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K20a2 fg2, help!

70K views 501 replies 72 participants last post by  WHOA tC  
#1 · (Edited)
K20A2 Bottom End, TSX Cylinder Head + Cams, z3 tranny.

So I bought this salvage car (I understand it's going to need some fixing, no flame plz lol) I think it has an rsx-s motor and possible a civic si tranny (How do you find out if the tranny is an Si or rsx-s tranny?). Right under the throttle body it says K20A2 and I don't know where to look it for on the motor. Its not on the passenger side of the block. I took it for a spin and can't vtec lol. It cuts me at 5500 RPM. When I Rev it sounds like vtec is somehow engaging at 4700 since that's when it sounds throatier. The tranny clicks and spit my gear out twice. Maybe the motor oil is low, but its definitely not an Si motor. The intake manifold looks exactly like the rsx-s, it's blocky, not tubular lol.

I havent' done an oil change or tranny fluid flush yet (maybe the reason I can't vtec because of oil pressure), but i'm going to once I get some time. I have pictures of it, it has the intake manifold of an RSX. If it's a type s motor i'll keep it, if it's not i'll swap and sell. When I shift, the car like stops, then half a second later, it like SMACKS into gear then engages. The motor might be good, the tranny is possibly bad unless it's missing fluids everything. I'm mainly concerned about the vtec issue also. I hear aggressiveness at 4600+ then rev limited at 5500. You clearly can tell the difference in sound from 1000-4600 RPM, then 4600-5500.

I don't get it though, it's weird. My battery is shot, I tried to jump start it and it wont hold a charge. My car stalls because the tube that goes from the crank to the intake is missing. I may need help with this one because i'm new to Honda, completely. I've also thought since it's a rsx-s motor, i would need the rsx-s ecu. (Speaking of ECU, maybe it's in limp mode?)

I haven't checked the spark plugs yet. I haven't had any real time to check anything but the obvious to the visible eye, got back at 7 last night from socal and drove all the way back to norcal and was dead tired, then washed the new baby today and went to work.

My car also has a check engine light. P2182 or something. It read it as a Coolant Temp Sensor High something lalala which is understandable since the radiator was hit.(Speaking of ECU, maybe it's in limp mode?) I tried to clear the code with an OBD2 scanner (if anyone needs their car scanned, hit me up! I can erase them if you need to get smogged), but right when it erased the code, it came right back. The car looks clean as hell, but i'm just disappointed motor wise.

And yes I established already that the car being salvage, I would encounter problems so no flaming there please lol.

But if anyone has suggestions hit me up and see if we can get somewhere with my new baby. I had a tC and blew my motor from major blowby on my superchargerI don't want to run into the same problem (even though im not boosting) especially with a car this sexy.

Thanks you guys!
 
#5 ·
I'm at work right now, can I send them to someone and they can post it for me please? I'm like dead serious lol. Photobucket is blocked at my job. I actually have this same topic posted in the Official Sacramento Thread, my friends seen it already...
 
#7 ·
^ okay ill check it out. Where is that sensor located? And i'm getting someone to get the pics on there for me. Ill post pictures of what I took today, and i'll get more pictures tomororw. Is a k20a2 a bad thing in my Si? I have an 06
 
#12 ·
Thanks, I don't know if that's anything spectacular or not. I thought it was an Si motor till my friend said the intake manifold is lower and is more squarish. Then today I read the Si is a k20z3 and the 02-04 rsx-s is a k20a2. So is the type s motor in the Si real good? Is it common?

I moved from Scion so please excuse my lack of honda knowledge.
 
#488 ·
The k20z3 and k20a2 are very similar engines. Additionally, the RSX-S and 6th generation Si's share transmissions, just with slightly different gearing. As for limp mode, could be anything in this case. i'd suspect the busted up radiator for starters, or the air intake that doesn't seem to be connected to anything at all. As for the sloppy shifting, I'd check the transmission fluid. Get underneath the car and check for large bolt near the very bottom of the transmission, on the driver's side. That's your fill bolt. Unscrew it... if nothing at all comes out, you're likely too low (or entirely out) of transmission fluid.
what he said also on the rsx-type s the trannys not that strong so if u get the chance add a dog box gearing to make the tranny abit stronger.....nice finding tho...
 
#13 ·
The k20z3 and k20a2 are very similar engines. Additionally, the RSX-S and 6th generation Si's share transmissions, just with slightly different gearing. As for limp mode, could be anything in this case. i'd suspect the busted up radiator for starters, or the air intake that doesn't seem to be connected to anything at all. As for the sloppy shifting, I'd check the transmission fluid. Get underneath the car and check for large bolt near the very bottom of the transmission, on the driver's side. That's your fill bolt. Unscrew it... if nothing at all comes out, you're likely too low (or entirely out) of transmission fluid.
 
#15 ·
That's definitely a k20a2 in there. Wonder who did that swap.

Yes, it's got slightly more horsepower than the civic si, and the si tranny is there because it has an LSD, so if you have to end up getting a tranny, get another si transmission :D

the k20a2 doesn't have dual balance shafts on the oil pump, so it has 4 more horsepower, and revs a little faster thanks to less weight to turn on an instant.
 
#21 ·
That's definitely a k20a2 in there. Wonder who did that swap.

Yes, it's got slightly more horsepower than the civic si, and the si tranny is there because it has an LSD, so if you have to end up getting a tranny, get another si transmission :D

the k20a2 doesn't have dual balance shafts on the oil pump, so it has 4 more horsepower, and revs a little faster thanks to less weight to turn on an instant.
not really more horsepower....when the RSX type S was out they rated the HP a differnt way than they do now......if there is a difference its like 1-2hp
 
#17 ·
Yeah I was looking at the throttle body and it looks like there is no cable for the throttle control.

I did find a sensor that wasn't correctly plugged in, it looked like a sensor at the very back of the tranny or block that was linked to the fuel rail.

As far as tuning capabilities, wouldn't I still have to have the si ecu to run interior functions? With turbo tcs on standalones, the stock ecu ran electrical functions inside while the standalone ran the motor functions.

I guess its kinda cool there's a type s motor in there :eek:. When I tried to run the car, it does rev fast and felt like it had more torque and it doesn't really sound like an Si. I also think the motor mounts are bad, the motor shifts A LOT when I rev, the whole car jiggles.

Ill get more pictures and possibly a video today since I'm off. Anymore input on the possibilities of my car being in limp mode would be perfect. Thanks you guys. Hopefully this car works fine :)
 
#20 ·
And let's see. Since it is a type s motor I would assume I need a type s ecu? The ecu on my car is an si ecu
 
#27 ·
How would that be a K20a2 with an electronic throttle? You sound very knowledgeable, so are you sure there wasn't a cable actuated throttle?

I guess you could do a k20a2 with an SI ECU and electronic throttle, but I don't know why :)

In all seriousness, why were you driving it in that condition? Your radiator looks like it's not functioning, you don't know if it has enough oil in it, and you may have a broken mount somewhere....and you are trying to salvage what's good?

Stop breaking more stuff :) Start fixing that puppy up. You've got something unique there.
 
#28 ·
I got the car for 4700. Andi believe its the whole a2 motor. I looked at my friends z3 and looks nothing like the block I have in my car. Plus underneath the throttle body, it says k20a2 etched on the block.

it doesn't matter if my motor is faster or slower than a z3, as long as there's vtec and the hp is what its rated at, I'm good. 197 or 201 is fine. I'm satisfied with the type s motor lol.

Just need to get things up and running!

I have more pics. I found a sensor that won't properly snap into place. I just have to find a way to upload it, I only have internet on my phone for time being.