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A client brought 2 Honda OBD1 ECUs to me for chipping and repair and then asked me to chip his Nissan ECU which has a 28-pin eprom soldered directly to the board. The problem is that the chip is covered in a hard, plastic 'goo' that I have to remove in order to get to the chip.

Does anyone know what I can use to remove this 'goo' without damaging the ECU? I tried heating it with a heat gun and although it softened up a bit, I'm worried of damaging the surrounding components.

Any 'working' suggestions are appreciated!

it's called Conformal Coating
there are chemicals to remove it, but the easiest way is to scrape away what you can at the contacts then heat the rear of the board with a good heat gun.

Invicta - yes, I tried a heat gun and it softened the 'goo' a little bit
Relic1 - thanks for the idea on the rear of the board

What nissan ecu is that?
We chip RB20de and RB20det ecu's all the time that look like that. But never seen any with a coating over it like that?

Maybe aftermarket chipped.....

Yes, it's has an original MINES chip which I read and saved

Hey Coupe-r I'd like to offer chipping services for these Nissan ECUs. Can you give me some tips on which years/models/cars accept the sockets and if there are any "Crome" equivalents to make basemaps?

Thanks!

No problem,
Basically ANY early 6 cylinder RB Nissan ecu can be chipped to run turbo basemaps.

The ecu's are SLIGHTLY different between turbo and non turbo, just the hex locations. One doesn't have knock location one does. (one uses 128 chip and one 256)

U know when you can chip the ecu when it has a chip socket, but ALL 6 cylinder 89-95 do. OBD1 basically.

R32 skyline, Cefiro, Laural etc.
You can also use a OBD1 ecu from a R32 syline, on a R33 syline, however you won't be able to use the variable timing cam gear. (no output for it in ECU)
BUT if you use the 300ZX ecu and nistune you can use the output for an R33.
The ecu plugs straight in

The SR20 powered cars can be chipped as well, they are 16 bit and need a daughter board to add two chips. (So two ostrich)

The Crome equivalent would be Nistune I guess. There is a free version you should be able to use, prob has an expiry.

A few people actually tune these ecu's using crome with a plugin, however I feel nistune is a more complete solution.
Remember it's air flow metered system, so load based not map like Honda.
So AFM scaling is important if you change injector size, or put the AFM into a bigger housing etc

Cool - thankyou my friend!