problem with a sohc to dohc conversion

hey i was just wondering if anyone could help me i have 89 coupe with a sohc and installed a 90 dohc from a hatch back, and i was reading the threads about wiring and how you just match the colores and the ones that dont match you dont do anything with. so i did that and everything is good but the engine wont turn over, it almost did one time, i check the fuel pump and it was working fine so it is gettig fuel. so then i thought i wired ti wrong or somethign but it wasn't so . so then i checked the ignition coil and it was working just fine so. do you guys have any idea of what it might be, the car has been sittign in my drive way for about a year, and i really want to get it up and runnin. thanks

there isnt a 90 dohc. 90 had sohc. 91 above had dohc. Check your sparks and timing. Also your ignition coils and such. Just make sure you are getting a spark from the spark plugs.

well the car i got it from was in the junk yard and it said it was a 90 so i figured it was like a december model or something , uh yeah i cheked all that stuff already thats why im kinda frustrated

do you think it might be something internally?

Let's think for a second. If the motor isn't turning then it doesn't matter that you are apperently getting fuel.

Is the battery and working? If so, maybe the starter is toast. Just hooking up a few wires won't determine whether or not the car will run.

Make sure to check all grounds (there should be 2 or 3, I don't remember at the moment)

I also hope you are using the harness and ECU from the DE. And a word of warning - your SOHC tach won't work.

I'm in the process of writing up a SOHC-DOHC FAQ because I see a lot a problems lately with them. Myself and a friend seem to have to only working ones I know of...

well yeah the battery and starter work( the starter and tranny are both from the ka24e) ill turn the key and the motor turns but it wont turn on its really anoying, and the harness is from a 92 240 and i have sevral ecu's there numbers are 26, 28, 30 and 14 the 14 is from the soch, i thought i toasted the ecu's so i went out and bought a bunch

The bloddy DOHC is one finicky SOB. Mine did almost the same thing as you describe. Let me know if your plugs are getting wet. If not, then do what I did and maybe by the same strange miracle that came to my car, yours will also work. What I did was take apart the fuel rail. Unhook the hoses (make sure that the return hose is where its supposed to be, etc.) and try cranking. I still have no idea what fixed mine, but taking all that apart seemed to do something...

Good luck, and keep me posted.

ok this is what i did i went and got another fuel rail and injecters from another 240 and it still wont start, do you think the fuel lines are switched around?

yeah the plugs dont seem to be getting wet but the pump does work i cranked it for over a minute streight and there almost dry. actually they are dry

It could well be the lines. Mine seemed to have a big air bubble in it...

so how do i fix that? well im checking the line but im not sure if the return fuel line goes on top or on the bottom.

Well, after cranking for a moment try *carefully* to take off a flex line. Cover your eyes because if the fuel pump is working it will be under some decent pressure.

Mainly its just trial and error, thats the last thing I did before it started for me. So if that doesn't work, all I will be doing is guessing.

BTW, do you have MSN? It'd be a lot easier to discuss through there.

no i have aim

boo, get MSN or keep suffering. lol, I'll help out as best I can, but I'm going to go watch some Option vids, so I'll check posts later.

alright awesome dude thanks

dude your a life saver awesome after a years of work, all it was was the fuel lines haha im so stoked

Excellent! Congrats man. Good luck with the rest. And if you crash it I will be pissed!

ohh hey i have another question , if you look at your intake it has three vacuum lines the two small ones and the big one, i have no idea where that big one goes, do you think you can check on yours and let me know?

it sure is nice to hear my 240 rev again its sweeeeet!

Wait till you feel the DOHC pull, now that is a good feeling.

The big line is already attached to your intake? I'm not sure exactly what you are talking about... I'll check on my lunch break.

yeah there are three vacuus the two that go to the intake and valve cover and then there os oneperty big one that faces down near the battery i, its not conected to anything on my car and i have no idea where it goes

man it feels good to ride in a ka24de powered cr again. ive been using my rx7 and man there's a diffrance!

hey man looks like u still cant get it working, first thing id do is check the alternator even though the battery is good the belt to the engine and alternator could be bad or just isnt getting enough power to turn over. the other thing id check out is the timing belt it could be busted or already old or off set. id looking into both things u might wanna go out and buy ur self a chilton do your self auto repair book on your car, they have them at all auto places and stores, the third thing id check is the ecu unit making sure all the wires are hooked up properly even though yes it is true some wires u dont do ne thing with but some wires are back up ignition wires and what not id double check everything keep me posted and good luck

^^^^^^....ummmmm no he has it running now, hes just wondering about the intake lines.