Noticing small things...missing something, or is this motor on its way out? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-07-2010, 07:59 PM
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Noticing small things...missing something, or is this motor on its way out?

Ok, been noticing a few things with my daily driver. First off, .030 pontiac 400, edelbrock intake, mild cam, 6x-4 head, headers, 3.73 gears.

Ok, over the past couple months ive noticed a few problems. Gas milage has gone to poo, doesnt seem like its making the power it used to, and the idle sounds A LOT choppy-er (although, thats not a bad thing!) and it uses about half a quart of oil every two weeks or so.

Ive changed the plugs, wires, cap, coil, reset the timing...about everything i can think of, with no avail!

it doesn't seem to rev like it used to, so I'm thinking valve springs. But, could valve springs cause these issues?

or am i missing something?

Or is this engine about to crap out on me?

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Old 10-07-2010, 08:44 PM
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Before I tore into it I would do a compression test, warm it up first. Could be a stuck valve, broken ring, flat lobe...who knows. Is it overheating? do you see blue smoke on just start up or all the time? Oil has be going somewhere.
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Old 10-07-2010, 09:13 PM
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Not overheating, running about the same temp as usual. Don't see any smoke, except for when it gets really revved up, then it puffs a tiny bit of smoke.
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Old 10-07-2010, 09:25 PM
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If it's .030 over someone has been in there before. When was it done? How many miles on it?
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Old 10-07-2010, 09:33 PM
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It was built in '96, drove one year, then was parked until i bought it in 2002. Has about 25k on the rebuild.

When it was taken out it was a full rebuilt, new crank, rods, pistons, cam, lifters. heads reworked, valves ground, seats ground, guides replaced...the works.
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Old 10-07-2010, 09:37 PM
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Are you sure a new crank and rods were put in 96 or were they reconditioned? How many rpms were you running the engine? You must have been zinging it with 3.73 rear end gears.
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Old 10-07-2010, 09:40 PM
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New crank and rods...from eagle.

It turns about 2700 at 65, has a pretty tall rear tire.
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Old 10-07-2010, 09:42 PM
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I could be wrong but I don't think Eagle cranks were avalable for a Pontiac in 96.
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Old 10-07-2010, 09:45 PM
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The writing on the build sheet is hard to read, it looks like eagle. I know the guy that built the engine, i could ask him sometime.

but anyway...
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Old 10-08-2010, 08:36 AM
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Like 327nut said "do a compression test". Do also what is called a compression leak down test. If a cylinder wont hold compression, squirt some oil in it and try the leak down test again, If it holds compression longer after you squirt oil in, the rings are going/gone. If it makes no difference than the problem is in the valve train.
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