It would be interesting to know what your old O2 was reporting. Mine had been reading very low, so the computer was over fueling the engine trying to compensate for a false lean condition. I havent been able to pull live data, but I suspect it was the same issue as it did make the engine run very r...

For whoever is reading this troubleshooting their own idle issues: if it runs just as bad with or without the O2 connected, its probably your O2 (lambda) sensor. My problem has been resolved with a new Bosch unit. Still has some slight idle issues but it actually runs now, I suspect my MAF is also p...

I recently read a brochure for 850,online,made for Dutch market only. It might be it. Something like 2.0 T5 R made for Italian market only. One thing is for sure...i have never seen or came across a '96 with VVIS and LH 3.2 Jetronic management. '92-'95 yes....but no '96. I can confirm it is indeed ...

VVIS on a 1996? We didn’t get that system over here in that year. Could your engine have been swapped? It seems that engine has been swapped. No VVIS on a EU market from '96. According to this wikipedia page, this might acually be the original B5254S engine, equipped with V-VIS and available on the...

How about getting live data on some of those sensors..... TPS would be good to know. I measured the resistance on the (disconnected) TPS as noted in my earlier post. After some research it seems good, it matches up with the values others have posted. There's no drop anywhere on the rotation either....

I think I'll just bite the bullet and buy a new O2 sensor, everything points mostly to that so far. It would make a lot of sense.

ECT is good. I checked my TPS, which seems to be a bit off. It doesnt 'click' (removed from the car), as described by some and it also reads 900-2300ohms, while the Bosch spec sheet specifies it should go from 710 to 1380 (see attached). There's also quite a bit of play/wobble between the turning me...

If you haven't already had a chance to do this, it would be a good idea to check the engine coolant temperature sensor, wiring and connectors. Thanks! I will stick a multimeter on it. I didn't suspect it since my fan is only activated when the engine reaches operating temperature, but it might be g...

abscate wrote: ↑16 Jun 2022, 04:35 VVIS on a 1996? We didn’t get that system over here in that year. Could your engine have been swapped?

I think it's an early 1996 just before they changed it. It's a European car, market was probably a little bit different

ETA: I also replaced the rotor, rotor cap, spark plugs (Volvo OEM) and airfilter. Didnt suspect these anyway since it runs good in limp mode. I have VIDA 2012D and a DICE, would I be able to diagnose the 850 with that, or is the car too old? Just reading up on this: https://www.matthewsvolvosite.com...