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Old 03-23-2011, 12:30 PM
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Need help - starting issues

Ok, I have a ZZ4 350, GM perf crank, World Products heads, Comp Cam Thumpr, Edelbrock air gap & 1406 600 carb.

I adjusted the elec choke like the Edelbrock tech said to.
Engine cold & no power to choke, turn housing to close flap..back off to make 1/8" - 3/16" gap.

Timing is set at 10 degrees. I had issues w/fuel dumping into the carb. I have the Carter universal elec pump (7psi) I installed a psi reg. Promblem there is solved.

When I try to start it, it will fire up, but dies..i try to restart & it fights me & will not start. If you have someone messing w/the carb & you turn the key it will fire up & run. It just seems really cold natured.

What is throwing me is, I had a 4.3 V6 in it before that I had the same carb on (I swapped motors & reused the carb was about 6 months old) & it would fire up not prob & idle just fine, got in it & go.

What could be the problem? I am afraid of burning up the starter or killing my battery..

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Old 03-24-2011, 07:44 AM
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Anyone have any thoughts? I'm ready to drive this thing, but don't want to be stranded.
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Old 03-24-2011, 07:51 AM
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not starting

this most likely is not the problem.. but... i also have an airgap intake.. and had problems starting/running.. what i did is pull the carb and that slot that is cut away in the middle?? fill it !!!!! I just used thin sheet mtl and curved it over so it looked like a "J". part slipped under and the other part rested on the base so as not to fall into the intake... solved my problem... how u know what i'm say'n anyways....
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Old 03-24-2011, 07:51 AM
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Verify TDC, make a timing tape, set the base timing to 18-20 BTDC. What is the ignition system on this mill?
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Old 03-24-2011, 08:08 AM
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Just a reg HEI distributor..

TDC is correct, I was told.

So set the timing at 18-20 degree?
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Old 03-24-2011, 08:10 AM
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Old 03-24-2011, 08:11 AM
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I am not really familiar with eddy carbs, but holley's have a fast idle adjustment for the choke circuit. This is different from the curb idle, which is adjusted when the engine is hot. Try going down on the fuel pressure. Though I have holley's, I am only running 4.5 psi. Doesn't take much to over ride the needle and seat and flood.

The next time you have trouble starting it, pull a plug or two and see what they look like. If they are black it is probaly flooding. Might want the put a new set in before adjusting the carb anymore. Can't hurt. Gap them to about 35 for starters.

May want to give it a little more timing.

Are you sure your throttle cable is adjusted correct?
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Old 03-24-2011, 08:17 AM
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my KARMA ran over my DOGMA
 

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Sure looks like its ready to run nice job. Yep you should give it a try, just get a timing light and advance the timing some see if this improves things at idle. Are you running manifold or ported vacuum to the dist vac advance? it would also be a good idea to get a good vacuum gage and measure vacuum levels at idle while you are trying to tune it.

How big is the cam? what duration and lift?

Last edited by Custom10; 03-24-2011 at 08:23 AM.
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Old 03-24-2011, 08:23 AM
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The dizzy is hooked to the pass side..I guess the timed port?



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Old 03-24-2011, 08:26 AM
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This was the 4.3 I had..I got the 350 for a steal & couldn't pass it up.

The motor stuff really isn't my forte', mostly suspension & body mods I know.


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Old 03-24-2011, 08:33 AM
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Oh yeah my freind you are going to need way more than 10 btdc on that cam more like 18-22 so you will need to limit the mechanical advance and most likely the vacuum advance.

Do you have a timing tape on the damper that goes to say 60 or a dial back light?

Set the base to 20, limit the mech advance to add another 14-16, then limit the vacuum advance to another 12 for a total of about 48 tops.

Yes the pass side is ported vac, try switching to manifold vac, the port is lower on the carb base and is on the drivers side.

Has the lifter preload been verified correct? What is the compression ratio of this mill?

Last edited by Custom10; 03-24-2011 at 08:39 AM.
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Old 03-24-2011, 08:38 AM
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Don't know what lifter pre-load is..??
I don't the compression either.

Last edited by RickyDoors; 03-24-2011 at 08:44 AM.
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Old 03-24-2011, 08:44 AM
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Well one thing at a time then. The preload is the amount that the lifter plunger is depressed into the lifter bore when the cam lobe is on its base circle. This is set via the adjustable nut on the rocker arm. There are a number of ways to do this will a hyd ft cam. If incorrect you can have problems with the valve timing which will cause very poor running. Lets leave that for now.

Do you have a timing light?
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Old 03-24-2011, 08:47 AM
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I can get one..it's roller rockers if that matters.
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Old 03-24-2011, 08:49 AM
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I really appreciate the help..
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