1998 V70 AWD Turbo - ECM ECU what other models or years fit?

Andrew Vanis · Post by **Andrew Vanis** » 09 May 2015, 06:09

ECM / ECU / Computer – what other models or years fit? - 1998 V70 awd turbo

Mechanic tells me to look for a replacement to fix a misfiring situation - originally chronicled here - https://www.matthewsvolvosite.com/forums ... =1&t=69082

What models or years can I pull a ECM ECU from that will work as a replacement for my 1998 v70 AWD Turbo?

Thanks,
Andrew

BigRed · Post by **BigRed** » 09 May 2015, 06:35

If your feeling adventurous, any ECU from a Turbo model with Motronic 4.4. You would need to flash the proper stock firmware.

M44 Wiki

Andrew Vanis · Post by **Andrew Vanis** » 09 May 2015, 06:48

at this point I'm lokingfor lug-and-play

Flashing etc, maybe later but I'd have to learn about it. Now I just want to drive the thing.

Post by **doublebug** » 09 May 2015, 07:41

There won't be plug and play because of immobilizer.
So flashing is absolutely necessary.

Post by **erikv11** » 09 May 2015, 07:48

Any 98 GLT or AWD will be a direct swap, although you need to pay attention to the air pump if you are not willing to consider the diode trick.

Any 98 T5 ECU will work just fine if you are willing to also swap in T5 (white) injectors at the same time.

There is no immobilizer issue on a US-spec 98.

Post by **misha** » 09 May 2015, 08:54

Ecu which have exactly the same Bosch numbers like yours will be required.

Post by **erikv11** » 09 May 2015, 09:09

Just not true for the US cars. My 98 GLT has a T5 ECU, it has been done many, many times.

Maybe this guy is ready to give up and part out the car, offer him $40 for the ECU ... http://albuquerque.craigslist.org/cto/4998210820.html ... or $400 for the car and you will be covered for every nuisance longevity failure over the next 5 years.

Post by **misha** » 09 May 2015, 09:18

And you're saying that you don't have check engine light on with T5 high pressure turbo ecu on GLT which is low pressure turbo?

Post by **jimmy57** » 09 May 2015, 09:48

Yes. The same sensors are used and the correlation of MAF signal is very close. The T5 ECM will have some fuel trims that are 75% of the way to a fault code but I have not seen them set codes unless there was actually something wrong. You have to use high octane fuel since the fueling and timing advance are for an engine with 8.5:1 comp ratio and spark knock becomes much more of an issue with 9:1 CR.

Post by **erikv11** » 09 May 2015, 10:06

What jimmy57 said. You can upgrade the turbo to 15g or 16t with the T5 ECU installed (true, I did that), but it is not required you can also just leave the 13g in there. Put in the larger (white) injectors and the fuel trim issue is averted altogether, but as stated it doesn't throw codes for fuel trim either.