General Category > Quadrajet Carb Talk and Tips

idling issues

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j_oetjens:
carb 7045183 on  a 1970 olds 455 camshaft xe284h lca 110 duration 0.050 intake 240 lift 0.541 exhaust 246 lift 0544 heads are factory ported E heads 403686 77cc 2.000'' intake valve 1.625" exhaust valve 5 angle valve job flat top pistons are flat top did not have compression checked machine shop said probaly around 10.5 - 11.0 compression 2500 tight stall converter on a th400 i have d.u.i distributor msd 8.5 wires ac delco plugs intake manifold Single plane with divider  Professional Products CrossWind

i have a holley 800 spreadbore that i have rebuilt and adjusted to work with my engine with zero problems with air fuel ratio of 13.3 equal on each side. i have never been able to run a quadrajet on my engine which i would perfer until now. i purchased your book and i have since, at least got my car to start and stay running after drilling idle bypass to 0.203 here is a list of everything else:

down channel: 0.0625
upper idle air:  0.787
lower idle air:  0.787
idle bypass:    0.203
idle mixture screws: 0.0197
butterflies:      0.0937
hanger F
secondary rods 0.0394 smaller and 0.0472 larger tubes
secondary spring tension 1/8 turn
 
i was unable to remove idle tubes to be able to drill them out as well i have removed primary rods and have no choke it will run with idle set at 1000 rpm (seems way to high) with nozzle drip if i lower the idle to 850 (where it is set on my holley with no problems) engine slowly drops to 500rpm and then will die after about 5 minutes. idle bypass was at 0.1875 and would not stay on unless pumping gas so i removed the primary rods and it stayed running but with idle set at 1000 rpm but with tons of nozzle drip and when i put it in gear it would die.

do you have any suggestions?????

http://www.youtube.com/watch?v=QWSxxq2ol0s

link to car running with holley carb

429bbf:
welcome aboard . from my personal ex.i think you can do all the other mods you have done . but without increasing the size of the idle tube the rest is not going to do any good until you get the right combination.i have very good luck pulling them and reinstalling.theres always junk under them that i cant get out .im sure cliff will chime in and know exactly whats wrong.hope this helps. dean

j_oetjens:
thank you for your reply  ;D

j_oetjens:
finally got idle tubes out increased size to 0.0396 still was dripping from boosters so increased to 0.0472 only dripping very little from passenger side increased timing from 6 to 10 degrees idle set at 950 drops to 750 in gear passenger booster still wet and very slow drip idle mixture screws 2 1/2 turns secondary spring tension dropped to 1/16 short road test in neighborhood car launches harder then with the holley.  now only 2 things the slight drip from passenger booster and  new problem after I range car had to wait 15 - 20 minutes before I was able to start the car back up it wouldn't even turn over I am thinking it needs more ground

429bbf:
good news at least your on the right track .you may try screwing the passenger idle screw out another round. they do not have to be the equal the engine will tell you where they need to be. i believe most peple think they have to be set the same .but when you finally get one tune i found they are very seldom the same .dean hope this helps

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