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When I bought my 84 ELKY 305 v8 last October my my friend and mechanic recommended I get the quadrajet rebuilt. I did for $300.00. My mechanic said it was leaking some fuel and flooding the car when it sat for a while making the motor crank a while before it started. After the rebuild i can't say it started any better.
Last week my mechanic dropped in a rebuilt 35o with a cam (edelbrock RPM performer #7102) and edlelbrock performer intake manifold and ceramic headers.
She runs awesome and has great power. Also has a cool lope! However,it doesn't idle too well and when you turn the AC on it dies. I have turned up the idle speed and replaced the idle stop selenoid and that has helped some but it just doesn't seem to be able to carry any accesory load at idle. I have a stock th 250c tranny and converter.Still cranks a while to start and my mechanic said the carb is still leaking because with the motor warm he saw vapor coming out of the carb. I guess I need to take it to somebody more reputable for a carb rebuild.
Is this normal for a cam motor? Also, still working on the brake vacuum issue. I'm starting to think that for driveability I should have gone with a stock cam. Once the rpms are up she flat gets down to business. Any thoughts and help is appreciated.
Thanks,
RTT
 
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I have a 383 with a 750 Qjet right now but it seems like you're have a timing issue along with a minor carb issue. Nothing too major. Where is your carb leaking from?
 

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I am not very carb savvy but he said he saw vapor coming out of the carb and that indicated it was leaking. R u saying the timing is probably a little off. It doesn't ping or detonate.
I appreciate any advice.\RTT
 
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I am not very carb savvy but he said he saw vapor coming out of the carb and that indicated it was leaking. R u saying the timing is probably a little off. It doesn't ping or detonate.
I appreciate any advice.\RTT
Do you have brake vacuum issues with your 383?
You said it take a bit to crank it which indicates the fuel is getting to the carb but not sparking. It doesn't have to ping for timing to be off though. I dont have any leaks nor vacuum brake issues due to the carb being rebuilt about 3 weeks ago. The float could be set to high causing it to flood. Does it bog out?
There's 2 idle mixture screws at the base of the carb you can adjust too if you know what you're doing.
 

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being in ca. the car wont smog with a cam big enough to effect the brakes.he could have the wrong fuel filter in it. or it could be dripping fuel from the well plugs . the q jets are prone to this. an easy way to tell is after running it for a while turn it off and let it sit for 10 min. then look down the carb throat with the throttle open and see if you have fuel in the bottom of the intake,if you see fuel the carb is leaking
 

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vacuum leak??? did you re-torq the intake after a few heat cycles??:texas:

300$ should have fixed the leaks,, see if there is fuel driping off the boosters in the carb throat at idle??

to see if the well plugs are leaking,, wouldnt you prop the throttle open after you kill it,,before you let it sit??:dontknow:
 

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If the well plugs are leaking, how does that effect performance. Is is just a starting issue? Would that have any effect on my idle issues. Also,I see that edelbrock recommends a 3000 rpm stall for this cam. Can you get one for a th250c?
Thanks,
rtt
 

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same questions

if by perormance you mean idle quality,,gas milage,,hot start problems?? yes
if you mean wideopen throttle runs?? you probly wont notice it.. no vacuum at WFO.

at idle you have vacuum on the bottom of the carb,, it could make it leak more,, idle issues..

i'd just plan on a th350 or an overdrive of your choice..

i dont think the computer will be happy with the cam??
where did he set the timing??
no check engine light yet??:texas:
 

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you got more issues there,,, too big a cam. not enough stall, poor rebuilt carb all add up to trouble, do yourself a favor. look up sean murphy inductions in hunnington beach ca, i got a qjet from him and it runs great, after that see if you still have idle issues , i bet you wont, 285 shipped is what i patd , worth every cent. If you have a ecc carb and computer it will never run right with that cam, loooks like you may have too much cam not enough motor to match sorry :beer:
 

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can you post the specs on the cam card?

if the cam calls for a 3k converter and you have the stock trans and converter, i would expect you to have a idle problem. the converter is to tight and dragging the engine down. i would look into a 350 trans and a 2800-3200 converter.
 

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Spending $300 on a carb rebuild never guarentees it was done correctly.Leaking well plugs means fuel is dripping out the bottom of the fuel bowl into the intake. I haven't touched an idle stop solenoid in years, but I seem to remember that you unscrew the plunger bolt to raise the idle when activated.It,s always good to know what cam specs you have. You may need slightly different timing setting to run best, Also may need idle mixture screws richened(turned out) to achieve maximum vacuum readings.
 

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Sorry to hear about your carb problems, especially after spending 300 bucks. It sounds like you didn't get the best deal for your cash. Quadrajets will leak if the bushings aren't properly done. For a quality rebuild, send it to Sean Murphy Induction in Huntington Beach, CA. Money well spent and professionally done work.
 

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Big cams are notorious for low vacuum condition.
You could try a vacuum reserve reservoir or even some rhoads lifters.
attach a vacuum guage and let us know how much vacuum your pulling.
15-20 would be great..I'm guessing your under 10 psi.
 
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