So I've got a 1987 325 (eta motor). Recent build on the motor, mainly stock, but balanced bottom end and a mild port/polish on the head (just a polish, really). Headers and 2.5" exhaust, Jim Conforti chip, but everything else is bone stock right now; just nice and fresh.
Suddenly I've got this driveability problem. Until about 4k, the motor revs very sluggishly and bogs a lot. As soon as you hit about 3-4k, the engine revs smoothly and powerfully right to redline.
The problem is not coincidental with the recent work; it started a while after all of the goodies.
AFM tests out fine, as do resistance checks of the crank engine speed sensor, the ignition components (all of which are new anyway), the air temp sensor, etc.
It doesn't appear to be a fuel issue, since the pressure regulator and all of the injectors (including cold start) test out fine. Also, the plugs are a beautiful chocolate brown, so no rich or lean indication there. No rich exhaust smoke or anything of that nature.
I'm thinking that something must be f'ed up with the ignition timing somehow... Any ideas? Anybody had a similar problem?
Thanks a million.
Suddenly I've got this driveability problem. Until about 4k, the motor revs very sluggishly and bogs a lot. As soon as you hit about 3-4k, the engine revs smoothly and powerfully right to redline.
The problem is not coincidental with the recent work; it started a while after all of the goodies.
AFM tests out fine, as do resistance checks of the crank engine speed sensor, the ignition components (all of which are new anyway), the air temp sensor, etc.
It doesn't appear to be a fuel issue, since the pressure regulator and all of the injectors (including cold start) test out fine. Also, the plugs are a beautiful chocolate brown, so no rich or lean indication there. No rich exhaust smoke or anything of that nature.
I'm thinking that something must be f'ed up with the ignition timing somehow... Any ideas? Anybody had a similar problem?
Thanks a million.
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