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Really bad idle surge

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  #1  
Old 03-05-2018, 07:30 PM
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Really bad idle surge
leaving work noticed truck running rough and no power, got home idle surging horrible.
no cel, ran contribution test all passed, ran buzz test all clear, basically as far as codes there is “no issue” . I’m usually pretty self sufficient when it comes to wrenching but I am having a hard time figuring this one.

 
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  #2  
Old 03-05-2018, 07:59 PM
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Do you have a fuel pressure gauge
 
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Old 03-05-2018, 08:15 PM
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No fuel pressure gauge, pump does run and refills filter housing, I could probably rig up a temporary gauge but not for a few days.
I could probably replace the pump sooner than that, if it proves not to be the pump I had been wanting to run dual pumps anyway.
 
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Old 03-05-2018, 08:49 PM
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I was thinking clogged screens in tank since no codes. Have you done hutch mod
 
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Old 03-05-2018, 09:16 PM
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I have not , it’s one of those things I thought about
but never had reason to before.
i suppose I do now. Too bad tanks over 3/4
 
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Old 03-06-2018, 06:43 AM
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try disconnecting the fuel line at the back of the fuel pump and blow a little air back into the tank. if it clears up temporarily you'll know it's problem
 
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Old 03-06-2018, 08:27 AM
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Or, disconnect line from back of pump and connect a 5ft piece of 5/16 line in its place that the other end in a 5gal diesel jug
 
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Old 03-06-2018, 08:47 AM
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It's like you guys are reading my mind, I was thinking about doing both of those things. Working on the truck is going to have to wait till Saturday , as much as i like driving the turtle it's not very high on my priorities .
Thanks for the input and i will update after the weekend with results.
 
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Old 03-06-2018, 02:38 PM
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I'm not so sure about that, Typically when people have a pump issue or a plugged filters the idle, is OK.
Idle is not very demanding on the fuel system. If it can bearly come up with enough fuel to run at idle, how did it make it home?
 
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  #10  
Old 03-06-2018, 03:57 PM
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Here is a thought from DieseltechRon.
May or may not be related.
Ed
 
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  #11  
Old 03-06-2018, 04:05 PM
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I had already unplugged icp to see if cleared up. As far as getting if home I drove very gingerly .
going to hook fuel pressure gauge to see, when I drained the bowl turned key on the pump filled bowl but not vey quickly.
honestly I'm really not sure what the issue is , but I have to start somewhere.
 
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  #12  
Old 03-06-2018, 05:48 PM
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Temporarily ran clear line from filler neck to pump, was encouraged at first after running for a while just irritated again.
 
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Old 03-06-2018, 08:19 PM
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Tried unplugging the fuel bowl heater?
 
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  #14  
Old 03-07-2018, 08:29 AM
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i have not, how would FBH affect this?
 
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Old 03-07-2018, 10:01 AM
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A clean ebp tube
disconnect ebpv
Check fuelbowl for debris

Throwing darts now lizard
 
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