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| Wont idle in gear https://slantsix.org/forum/viewtopic.php?t=28005 |
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| Author: | 75scamp [ Sat Mar 22, 2008 8:32 pm ] |
| Post subject: | Wont idle in gear |
Hello is have a 75 scamp my problem is when i put the car in gear it runs rough then dies and only does this when vehicle is at operating temp. Here is a list of what i have done already. Adjusted valves to spec Replaced cap rotor wires plugs and pcv all with quality napa parts Rebuilt the 1945 carb Replaced the alternator and voltage regulator (fixed my low voltage problem at idle) Replaced all vacuum lines and hooked vacuum advance straight to carb I also checked engine vacuum and it was jumping rapidly from about 10-15 Any ideas or thoughts are welcome. |
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| Author: | Aggressive Ted [ Sat Mar 22, 2008 8:54 pm ] |
| Post subject: | |
What is your timing set at? If it is a zero degrees per spec that year, try 5 degrees. Sometimes you can run up to 10 with out recurving the distributor but you may need to adjust the vacuum can to compensate by turning it out 3 or 4 turns. More initial should keep it running unless you have a massive vacuum leak in the carb. I finally had to retire my 1945 after several rebuilds because of this problem. Tell us more. |
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| Author: | 75scamp [ Sun Mar 23, 2008 10:27 am ] |
| Post subject: | |
Any other ideas on this problem? could it be the distributor or coil? |
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| Author: | 75scamp [ Mon Mar 24, 2008 6:09 pm ] |
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Ok so i did some more testing and found that i only have 1.9v at the coil while running in park. What should it be at? |
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| Author: | Sam Powell [ Mon Mar 24, 2008 7:25 pm ] |
| Post subject: | |
It should register 7-8 volts at idle at the coil. You have found the symptom. Now you need to figure out why the voltage is low. Track the voltage from the alternator, through the firewall, and back out and see where it drops off. The alt should put out 13.5 at idle. Ignition switch, connectors, amp meter, voltage regulator? Check your gound and see if it is good. The high side of the ballast resister should read no less than .5 to 1 volt below the alternator. Even one volt drop is a sign of insipient problems. Sam |
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| Author: | Aggressive Ted [ Mon Mar 24, 2008 9:01 pm ] |
| Post subject: | |
The resistor mounted on the fire wall could be bad too. Some are not potted and will deteriorate faster or break. Try to find a new one that is potted on the back so you don't see the coils that is about 1 ohm, 1.5 ohms max. Like Sam said you should have the same voltage at the input side of the resistor as the alternator output and about 7 to 8 volts on the other side of the resistor which is the output to the coil. So the output side and the coil should both read the same. If not you have some burned wires or bad connections. |
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| Author: | Bren67Cuda904 [ Mon Mar 24, 2008 9:28 pm ] |
| Post subject: | Re: Wont idle in gear |
Quote:
I also checked engine vacuum and it was jumping rapidly from about 10-15
What does your vacuum do if you increase the rpm from idle to 1500 or 2000rpm? It sound like you've got ignition problems but something more to consider. If the vacuum smooths out, this could be a indication of worn valve guides. If it doesn't smooth out, broken or weak valve spring(s), or sticking valve(s). Or the ignition low voltage your finding.
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| Author: | 75scamp [ Sun Mar 30, 2008 4:11 pm ] |
| Post subject: | Updated*** |
Well I fixed my problem with not idling in gear. It was the coil ,so i also installed a MSD 6AL and a msd coil man she runs smooth as ever accelerates well and runs smooth at stoplights. I can hardly believe its the same car. |
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| Author: | Aggressive Ted [ Sun Mar 30, 2008 4:18 pm ] |
| Post subject: | |
Most excellent to news! Congrats It's always nice to have a good flow of electrons! |
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