my new 360 wont idle

[nrt69]

i got my new 360 to fire up but i cant get it to idle for nothing. ive adjusted the timing back and forth and completely cleaned and rebuilt the carb.

any suggestions?

[b5blue]

What carb.? Ignition and dizzy? Type of choke? Ignition first then carb. Base line throttle linkage settings as you may be into secondary's, check for vacuum leaks, A/F mix too lean? 

[nrt69]

eddy 650 cfm, manul choke, fuel mix and idle screws set up per eddy instructions.
mopar performance electronic conversion with about 90k miles on it (it worked fine with my old motor)

[y3chargerrt]

Are you monitoring your vacuum as you tune?

[Steve P.]

9 out of 10 times I find a vacuum leak causing the issue. Monitoring timing and vacuum are essential. I would start with pulling and plugging all vacuum hoses at the carb and base. Fire it up and see what you've got. If it still won't idle, use a light spray of carb cleaner around the base of the carb first. Try to be specific where you aim as it will point out where the the problem is if in fact it's a leak.

[nrt69]

what do you mean by monitor vacuum? ive plugged all the vacuum ports and it still wont do anything. everyone is telling me timing, but ive rechecked TDC and firing order a billion (not literally) times.
someone said the balancer marks could be wrong?
carb is flush with intake and theres a new gasket under it.
i do have a slight kink in the stock 5/16 metal fuel line that runs to the intake, where it then goes into a filter, then 3/8 hose to the carb. i cant see the slight kink cutting off that much fuel at idle though.

[randr]

adjustment screws on those carbs or only really for idle. if you turn each side in on at a time does rpm go down? if not one side or other is plugged. or one hell of a vacuum leak

[y3chargerrt]

Do you have a timing light and a vacuum gauge to tune it with?

[nrt69]

yes,rpm will go down turning them in. i have them set at 1.75 turns from bottom. eddy says 1.5-2.0 turns from bottom.

i put a timing light on it tonight (no advance dial). i made some makeshift timing marks on the passenger side since my timing cover marks are under the water pump hose and power steering resovoir. at @1100rpm i estimate im at 20+ degrees BTDC.

i dont have a vacuum gauge. where would i hook one up at?

[nrt69]

got a vacuum gauge and hooked it up on the intake port behind the carb. engine builder says 9-12hg at idle. im getting 9 at 1100 rpm. it drops to 5hg at 500rpm before it stalls.
i sprayed carb cleaner in/around the carb. decreased rpm.
i sprayed around the intake and might have gotten a slight rpm increase at the corner of the intake closest to the passenger seat. i used rubber gaskets for the intake sides, cork at front/back, and silicone inthe corners.

I guess i need to pull the intake off and check?

[nrt69]

just tried it again and got an increase in rpm when spraying into the carb.

[nrt69]

F&$King sh!t this is driving me crazy.

i got it to idle but theres obviously bigger problems.
my idle is 900-1100rpm when the engine is hot, and drops to 500-600rpm in gear. timing is @20degrees BTDC at idle. vacuum is 6-8hg.
engine guy says 14BTDC at 800rpm idle with 9-12hg vacuum. trans guy says it shouldnt drop off that much.

I dont think it the carb and cant find an increase in rpm when spraying carb cleaner around the intake.

the motor will not run with the timing anywhere else.

any suggestions???

[Musicman]

Setting the idle screws to the starting position is just that, a starting position... Have you actually set the idle circuit up correctly? If not it will can cause all kinds of headaches later on and have you chasing your own tail around.

Ignition first, then the Idle Circuit, then your power valves and jetting...


If you want to try setting the Idle Circuit up correctly, here is the right way to do it....
If you don't have a tach just listen to the engine and play it by ear, but a vacuum gage should be used.

To begin, make sure the engine is up to full operating temperature and the choke is completely off. A cold engine requires more fuel than a fully warmed engine even if the choke is off. Remove the air cleaner and connect the tach to the engine, and the vacuum gauge so it reads manifold vacuum.

Before you fire up the engine, slowly turn each idle-mixture screw in until it gently bottoms out and count the number of turns it takes. Do this for each idle-mixture screw and then return them to their original positions. If all the idle-mixture screws are not adjusted the same, do that now. Remember to always adjust both screws the same amount. This will help balance the idle mixture and allow the engine to run as smoothly as possible. If the carburetor is new to the engine, start at 1½ to 2 turns out (counterclockwise) from full in.

Now start the engine and set the idle speed to around 850 - 900 rpm's or so with the curb idle-speed screw. If your engine has a big cam and must idle at a higher speed, that's OK. Note the reading on the vacuum gauge. Next, very slowly turn one idle-mixture screw in ½-turn and note the change on the vacuum gauge. If the vacuum reading increases say, from 14 inches to 14-½ inches, move around to the other side of the carburetor and slowly turn that mixture screw in ½-turn as well. If the engine stumbles or the vacuum drops when initially turning the mixture screw in, turn both screws out about a ½-turn and evaluate the results. On most carburetors, turning the mixture screw in (clockwise) leans the mixture, while counterclockwise (out) enriches the mixture.

The goal of adjusting the idle-mixture screws is to achieve the highest possible idle vacuum at a set idle speed. If the idle speed increases after you adjust the idle-mixture screws (which is likely), be sure to adjust the curb idle speed screw back to the base speed again before moving forward. This is important because a higher idle speed will increase the vacuum reading. Maintaining a standard idle speed will make it easier to evaluate changes to the idle-mixture screws.

[nrt69]

am i setting the curb idle speed screw to 900rpm with as many turns as necessary? the idle screw is already turned in quite bit.
and am i doing this with the timing at 20BTDC as it is or 14BTDC as recommended? cause at 14BTDC it wont run.

[b5blue]

  This is where distributor set up is critical. Ignition is set first and must be right, are you running vacuum advance? Is it adjusted correctly if so? Mechanical advance settings, what are they? Type and condition of  plugs (even gap.), wires, coil and so on. You have to have all that optimized before getting much into the carb. adjustments.   

[y3chargerrt]

If your running vacuum advance disconnect it and recheck your timing.

[nrt69]

Someone tell me where im going wrong cause this problem is driving me crazy:

new 360 engine, 480/280/230 cam, eddy intake and rebuilt eddy carb set to specs.
new 904 trans with 2500 stall, full of fluid.
i set the #1 at TDC and dropped in the distributor gear so the rotor would be pointing at #1.
ive rechecked the wires/firing order 100X.
the distributor is a Mopar Perf electronic conversion with alot of miles on it.
spark plugs at gapped at 35.
Engine wouldnt run below 2000rpm.
i then played with the timing and carb and now its at @20BTDC at 800-1000rpm idle. engine builder says to put it at 14BTDC.
theres only 5-8hg of vacuum at this idle (engine builder says it should have 9-12hg).
all of the vacuum ports are capped or plugged.
ive sprayed carb cleaner around the carb and intake, no significant issues there.
the carb screws are turned in probably too far and its probably running off primary circuit but its idling.
turning the distributor in either direction will cause motor to shake and stall.
I can drive the car as is but theres significant pinging under load because of the timing.

I dont think the timing chain was installed incorrectly (see pic) and if the distributor gear was off slightly i should be able to correct it by rotating the distributor when adjusting the timing right?

[FLG]

Did you make sure that was tdc on the compression stroke? (Both valves closed)

[Rolling_Thunder]

is your choke hooked up ?   

[HPP]

Its hard to make out in your picture, but it looks like you have power brakes. Try disconnecting the power brake booster hose and plugging its attaching point on the intake. A vacuum leak in the booster diaphraghm can cause serious idle problems.

[Musicman]

is your choke hooked up ?   

Very Good Question 

[nrt69]

yes, i set it up on the compression stroke at TDC.
choke is not hooked up.
no power brakes...all vacuum sources are capped or plugged.

the only thing i havent tried is different intake gaskets and a new distributor. My neighbor is convinced its a vacuum leak. Can my 20BTDC setting at idle be due to a vacuum leak??
i dont think its the distributor since it worked fine on my old motor.

[b5blue]

Are you using vacuum advance on the dist.? Seems to me set the timing @ 12-14* THEN hook up vacuum advance and IT will put you back to + or - 20* at idle but drop out and let mechanical advance take over with higher RPM's. Get me? (The engine wants more timing @ idle but not @ off idle until higher RPM's.) Your getting a bigger drop in RPM's then is right when you put it in gear. You may be into the secondary's on your carb idle settings trying to compensate for timing settings or adjustments. The vacuum advance is adjustable to a degree by using an allen wrench inside the vacuum nipple on the dist. to increase or decrease the amount of action.   

[Musicman]

Depending on ambient temperatures, if you do not have a fully functional, properly adjusted choke, it will not idle at "low rpm" on startup... you will have to keep your foot in it to keep it running until it warms up. Once the block is up to temp, 900 rpm is fine...

[nrt69]

im not using vac advance. all vacuum locations are capped.
not using choke either.

I did just find this while researching the used performer intake on put on the motor:
http://www.edelbrock.com/automotive_new/misc/tech_center/install/2000/2176.pdf

edelbrock says I "MUST" "USE ONLY" their intake gaskets and put silicone at front/back. i didnt do that. I used the rubber gaskets on the sides and cork front/back.

At this point im willing to yank the intake and try their $23 gaskets to see if they work.