[camarossguy2]

Im not new at cars, I've been messing with motor for years, also I'm and A&P mechanic


anyway, I bought my brother 99 Civic EX with a blown D16y8. I found good deal on a D16y8 from a 96 EX (just the longblock).


Swapped the motor in and i now have a high idle problem about 1500rpm although if you give it a minute it will go down to 1100. threw a CEL for "high idle"
There a very loud "rushing air" sound sounded originally to come from the fuel rail, but using a tube, it appears to come from the area below the valve cover where the intake and motor meet.
I replaced the intake gasket with a felpro ms91553. Did not fix

I've checked every vacuum line and none are leaking. I took the IAC apart and cleaned it, bench tested it to verify the motor was working. didn't help.


I did some searched here and on other civic forums, and found a couple vague posts saying there are two different d16y8 intakes any time i search for one though, there always listed as a 96-00.
Felpro shows two different part number for gaskets... 91553 for a '99 and 91485 for a '96
majestic honda web site says a '99 civic intake manifold PN: is 19564 and the '96 is 19563

So this appears to maybe be the problem.



So how do i fix it? do i have to get a new intake for a '96 civic? can they be adapted or the leak plugged?
Any help is appreciated.
Ken

[sql_civic]

The 96-98 IMs are different than the 99-00IMs. The 99-00 IMs have air injection holes in that should be plugged when used with a 96-98 head. Usually JB Weld does the trick but personally I'd go out and get a 96-98 IM for $40 or so and not deal with the patchwork. If you need pix and stuff LMK and I'll expand on this issue.

[camarossguy2]

Yah, thats what i did the other day... jb weld the holes... runs great now,

thanks