Author Topic: 78 been sitting 10 years  (Read 1870 times)

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Offline Klatt87

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78 been sitting 10 years
« on: July 30, 2022, 05:06:09 PM »
I plan on bringing a trans am home thatís been sitting for a decade. Do I just change all the fluids before trying to start it? How about the gas? Spark plugs? Thank you !

Offline RENOVATIONS

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Re: 78 been sitting 10 years
« Reply #1 on: July 30, 2022, 05:25:48 PM »
I would definitely get some oil into the cylinders before trying to start it in case the rings have frozen too the bores.
Jeff

Projects:
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1978 Trans Am
1970 Camaro
1970 'Cuda
1987 Fiero GT
1982 Trans Am
1986 Corvette

Offline Wallington

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Re: 78 been sitting 10 years
« Reply #2 on: July 30, 2022, 07:38:06 PM »
You'll definitely want syphon and drain any fuel.

Offline wheels78ta

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Re: 78 been sitting 10 years
« Reply #3 on: July 31, 2022, 07:44:19 PM »
Pull spark plugs and squirt some oil in all cylinders.  You can put the plugs back in but only thread them in a turn or two.  This will keep any debris from getting into the cylinders.  Let it sit for a couple of hours.  Try to turn it by hand.  With the plugs only in a turn or two their shouldn't be any compression.  If it will turn by hand.....let it sit some more.  If it won't turn by hand then let it sit over night.  There is plenty of other things to do while it sits with oil in the cylinders

Complete tune up.......Plugs, wires, cap and rotor.

Check gas tank.  If any fuel is there.......drop tank and clean it out.  That fuel will be wasted.  If there is no fuel....get a scope and put into the tank and check for rust or crust.  If any rust or crust then remove gas tank and clean or replace.  Check fuel lines.  Change fuel filter.

If you can't turn engine by hand after sitting for a while, and you can't scope the cylinders to see what they look like, take out a couple of spark plugs.  Just make sure there is nothing that can fall into the spark plug hole.  Try turning over by hand.  If still not moving then you may need to remove the heads to check the cylinders.

Forcing a stuck cylinder(s) could cause damage to the cylinder walls.

Let us know how it turns out.

Any questions, please ask.  Someone will chime in to assist.

« Last Edit: July 31, 2022, 07:46:36 PM by wheels78ta »
1978 Y88 W72 WS6 4-SPD 79,000 miles
1987 Chevy K5 Blazer 7.4L Vortec 4x4
2005 Chevy Suburban 2500 8.1L Vortec 4x4
2006 Chevy Silverado Z71 5.3L Vortec 4x4

Offline Klatt87

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Re: 78 been sitting 10 years
« Reply #4 on: July 31, 2022, 08:57:55 PM »
This is awesome feedback man Thank you so much. I pulled the tank and I am just going to get a new tank and sending unit. Going to flush the fuel lines up to the fuel pump to make sure they are good. Previous owner said he had it turning over. So I just pull plugs and throw some marvel in there eh? And a big ratchet on the bolt thatís on the front of the motor correct? I also plan on doing plugs wires all new coolant new fuel pump. Iím trying to find a new carb or someone to rebuild mine. Any leads on that?
I am assuming make sure it turns over before I go ham and buy all this stuff lol.

Offline wheels78ta

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Re: 78 been sitting 10 years
« Reply #5 on: August 01, 2022, 05:10:50 PM »
Spray some WD40 or other type of lube/oil in all cylinders and use wrench on harmonic balancer bolt.  If it turns freely then cylinders should be good.  You don't need to spray a lot of WD40 in the cylinders.  Just enough to cover the walls.
1978 Y88 W72 WS6 4-SPD 79,000 miles
1987 Chevy K5 Blazer 7.4L Vortec 4x4
2005 Chevy Suburban 2500 8.1L Vortec 4x4
2006 Chevy Silverado Z71 5.3L Vortec 4x4

Offline eviledolean

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Re: 78 been sitting 10 years
« Reply #6 on: August 07, 2022, 10:58:16 AM »
Defiantly change out the fuel.  I spent two months, trying to diagnose why I was having so many problems getting a project Pontiac 350 to run properly, just would not stay om for me.  Finally, I come home from work one day, and notice a leak coming from the back of the car, the darn tank had actual rusted through in one spot and fuel was running out.   Pulled the tank, OMG what a nasty mess of rust, sludge and bad fuel.   Messed up my new rebuild on a Edelbrock carb I had just done.    Anyway, I finally pulled that engine out and will install a 400 with a quotrojet and new Fuel tank, sender etc. in place.   Bet it starts right up.  LOL.
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