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Username Post: Tune up procedure        (Topic#341661)
benbuilder 
Forum Newbie
Posts: 86

Reg: 12-06-15
01-03-17 06:50 PM - Post#2669217    

1958 impala 283. I want to tune it up properly. I have the manual, but not sure of the proper procedure. The car runs.
So far:
new plugs, gapped
new wires
new points (gapped)and condenser

Now, what is the order for the remainder, Dwell (I need to buy this meter), carb, and timing?

Thanks




 
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ragtp66 
Contributor
Posts: 555
ragtp66
Reg: 12-09-07
01-04-17 03:51 PM - Post#2669332    
    In response to benbuilder

Set dwell first then timing. Adjust carb last IF needed

Toys:
1958 Impala 2dr Hardtop Under Construction
1966 Chevelle Malibu Convert M20/350 Aztec Bronze
1987 Sea Ray Pachanga 22
2002 Cadillac Escalade EXT Parts chaser
2007 Trailblazer SS -gone and missed


 
carbking 
Senior Member
Posts: 1396
carbking
Loc: Missouri
Reg: 06-14-03
01-05-17 06:55 AM - Post#2669397    
    In response to ragtp66

Adding to the above post:

Adjusting the dwell WILL change the timing.
Adjusting the timing will NOT change the dwell.

This is the reason for setting the dwell first.

Jon.

Good carburetion is fuelish hot air!

The most expensive carburetor you will ever buy.....is the incorrect one you attempt to modify!

If you truly believe "one size fits all", trying walking a mile in your spouse's shoes!


 
benbuilder 
Forum Newbie
Posts: 86

Reg: 12-06-15
01-06-17 12:51 AM - Post#2669581    
    In response to carbking

thank you



 
japete92 
"3rd Year" Silver Supporting Member
Posts: 804
japete92
Loc: No. Virginia
Reg: 01-18-13
01-06-17 09:44 AM - Post#2669635    
    In response to benbuilder

Initial timing is set with vacuum advance disconnected and plugged (just a reminder, you may already know that). You may also need to adjust carb (mostly idle speed) after adjusting the timing.



 
benbuilder 
Forum Newbie
Posts: 86

Reg: 12-06-15
01-06-17 03:24 PM - Post#2669691    
    In response to japete92

Thanks for the help. I do know to plug the vacuum to the dist.

I set the dwell to 30. I then put a paint mark on the timing mark at 4 degrees BTDC. I plugged in my timing light and the mark on the flywheel was off by about 3". as I move the distributor to my timing mark, the engine seems to run worse. I cannot set the timing to the factory specs and think it is running correctly.

Any suggestions? I do not know the history of this engine. I do know this car was pristine 25 years ago when it was in an auction in new jersey, it was then bought by my uncle who is an exceptional mechanic and car collector. He never touched it. He let it slowly deteriorate as it was not one of his better cars. I bought it 15 years ago and did nothing with it till recently. So I do not know if the distributor was ever removed and not installed correctly.





 
ragtp66 
Contributor
Posts: 555
ragtp66
Reg: 12-09-07
01-06-17 09:02 PM - Post#2669757    
    In response to benbuilder

When you said the timing was off by about 3" was is advanced or retarded ? When you have the timing mark lined up does the car crank over nice and smooth before it fires or does it kind of hesitate almost as if it had a low battery for a second then crank normally? If yes than I would agree and say your distributor may be off 1 tooth. USUALLY the window for the distributor ends up pointing towards the 2/4 cylinders.

The shop manual shows the #1 plug wire location in a different spot on the cap for 283 vs 348.

283 it shows the #1 plug to be the terminal to the LEFT of the points window and #2 to the RIGHT of the window.

348 it shows the #8 wire to the LEFT of the window and #1 to the RIGHT of the window.

In actuality as long as the rotor tip lines up with whatever terminal the #1 plug is connected to it should be fine. (assuming the #1 piston is at TDC on the compression stroke.)

I am sure there was SOME reason why they are in different spots but I don't know what it is. My guess is to allow the vacuum advance enough room to swing either direction with out hitting the coil or valve cover but I am far from a GM Engineer.

chris

Toys:
1958 Impala 2dr Hardtop Under Construction
1966 Chevelle Malibu Convert M20/350 Aztec Bronze
1987 Sea Ray Pachanga 22
2002 Cadillac Escalade EXT Parts chaser
2007 Trailblazer SS -gone and missed


 
benbuilder 
Forum Newbie
Posts: 86

Reg: 12-06-15
01-07-17 02:37 AM - Post#2669792    
    In response to ragtp66

USUALLY the window for the distributor ends up pointing towards the 2/4 cylinders. THIS IS EXACTLY WHAT I HAVE

283 it shows the #1 plug to be the terminal to the LEFT of the points window and #2 to the RIGHT of the window. THIS IS EXACTLY WHAT I HAVE

LAST NIGHT, IN ORDER TO BE SURE I HAD NOT CROSSED OR MISINSTALLED WIRES, I CUT LOOSE ALL MY ZIP TIES I USED TO NEATEN THINGS UP.

THIS MORNING I INSTALLED A TIMING TAPE TO TELL EVERYONE EXACTLY HOW MUCH I WAS OFF BY. WHEN I STARTED THE ENGING, I WAS SURPRISED TO SEE THAT I HAD ADJUSTED THE ENGINE TO "SOUND RIGHT" AT EXACTLY WHERE THE TIMING SHOULD BE. 4 DEGREES ADVANCED.

COULD THE ZIP TIES, WHICH FORCED THE WIRES TOGETHER, HAVE BEEN THE PROBLEM?






 
0utlaw 
Very Senior Member
Posts: 2768
0utlaw
Loc: US East Coast
Reg: 09-10-02
01-07-17 04:39 AM - Post#2669797    
    In response to benbuilder

Don't know why zip ties would cause a difference, but maybe....
I have found that even brand new wires can go bad quickly. When you are pulling the plug wire off to recheck a plug, it is easy to pull the wire out of the connector. You would never know this because you cannot see this inside the boot and the wire may work by jumping this gap... unless it finds a better path through another wire or metal ground conveniently close. In this case zip tying them together could cause a problem. (It is relatively easy to recrimp it and make it new again.)
So... if you have any kind of skip, you can check the wire easily without removing the wire, using an ohmmeter connected to each end. You sometimes can see a corona of sparks running your engine in the dark...indicating energy loss.
OUTLAW




 
japete92 
"3rd Year" Silver Supporting Member
Posts: 804
japete92
Loc: No. Virginia
Reg: 01-18-13
01-07-17 08:03 AM - Post#2669813    
    In response to benbuilder

You may have spark 'jumping' from one wire to another with them 'bundled together'.

Attached is how GM ran the wires on a sb (its from the '63 assembly manual, but I think your car is the same).

Certainly that's not the only way to run wires, but it is one way that should work. Notice the attempt to keep some separation.

Hope this is helpful.



Attachment: v8_plug_wires.pdf (175.59 KB) 24 View(s)



 
ragtp66 
Contributor
Posts: 555
ragtp66
Reg: 12-09-07
01-08-17 12:41 AM - Post#2670023    
    In response to 0utlaw

When you zip tied the wires together you may have accidentally got them too close together. The most likely culprit would be the #8 & #4 wires or the #5 & #7 since they follow each other in the firing order and route to the same banks of cylinders. Sometimes called cross firing. When you got rid of the ties it cured the problem. You can check the wires for proper resistance and see if they ohm out OK. Or for more fun take a water spray bottle and lightly mist the wires with water then fire it up and look for the snap crackle and pop easier to do if its dark outside, look for blue sparks/arcs. OR if you want to ratchet the fun up a notch or two ask your friend/neighbor/wife/girl friend/teenager to hold a wet wire while you crank it, do this one at a time until THEY find the bad wire.....they will let you know loud and clear which one is bad.

*** Not responsible for any damaged paint, lost tools, hospital bills or divorce court costs due to the above mentioned testing method.

Toys:
1958 Impala 2dr Hardtop Under Construction
1966 Chevelle Malibu Convert M20/350 Aztec Bronze
1987 Sea Ray Pachanga 22
2002 Cadillac Escalade EXT Parts chaser
2007 Trailblazer SS -gone and missed


 
benbuilder 
Forum Newbie
Posts: 86

Reg: 12-06-15
01-09-17 02:05 PM - Post#2670301    
    In response to ragtp66

Thanks for all the help guys.

I have been jolted by a wire a couple of times.

Its a good feeling when things start to go as they should.



 
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