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Have no clue what's going on... |
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JavelinYES 
AMC Apprentice 
Joined: Jun/25/2009 Location: Never neverland Status: Offline Points: 150 |
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 Topic: Have no clue what's going on...Posted: Oct/10/2014 at 12:14pm |
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Here's a video of what's going on. It's surging and idling weird. Give it gas and go down to idle it wants to die.
What's been done recently... New remanufactured motorcraft 2bbl carb from autoline New lifters installed New intake gasket 2 new rocker arms Had someone mess with the gas tank a little New exhaust New fuel pump as of yesterday New vacuum advance as of yesterday We took the carb apart and cleaned it today, without taking jets and all that off. We replaced the power valve thinking it may be that...No dice. Could it be a bad leak on the new intake gasket? Compression test came out ok across the board.. Edited by JavelinYES - Oct/10/2014 at 12:17pm |
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Snotty
AMC Addicted 
Joined: Mar/28/2014 Location: Chico, CA Status: Offline Points: 1247 |
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Posted: Oct/10/2014 at 12:26pm |
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Your car sounds great! What exhaust are you using?
Concerning the problem, have you changed the PCV? A bad one will make a car idle low and die. |
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Son's car: '73 Gremlin X, 401, T-10, Mopar 8.75 rear with 3.23 sure grip. My car: '70 Newport Convertible, 440 automatic
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Greyhounds_AMX
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Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Posted: Oct/10/2014 at 12:33pm |
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Did it surge like that before you replaced the vacuum advance? I'd try disconnecting it to see if it's the issue.
I assume you set the idle mixture and all that (had to ask....)
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1968 AMX 390 w/T5
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JavelinYES
AMC Apprentice
Joined: Jun/25/2009 Location: Never neverland Status: Offline Points: 150 |
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Posted: Oct/10/2014 at 1:05pm |
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Snotty, thanks =) duals with X pipe and Flowmaster 40's with chevelle stainless tips. Local shop made it all and installed.
I haven't messed with the PVC yet to be honest. I'll have to check it out and see. Thanks Greyhounds, yes it was acting the exact same before hand. Also yeah we've adjusted them several times with no resolution. Thanks for the suggestions. |
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sasyamx
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Joined: Jul/24/2007 Location: Kentucky Status: Offline Points: 525 |
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Posted: Oct/10/2014 at 1:21pm |
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Check your air bleeds on top make sure nothing is in them , whats your timing at , check for a vacuum leak, have you put a vacuum gauge on it .
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FSJunkie
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Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
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Posted: Oct/10/2014 at 1:36pm |
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Remanufactured carburetors hardly ever run right.
Autoline is pretty good, though. I have an Autoline remanufactured YF on my 232, and they did a good job rebuilding it, but it's not the right carb. The problem is they take in carburetors from a range of several different years, say 1970-1974, and resell them as fitting any car in those years. In reality, there were 10 different specific calibrations of that carburetor in those years for different applications. Basically if you have a 1974 car, they can sell you a 1970 carburetor that is calibrated wrong for your engine. They usually run ok, but not perfect. ----------------------- Definitely behaves like a vacuum leak, but it would have to be a MASSIVE vacuum leak. Could also be the vacuum advance dithering in and out. If you have manifiold vacuum going to the vacuum advance and it isn't enough vacuum to fully advance the unit, it'll dither in and out and fluctuate the timing, causing an uneven idle. That's not a problem if you run ported vacuum advance, which these did from the factory. |
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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dbomb
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Joined: Jul/22/2012 Location: new jersey Status: Offline Points: 705 |
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Posted: Oct/10/2014 at 2:05pm |
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If it's got points check the dwell esprsciLly if you just changed cam make sure dist shaft not wobbling when motor turning Or dist shaft bushing worn out if hei could still be troubles TTY to richer it up artificially by resting a towel or shop rag over carb at idle. If smooths out something baking it lean. Of it's got egr it could be bad as we'll
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rebuiling 73 amx need parts
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Fluffy73
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Joined: Nov/21/2007 Location: Castlegar, BC Status: Offline Points: 3059 |
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Posted: Oct/10/2014 at 2:54pm |
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Pull off the rotor to make sure BOTH springs are on the mechanical advance. If one let go, it could be trying to advance at idle.
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I am genetically incapable of being Politically Correct.
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JavelinYES
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Joined: Jun/25/2009 Location: Never neverland Status: Offline Points: 150 |
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Posted: Oct/12/2014 at 3:21pm |
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Thanks for all the info, we've tried almost every suggestion and still a no go.
I have a question, does anyone have a known good carb lying around for a 304 72 javelin? Just so I can test and rule my carb out. Would be greatly appreciated. |
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Snotty
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Joined: Mar/28/2014 Location: Chico, CA Status: Offline Points: 1247 |
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Posted: Oct/12/2014 at 7:04pm |
Sounds great! |
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Son's car: '73 Gremlin X, 401, T-10, Mopar 8.75 rear with 3.23 sure grip. My car: '70 Newport Convertible, 440 automatic
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JavelinYES wrote: