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A26B · 07-25-2007

I'm a little confused with the "short runner intake." What exactly is that?

Your problem, being intermittent and worsening, sounds to me like an electrical issue. Loose connection, bad ground(s) or open/short in the harness. Part of it sound like it's restricted to closed loop except that once you reach 5000rpm it craps out again. If it were O2 sensors, you should have a code, same as with any other sensor.

I'm leaning towards a bent pin on the ignition module (easy to do) or bad ground(s). If you could data log, you might be able to chase it down.

If you have acess to another known good ECM, I would suggest trying that too.

07-25-2007	#5
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,403	Re: A serious problem I'm a little confused with the "short runner intake." What exactly is that? Your problem, being intermittent and worsening, sounds to me like an electrical issue. Loose connection, bad ground(s) or open/short in the harness. Part of it sound like it's restricted to closed loop except that once you reach 5000rpm it craps out again. If it were O2 sensors, you should have a code, same as with any other sensor. I'm leaning towards a bent pin on the ignition module (easy to do) or bad ground(s). If you could data log, you might be able to chase it down. If you have acess to another known good ECM, I would suggest trying that too. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.