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Discussion Starter · #1 ·
Hi, don't know where else to post this but I have a question:

I recently blew my 2005 Civic coupe's d17a1, (spun rods, shrapnel in the oil pickup, bent crank, warped block etc) and found a good engine on marketplace. Only problem is it's a d17a2.

I tore down the VTEC engine and put a new head gasket in and decided to even put in the d17a1 intake on (it was cleaner). But I noticed that one of the sensors on the throttle bodies are different. One has 91 on it (the one from the a2) and the other has 90. Is there a difference? Engine runs no problem but auto transmission is a bit rough. Is this a VTEC specific sensor? Or a Transmission specific one? Any help would be appreciated!!!

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2004 Civic EX (es2)
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Maybe this will help.
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My best guess is the IAC valve. If so it adjusts idle speed and prevents fast rev drop stalling (dashpot).
I can't think of a way this would effect shifting right off.

You might consider changing to the ecu/harness from a d17a2 so you get the vtec solenoid working. The cam figure w/o it is very mild. ..I.e. big difference in mid and upper rev power with vtec working. If you did/do change it, I suggest using the A2 throttle body to keep everything matching.
 

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Discussion Starter · #3 ·
You might consider changing to the ecu/harness from a d17a2 so you get the vtec solenoid working. The cam figure w/o it is very mild. ..I.e. big difference in mid and upper rev power with vtec working.
Thanks for the info. Quick Google search of the part number confirms it's an iac valve. I changed it to the d17a2 throttle and notice idle is a bit smoother. Transmission is still doing weird things, but it's a honda auto transmission from 2005, so I guess its just on its way out. VTEC ecu and harness not worth it, probably just wait for this one to die and get an 8th gen civic instead
 

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2004 Civic EX (es2)
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Quick idea on the trans problem. I've had AT troubles when somebody had put in the wrong fluid type. It may very well be toasted though considering the crater the previous engine left.
 
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