It's a serious question, as mine doesn't have one (yanked by previous owner, i guess). But with unleaded fuels on this old engine, is this wise? Or should i get one install it back into the system?
thanks in advance

martin in beirut

Removing it is going to throw the EHA completely out of whack. There are non-O2 sensor CIS systems, but your 87 should have the O2 sensor. The EHA needs it to function properly. I don't get why someone would remove it...

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thanks for that. I read on another forum that people did that when non-leaded fuel came on the market. Anyway, i will look for one now, for sure. Would you say this could explain the rough running when it's hot? And the fact that the plugs are black?
thanks again.
M

Maybe someone stole it. Yes, this affects the fuel mixture, and a rich mixture gives black plugs.

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