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Old 07-15-2008, 10:15 AM   #1
Scooby Specialist
Member#: 38829
Join Date: Jun 2003
Chapter/Region: NWIC
Location: Tigard, OR
Not your usual 1997
Legacy GT

Default Cams + LW Flywheel + LW Pulley = CEL...?

I know this has been somewhat documented in places, but I dropped in the motor I've been working on this weekend. It's got Delta cams with the street grind, LW ACT flywheel, and LW Mr. Josh pulley.

Upon driving the car a little, I first got a P1507, Idle Control System Malfunction. I checked the IAC solenoid and valve and they looked OK, I used the lower mileage one. I cleared the code and reseated the vacuum lines going to the IAC. After driving the car a bit more, I am getting intermittent misfires on three cylinders around 2000 RPM. I need to go pull codes again to see if it's consistent (I only have data from two misfires).

The idle is pretty rough. I expected a little bit of a funky idle from the cams but not this bad. What's wrong?

I'm using the intake manifold, plug wires and coil from my '97 motor, with the heads and block from the '98 motor. I read somewhere that the length of the plug connectors could be slightly different... Should I swap the coil and wires?

Or is the combination of cam, LW flywheel, and LW pulley too much and the ECU is just confused? Or should I look at valve clearances again? I was pretty anal when I adjusted them. Timing was dead on as during the install but I guess it could have skipped a tooth, I've heard of it happening before.

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Old 07-15-2008, 11:15 AM   #2
Scooby Specialist
Member#: 36735
Join Date: May 2003
Chapter/Region: MWSOC
Location: Wellington,NZ / Willoughby,OH
99 GF8 Impreza 2.0
2= 1998 BD + BK Legacy GT


Sounds like a timing issue...
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Old 07-15-2008, 08:43 PM   #3
Scooby Guru
Member#: 115154
Join Date: May 2006
Chapter/Region: MWSOC
Location: NYC
2005 Outback XT
White on grey


check for vacuum leaks. You'll throw codes with the cams, even higher likelihood with the lw parts but idle shouldn't be changed that drastically.
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