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98' V70R running wildly rich!

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.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

BenedictD
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Year and Model: 1998 Volvo V70R
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BenedictD

98' V70R running wildly rich!

Post by BenedictD » Thu Apr 04, 2019 3:57 am

Hello Matthews Volvo world. I am Ben

I have a 98 V70R, it has ran flawlessly the last 3 years. Some light mods, and maintaining it pretty religiously but she has me pretty confused.. about 3 months back I was driving it home from work nice and easy on the highway, and I noticed the wideband hitting about 16-1, extremely out of the ordinary.. so I just took it nice and easy the remaining 15mins home, no engine light as yet. Being curious I took it for another drive to see if I a check engine light would pop up, and about 10mins in I got the engine light I was waiting for, P0130. So I ordered a new OEM sensor as I had done roughly 100k in the car since buying it anyways. And checked for vacuum leaks, couldn't find any leaks at all inspecting and spraying brake cleaner all over the place :cry:
So after I stalling new O2 sensor I drove the car for a day or 2, still running rich, stuttering a little decellerating nearing a stop, not getting into closed loop at all..
Since this I have installed a new OEM MAF sensor, cleaned out the PCV, cleaned idle control valve smoke tested the car twice and cannot seem to find a vacuum leak anywhere! Fuel pressure is also holding solid just over 3bar.
For the most part the car starts up perfect, cold or hot. Then after running approximately 6-8 seconds the AFR's will drop to 10-1 at idle, but in saying that it can be rather Intermittent, disconnecting the battery overnight to make sure the electrical system is fully discharged the cat can start up and idle about 12-1, then go back to almost normal.. using the torque app to monitor the O2 voltage is sweeping spot on and AFR is 14.7, then a couple minutes the O2 sweep starts dying off to ultimately flatline and car is back to super rich.. kind of running out of ideas as to why this can be. Ant help is greatly appreciated! P.S also has new coolant temp senor



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abscate
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abscate

Re: 98' V70R running wildly rich!

Post by abscate » Thu Apr 04, 2019 4:18 am

That does sound like a classic induction leak. I would take off every single piece of induction path and look for splits and small leaks. You might have to remove the inter cooler and pressure test it to find a split Or subtle break.


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BenedictD
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Joined: Thu Apr 04, 2019 3:32 am
Year and Model: 1998 Volvo V70R
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BenedictD

Re: 98' V70R running wildly rich!

Post by BenedictD » Fri Apr 05, 2019 1:48 am

I had smoke tested the entire inlet/charge pipes and intercooler on two occasions and didn't find a single thing wrong. But yeah I'm thinking I might pressure test it also . See if somethings up. The worst part is that it can be intermittent. Sometimes behave perfect for a few minutes, then just turn rich, I would have thought a vac leak would be a constant thing



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