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Re: Can't get 340 to idle down
[Re: Limabean70]
#1161525
01/20/12 06:37 PM
01/20/12 06:37 PM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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what do you mean by "won't idle" what cam is in it?
can you physically not get the RPM down, even if you turn the idle speed screw all the way in?
is there a vacuum leak somewhere?
I don't know of anything in the long block that will make RPM stay up.
it's got to be in the cam timing, spark timing, or carb setting I would think.
**Photobucket sucks**
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Re: Can't get 340 to idle down
[Re: RobX4406]
#1161532
01/20/12 06:55 PM
01/20/12 06:55 PM
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Joined: Jan 2012
Posts: 12
Forth Worth, TX
Limabean70
OP
member
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OP
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Forth Worth, TX
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Quote:
Carb/intake combo?
Some carbs have linkage interference issues on certain intake manifold creating a vacuum leak.
its an edlbrock torker and edlbrock carb. like i said this combo worked before so it has to be the longblock. i know you guys know more than me so if I have to take it back to the guy or try to get him to pay for some fixes i need to know what to say to him.
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Re: Can't get 340 to idle down
[Re: DAYCLONA]
#1161534
01/20/12 07:03 PM
01/20/12 07:03 PM
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Joined: Jan 2012
Posts: 12
Forth Worth, TX
Limabean70
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Posts: 12
Forth Worth, TX
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Quote:
I had this problem one time before,...turned out to be a piece of gasket mat'l from the carb baseplate that got stuck on the SECONDARY throttle blade holding it open ever so slightly, just a tinny, tiny, winnie little bit! that the idle would never go down no matter how far you backed the idle screw off or OUT!...take the carb off and check to make sure the shaft blades are sealing front and rear completely..... 
thanx, i cant right now cuz im on vacation in portland, or (rain sux) but I did have a friend helping me tune it who's a lot more experienced than I am and he said the carb was closing all the way. hes also the one that said it has to be the longblock cuz the intake and carb were working fine on my other motor.
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Re: Can't get 340 to idle down
[Re: 1_WILD_RT]
#1161536
01/20/12 07:13 PM
01/20/12 07:13 PM
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Joined: Jan 2012
Posts: 12
Forth Worth, TX
Limabean70
OP
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OP
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Joined: Jan 2012
Posts: 12
Forth Worth, TX
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Quote:
Quote:
Quote:
Carb/intake combo?
Some carbs have linkage interference issues on certain intake manifold creating a vacuum leak.
its an edlbrock torker and edlbrock carb. like i said this combo worked before so it has to be the longblock. i know you guys know more than me so if I have to take it back to the guy or try to get him to pay for some fixes i need to know what to say to him.
You bought a motor on C/L & you think your gonna get the seller to pay to fix it..  Never mind that it's not gonna be a problem with the long block.... Find someone with more experience than your friend...
why cant it be the longblock? my intake and carb were working fine before so it has to be the longblock right?
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Re: Can't get 340 to idle down
[Re: stumpy]
#1161540
01/20/12 07:19 PM
01/20/12 07:19 PM
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Joined: Jan 2012
Posts: 12
Forth Worth, TX
Limabean70
OP
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Forth Worth, TX
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Quote:
Because there is nothing in the long block assembly that can cause that problem. If it won't idle down it's a carb intake or linkage problem.
are you sure? im not disputing you but the score is tied right now 1 to 1 lol my buddy says it is the longblock and you say it isnt
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Re: Can't get 340 to idle down
[Re: stumpy]
#1161545
01/20/12 07:27 PM
01/20/12 07:27 PM
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Joined: Jan 2012
Posts: 12
Forth Worth, TX
Limabean70
OP
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Joined: Jan 2012
Posts: 12
Forth Worth, TX
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Quote:
I've been a mechanic for 45 years and have built engines for that long.There is nothing in a long block that can cause a high idle problem. BTW it's more like 8 moparts guys aginst your buddy.
lol sorry, I got lost in the count as I was reading things. i guess i'll take an 8:1 vote any day
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Re: Can't get 340 to idle down
[Re: Limabean70]
#1161548
01/20/12 07:40 PM
01/20/12 07:40 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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If you have a stick shift you can drive it but an auto dropping it in gear can be hard on parts....
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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Re: Can't get 340 to idle down
[Re: 1_WILD_RT]
#1161550
01/20/12 08:02 PM
01/20/12 08:02 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
Quote:
Carb/intake combo?
Some carbs have linkage interference issues on certain intake manifold creating a vacuum leak.
its an edlbrock torker and edlbrock carb. like i said this combo worked before so it has to be the longblock. i know you guys know more than me so if I have to take it back to the guy or try to get him to pay for some fixes i need to know what to say to him.
You bought a motor on C/L & you think your gonna get the seller to pay to fix it.. Never mind that it's not gonna be a problem with the long block.... Find someone with more experience than your friend...
This post is far as I read.
Yea as soon as I read where you blamed the "long block" I knew you needed a better helper.
How could the block and heads be at fault as long as the cam is in right? I'll bet you don't have enough intial timing, I'll bet that has been suggested already. Your in the right place to learn.
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Re: Can't get 340 to idle down
[Re: Limabean70]
#1161551
01/20/12 09:01 PM
01/20/12 09:01 PM
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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You have a huge vacuum leak somewhere. you sure the big plug is on the back or front of the carb?? Spray Brake clean around the carb base then around the intake when the RPM picks up you have found your vacuum leak. It could be under the intake if it is not sealing on the under side of the ports no good way to spray that like on a big block. Pull the intake bolts a little tighter to see if it changes. could well be the end rail gaskets are holding intake up from sealing right. did you put those centering plastic things on the end rail gaskets may be helping to hold intake up. BUT it is right there at the intake and carb area. If the carb is not being held open by a to tight throttle cable or other it's getting air somewhere else. Pull the throttle cable and kick down off carb for now to make sure they are not holding carb part way open! It's right there you will find it! Long block cannot feed it the air to run up!! another vote. It's carb held part open, intake to head seal, carb to intake seal or a big plug of intake or carb like where power brakes or PVC go.
Last edited by Dodgem; 01/20/12 09:06 PM.
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Re: Can't get 340 to idle down
[Re: Dodgem]
#1161553
01/20/12 09:12 PM
01/20/12 09:12 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
master
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Joined: Jun 2006
Posts: 5,161
CT
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Another one on the its not the long block side here! Intake manifold is probably leaking. Either its not torqued correctly, gaskets are no good, goobered up too much rtv around a port or something, it wont line up correctly, etc.
You did use new gaskets, right?
Did you take the carb off of the manifold or did you swing the entire thing as a unit? Check to make sure that you did not disturb the choke.
PCV port plugged in or blocked? That's an easy one to miss because its in the back. Maybe old dry rotted vacuum caps that you disturbed when you swing the manifold and carb?
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: Can't get 340 to idle down
[Re: RobX4406]
#1161555
01/21/12 11:25 PM
01/21/12 11:25 PM
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Joined: Jan 2010
Posts: 329
Orange Park, FL
MRHWS
enthusiast
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enthusiast
Joined: Jan 2010
Posts: 329
Orange Park, FL
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Quote:
When the intake was installed, did you note the spacing of intake to head?
Place intake on engine, no gaskets and slide it to one side, measure distance using feelers from manifold face to head face. If it more than about .060-.080 you may need thicker intake gaskets. No matter how much you tighten the intake, up to cracking it, it will not seal.
Do the simple stuff first to rule that out. Vacuum leak under/around carb, linkage hanging up would be my first check.
Set timing to about 15* BTDC and leave it. Recheck it if you get the idle down because you're probably already into the mechanical curve at 1500 rpm. My guess it's gonna want about 20* BTDC to run well at idle.
That's my guess. Something's bass ackward.
Last edited by MRHWS; 01/21/12 11:26 PM.
1973 Charger SE
1974 Charger Rallye 440 Aztec
2008 Charger SRT8
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Re: Can't get 340 to idle down
[Re: Limabean70]
#1161556
01/22/12 02:29 AM
01/22/12 02:29 AM
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Joined: Jan 2003
Posts: 1,996
s. e. pa.
calrobb2000
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,996
s. e. pa.
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hi 2 things come to mind here , you should have removed the roll pins front and rear of block deck so they do not hold manifold up and not let it seal to heads . if you did manifold should still hae clearance under front and rear of deck when installed with gaskets or a no seal condition will happen in port area . this would be due to head milling . look in distributor for too light of springs or maby one broken , not bringing timing down at idle causing a hi idle condition !
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Re: Can't get 340 to idle down
[Re: calrobb2000]
#1161557
01/22/12 03:13 AM
01/22/12 03:13 AM
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Joined: Jan 2005
Posts: 3,344
Central TX
roe
master
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master
Joined: Jan 2005
Posts: 3,344
Central TX
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I had something similar when I first dropped in my 360, I had the freaking throttle cable set too tight. Check the small stuff like that, and the vacuum caps, vacuum hoses. Do you have power brakes? I had the plastic cap that goes into the booster crack before, that'll give you a nice vacuum leak. How well is your intake sealing? Did you do the spray test yet around the intake sealing area yet?
roe
1971 Plymouth Satellite
408/904 8 3/4 3.23 SG
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Re: Can't get 340 to idle down
[Re: jeff57]
#1161559
01/23/12 02:34 PM
01/23/12 02:34 PM
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Joined: Jan 2008
Posts: 3,886
Lost and Spaced
bboogieart
master
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master
Joined: Jan 2008
Posts: 3,886
Lost and Spaced
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I notice we are not hearing back from the O.P. anymore.
Hmmm.
Not the long block, means he did something wrong. Didn't want to hear that. Maybe his freind didn't want to tell him, either. We all make mistakes. I hope he comes back, and I hope he gets it fixed. As said, this is a great place to learn. I myself have had the same problem, and it was a poor seal between intake and heads.
I have mechanical Aptitude.
I can screw up anything.
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Re: Can't get 340 to idle down
[Re: 1_WILD_RT]
#1161561
01/23/12 04:44 PM
01/23/12 04:44 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
super stock
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super stock
Joined: Jul 2011
Posts: 817
Eugene, Oregon
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Murphy valve in the coolant heater crossover banjo port was sticking and sucking air past the gnome ignitors, I'll bet you money.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: Can't get 340 to idle down
[Re: Secret Chimp]
#1161562
01/23/12 04:49 PM
01/23/12 04:49 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Murphy valve in the coolant heater crossover banjo port was sticking and sucking air past the gnome ignitors, I'll bet you money.
That's it!! Why didn't I think of that???
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Re: Can't get 340 to idle down
[Re: Dodgem]
#1161564
01/23/12 07:34 PM
01/23/12 07:34 PM
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Joined: Jan 2012
Posts: 12
Forth Worth, TX
Limabean70
OP
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OP
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Posts: 12
Forth Worth, TX
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Quote:
He said he was away on holidays?
thats right, i cant work on it till i get home. just wanted to thank you guys for all your help though.
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Re: Can't get 340 to idle down
[Re: Secret Chimp]
#1161565
01/24/12 01:33 AM
01/24/12 01:33 AM
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Joined: Jan 2003
Posts: 9,110
Tucson, AZ
Ramrod39
My New Title
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My New Title
Joined: Jan 2003
Posts: 9,110
Tucson, AZ
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Quote:
Murphy valve in the coolant heater crossover banjo port was sticking and sucking air past the gnome ignitors, I'll bet you money.
Only if he wasn't running the anti-rupture gnome ignitor tips and who does that anymore?
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Re: Can't get 340 to idle down
[Re: Limabean70]
#1161566
01/24/12 10:16 AM
01/24/12 10:16 AM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Quote:
Quote:
He said he was away on holidays?
thats right, i cant work on it till i get home. just wanted to thank you guys for all your help though.
That's what were here for. remember, the only dumb question is the one you DON'T ask that causes you to destroy your engine or car!
such as this one! had you not asked the question here, and just followed your buddy's advice, you would have pulled the engine out and torn it all down for no reason! but since you asked, you now know that it's all in the "top end" i.e. vacuum leak, timing issue, etc.
**Photobucket sucks**
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Re: Can't get 340 to idle down
[Re: Moparnut426]
#1161568
01/24/12 12:25 PM
01/24/12 12:25 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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I have had a stuck pcv valve do this,and have had a brake booster check valve/gromet do this. I have also had the small 318 port size tin gaskets leake with a 360 port size intake,from under the intake,burning oil/smoke showed up right away. had a carb not torqued down give fits for a couple days,went to R&R it and found the nuts loose  I wager vac leak but I have also had to reset carb settings/adjustments when swaping from engine to engine. get a vac gauge and timeing light on it and check for leaks
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