archemitis Posted November 13, 2003 Share Posted November 13, 2003 why do the mpfi and spfi have different distributors? my mpfi has two vaccume solenoids, and the spfi has none. im guessing i cant switch the two. on the mpfi one, it has four wires coming out(two on one side, and two on the other) are two for ignition and two for tachometer? thanks Link to comment Share on other sites More sharing options...
calebz Posted November 13, 2003 Share Posted November 13, 2003 What years are you talking about.. I ran an 87 SPFI dizzy just fine in my 87 turbowagon.. plugged right in Link to comment Share on other sites More sharing options...
archemitis Posted November 13, 2003 Author Share Posted November 13, 2003 the one with the four wires, is off an 85 multi point xt with the flapper door. and the one with no vaccum hoses is off an 89 spfi. Link to comment Share on other sites More sharing options...
archemitis Posted November 15, 2003 Author Share Posted November 15, 2003 so does anybody know why one needs vaccum hoses and one doesnt? Link to comment Share on other sites More sharing options...
mitch184 Posted November 15, 2003 Share Posted November 15, 2003 sorry i cant help with the vacuum but i had a question relating. In the Hayne's manual it says that all turbo's have an air gap in the distributor. But a spfi or n/a mpfi does not have an air gap. i was wondering what the air gap is, and how you can still run an spfi 2wd on a turbo 4wd? Link to comment Share on other sites More sharing options...
calebz Posted November 15, 2003 Share Posted November 15, 2003 its not a difference related to mpfi vs spfi. Its because one is from an 85, which uses vacuum advance, and on is from an 89 which uses a CAS/optical setup. 85-86 have vacuum advance. 87-up do not(with the possible exception of 87 carb models.. don't know.. never had one). Link to comment Share on other sites More sharing options...
rubuild Posted November 17, 2003 Share Posted November 17, 2003 The other 2 wires are turbo/knock sensor related. Retards timing under hard acc. for pinging & knocking. If you want to know if your sensor is working, hook up a timing light, and lightly tap with a hammer around the area of the sensor. Kerry/Roo-Builders Link to comment Share on other sites More sharing options...
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