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Old 08-28-2018, 07:36 AM
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Hey guys, I have a 2013 5.0 and can't shake the shudder. A couple of days ago, I wiped the PCM, changed the spark plugs, cleaned the mass airflow sensor and air filter and cleaned the throttle body. BUT STILL HAVE A SHUDDER at idle. I can't figure it out.

I guess the last resort would be to upload a tune, but I don't have a tuner.......

Do y'all have any suggestions?

Thanks!
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Old 08-28-2018, 02:01 PM
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How was the gap on the plugs when you changed them? What did you gap the new ones at? Did you check fuse 27 by any chance?
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Old 08-28-2018, 09:33 PM
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blue5.0, I didn't gap the plugs. They're Iridium and I was told not to gap them. I'll check the gap on the factory plugs tomorrow. I'm guessing they're around 50. I didn't check fuse 27, but I will tomorrow.

Thanks for chiming in!
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Old 08-29-2018, 07:40 AM
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I checked fuse 27 and it's good. Not melted or blown....... I was actually hoping it was blown to give me a source for the problem. Any other ideas?
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Old 08-29-2018, 01:58 PM
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By shudder, do you mean rough idle?
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Old 08-29-2018, 05:16 PM
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Yes, it's a random, rough idle.
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Old 08-29-2018, 05:40 PM
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No misfire codes? I think I would run some concentrated injector cleaner through it next and clean the throttle body.
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Old 08-29-2018, 06:30 PM
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Good idea. I'm also going to check the purge valve.

Thanks for the tip!
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Old 08-29-2018, 10:06 PM
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Well, the purge valve is good...... I was hoping it was bad. That would make it easy to diagnose. I'll run some concentrated injector cleaner through tomorrow and see what happens.
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Old 11-05-2018, 03:22 PM
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Ever find the issue? Having a similar issue with my 2016 5.0.
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