janas19

Nah, engine should be fine. One thing you might try, disconnect the vacuum line from the fuel pressure regulator and open the throttle. If the problem changes, then you were likely getting enough fuel pressure. If the problem stays the same as before, then likely the bad pump.

Might have a bad fuel pump. Sounds like a bad fuel pump imo

Nice! Gives me hope I might find a good deal on my hunt

Yeah heckuva score. Where did you buy it?

If the manual transmission sensors on the 93-95MY Imprezas can all be threaded/spliced to the 99-02 three plug harness, that wraps things up for me. Basically, all I need to know is that I don't have to do a tranny/gearbox/clutch swap. I intend to keep the drivetrain exactly the same, don't want to spend a dime on it for 165HP. Everything on the engine side will match up with the full harness swap. The headlights/taillights may be a PITA but should work out. Dash, cluster, and ignition switch will be fully swapped from 99+. Dash back is pretty irrelevant. Front harness, fan switch, and fuseboxes may be a PITA but I think it will work out. That's pretty much all I need to know, think that just about wraps things up for me here. Unless anyone else wants to chime in then I'm moving forward from the planning stage to the acquisition stage of the project. A huge thank you for all the helpful info.

Texan, I disagree. Cook your brakes before cooking your engine.

Alright, I have been straightened out thanks to matt167 and Numbchux. Here's the revised plan: 93-95 Impreza wagon 5MT EJ251 longblock 3 plug ECU harness and dash from 99-02 Forester 99 Forester ECU with MAF My unknown variable at this point is the 93-95 5MT tranny and gearbox. Is it compatible with the 3 plug JECS ECU? Here are the connector terminals for the 93-95 which I have been able to find: Backup light Neutral switch Vehicle speed sensor (VSS) Starter interlock Are the 99 harness connectors plug N play? Doubtful. Two possible options: 99 sensors plugging into 93-95 tranny. Or splicing the 93-95 connectors to the 99 harness. Anybody have an answer or should I look to the junkyard for answers?

OK, wow. I really am actually an idiot. I just realized that the 99-02 cars are SOHC. Why was I thinking DOHC? I guess I thought JECS ECU in 99-02 meant different ECU which meant different heads. Nope. Same heads, different ECU. OK, I get it now. EJ25D = 96-99, one plug ECU, DOHC. EJ251 = 99-04, with two different 3 plug ECUs. 99 Forester has the 3 plug ECU with MAF. 99-02 are MAP. Matt167 is suggesting the 99 Forester ECU and SOHC heads are plug N play. Man, I really apologize for my own mistakes and stupidity. Thank you Matt167 and Numbchux for straightening me out.

Documentation on 95 L coupe to 98-01 dash conversion: http://www.rs25.com/forums/f145/113716-rhd5280s-1995-l-coupe-2006-sti-swap-widebody-gtx3076r-now-dry-sump-8.html Looks like 4 modifications are required, 3 can be done with drills and grinders. For the last one which requires welding I am going to cold weld the dash mounting tabs using JB Weld, should be adequate.

Working link to the full 99-01 Impreza wiring diagrams PDF for reference: http://www.mediafire.com/file/ndg4nnm5tvz/Subaru_Impreza_wiring_diagram.pdf. 65 pages of wiring goodness mmmm. Going to be parsing through all this next week.

Thanks Matt. The idea is to go full Forester harness and dash, since 2.5 Imprezas are so hard to find. Nice tip. I'll definitely pick up the DOHC heads off the 99-00 to match IACV, but like I said, it's going on top of the 251 shortblock. Too risky to use the 25D bottom end when junkyard is the source... Are you aware if the 93-95MY 5MT switches match up to the 99-02 Forester harness? That's my primary concern. Thanks.

I found something interesting at the junkyard. There's a 98 Legacy hybrid. It has the DOHC, Phase II block, and a single plug ECU.

Took a trip to the junkyard today. That was enough to dispel any illusions. This will be a helluva job. I'm estimating 1-2 months, minimum, for a full OBI to OBD II harness conversion on the 93-95MY. First thing is to map and plan everything out. First, I have to do a full walkthrough on the OBD II vehicle and identify every necessary electronic signal. Then I need to get the Impreza wiring diagrams and map out each signal I have to retain. Finally, I'll have to strip both vehicles and find the terminals/plugs of all signals, fuseboxes, relays, and connectors. It will be loads of fun, I'm sure! That's only the beginning. This conversion is going to take a couple of months, at least.

Mind elaborating on that? I'm using the 25D mani and harness... Why would TB and idle be an issue? Also, it seems to me that the Impreza dash/harness would be easier? The Forester has a different body so the harness and dash dimensions won't match up as easily? The 2.5RS cluster is ugly as sin. I'd rather using anything else than that cheap white monstrosity. I'm going to go to the big junkyard 40 miles from home today and look at every Subaru. I'll be taking notes and preparing for the conversion. No one here is selling a hatch. I might have to go to UT or TX...

OK, this is what I'm going to do: Junkyard EJ251 shortblock EJ25D heads, 04-06 STi MLS gaskets 99-02 2.5RS harness, cluster, and ECU 93-95 GF5 wagon 5MT Any mismatches or big mistakes here? I'll figure out the small stuff myself, but this will be the plan going forward.