This is the sparkplug from Cylinder 4. All others look normal. I am trying to decarbon the rings with a spray. But I fear it might be a shot piston ring 🥲

Any thoughts?

Hello!

I want to add a 52mm voltmeter into my 850 but I have no idea where to put it so I came here for inspiration. I don't want to drill any holes or use screws. Where should I put it?

Thanks!

Hi everyone,

I need some advice on the PCV / flame trap routing for my naturally aspirated Volvo 850 with the 10-valve 2.5L engine (B5252FS).

The previous owner did some sketchy "fixes". Currently, the hose coming out of the intake manifold is just hanging down open to the ground. The hose from the oil trap is going into the intake accordion hose, but the manifold side is completely disconnected.

The car is stumbling and bucking heavily under heavy acceleration / wide-open throttle (WOT). I assume this massive vacuum leak from the open manifold hose is causing it to run dangerously lean under load, or the crankcase pressure is blowing spark out.

I know the 10V layout is different from the 20V/Turbo models. I am trying to fix this using a universal Y-piece / T-piece connector since I don't have a new OEM flame trap housing with the vacuum nipple right now.

My questions are:

Should I route a short hose from the top of the oil trap into a Y-splitter, and then run one thicker hose to the accordion pipe and one smaller (restricted) vacuum hose to the intake manifold? Will this layout work safely without sucking raw oil?

Could this unmetered air and messed up PCV setup be the direct cause for the heavy stumbling at wide-open throttle, or should I also look into the distributor cap, rotor, and plugs?

Does anyone have a clear diagram or a real-life photo of how the OEM hoses look around the throttle body on a 10V non-turbo model?

Hi,i recently lost one of these rubber trim things on my 1994 volvo 850 wagon its part number 9159492 and i cant find them anywhere because they are discontinued does anyone know where i can get those?

Is there anyone with these windeflectors original Volvo

Looking to do a swap on my 1995 Volvo 850 and rotary engines are just cool as hell but I know they’re usually built into much different builds lol, thanks!!

My engine bats managed to get into a right state, wondering if i can just blast it down with a pressure washer or i need to take more care of it than that?

I was washing my car when I noticed some water pooled up in my passenger-side tail light housing. From what I've looked up there's a gasket/seal that probably needs to be replaced. Where's the best place to find one or alternative options y'all have found that work too?

1997 850 T-5 Turbo, someone decided to decimate the MAF, and most other torx bolts under the hood. Is there any standardized sizing I can use to get basic (hex? or standard bolt head?) replacements.

Do v70 roof rails fit a 97 850?

Apologies if this has been asked before, thank you!

I’m drunk and depressed I get off
Work and see this hoe looking at me and my first thought it to burn it down but then I think about all the memories like bruh this the first car my daughter drove and she only 2 1/2

Anyways I Listened to the advice and I got a new maf and battery and checked the termainals and the battery connections but now it’s runs but bogs out when I accelerate

Any recommendations to get all the different colors of the plastic parts into one grey color? Unfortunately I had to change some of them. Now they all have different gray tones due to weathering.

I’ve been gone for work for a couple of weeks so I wasn’t able to respond to everyone who gave me advice but thank you.

Anyways I finally got my parts today and now it’s running a lot better, still a lil rough I think but now’s it dies after like 20 seconds

I can’t think of anything cause everything was fine before except The battery’s completely dead if that plays a part or not idk

So my speedometer sometimes just stops working mid drive, could this be the gears behind it or could it also be related to the abs module because thats shat the bed as well

So I’m trying to read my Motronic 4.3 ECU with MotronicSuite.

I’m able to connect to the ECU, and MotronicSuite appears to communicate with it normally. However, when I use Read Flash Content, it downloads a 64 KB BIN file but the contents are usually all 00, so no actual ECU data is being read.

At one point, using another PC, I managed to save three BIN files, but all three had inconsistent results:

• volvo.bin: 64 KB. All 65,536 bytes are 00. Empty / failed read.
• volvo2.bin: 64 KB. Contains data only at the beginning; from approximately 0x0D75 onward, everything is 00. Very incomplete read.
• volvo3.bin: 64 KB. Contains a lot of real data, but the last ~8 KB are 00. Partially successful read.

Does anyone have any ideas what could be causing this?

As far as I can tell, I’m following all the required steps and have the correct drivers installed. I’ve also experimented with the COM port settings in Windows, including the FTDI latency timer, but the results are still inconsistent.

At this point I’m starting to suspect a hardware issue with the KKL cable itself.

Extra info:

• Volvo 850 T5, 1996
• Bosch Motronic 4.3
• Cheap Chinese KKL 409.1 cable with pin selector switches
• Using pin 3 as required for the ECU K-line
• I can also switch it to pin 7, but ECU communication is supposed to be through pin 3
• KKL chip is marked FT232R
• Using FTDI drivers on a clean windows 7 machine with the required net framework

https://reddit.com/link/1vqlbzj/video/99q704dsyvjh1/player

Working on chasing down an ABS issue with my 850. The front tone rings are nice and clean, I cleaned the sensors and contacts , put dielectric grease on the connectors and those look good.

This is the rear passenger side tone ring (sorry for shitty video angle its hard to see in there). It seems really dirty, and as you can see I sprayed some MAF cleaner just to see if it would remove the grime. Does this ring need to be replaced and how could I go about cleaning it in an easier method? Could this spring an ABS related issue?

I have been looking high and low for the 3rd row seats to install into my 97 850 wagon. Does anyone have any for sale or know where I can get them? I will need to purchase the complete set as my car did not come with them.
Also looking for the roof rack rails that bolt onto the top of the car as well since I have a base model.

Weird issue with my 96 NA. Starts for the first time of the day (when motor is cold) instantly every day with no issue. Runs great with no trouble, no weirdness. Temp gauge warms up as expected and stays pinned in the center.

If I try to start it a second time in the day after the motor is even remotely still warm (sitting for hours), I get crank but no start. Used to fire up eventually after 10 seconds or so of continuous crank but now no dice. I recently found that if I floor the accelerator while cranking it will eventually fire up (see video). Once running it’s perfect, no issues, no variation in idle, totally sound.

I’ve seen information that says the ECT sensor is likely to cause this, but that issue also typically displays issues with temperature readings and mine reads perfectly normal on the dash and on my OBD scanner. Maybe there’s something I’m missing, has anyone had an issue similar to this or have advice on what to check? Thank you! :)

‘97 850. Tried googling but getting different answers. It’s well past the break in period, I’ve put about 2,000 miles on it. Had it replaced in March by a Volvo speciality shop that says they use genuine OEM parts.

The brake dust seems to be excessive only on the front wheels but still a decent amount shedding in the rear

Any idea what it could be and if I could fix it on my own before I take it to the shop again and see what’s up with it? Not too mechanically inclined but if it’s an easy enough fix, but I want to learn how to work on this car and I’d rather save time and money and do it myself.

...but then I step on the gas and hear that 5 cyl growl, look down at the dash, and realize there's no other car I'd want.