2/P80 Visual Audible Tactile Inspection of vacuum hoses

Post by abscate » Fri Dec 23, 2016 4:10 pm

I built a crude one but decided I would strip it down before I bothered to smoke it. This car, the E83, is known for bad bellows so I knew to really give it the evil eye.


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Re: P2/P80 Visual Audible Tactile Inspection of vacuum hoses VATHI

Post by abscate » Thu Jul 20, 2017 7:30 am

Here are picture details of my smoke tester

Cat litter bucket
CA sage smudge sticks
Clay
pot
Tygon (tm) tubing aka PVC tubing
Brass air fittings
Air compressor - not shown. you just need bit of air flow, you can probably blow to make this work. The side PVC hose blows right onto the smudge to make it glow, then it will puff off thick smoke.

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Re: P2/P80 Visual Audible Tactile Inspection of vacuum hoses VATHI

Post by MrAl » Thu Jul 20, 2017 5:21 pm

Hello Steve,

Nice pics. I have almost that same meter, the 2108 not the 2108A. I have a Mastech bench meter also.
What are you measuring with it though there, i see about 64k Ohms. What is that for?

Is it hard to smoke test the system? Like where do you hook up the smoke injection hose?

A little off topic, but did you ever measure the engine cranking Amps with that meter?


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Re: P2/P80 Visual Audible Tactile Inspection of vacuum hoses VATHI

Post by abscate » Thu Jul 20, 2017 6:47 pm

That last picture sneaked in there from a AbS test procedure on the module. I haven't figured out how to test hoses by meter yet

:-)

You can tape the Tygon tube nicely to the brake booster, on the suction side of the check valve


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Re: P2/P80 Visual Audible Tactile Inspection of vacuum hoses VATHI

Post by MrAl » Mon Jul 24, 2017 4:16 pm

Hi,

Ok thanks, i'll have to locate that next i guess :-)


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1998 v70 on the road since April 2nd, 2015

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Re: P2/P80 Visual Audible Tactile Inspection of vacuum hoses VATHI

Post by abscate » Mon Jul 24, 2017 8:06 pm

Big fat hose heading to the brake booster


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Re: P2/P80 Visual Audible Tactile Inspection of vacuum hoses VATHI

Post by MrAl » Tue Jul 25, 2017 5:40 am

Hi,

Thanks, i'll look for that when i go out there again.
I am assuming that smoke does not harm the system?
Does anyone use soapy water for this kind of test?


I’ve been driving a Volvo long before anyone ever paid me to drive one.
1998 v70 on the road since April 2nd, 2015

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abscate
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Re: P2/P80 Visual Audible Tactile Inspection of vacuum hoses VATHI

Post by abscate » Tue Jul 25, 2017 8:02 am

Most people will keep smoke out of the MAF by pulling off the big snorkel hose and putting a baggie over it. Thats probably smart. Any leak before the MAF doesn't matter , of course.


1 SWMBO for 30 years
2 Volvos
3 VWs
4 Careers
5 cats/dogs/gears
6 Perfect Ladies in waiting
7 Drivers
8 Boats- with a big pointy metal thing on top

1999 V70 T5M 56 2005 V70 NA M56 VWs BMW

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