Greetings from germany and a question about high idling my V70R

[Hamburger]

Thanks Mat!

Nope, here in Germany Cat's aren't avaiable at all, or for 2.5k€ which i'm not spending.
Donor V70R's are as rare as the cats avaiable...
i ordered the downstream O2 Sensor, in worst case to confirm the useless cat, we will see.

There are Cats avaiable from TME (around 1000€), but without any paperwork or homologation for the legal use here in Germany, so in Case of TÜV i will get far away from that with a defect cat.

[850 LPT]

Moin Alex,

Leider kann ich dir nicht helfen. Man koennte ja einen Cat von hier schicken, aber das waehre wohl ziemlich teuer, und was der Tuev dazu sagt, weiss man ja auch nicht.

Trotzdem schoene Gruesse von der anderen Seite des grossen Teichs.

Dirk

[Hamburger]

Moin!

Mittlerweile hätte ich eine Alternative aufgetan - jedoch immer noch knap 1k€... ich schaue mal.

Ebenso wurde mir ein Volvo Spezialist hier in Hamburg empfohlen, bevor ich weiter ins blaue rate werde ich den mal konsultieren.

Gruß - Alex!

[Hamburger]

Morning,

i swapped the downstream O2 Sensor and checked the cat with an endoscope, looks good.

Results stays the same, i'll ask the local volvo specialist. Thought i could handle this problem myself, but nope, not this time

If there are any news according to this problem, i'll share them here.

On the other hand, i got the time now to do the front suspension, motormounts, rear shocks etc... trying to be optimistic.

[jonesg]

cats can develop holes where the hanger bracket is welded to the case body.
i pulled mine and welded up all the holes, confirmed on the bench with compressed air and soapy water.
the flex pipe was also rusted out and i welded in a new one.
you can detect the holes with the system on the car by blocking off the tailpipe with tape, poke a hole and apply 15 psi air pressure, then spray soapy water on the welds.

[Hamburger]

Hi,

easy to check since the R is on the lift. I'll check and come back with a result.

[vtl]

cats can develop holes where the hanger bracket is welded to the case body.
i pulled mine and welded up all the holes, confirmed on the bench with compressed air and soapy water.
the flex pipe was also rusted out and i welded in a new one.
you can detect the holes with the system on the car by blocking off the tailpipe with tape, poke a hole and apply 15 psi air pressure, then spray soapy water on the welds.

Yep, must be holes-free all the way to the downstream H2OS sensor. Gas flow inside the channel creates static pressure drop, fresh air gets sucked in, registers with HO2S sensor and obscures the feedback loop.

[Hamburger]

Greetings,

I checked the whole area first with smoke, then compressed air at approx. 1-1.2bar, then soap. No holes to be found.

I chased another thougt, unplugged the knock sensors just to confirm that they don't affect my enginge, no difference withought em high idling my engine.

[vtl]

What's your fuel trim values? STFT, LTFT.

[firstv70volvo]

Greetings,

I checked the whole area first with smoke, then compressed air at approx. 1-1.2bar, then soap. No holes to be found.

I chased another thougt, unplugged the knock sensors just to confirm that they don't affect my enginge, no difference withought em high idling my engine.

I'm wondering if you may have an internal air leak into the intake manifold, something you may not see with a smoke test. There's the vacuum hose that goes to the turbo bypass diaphragm, the hose that goes to the evap purge valve, a large hose to brake booster and the small PCV system vacuum hose. To check you could remove the hoses and cap off the manifold connection or use pinch pliers on the hoses while doing you do the rpm testing. For the PCV hose you could just remove the oil filler cap to make sure there's not excessive pressure in the crankcase that may cause more air flow through the small PCV hose. Maybe a long shot but shouldn't be too difficult to check out.

Volvo vaccum hose diagram.jpg (56.6 KiB) Viewed 1022 times