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Suddenly my 340 doesn't want to idle hot?
#1471848
07/21/13 10:39 PM
07/21/13 10:39 PM
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Joined: Apr 2003
Posts: 915
near New Haven, CT
fireeng
OP
super stock
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OP
super stock
Joined: Apr 2003
Posts: 915
near New Haven, CT
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As disclosed in the past, I'm am no mechanic.
I have a rebuilt stock 71 340 with a Harms built thermoquad. I just got the car running mint and it has about 600 miles on it now. The last two times I drove it, it starts up and runs perfect until it get hot then it does not want to idle in drive. It will stall at red lights if I don't put the car in neutral. It starts right back up but I have to hurry up and rev it up and throw it into gear to get it to take off with out stalling. Tonight, I tried to raise up the idle a bit cause I thought it was a little low (about 700 in neutral). I was doing this after driving it home from a cruise (running for about 25 minutes).
I raised the neutral idle as far as I could with the idle screw (about 840) and after that the car wants to stall every time I put it in gear. The car was running another 10 minutes or so while I adjusted the idle so it was pretty warm at this point. It also now seemed to be loading up a bit like it was choking out. (even in neutral) This is the first time it has acted like this since I got it running good.
Any ideas on what could be going on? I will have to get my mechanic to look at it but I am trying to learn as I go so I always start here.
You guys rock. As always, thanks for any help..
Scott
2016 Diesel Ram 3500 Mason Dump
1971 Challenger
2013 Jeep Wrangler
1979 Dodge Ram Power Wagon 400 Mini Pumper
My other car is a Fire Truck.
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Re: Suddenly my 340 doesn't want to idle hot?
[Re: fireeng]
#1471849
07/21/13 10:49 PM
07/21/13 10:49 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Eng off. Take out the idle mixture screws (Turn them in first to lightly seated & count the # of turns so you can easily return them to their original position when done). fit one of those thin red straws to a can of starting fluid & shoot a 2 second blast into each hole in the carb base then replace the screws.
live every 24 hour block of time like it's your last day on earth
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Re: Suddenly my 340 doesn't want to idle hot?
[Re: fireeng]
#1471851
07/22/13 10:25 AM
07/22/13 10:25 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Sure bro. Dirt in the idle passages & the idle system has the smallest passages & are the easiest to plug up. Starting fluid cleans em. The only thing that makes me think that this might be something else as in heat related with the fuel is that it only happens when hot but blasting the 2 holes clean is easy to do & has happened to me several times on my eddy 1406, it would die at idle. Had to blast it several times in a month then I put on a new fuel filter & been good for months now. E10 (ethanol) corn gas will do it but I'm assuming you have not changed gas stations
live every 24 hour block of time like it's your last day on earth
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Re: Suddenly my 340 doesn't want to idle hot?
[Re: ScottSmith_Harms]
#1471853
07/22/13 11:43 AM
07/22/13 11:43 AM
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Joined: Jun 2005
Posts: 368
Jacksonville, Fl
426runner
enthusiast
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enthusiast
Joined: Jun 2005
Posts: 368
Jacksonville, Fl
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This is what I am dealing with right now. Car ends up sitting for sometimes an extended period. Slowly (or suddenly) car is hard to start and runs like crap. I take a look and carb insides are trash. I have them apart now awaiting new gaskets. I just asked/posted the question as to the best solution to clean with. Scott, these are a pair of your "repo-hemi carbs"... what would you suggest to soak in or clean with? I don't want to hurt the platings at the linkage. I hope I'm not causing a foul here by asking my post again in this thread but it seems related.
Later, Sandy
'70 HEMI Road Runner B5/B5, 4 spd
"Sandy's Garage" on Facebook
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Re: Suddenly my 340 doesn't want to idle hot?
[Re: fireeng]
#1471861
07/29/13 08:24 PM
07/29/13 08:24 PM
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Joined: Jan 2003
Posts: 75,004
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,004
U.S.S.A.
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Quote:
I just filled up with the same gas I have been running in it all along, so the next tank I will switch it up and see if there is a difference.
Electric fuel pump unless you like driving it like it is ...
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Re: Suddenly my 340 doesn't want to idle hot?
[Re: RapidRobert]
#1471862
07/29/13 09:26 PM
07/29/13 09:26 PM
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Joined: Apr 2003
Posts: 915
near New Haven, CT
fireeng
OP
super stock
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OP
super stock
Joined: Apr 2003
Posts: 915
near New Haven, CT
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13 ain't retarded unless the cam is pretty radical & this did happen all of a sudden I believe. Are we using ethanol (E10)?
Cam is pretty close to stock for a 71 build. This issue did just start this season (carb was changed over the winter). I think I am using E10, I believe that is all that is available around here.
I guess electric fuel pump is an option if I can't get any other way to work.
2016 Diesel Ram 3500 Mason Dump
1971 Challenger
2013 Jeep Wrangler
1979 Dodge Ram Power Wagon 400 Mini Pumper
My other car is a Fire Truck.
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Re: Suddenly my 340 doesn't want to idle hot?
[Re: fireeng]
#1471863
07/29/13 09:43 PM
07/29/13 09:43 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I may be off base here but I would think that the hot idling dieing problem is from the combo of E10/heat not a fuel delivery inadequacy that an elec pump would fix. EDIT could you plumb in a can of race gas or any available fuel that has no ethanol in it to the pump inlet & see if the problem goes away? But if an elec pump will pressurize the ethanol & solve this I stand corrected
live every 24 hour block of time like it's your last day on earth
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Re: Suddenly my 340 doesn't want to idle hot?
[Re: Dodge-N-Shelby]
#1471866
07/30/13 10:17 AM
07/30/13 10:17 AM
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Joined: Jan 2003
Posts: 75,004
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,004
U.S.S.A.
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Quote:
In the last 2 weeks I have been fighting a similar problem with the 383 in my 65 Newport. Runs great for 20-25 minutes until it warms up good and then dies when I pull up to a light, slow down to turn, etc. I replaced my 1405 Eddy with a NIB 1405 after fooling with the 1st one, I pulled the intake and blocked the heat ports since I don't need them (trying cool the bottom of carb). A friend suggested that I may have a problem with the electronic ignition swap that I did recently so I tried a new distributor. I ended up dropping my original points distributor in and it runs great. I am guessing that I have either a loose wire or bad box but now that its running good, I will mess with it during winter storage. Just saying that you are not alone and goofy things happen. btw, I am running E-10 with a stock fuel pump and my first thought was that it was vapor locking.
Interesting that this fixed itself with a distributor change. how old is that distributor ? IS it an OLD Chrysler unit or the new mallory unit ?
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Re: Suddenly my 340 doesn't want to idle hot?
[Re: JohnRR]
#1471867
07/30/13 04:48 PM
07/30/13 04:48 PM
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Joined: Apr 2003
Posts: 915
near New Haven, CT
fireeng
OP
super stock
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OP
super stock
Joined: Apr 2003
Posts: 915
near New Haven, CT
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Let me ask. If vapor lock was causing my idling problem wouldn't it also make the car hard starting when hot? When my car does stall after its been running awhile it has always started right back up.
2016 Diesel Ram 3500 Mason Dump
1971 Challenger
2013 Jeep Wrangler
1979 Dodge Ram Power Wagon 400 Mini Pumper
My other car is a Fire Truck.
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