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Warm starting problem |
Post Reply | Page 123 4> |
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Texas275
Supporter of TheAMCForum Joined: Dec/18/2013 Location: Forney, Tx Status: Offline Points: 469 |
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Posted: Jan/29/2015 at 10:08am |
Finally got my Javelin tagged and inspected. So its being driven more and on longer trips. It has developed a warm starting problem. When its stone cold it fires right up, but it once warmed up I have to pump the heck out of the gas pedal to get it to start. Once it starts you can smell the extra fuel in the exhaust.
It is an 83 360 with a Edelbrock performer intake and Edelbrock 1406 carb with electric choke, running off of an electric fuel pump. Any Ideas? |
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AMCT
AMC Apprentice Joined: Feb/15/2014 Location: Springboro Pa Status: Offline Points: 123 |
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Could be a bad coil. Fine when cold but develops a short when warmed up. Hope this helps.
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Dirt is for racing asphalt is for getting there.
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rocklandrambler
AMC Addicted Joined: Feb/09/2013 Location: Nanuet, NY Status: Offline Points: 3953 |
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IMHO if you have an electric fuel pump there is no reason to be whomping on the gas pedal. All you're doing is flooding the engine. Get your foot off the pedal and check out the ignition system.
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Past AMC's
1974 Hornet X (new) 1975 Gremlin X (new) 1964 Classic 660 Cross Country 1965 American 440-H |
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Texas275
Supporter of TheAMCForum Joined: Dec/18/2013 Location: Forney, Tx Status: Offline Points: 469 |
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I was figuring it was a fuel problem since it would start after pumping. To be honest I didn't consider the ignition system. It's running a new HEI and it has fired up every time I turned the key, but again I haven't had it on the road. It was only starting and running in the shop, or when I needed to move it.
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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After a complete warm up (over 20 minute drive)
let it sit for same time as when engine would not re-start. Remove air cleaner, actuate throttle manually at carburetor and verify fuel is squirting down the venturi by the accelerator pump. If no squirt fuel is leaking or boiling out of fuel bowl and that's why pumping the pedal seems to fix it. if it has fuel, check for spark at the spark plug, if it's not a very bright crisp crack blue in color you have ignition trouble. Armand |
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70 Javelin SST, second owner, purchased 1972
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ccowx
AMC Addicted Joined: Nov/03/2010 Location: Yukon Status: Offline Points: 3510 |
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All of the above are possibilities. Another one might be to look at what kind of heat crossovers and undercarb spacers you have. I have a similar hot start issue and I believe it is because I took out the carb spacer for clearance with an R4B and ram air. Throw in that I have not blocked off the heat crossover and I think it is overheating the carb.
Chris Edited by ccowx - Jan/29/2015 at 3:54pm |
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Bruce Clarkson
AMC Addicted Joined: Feb/09/2013 Location: New Bern, NC Status: Offline Points: 538 |
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In the past I confused myself thinking I had one of the above mentioned typical hot start problems and instead I needed a carb overhaul.
I like the previous answers better but I was pouring fuel down one barrel of four and actually flooding things when I thought I was generating a vapor lock. Go figure. Bruce Clarkson PS: The folks at Hobbs carb did a bang up job quickly overhauling the carb. |
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Bruce Clarkson
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Is it worse after a long highway run?
It sounds like an over heated intake heat stove/crossover.
I have had an over heated Torker on a 390 that would
boil the carb empty in a matter of a couple of minutes.
I block the crossovers these days. Unless you are a jeep driver
who runs these cars in wintah anyway? Edited by Boris Badanov - Jan/29/2015 at 8:07pm |
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Gremlin Dreams
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
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Push the throttle 1/2 way and hold it there while cranking until it starts. release as soon as it starts and feather it lightly until it clears itself out of fuel. It's pretty normal for them to boil the fuel in the carburetor after you shut the engine off, especially so with the winter blend gasoline.
Should fire within 2-5 seconds. I'd only be concerned if it took longer than that. |
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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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360MDJav
AMC Addicted Joined: Feb/18/2012 Location: Georgia Status: Offline Points: 640 |
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Same issue here...R4B, 1406 carb, no spacer because of the ram air. Fuel boils when shut off. |
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1970 Big Bad Orange Donohue
1971 ADPS Javelin 1973 Javelin/AMX 401 |
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