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Username Post: SBC 350 locating TDCC and aligning rotor correctly other misc issues        (Topic#331459)
Bennybone 
Forum Newbie
Posts: 22

Reg: 12-21-15
01-13-16 01:42 PM - Post#2601818    
    In response to 0utlaw

Ignition Man and Outlaw - excellent plans I will follow and report back.

The issue I have with running up idle (HOT) is when I go into gear the snap on the transmission is violent, I cringe when that happens and don't know that I can live with that on a car I'd like to see become a daily leisure driver.



 




raycow 
Honored Member
Posts: 27766
raycow
Loc: San Francisco, CA
Reg: 11-26-02
01-14-16 08:16 AM - Post#2602000    
    In response to Bennybone

After adjusting the carb for max vacuum at idle, you still have to reset the idle speed to spec to prevent the problem you are seeing with the trans.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
IgnitionMan 
Valued Contributor
Posts: 3412

Reg: 04-15-05
01-14-16 10:37 AM - Post#2602043    
    In response to Bennybone

Adjust the idle speed AS you are adjusting the fuel screws, adjusting the idle speed AFTER the screws will force you to readjust the idle mix screws, over and over again. Set idle speed first, work from there.



 
Bennybone 
Forum Newbie
Posts: 22

Reg: 12-21-15
01-14-16 10:59 AM - Post#2602047    
    In response to IgnitionMan

What is the best resource for adjusting a Quadrajet?

I asked for an updated tech paper from Lars however he states a remanufactuered Qjet isn't tunable and to shelve it.

I'm happy with the initial carb performance with the exception of the automatic choke which doesn't seem to be functioning so I have it disabled.

In order of priority my plan is:

Install a vacuum advance stop and time the engine to its best baseline performance off full manifold vacuum.

Fix the automatic choke

Solve the temperature issue I am experiencing since I put in a thermostat and new radiator and new cap

Then tune the carb



Edited by Bennybone on 01-14-16 11:00 AM. Reason for edit: No reason given.

 
LUVmachine 
Frequent Contributor
Posts: 1453

Age: 36
Loc: Redding Ca
Reg: 10-02-14
01-14-16 08:48 PM - Post#2602166    
    In response to Bennybone

I haven't been following this too closely but if you are having temperature issues I would be willing to bet if you tune your ignition system the way ignitionman is telling you to do there is a pretty good chance your temperature issues and some other problems you are having will be solved.

71 Chevelle BBC powered
71 C-10 454 with weiand 177 (SOLD)
72 406 sbc powered Chevy LUV sleeper (SOLD)
2010 GMC Sierra crew cab 4X4
http://s626.photobucket.com/user/GJohnson81/libra r...


 
Bennybone 
Forum Newbie
Posts: 22

Reg: 12-21-15
01-19-16 04:22 PM - Post#2603369    
    In response to LUVmachine

So I did a home made pin stop for 10 degrees of advance for q total of 20 at idle on manifold vacuum.

When I installed the vacuum canister the arm didn't clear the metal stop, so I uninstalled and ground down the height of the metal stop until sufficient for the arm to swing over and move the pin freely to the stop. I noticed the new distributor had a lower clearance here than another distributor on hand.

Car runs good I'm ready to fix electric choke and tune the quadrajet - still no guides for this please post a link.

Also the car still is going hot - the day I test drove it was 35 degrees and temp went to 235. Gauge still bobs between 190 and 230 for no apparent reason (like air in the system), the cap is tight the hoses tight and i tried burping the car 4 times on ramps.





 
models916 
Valued Contributor
Posts: 4785

Age: 67
Loc: Addison, IL
Reg: 05-28-10
01-20-16 06:43 AM - Post#2603466    
    In response to Bennybone

Disconnect the vacuum advance and set the timing on a damper tape for all in at 38 degrees, 3,000-4,000. Then work from there if needed.



 
0utlaw 
Very Senior Member
Posts: 2793
0utlaw
Loc: US East Coast
Reg: 09-10-02
01-20-16 09:37 AM - Post#2603481    
    In response to Bennybone

Electric chokes are a little bit difficult to set up and rather critical on a quadrajet. If you have the butterfly too tight, you get too much gas and stumble. If it is too loose, you get backfiring, hesitation or stumble. And simply firing up the car, you only get one chance of getting it correct. SO...
Here is a simple tip. Cold engine...do not start, do not allow fast idle screw to rest on step cam of choke by putting a wedge ( tiny piece of wood works) between the throttle and hot idle screw..choke should close.
loosen choke housing and adjust the housing until the choke plate lightly closes and has some finger resistance. Snug down screws. Now remove plus wire from choke. Substitute a hot wire from the battery. You can then watch the choke action. It should open slowly and be fully open (vertical) in approximately 6 or 7 minutes. If it opens too soon, adjust it tighter. Too slow, adjust it looser. While doing this, watch the step cam to make sure it is free. Let choke housing cool off.
Remove the wood wedge you put on the throttle...reconnect your choke wire and fire it up. You can tweak the choke from there in small increments.



 
Bennybone 
Forum Newbie
Posts: 22

Reg: 12-21-15
01-20-16 03:17 PM - Post#2603526    
    In response to 0utlaw

Thanks for the in depth clarification.

I've connected a switch 12 volt source to the choke connection - 12.4 volt measured and when connected the voltage reads 1.86 volts.

To date the choke hasn't fluttered no matter the position.

Will running a constant 12 volt source make any difference and is the load supposed to drop when connected or did I get a bum e-choke ?



 
0utlaw 
Very Senior Member
Posts: 2793
0utlaw
Loc: US East Coast
Reg: 09-10-02
01-20-16 03:49 PM - Post#2603533    
    In response to Bennybone

If you do not have one, you may need to run a short wire from the other choke terminal to ground ( one of the housing screws should be good)
or verify the wire you have is connected.
Then check with meter.



 
raycow 
Honored Member
Posts: 27766
raycow
Loc: San Francisco, CA
Reg: 11-26-02
01-21-16 11:24 AM - Post#2603656    
    In response to Bennybone

  • Bennybone Said:
I've connected a switch 12 volt source to the choke connection - 12.4 volt measured and when connected the voltage reads 1.86 volts.


If you are seeing 12.4V on the unconnected wire and only 1.86V when it is connected to the choke terminal, this means you have a lot of resistance somewhere between the switch and the choke. As a test, connect the choke wire directly to battery power and see what you get.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
new in 62 
"4th Year" Silver Supporting Member
Posts: 25
new in 62
Age: 75
Loc: Alberta Canada
Reg: 10-13-15
10-25-17 09:53 PM - Post#2712198    
    In response to Bennybone

Try disabling your rockers your exhaust valve could be hitting the piston stop while it is opening & that is where you will stop turning by hand but the piston stop did not contact the top of the piston try marking again with rockers disabled.I found out an easy method of centering your 2 marks lay a strip of paper on your balancer one end butted up to one mark & cut the other end off on the other mark fold this piece exactly in 1/2 lay it back on the balancer against a mark & mark the other end this will be your TDC mark.new in 62.



 
65_Impala 
Very Senior Member
Posts: 4071

Reg: 12-29-02
10-26-17 12:11 PM - Post#2712242    
    In response to new in 62

  • new in 62 Said:
Try disabling your rockers your exhaust valve could be hitting the piston stop while it is opening & that is where you will stop turning by hand but the piston stop did not contact the top of the piston try marking again with rockers disabled.I found out an easy method of centering your 2 marks lay a strip of paper on your balancer one end butted up to one mark & cut the other end off on the other mark fold this piece exactly in 1/2 lay it back on the balancer against a mark & mark the other end this will be your TDC mark.new in 62.




It's been a year and 9 months since the last response. I really hope he got it figured out by now.



 




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