Re: Car won't start when hot
[Re: Exit1965]
#2798050
07/17/20 08:02 PM
07/17/20 08:02 PM
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Joined: Sep 2007
Posts: 1,053 Ont, Canada
gygeneral
OP
super stock
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OP
super stock
Joined: Sep 2007
Posts: 1,053
Ont, Canada
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Had a chance today to work on this, same as before cold start no problem, after a cruise shut it down and it started ok after 5 and 10 min, but after an hour no start. I did the jumper from the + battery to + on the coil and it didn't help. After two hours it started no problem. Noticed again when it didn't start the fuel was like a vapour (lighter than air) at the carb when I manually pumped it.
All the prior electrical test were done with the same results, nothing obviously wrong.
Question, battery is 7 yrs old, tested ok like I said , but could it be affected by heat, I can test the voltage but the CCA i can't. How about the starter, could heat affect its cranking power? Also looked at the Petronix inginitor in the distributor, gap was .018 between the hall cell and the distributor. There is no mention of gap in the installation instructions, and they also say its unaffected by heat.
Any other suggestions?
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Re: Car won't start when hot
[Re: gygeneral]
#2798169
07/18/20 04:32 AM
07/18/20 04:32 AM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
master
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master
Joined: Feb 2003
Posts: 2,810
Sobieski Wi
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Noticed again when it didn't start the fuel was like a vapour (lighter than air) at the carb when I manually pumped it.
The car has been hard to start all the time, but it started.
Trying to figure that statement out because it’s like the third time you mentioned it - Vapor at the carb
Go back to my July 2 posts
Do you know how an accelerator pump circuit works ?
Last edited by bee1971; 07/18/20 04:37 AM.
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: Car won't start when hot
[Re: bee1971]
#2798193
07/18/20 08:44 AM
07/18/20 08:44 AM
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Joined: Feb 2009
Posts: 1,149 NW New Jersey
RSI700VIPER
super stock
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super stock
Joined: Feb 2009
Posts: 1,149
NW New Jersey
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I am having this exact same problem with my stock '71 340. Starts easy after 10-15 minutes but after 1/2 hour, will not start. Next day, started ok when cold but same problem when hot. I thought it was initially it was ignition. I swapped out the point distributor for electronic - no help. So either the fuel is vaporizing as the OP is suggesting or the opposite is happening, a slow leak of fuel past the seat causing a delayed flooding condition. To restart my car after 1/2 hour, I need to hold the pedal to the floor while cranking maximizing air into the carb. When it finally starts, it lopes to life like a flooded condition. I am convinced now, especially after reading this post that I am having a slow flooding condition causing the no start after 1/2 hour. Makes sense since the problem just started happening one day with no mods or changes.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: Car won't start when hot
[Re: gygeneral]
#2798221
07/18/20 10:20 AM
07/18/20 10:20 AM
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Joined: Jan 2003
Posts: 18,424 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
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I Live Here
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The voltage was 12.7 before cranking, didn't get it while cranking. The car has been hard to start all the time, but it started. It has gotten worst. I talked to an engine builder around here and he says he's seeing lots of crap in the carbs because of today's fuel. I'm taking the car to him next week for him to try and figure out what is going on. But I don't know if a dirty carb would be worst when its hot. Knowing what the battery voltage will tell you a lot as to the battery's voltage under load. A 7 year old battery is definitely a candidate for replacement. I also recommend a mini starter. I can not tell you how many hard starters that the mini has made a whole lot quicker to start. I can see fuel doing certain things to make it difficult however operator technique to each situation can usually overcome the situation. If starved a simple shot of fuel from a squirt bottle should make it fire. If flooded you definitely do not want to pump. I found out if the car was indeed flooding holding the pedal 1/3 of the way down would overcome the problem. Never let up or pump until it starts even if you quit cranking hold the pedal 1/3 open until you crank again.
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Re: Car won't start when hot
[Re: kevin69bman]
#2798523
07/19/20 09:01 AM
07/19/20 09:01 AM
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Joined: Sep 2007
Posts: 1,053 Ont, Canada
gygeneral
OP
super stock
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OP
super stock
Joined: Sep 2007
Posts: 1,053
Ont, Canada
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Interesting, well as far as the fuel I'm unsing Shell V power 91 octane, supposed to be ethonol free, I see your point on the common parts of the pump. I'm going the take it for a ride today again but this time after an hour I'm going to try my best to get it start instead of waiting another hour for it to cool down. I'll try it assuming its flooded idea, then I'll spray some easy start fluid, I'll have the volt meter attached also and record the readings.I've tought about the battery, I know it tested ok at the store under load, but I wonder if heat is affecting its performance, it is a Turbo Start Retro battery and seven yrs old, and I've read lots of people having issues with these, I guess I've been lucky so far for it to last that long.
Last edited by gygeneral; 07/19/20 09:05 AM.
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Re: Car won't start when hot
[Re: gygeneral]
#2798583
07/19/20 12:46 PM
07/19/20 12:46 PM
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Joined: Jan 2003
Posts: 18,424 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,424
UPPER MICHIGAN, MARQUETTE COUN...
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This morning I had some time, so took it out for a drive, came back and parked it. Like prior test after an hour I tried to start it, this time assuming its flooded so I depressed the pedal 1/2 way, no pumping and it started. Tried again, now 1.5 hours since the ride and it started again using the same procedure. I will try again later once the rain goes by and road are dry. So maybe I was making it worst in all my prior tests by pumping and adding fuel. Thanks all will post when I try agian You might be on to a better understanding as to what the car is doing and what you need to do to correct it. Through the years I can not tell you how many people I have observed trying to start a car and making it worse. You can be under the hood telling them to try starting and observe them pumping the gas. You tell them to quit pumping and they claim I am not. Must be a reflex that some people have. So back to your issue no doubt if you had a slightly flooded engine you could of been making it worse. Just develop a new technique to starting it and your wallet will get heavier. Again if this is your problem as I previously stated a mini starter will make an unbelievable difference.
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Re: Car won't start when hot
[Re: gygeneral]
#2798721
07/19/20 08:45 PM
07/19/20 08:45 PM
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Joined: Feb 2009
Posts: 1,149 NW New Jersey
RSI700VIPER
super stock
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super stock
Joined: Feb 2009
Posts: 1,149
NW New Jersey
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Sometimes the obvious isn't so obvious. My carb was professionally rebuilt 3 years ago and I put about 500 miles on car since. I believe my flooding condition was caused by the ethanol degrading the rubber bowl seal. I wish I had somewhere in NJ to buy ethanol free gas.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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