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Misfiring

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  #11  
Old 01-23-2023, 04:09 PM
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OK, it's getting fire from coil to distributor and from distributor to the plugs. The fire is orange not blue. It starts but it only runs for about two seconds. That's a new one. Usually when it will start and run it runs perfect until it throws a fit and starts misfiring on all cylinders and then dies. And when that happens the fuel injectors will all be clicking untill I turn the switch off. I can't really drive it anywhere because I live in a busy town and if it stalls I would have to have it towed. It's a mess.​​​​​​
 
  #12  
Old 01-23-2023, 04:59 PM
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I forgot to tell you that it's showing codes now but it's only 12 and 55. Thanks!
 
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Old 01-25-2023, 11:28 AM
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Hello! Sorry to bother you but I was just wondering if you got my last message.
Thanks!
 
  #14  
Old 01-25-2023, 11:38 AM
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12 and 55 are pretty normal. Battery disconnected in last 50 key cycles, and end of codes.

Think it's time to check fuel pressure.
 
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Old 01-25-2023, 05:57 PM
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Ok, I will have to round up a gauge and do that. I'll get back to you when I find out what the pressure is. Thanks man
 
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Old 01-25-2023, 06:00 PM
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Ok, I will have to round up a gauge and do that. I'll get back to you when I find out what the pressure is. Thanks man

​​I have heard that the spark should be blue. I've heard that orange is weak. Is there anything to that?
 
  #17  
Old 01-25-2023, 07:19 PM
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Ideally, it should be a fat, blue spark that SNAPS! However, after going thru the coil wire, jumping from the rotor to the terminal on the distributor cap, and then off to the spark plug, yellow is about as good as it gets. One of the reasons coils started getting closer to the plugs.....
 
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Old 01-25-2023, 10:24 PM
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That makes sense.
 
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Old 01-29-2023, 03:38 PM
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I finally got around to testing the fuel pressure and it has 40 psi while the pump is running and when it shuts off it drops down to 30 psi. Can not having enough fuel pressure cause it to misfire and backfire through the pips? I appreciate your help.
 
  #20  
Old 01-29-2023, 03:42 PM
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I think 40 is correct. The falloff after the pump stops running is pretty much expected..... Something else is causing the misfires. Are you getting misfire codes yet?

Edit: Nevermind. OBDI won't set misfire codes......

Can you isolate which cylinders are misfiring?
 


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