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hi guys, I need your help, ASAP. I looked at the engine swap links, but couldn't find anything in details about this. (i mean they are useful, but..) I got a problem: iam buying an mx3 with a 96 2.5 v6 in it from Probe, and it still has stock 1.8 Ecu and VAF, the car doesn't run good, it needs some work. Do I have to upgrade to Probe ECU, and if yes, then what year? cause someone was saying that 96 and on 2.5's have OBD II, which have 4 oxygen sensors, and then i have a problem...(mx3s have only 2 oxygen sensors (correct me if iam wrong) what should i do? also can i use 1.8 or 2.5 exhaust manifolds? some people are having trouble with 2.5 manifolds. what intake manifold can i use (i know i can use 1.8 ) , but what are other types of curved neck manifolds? Also can i put in pre 96 ECU, with obd I<BR>need help, thanks in advance

I would say use a ECU from a 93,94,95 probe, 626 or MX-6 and use the 1.8 ex. mannys so that the down pipes line up and like you said only 2 o2 sensor (thoses suckers are expensive) if it runs like s--- there might be ohter probs the 1.8 ECU should run it fine you just wont get the max power out of the engine <BR>And use the probe intake manny

so u did the swap? did u use probe intake manifold? how does it run?<BR>should i upgrade to 2.5 VAF?

sorry i missed that yes get the VAF from a 2.5 and yes I did the swap to a KL03 about a year ago

does all that little wiring harness from 2.5 engine hooks up to 1.8 staff with no problem? is there anything else i need to know? <BR>finally i have a chance to talk to someone who actually did the swap. <BR>thanks

yes just plugs right in but there was a litte box (i dont know what it was) that was atached to the "ECU box" that i just moved to the new ECU

ICQ now?

ok im gettin a 2.5 from a 93-94 probe, below 80,000, garunteed to run etc etc, with it im gettin an ecu, and a vaf, for 636, this a good deal. and also do i have to switch manifolds >??? help me out guys

You can use the intake manifold and ECU from the 1.8 or the 2.5. You need the VAF from the 2.5 IMHO. <P>If you can fit the intake manifold from the 2.5, use it. You may have to move the battery/brake cylinder a mite, but it should fit (at least in a 323 engine bay it fits and that's with a turbo too).<P>The intake manifold from the KL03 has much larger runners. Use it if you can.<P>If you can get the 2.5 ECU, that will run richer/be helpful later on when/if you open up your intake/exhaust/add power adders.

hey, one more question: what did u do with the throttle cable, i don't think mine fits? and where can i get all the vacuum lines diagram? I bought this mx3 today with 2.5, and it needs tonn of work. <BR>also how did u move the brake cylinder? i don't think it's possible in an mx3. do u have any pics of the engine bay? thanks

the Kl03 will fit in the mx-3<A HREF="http://dwm76.homestead.com/pic.html" TARGET=_blank>My Site</A> <BR>Second pic down thats my car with the 2.5 03 in it looks like the 1.8 but the neck is straighter(but not straight) and the runners are thicker