I just put a rebuilt engine into a 1986 samurai and I can't get the thing to idle. It acts like it's not getting any fuel on the idle jet. Just like an air leak. I checked the manifold as best as I could for air leaks. I used a vacuum pump and a gauge on everything plugged into the manifold, then I sprayed every fitting with carb cleaner and listened for a change in running. Nothing! Above Idle this engine runs strong aside from a secondary throttle plate I can't get to open untill I get to 4000 rpm.
This next issue is odd. I did the "clicky" test on the MCS and blew through it to make sure it is clear. I probed across the terminals for the MCS and got 30 Ohms of resistance. I checked the wiring to the O2 sensor and the MCS and it was good.
Funny thing is I can unplug the computer and the engine runs exactly the same. Is my MCS or my ECM fried?
This is my course of action I am going to take. I am going to drive the samurai to a local shop and have them look for air leaks too just to get that out of the way. Next I want to test the ECM but I don't know how. I would assume plugging it into a running samurai but I don't have access.
Third, I want to test the carburetor. I want Petroworks to do it because they smog check their carburetors. However, Petroworks said they could do it but they are also swamped with carburetor work and would take a long time to get to it.
So my questions are: Would a non functional MCS make my engine act like it has an air leak? Where can I get a known good ECM?
