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Hi all, EJ251 shortblock, EJ25 D heads, STI gaskets I'm getting an unbalanced shake/hesitation from 1800-2500 rpm. I can't effectively accelerate until rpms are above 2500. Taking off from a stop, the car feels bogged down. Plugs, Wires are less than a year old. Fuel pump/filter/strainer within 6 months. Coil and ignition module are within spec according to an FSM that I read. There was a vacuum leak with the purge solenoid under the intake manifold. It was not operating. Before I found that, my STFT, and LTFT indicated (at idle) 3-10%, and 18-25% respectively. After plugging the vacuum line I have the numbers seen in the photo below. I just did a leak-down test. According to the gauges, I'm within 10% for each cylinder. ALTHOUGH, I do hear/feel air escaping through the intake, and the oil filler tube. I followed this for instructions: I have also done multiple compression tests. For cylinder #3 is 225 psi, the remaining cylinders are between 210 and 215 psi. Can one cylinder being higher than the rest cause an unbalancing/misfire/poor low-end acceleration? Even if the numbers are good, the fact that I have air coming through the oil filler tube and intake, does this suggest the motor is shot? Check my timing again? Is there any change in timing instructions when mating an EJ251 with 25D heads? The heads are closer together, and the bolt holes for the intake manifold needed to be filed down a bit in order to properly bolt it onto the long-block. I've done a smoke test in/around the intake/intake manifold/hoses etc, and don't come up with anything. Thanks for the help, Greg
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Hello all! Just bought my first Subaru. It's a 1998 Legacy GT Sedan (5speed) with 170,000 miles. I'm having a really weird issue with it... The temperature seems to be inversely related to my RPMs. When they go up, my temperature goes down. After buying the car, I drove it around 120 miles home, and found that at highway speeds 70-80 MPH, at 3400 RPM, the temperature gauge was a little less than a quarter of the way up. When I "punched it" to get around traffic, I could watch my temperature gauge fall to the C almost as fast as the tach went up. Once I got back on country roads, cruising in 4th gear at 35-40 MPH, the temperature gauge sat nicely at halfway. Outside temperature was was 9º F. Adjusting the heater didn't really seem to help (obviously wasn't blowing hot air when temperature gauge was down). I am really puzzled by this. Although mechanically inclined, I am by no means a "gear head". I'm thinking it's either an issue of too much coolant, something with the radiator, or a thermostat issue. Any suggestions on where to start? I know it's a little cold outside, but not cold enough for the car not to run where it should. Also, should I be worried about damaging the engine by it running cold? It was only at the bottom (cold) for maybe 5-8 minutes before at least returning to a quarter temperature. Thank you for any help!
