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When the engine is cold........ 200 87

posted by  someone claiming to be B.C. on  Tue Oct 30 11:46 CST 2001 [RELATED]

the gasoline vapor will condense onto the inside of the cold metal intake manifold and the mixture that gets into the combustion chamber will be too lean to work right.

In the olden days, B4 the EPA/feds/CAFE demands, that problem was "fixed" by using a choke. The device closed off some or all of the air passage into the carbueretor. In the modern FI days, the problem has to be fixed some other way.

Cold start injector or valve just adds more vaporized gas into the manifold. The 1982 and older B21F engines may have this "fix". Newer ones, the B23F and B230F from 1983 on use a tweaking of the injector control by the ECU. It gets a signal from the engine ambient temp sensor to tell it to add gas.

That's the sender that you may need to check out. It is mounted in the block, on the LH side, and has two wires, one BN-SB (or SB) that's a ground and one BL that goes to the ECU. (SB is black in Swedish)

There are other sensors in the area, the knock sensor has one BN wire, and the coolant temp sender which has a single yellow wire. Don't get'em mixed up.

Good Luck,

Bob

:>)





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