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  #16 (permalink)  
Old 05-17-2011, 04:05 PM
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Intake

Well I see what my problem partly could have been here.
I had the engine rebuilt back in Sept, when I installed it back in the car, I used the same setup as what was on the engine. The Edelbrock Performer 531-ZV and the Edelbrock 600 carb,but used regular parts store gaskets. I took off the 600 carb and put on the 2100 2brrl carb with the 4 to 2 spacer and this is when I started having problems.
Tomorrow when I put on the stock intake with the 2100 car then I will see how she runs.

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Old 05-17-2011, 04:12 PM
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intake

Sorry I should have said "Edelbrock Performer 351-4V".
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Old 05-18-2011, 06:59 PM
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Intake

Cobalt327, Well installed the 351c intake everything is running. Car started right up. The engine is idling high and I have did everything I know to get it to idle down. Can't find any vac leak, timing is right. When I turn in the fuel air screws there is no difference in idle I turned both screws out to 2 turns still high idle.
It idles in park at 1500 rpms and in drive at 1000 rpms. My understanding is it should idle in park at 1000 rpms and in drive 500 600 rpms.
It seems when I take off the distributor vac it idles down to 1000 rpms. Is there a problem with the distributor?
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Old 05-18-2011, 07:30 PM
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I think this has been mentioned but it sounds like the butterflys are open a little or you have a vacuum leak. The idle mix won't respond under either of those conditions.
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Old 05-18-2011, 07:56 PM
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Ok I will check again for a vac leak
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  #21 (permalink)  
Old 05-19-2011, 05:15 AM
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Quote:
Originally Posted by jdcron
Ok I will check again for a vac leak
If there are no vacuum leaks, if the curb idle screw is not contacting the linkage and the idle is still too high you need to look at the choke fast idle cam to see if the adjustment screw is touching the fast idle cam. You will need to study the operation of the choke, fast idle cam and the linkages to understand how they work together to hold the idle high. The fast idle cam should only be keeping the idle high when the choke is closed or partially closed- but if there's any binding, the cam can still be engaged to a fast idle even w/the choke completely open.

Something else- if you turn the idle mixture screws all the way in, does the engine slow or stall? It should. If it doesn't slow or stall that's a sign that there is air/fuel entering the engine from elsewhere. The first thought is the throttle blades are open too far, allowing the engine to get air/fuel from the transition circuit, not primarily from the idle circuit as it should.

Let us know what you find. If you stick w/it, we will too. There IS a resolution to this.
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Old 05-19-2011, 07:20 AM
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Thanks for sticking with me.
The choke fast idle cam screw is ok it too was not touching as I was trying to figure this out. AS I said, this is a rebuild I got from Advance auto. I did not have this problem with the carb I took off. I m thinking a bad rebuild so I am going to take it back and exchange it.
OK let me explain this too you and you tell me what I need to do please.

As I said, I put the stock 2 brrl intake on yesterday, and I was going to put on my old carb and as I was doing so today, I noticed that when it is on, and I open the throttle, the bottom butterflies do not open all the way. They hit the intake manifold. Know what do I need here. When I used this old carb it was on a spacer on top of the Eldebrook.
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Old 05-19-2011, 07:26 AM
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Oh yes forgot to say, Last night when I was running the engine, I did here a hissing coming out of the top of the carb. Maybe it is sucking air from inside????
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Old 05-19-2011, 07:50 AM
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There sure could be an internal vacuum leak. Hard to tell over the internet what kind of noise of vacuum you're hearing is connected to a problem or is normal, but generally speaking, there's "bad" sucking sounds that are different than what's normally heard, and if you are experienced enough to know what you're hearing is abnormal- well, there's a problem.

The carb can be installed w/a 1/4"-3/8" thick "insulator-type" gasket between the carb and intake. This will usually keep anything from interfering w/the opening of the throttle blades.

So, the fast idle screw isn't on the fast idle cam and the idle screw isn't touching the linkage, right?

If that's the case, is there a chance the throttle blades are hanging open because of interference w/the throttle plate of the carb, or are the blades closing as they should, as in tightly to the throttle plate bore w/the screw all the way away from the linkage? You will need to remove the carb to tell, most likely.
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Old 05-19-2011, 09:29 AM
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Well Cobalt, I know that before I changed to the new carb, I did not have the fast idle problem so there were no leaks until I switched to the rebuilt carb. So I have to think it is the carb.
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  #26 (permalink)  
Old 05-19-2011, 09:32 AM
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That would seem to make sense. Any chance you can return the "new" carb, at least for a credit or replacement? If I were you, I'd be thinking about bailing on the "new" carb and possibly diving in and rebuilding the old carb. What was the problem w/the old carb, anyway?
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Old 05-19-2011, 09:40 AM
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Yeah already took it back got my money back and will build old carb.
Stay tuned for end results. Will let you know.

Hey just thought of something esle maybe you can help me with.
When I put on the 2brrl I found that the kick down arm from the tranny does not line up with the throttle hole. It is like maybe 3/8 or a little more short.
Do you think someone did something to it? I got the car with the 4brrl and intake (Eldebrock) on it so not sure if it was changed or what. Is there an adjustment on the kick down?
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  #28 (permalink)  
Old 05-19-2011, 03:14 PM
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No idea what tranny you have. If you have a Mustang w/a C4- http://realperformancemustangs.com/g...transmissions/. Otherwise google it, or maybe we can help if you supply the info.
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Old 05-19-2011, 06:00 PM
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I m thinking someone bent it to fit the 4 brrl Eldebrock
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Old 05-26-2011, 05:03 AM
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Hey cobalt327, Well as I said took the rebuilt Carb back, picked up another rebuilt Motorcraft, put it on found I had a problem. It was sucking air from the base where it bolted to the spacer I had on the intake. Took off the spacer double gasket between the intake and carb. Made a few adjustments and timed the engine and wolla, the engine purrs like a kitten on cat nip.
Thanks so very much for your help I learned a lot about carbs by missing with this.
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