chap2700

iTrader: (5)

Here's the story:
Engine (s4 tii) is Japanese spec bought from ALN JDM Auto Motors, LLC. and has said to have around 60,000 miles give or take. I installed the engine using my old tranny and it ran fine. Compression checked out at 90psi at both front and rear rotors when I first installed the engine.

Some background info:
The car idled at 1000 rpm and the TPS read at 1.3V, anything lower and the idle would surge.
In order for me to get the car smogged (in CA) I need to install an EGR valve to pass the visual part of the test. The J-spec LIM unfortunately does not have a place where one can bolt on an EGR valve, so I had to replace the whole LIM with a US one.

Within a span of 2 weeks (no time because of Christmas season), I was able to replace the LIM, putting in new gaskets and checking for any loose or cracked vacuum lines, and install the EGR.

The Situation:
Yesterday was the first time I started the car, started right up, so I let it idle for about 5 mins before I took it for a test drive and drove fine. Today, I tried to take it to a smog station (about 10miles away) and coming out of the freeway, it died on me.

When I tried to start it again it would rev up to 1000 rpm and die, usually it revs up to 3k and drops down after a few secs (I don't have the CSA). The only way that it would start would be if I were to push the gas pedal and keep the rpm above 2k. I let the car cool down for about 30-45mins and then drove it home. At the stop signs, the car would die if the rpm wasn't above 2k. I hopped on the freeway, keeping the rpm above 2k and it seemed to run fine when I was shifting.

I'm not sure what the problem could be. The car feels like something is pinching a vacuum line not letting air go in, but when I start the car and keep the idle at 2k, it doesn't surge or act like theirs a leak or suffocation of air.

The Problem:
The problem is only when I try to start the car, it will not rev up to 3000 rpm when starting, revs only to 1k and does NOT hold an idle. Like I said, only when give it gas, will it stay alive. I drove it fine on the freeway keeping it above 2000 rpm.

Any thoughts or suggestions would be greatly appreciated, and if any more information is needed please feel free to let me know

AGreen

iTrader: (11)

Try a compression check. That's pretty typical symptoms of a toasted rotor.

Also, this is not a build thread.

chap2700

iTrader: (5)

Oops sorry about that, I'll re-post it somewhere else, still new on how this forum works.

Either way since I'm here, I checked the compression today and the front reads somewhere between 85-90 and the rear reads above 90psi.

AGreen

iTrader: (11)

Did you do the bounce check?

Rotary compression test is different from a piston engine compression check. You have to get compression of all 6 faces. Not front/rear rotors.