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My car doesn't want to run when its hot
#1481169
08/07/13 08:04 PM
08/07/13 08:04 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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This is an update from a previous thread. I have a stock rebuilt 340 with electronic ignition and a harms built Thermoquad. The car starts up and runs mint for about 35-40 minutes after that it does not want to idle. I had it out yesterday and at the thirty minute mark I was in a parking lot and the car was running mint. I was able to stop and go into reverse and start and stop several times with no issues. 5 minutes later on my way home the idle starting getting rough. I limped to my driveway and tried checking a few things. Choke was wide open at this point. I covered the choke with my hand and the car wanted to stall out. (no vacuum leak??). I tried adjusting the mixtures screws a little and it seemed as though they were already in the best spot. The temp gauge is showing a normal operating temp but after fiddling with those few things the car now does not want to idle at all. It will start right back up but seemed as though it was now loading up. When I give it gas it spudders and wants to bog out, some smoke is present in the exhaust and when it does stall, I can see a mist of gas pop up through carb. It did back fire at one point and blew of one of the vacuum caps on my brake booster. I let it cool and took out a few spark plugs, 4 of them looked a little golden brown and the others look good, just metallic with no carbon build up and no excess smell of gas. I let the car sit overnight and this morning it ran the same, perfect for the first 40 minutes, then rougher a rougher until it was just bogging out.
Let me also disclose that I am by no means even a backyard mechanic. I am trying to learn as I go and trying to try a few things before I can get the car to a real mechanic.
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: My car doesn't want to run when its hot
[Re: fireeng]
#1481170
08/07/13 08:40 PM
08/07/13 08:40 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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Could you pull up the original thread so we can see what's been done so far?
live every 24 hour block of time like it's your last day on earth
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Re: My car doesn't want to run when its hot
[Re: fireeng]
#1481172
08/07/13 08:51 PM
08/07/13 08:51 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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Thank you. I remembered some of it. Deals like this I wish I could be there in person
live every 24 hour block of time like it's your last day on earth
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Re: My car doesn't want to run when its hot
[Re: fireeng]
#1481176
08/08/13 01:31 PM
08/08/13 01:31 PM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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Scott, I'm just going to throw this out there, because I had a similar problems years ago when I changed out the gas cap on my Challenger, I but a non vented cap on it, unknowingly, and the car would start to run ragged after 20-30 minutes, let it sit and what I thought was cooling off, it would restart and run fine for another 20-30 minutes...well it turned out I was starving the pump for fuel because of a vacumm/suction lock in the tank, I getting some fuel but not enough...could this be your issue?, perhaps a cap, or flip cap added during your resto?, or perhaps a vent/emission line not open, deleted, plugged, plumbed wrong during the resto?...if this might be the case, try running the car with no gas cap to see if the condition prevails,...sometimes it's the simplest things, or things we do to ourselves  Mike
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Re: My car doesn't want to run when its hot
[Re: DAYCLONA]
#1481177
08/08/13 03:58 PM
08/08/13 03:58 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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Quote:
Scott,
I'm just going to throw this out there, because I had a similar problems years ago when I changed out the gas cap on my Challenger, I but a non vented cap on it, unknowingly, and the car would start to run ragged after 20-30 minutes, let it sit and what I thought was cooling off, it would restart and run fine for another 20-30 minutes...well it turned out I was starving the pump for fuel because of a vacumm/suction lock in the tank, I getting some fuel but not enough...could this be your issue?, perhaps a cap, or flip cap added during your resto?, or perhaps a vent/emission line not open, deleted, plugged, plumbed wrong during the resto?...if this might be the case, try running the car with no gas cap to see if the condition prevails,...sometimes it's the simplest things, or things we do to ourselves
Mike
Thanks Mike, I will try this first as there is no expense or waiting involved. I also ordered a new control box as I don't think it will hurt to have a spare on hand if that's not the problem.
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: My car doesn't want to run when its hot
[Re: fireeng]
#1481178
08/21/13 04:44 PM
08/21/13 04:44 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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I tried running the car with no gas cap. It still did the same thing. It ran fine for 35 minutes then wants to stall out.
I changed the control box to a chrome unit and I am hoping to run it for an hour tonight.
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: My car doesn't want to run when its hot
[Re: fireeng]
#1481184
08/22/13 09:14 AM
08/22/13 09:14 AM
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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:
Had the same problem. Ran fine for about 30 min, and would die. I had a rotted filter in the tank. It would plug up and starve fuel. Later the tank debris would fall off the filter and it would run fine another 30 min. Check your fuel tank! Good luck!
Brand new fuel tank in the restoration. Just 600 miles on the car. Thanks for the idea though.
Is the pickup and strainer new? I'd do what was suggested and hook up a tempory fuel pressure gauge and see if it's vapor locking.
Bragging...I drove my 340 in Vegas a couple weeks ago and it was 100+ degrees.
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Re: My car doesn't want to run when its hot
[Re: Challenger 1]
#1481185
08/23/13 03:26 PM
08/23/13 03:26 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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Got to run the car today with the chrome box. No change, car ran fine for 45 minutes then it will stall if it stays at idle for any extended period. My driveway is a bit of a hill and in order to back it in today after the 45 minutes I had to hold the gas and the brake in order to keep it from stalling out. Coil next I guess??? Not really sure how to put in the fuel line pressure gauge on my own.
Here is what the temp gauge said when it started acting 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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