hope y'all are having a fantastic day. I recently bought an 88' crx Si shell w/ a D15b2 block and a Y7 head. The dude I bought it from said that "he had it for two years and driven it off on on but there was no problems" . When I got the car it was running fine until, on the way home of picking it up the alternator belt snapped and it hasn't started right since. I replaced the timing belt with a new one and changed out the head gasket that i knew previously needed to be replaced, and i gave it a compression test and everything was fine there, then i checked the ecu witch is a pm6. and it was giving me errors for the distributor. I went out and bought the y7 dizzy, and the only was i can get it to run it with a vacuum leak buy unplugging one of the tubes on the fuel rails. I've been trying to tackle this problem for a bout a couple months now and I'm honestly stumped on what the issue is, ive even went through the time of taking out the engine and dissecting everything and yet nothing. than k you for your time!

 

by unplugging the tube or the vacume hose from the fuel pressure requlator you incease the fuel pressure and if the car ran that way
then that tells you that it has way too little pressure to begin with
so that may have been your problem all along

a week pump a dirty fuel filter or a bad requlator either one of those 3 will give you bad fuel pressure

the alt belt snapping is just bad luck

now the y7 dizzy that you bought will not work with a pm6 ecu
the y7 dizzy is to work with a obd2 system
and your pm6 ecu works with a obd0 system

so the dizzy that you need is one that works with the obd0 system
im assuming the type that came on the car when you bought it


let me know if this info helped
and good luck

 

If it runs with the y7 dizzy, no codes, you have the right one. It plugged into the harness that the last owner put in there, it's probably good.

It runs better with the vacuum leak? Will it idle otherwise? It's about a 10 psi difference in fuel pressure with the line off, If I saw this I would typically think the added air is helping more than 10 psi fuel pressure at idle. So, first thing I would check are all the things that make a low idle, check that the throttle body is allowing air past the throttle plate to idle, check the iacv, check for t belt off a tooth, your ignition timing could be way off and doing the same.