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Re: fuel problem, LH2.2, 1985 900T... Posted by Justin VanAbrahams [Email] ![]() ![]() In Reply to: fuel problem, LH2.2, 1985 900T..., Ed S, Sat, 13 Oct 2001 21:09:19 Members do not see ads below this line. - Help Keep This Site Online - Signup |
There are two things you need to check. You must check the tach signal to the LH box - dunno what pin it is off the top of my head, but you need to verify you're getting 2-3VAC (NOT VDC) there. If you're not, the problem is either your tach, the ignition module, or the Hall-Effect sensor. Given you've got spark, it probably isn't the Hall Sensor. You need to check to be sure that the switched power pin keeps its +12v during cranking - it should, but check it anyway.
After that, verify that both 87a and 87b on the fuel pump relay are working. You can make a little jumper wire with 3 ends to it, and connect one to pin 30, one to pin 87a and one to 87b on the pump relay. Need to have all three connected together. Could be one dead output on that relay.
Of course, verify continuity to the injectors from Pin 13 (IIRC) on the ECU. Should hit one pin on each injector.
Let us know how these tests go.
-Justin
posted by 64.168.1...
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