850 Non-Turbo ECU/ECM Replacement

[ShahinS]

Zoom it and you will have ALL of the details & info you need:
http://www.ebay.com/itm/Volvo-850-S70-V ... 74&vxp=mtr

Cheers!...

[ShahinS]

Update...

They shop couldn't find the correct ECM here in the west coat, cause my car is a Midwest car, so it does not have the all the emission stuff on it (Secondary Air, EGR & Pulse Valve).

They told me that they did put a new Bosch MAF sensor, and the flow was fluctuating from like 30 to 90 (normal at idle is 14), they swap the ECM with one in the shop, and then it was reading it constant. That is how they come to the conclusion that the ECM was bad. He put my original ECM back in there, and told me that it is running rich at idle because of it, and because the ECM is reading incorrect info from MAF then it is throwing the front O2 crazy, and that is why I was getting O2 code and also MAF sensor code. The car is running fine thu, no hesitation or abnormal behavioral.

Seems like that my mechanic did all he could, he refund me the money for the part that he couldn't find, and now I am looking to see if this is all makes sense, should I start looking for a used ECM, or should I get a 2nd opinion?... or should I just drive the car like this for now...

Here is my ECM part number:
0 261 204 224 with the FD.2 on the right side, which indicates Federal?

Any suggestion is greatly appreciated!.... Cheers Guys!

[misha]

...Here is my ECM part number:
0 261 204 224 with the FD.2 on the right side, which indicates Federal?

Any suggestion is greatly appreciated!.... Cheers Guys!

Well....0 261 204 224 is Motronic 4.3('96-'97) with automatic transmission & obdII diagnostic.Volvo number(according to my document) should be *12 70 416* or *91 86 161*.

You should find replacement ecu with exact the same Bosch numbers(0 261 204 224).

For more accurate results...ask your mechanic for those codes,write them down & post them here.

Something is NOT right here.

[ShahinS]

Here is a photo of it.

[ShahinS]

Well....0 261 204 224 is Motronic 4.3('96-'97) with automatic transmission & obdII diagnostic.Volvo number(according to my document) should be *12 70 416* or *91 86 161*.

You should find replacement ecu with exact the same Bosch numbers(0 261 204 224).

For more accurate results...ask your mechanic for those codes,write them down & post them here.

Something is NOT right here.

What you mean by "Motronic 4.3", my car is automatic and has OBDII

Thanks again misha, to answer your PM, yes the car was running fine, so I thought that it was just an O2 sensor. It is running fine now too, idles ok, pulls and sounds normal, I have done close to 85k miles on this car so I know it very well.

I guess the trick is trying to find the exact part, but at the same time I want get a 2nd opinion, so I am going to drive it as much as I can till the CEL comes back on again. I am the 3rd owner, the 1st owner had it serviced at the dealer, and the 2nd owner had it only for few months, so I can't categorically say that the ECM wasn't messed with, but it is unlikely. What is this document you are referring to?

[misha]

Yep it's p0 1270416...i just left the "p0" thing.

What are the actual symptoms of the car?
How are the rpm's...are they constant or vary & on how much rpm's the engine is running on idle?

Take a picture for me from around fuel rail,injectors & vacuum tree and post it here.I need to see do you have fuel pressure regulator at fuel rail or just a damper.

Also....the picture from intake manifold(from between alternator & steering pump).Take a close look between them and see if you have a rubber elbow at the left side of intake manifold.

And the most important thing...get those codes from your mechanic.

[misha]

...What you mean by "Motronic 4.3", my car is automatic and has OBDII...

Motronic 4.3 is just ecu menagement system.It can be Motronic 4.3;4.4;Jetronic...etc.

So if your car runs & drives ok,have a stable rpm your maf would likelly be fine.Let's go on....

Do you have a black smoke from the exhaust at idle?
When you step on the gas and run the engine at about 2k rpm's constantly for a while(15-20s)...does the black smoke disappear or not?
Does it have two o2 sensors or just one (the front one)?

[ShahinS]

Yep it's p0 1270416...i just left the "p0" thing.

Yes it is P01270416, as you can see in the picture, so according to your Doc this is the original and correct ECM on my car?...

Yep it's p0 1270416...i just left the "p0" thing.

What are the actual symptoms of the car?
How are the rpm's...are they constant or vary & on how much rpm's the engine is running on idle?

No issue really with the car, rpm is fine, it is constant, and it sits at around 800/900 all normal. I am going to check on the fuel consumption, we are doing mostly city driving, so I used to get 21-22mpg city.

Take a picture for me from around fuel rail,injectors & vacuum tree and post it here.I need to see do you have fuel pressure regulator at fuel rail or just a damper.

Also....the picture from intake manifold(from between alternator & steering pump).Take a close look between them and see if you have a rubber elbow at the left side of intake manifold.

And the most important thing...get those codes from your mechanic.

I will work on those photos for you!!!... And I will see what I can do to get the codes from the Mechanic too. Thanks!

[ShahinS]

Do you have a black smoke from the exhaust at idle?
When you step on the gas and run the engine at about 2k rpm's constantly for a while(15-20s)...does the black smoke disappear or not?
Does it have two o2 sensors or just one (the front one)?

No Black smoke at idle, no black smoke at all (but I will double check that with somebody behind the car), got two O2 sensors, had the front one replaced 7-8 months ago, and the rear was done about 5 years/80k miles ago.

[misha]

...yes the car was running fine, so I thought that it was just an O2 sensor. It is running fine now too, idles ok, pulls and sounds normal...No Black smoke at idle, no black smoke at all (but I will double check that with somebody behind the car), got two O2 sensors, had the front one replaced 7-8 months ago...

I don't get it .....what is the problem then

Your mechanic said that the car is running rich....

If your car is running rich(like he said)you would have a black smoke from the exhaust as a result of unburned fuel and that's a fact.