B5244S 1999 V70 1999 V70 - Will ECUs stop a 'like for like' Engine & Auto Swap?

CNGBifuel · Post by **CNGBifuel** » 30 Aug 2021, 02:45

B5244S 1999 V70 1999 V70 - Will ECUs stop a 'like for like' Engine (MOTOR) & Auto Swap?

B5244S 1999 V70 1999 V70 - Will ECUs stop a 'like for like' Engine & Auto Swap?

We're about to undertake a like-for-like engine & auto gearbox swap from one 1999 V70 CNG car to an identical CNG car. I think across the pond you were sent a few factory CNG 850s back in the day (see piccy). For this swap, the cars are CNG V70s

: CNG.png (179.31 KiB) Viewed 1657 times

Of course, move only mechanical parts, that'd be the general idea - Is it really that simple or workable? Is there not something, buried in say the transmission, that means we're forced to stay with the existing box and can't move the donor box across with the donor engine? We don't have VADIS.

Identical or not, some things are known to stop this swap for sure, ie we know the ETM can't move from the donor car, those are coded to the ECU. Without VADIS to make things work, each ETM needs to stay with each car.

We're moving the autobox too. All as one lump. We're quite frightened the sparky bits won't play with each other, eg: is the box coded to its own transmission ECU?

Identical cars, both are B5244S 1999 V70 with Denso sparks. Donor is same year, same variant, same box etc. What else stops this being a simple spanner-job, sorry... wrench-job?

We're cutting out the donor from a 'breaker' today or tomorrow. Both cars are V70 NA B5244S
AW55-50/51SN

Post by **abscate** » 30 Aug 2021, 04:41

In the North American market ETM is not coded to the ECU in 1999

However , the ECu is Vin coded to the immobilizer and lock control module, possibly the DIM too

CNGBifuel · Post by **CNGBifuel** » 30 Aug 2021, 07:00

Thanks, things may be different your side of the pond. Quite the opposite, which is odd. On these UK 1999 cars I can confirm for fact, with every certainty, the remote lock module is not coded to the car. I've previously swapped fobs via the under dash -mounted lock module swaps, this between these same two cars.

But thinking about this i was told you can't swap ETMs, and took this for verbatim. I've never actually tried to do this, it could well be straight piffle. To be sure, whilst I've still got these running, this might be a 'suck it and see' exercise. We want to move the donor ETM. It's got a rather jaunty Sacer 'Hall Effect' conversion.

If you're right, and I hope you are, that'd be nice. I'd guess the ETMs from 2001-2002 'ish Denso cars could be nailed-in too.

Post by **abscate** » 30 Aug 2021, 10:30

Take a picture of the ETM labels and post them up. I think NA to NA same year is a 99% good swap. If it’s build date is post 2006 or so it will have all up to date software.

CNGBifuel · Post by **CNGBifuel** » 31 Aug 2021, 01:39

OK, will do. It's a 20-25min job to swap them round. I always kill a chicken over my socket-set. Can't hurt. Might help.

I'll throw the donor ETM on and see what happens.

Post by **abscate** » 31 Aug 2021, 02:54

I always kill a chicken over my socket-set.

Okay, I need help with this one , and I hail from the West Midlands!

Post by **matthew1** » 31 Aug 2021, 09:57

CNGBifuel wrote: ↑31 Aug 2021, 01:39 I always kill a chicken over my socket-set. Can't hurt. Might help.

Because of this fantastic line, I'm following.

Post by **Clemens** » 31 Aug 2021, 14:44

How interesting that P80 bifuelers existed. I had a rental P2 in Sweden once that was bifuel. For no reason whatsoever. Quite doggish, as far as I remember.

CNGBifuel · Post by **CNGBifuel** » 01 Sep 2021, 02:12

Okay, I need help with this one , and I hail from the West Midlands!

i did wonder about the Welsh flag, the Americans I meet like to claim they're Scottish? Christ knows why.... there's nothing more risible than Yanks in kilts. Flounce about in ermin, a crown, orb and sceptre; and have it done.

Love my BiFuels and have done galactic miles in them. Volvo did factory LPG and CNG variants. They didn't sell. Even the Swedes didn't buy more than 2500ish. The Swedes sent a handful Yankside for press-fleet cars, I've the press-release bumpf somewhere.

Whereas they give fuel to you, one big reason Brits don't 'drive' is fuel cost. We're paying USD8.50-9.00ish per US gallon - (about USD10.00 -11.00 per Imperial gallon. Imp gallon is larger). Brits seem to like high priced fuel. Our government invited us to a champagne reception of tax breaks, and no one went. Numerous attempts by manufacturers to offer Bifuel varaints, (LPG/CNG are low tax fuels) were repeatedly shunned. Clearly GBP7.00 is too cheap.

In this car, methane knocks that cost a lot, but methane kills some grunt, and on petrol it's no road-burner. Compression ratio for one has to be hobbled to allow for petrol over the gas requirement. Gas wants something like 13:1!

Q: Cutting disc ready, I'm going to cut the box and engine out, as one. Will both go in as one lump, or will I need to separate anyway?

Post by **abscate** » 01 Sep 2021, 08:25

You can leave them together, but many would argue not replacing the 5 quid Rear engine seal when the engine is out, is a false economy.

We trace back to Wales in the early 18th century