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Old 08-06-2012, 07:08 PM
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You can rotate the oil pump shaft with a screw driver, but to be honest, I've never had to....... a simple lift, twist, drop of the dizzy body, then jiggle the rotor....kinda all at the same time...... don't know why..... it works for me every time....... but if you can't get the feel of it, the pump shaft rotates very easy with a screwdriver. When I rebuild an engine I always prime the oil galleys by using a cut off screwdriver and a drill, before I drop in the dizzy.
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Old 08-06-2012, 08:57 PM
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we did alot of work today. We cleaned all of the spark plugs and re gapped them. we adjusted the idle down so we could time it at a lower idle. we timed the motor to 12 and it is running pretty good. It is no longer backfiring and we leaned out the carb so it wont run so rich. We have one major problem now. After it is running for a 10-20 mins and we shut it off. we sometimes lose the starter, like no power to the starter what so ever. Does anyone know what this could be?

thanks for all your guys help!!!
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Old 08-07-2012, 04:05 AM
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My guess is starter soak, very common on GM starters, but before I went got a new starter, I'd make sure all my cable connections were clean and tight, if that doesn't fix it ...... probably a new starter is in order....... could be the solenoid or the bendix, but nowdays it's easier just to buy the whole thing with a life-time warrenty.
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Old 08-15-2012, 05:34 AM
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Timing

I played with alot of 389 and 400 Pontiacs in my earlier years. The problems you are describing usually showed up just before the timing chain slipped on the cam gear and it would not run at all. Pontiac liked to put a nylon coated cam gear in these engines to reduce noise. By coated I mean the teeth were mostly nylon. Or plastic, whatever you want to call it. When they got some age or wear on them the nylon started to break off in chunks. Resulting in timing issues. No power. Running on after the key was shut off. Running hot. Unable to keep it in time. If this turns out to be your problem I suggest a full metal gear set and the issue will never come up again.
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Old 08-15-2012, 06:21 AM
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gem

that car is a gem. the hidden headlights make it look really nice and increase the value greatly. HANG ON TO IT!

forgive me if i'm covering old ground. no time to read the entire post... make sure that coil is good. my lawn tractor began backfiring and i replaced the coil which stopped the problem. make sure the distributer cap is not cracked. do a compression test.
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Old 08-15-2012, 06:50 AM
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re: starter

I have found that sometimes there is oil between the starter housing and the block (thus, no ground). To be sure, drop the starter enough to wipe those surfaces till they are clean. Brake cleaner or carb cleaner. I go the extra step and take the bolts out (1 at a time so you don't have to drop the starter) and clean the threads on the bolt and in the bolt holes. It's sounds elementary, but it's happened to me on more than one occasion. To me, that's reason enough to give it a try. If it doesn't change or fix the problem, then you've eliminated one more possibility.
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Old 08-15-2012, 01:28 PM
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The best way is to strip the motor and do the rings and bearings with a piston clean.Then do the valve grind on the heads and replace all gaskets.Looks like you may have had a few over-heating problems.A compression test is used to find a blown head gasket or valve leaks.And replace all the frost plugs.A cam grind or replacement while its apart is good,as well as new lifters.You don't need the hi-perf stuff for that size motor...just a quick little clean-up build with cheap standard replacements should do....and just look after the daily runner until you can big spend on the blown jet engine .

Last edited by freecontact; 08-15-2012 at 01:37 PM. Reason: spelling
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Old 08-16-2012, 04:17 AM
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Dude, before you go rebuilding the entire engine..... do a compression test, and check the starter!
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Old 08-16-2012, 08:48 PM
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Beautiful car! It's my favorite year GTO. I'm pretty confident that once you get past these issues you're facing and get it running right you won't look back at Chevy. You'll be quite happy with the torque from that 400.
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Old 08-17-2012, 10:55 PM
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Quote:
Originally Posted by BRNFND GTO View Post
... After it is running for a 10-20 mins and we shut it off. we sometimes lose the starter, like no power to the starter what so ever...
Quote:
Originally Posted by EOD Guy View Post
My guess is starter soak, very common on GM starters, but before I went got a new starter, I'd make sure all my cable connections were clean and tight, if that doesn't fix it ...... probably a new starter is in order....... could be the solenoid or the bendix, but nowdays it's easier just to buy the whole thing with a life-time warrenty.
In addition to EOD Guy's suggestions:

I can't see from the photos -- does it have headers, or OEM cast-iron exhaust manifolds? Headers are notorious for exacerbating the heat-soak problem. Some kind of heat shield between the exhaust and the starter can be helpful. I also used extra large battery cables that I made from 1-gauge welding cable.

The negative terminal should be wired directly to the engine (there should be a stud on the cylinder head for it.) A separate ground strap connects the engine to the body sheet-metal.
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Old 08-20-2012, 11:24 AM
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Pontiac timing

With the cap off, try turning the rotor in a counter clockwise direction. Assuming it turns, when you release it it should snap back, indicating that the advance is not locked or frozen it is not. If it has very low resistance, someone may have put very light springs in the advance. This would cause it to have full advance at idle. Without having the vacuum advance connected, advance the timing to 30 degrees. If this solves the problem, the distributor needs to be serviced. This is the same advice that Mr. Wizard gave me
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  #27 (permalink)  
Old 09-19-2013, 03:31 PM
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I don't remember if my 70 GTO had a soliniod metal cover on it to keep the heat off it but if you removed it put it back on or get one for it.

Whats the word on the car??
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1968, gto, pontiac, rebuild, timing

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