SPARK PLUGS SPEC? AND WHERE IS THE ECU LOCATED ON THE MK4?

[herbiemercman]

When my NAT conversion was done by "Rocket Dog Racing" he fitted NGK BCR. 8ES. spark plugs, apparently they were said to be a softer plug more suitable for a hotter engine.? Need to know what other Members think as i am about to change them, like for like. My other question is where is the ECU located, many years back i think somebody told me it is under the front passenger seat?

[chaoticentity]

The engine ECU is located in the passenger side footwell, under the carpet, within a black plastic box. 

[herbiemercman]

Thanks for info, I have just been reading a thread on Members trying to repair their ECU and it seems like a very long winded and high dexterity job, one of the Clubs most respected Members carried this repair out and failed. I am amazed there is not someone out there that has not set up an "Exchange and Repair" service as it seems like this is a very specialised job. I would love to know if replacement ECU's are still available from the OEM's, all be it i bet we will be looking at circa £1,500, or more?

[Dnk]

I've not used them myself but i know of two people who had seat ECU's for classic Range Rovers repaired by this place.

Might be worth a call or email 

https://www.avilec.co.uk/

Incase you haven't seen it 

 

Edited December 15, 2021 by Dnk (see edit history)

[Scooter]

Also a few NA ones on ebay that might be worth having as a spare/testing/backup one.

[herbiemercman]

Thanks Scooter i never thought of that and i thought they would be expensive. My car has only covered 60Kmiles from new and i have owned it for 24 yrs, is it a time thing or high usage which causes your ECU to fail? Also my car runs fantastic for moderate speed journeys, it is only when i give it some real boost that the misfiring and the fuel rich exhaust plume appears. I have a Mercedes e-300 from new with 270K on the clock and the ECU is fine.

[evinX]

The ECUs go bad with age, electronics and leaking capacitors that are not designed to last, its their nature as they are filled with a liquid. Chips will go bad to. And being left outside in a car over time and many different weather conditions wont help electronics. The Supra community needs someone who can actually do electronic repairs with garuntee, theres a few on social media who have the gift of the gab and nothing but bad reviews. I myself spoke to them and they just seemed to want the parts and payment with a whole load of chat.

Someone out there must be able to make the boards of a early 90s Toyota ECU

Edited December 15, 2021 by evinX (see edit history)

[herbiemercman]

Thanks evin, good info, but sad situation.

[evinX]

1 hour ago, herbiemercman said:

Thanks evin, good info, but sad situation.

Grab a spare ecu and keep it in a anti static bag. Best you can do for now