i have a 730 i wired up as a 749 using the sunbird schematics. the problem i am having is i have zero injector fire. im going to double check with a noid light tommorow for sure. ive been over my wiring harnes 10 times doing voltage pin checks continuity. my only though at this point is the fact that i dont have a 749 memcal is what is cuasing my issue. anyone have any good insight into this issue ?? or are there pin changes that i am unaware of?ive searched the arcives but ive seen no info other than to pin and wire it up like a 749 is this info accurate ?

 

yo.... the 730 only has 1 injector driver in it.. the 749 has 2 and therefore can use 4 P/H style injectors. the 730 cannot do P/H's. err well it could do 2...maybe
Your gonna need a 749 for P/H injection, of switch to Sat injectors and wire it like a SyTy. cheers, Bob

 

yeah i just looked over the schematics of the main board at ludis's site and bammm it hit me. this is the problem trying to run 4 peak hold low impendence injectors it wont work its dont have enough ummph to push the load. anyways im still not clear on the memcal thing is that going to affect limp home only.i guess ill have to scrounge for a ecm tommorow unless someone here has oen that they are willing to part with ?

 

Funstick,

Are u trying to run a 4 barrel tbi?

 

no im running a honda 4cyl port injected engine. an A20A from a 86-89 accord to be exact. the factory ecm sucks. it has no electronic timing controls. anyways i found a 1227749 sunbird ecm tody for $40 geusshat a decent price. at least it has the sunbird memcal with it. thanx for the help guys.

 

ok onto the good news. i got the car running and its running quiet well. the factory sunbird code is pretty close to what the honda motor wanted blm and int are just about 128 everywhere. i geuss using 27lb pr injectors with the rom helped. anyways doenst need to much tunning but the timing table is a bit more aggrsive than i need. anyways ill keep youll all post on whats happening with it. been a very fun project.

 

CL

BW

 

well i got some more scans today and everything looks good. i need to find some sort of VSS for inline use with the speedo cable te honda vss just doenst put otu the right FQ to use with either the optical or magentic VSS byte int eh code. so does anybody out there have a link to anyone who makes something like this ?

 

Painless Wiring makes a 2 pulse per rev(early tpi, tbi) and a 4 pulse per rev(late tpi) that go in-line with the speedo cable. It's not very big, but it might have some interference with firewall/floorboard in some applications, I had to put a slight bump in the floorboard in a regal. So you are using this ecm on a honda, are you using the spark control? how are you interfacing the distributor? sounds like an interesting project.

 

ok some pics this is used for fuel and spark.first build now i got tidy things up now that it works.arggh can i email some one the pics i have zero space to host them and i cant attach.