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Old 08-19-2010, 09:20 AM   #11
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We may be right back at square one - the priming process didn't work last night or this morning.

This is an elusive problem. I'll get around to testing the EGR solenoid and IACV theories this week (by disconnecting the solenoid rather than replacing, as suggested).
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Old 08-19-2010, 09:41 AM   #12
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My 4.0 idled ruff and I cleaned the MAF Runs smooth as a Linclon now.. From what I read just the smallest piece of trash can throw the MAF into fits on a Ford... I used CRC MAF cleaner...

I am assuming you don't have the CE light glowing...
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Old 08-19-2010, 10:22 AM   #13
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No check engine light at all. Every once in awhile the problem gets so bad that I'll throw an EGR flow excessive code, but that's because sometimes the idle never smooths out for some reason.

Last edited by Trotti; 08-19-2010 at 12:54 PM.
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Old 08-19-2010, 11:01 AM   #14
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An easy way to rule out excessive EGR flow (stuck open solenoid) is to simply remove the vacuum line from the EGR valve itself. Drive it like that even though it will eventually throw the CEL.

If that works, you need a new EGR solenoid valve.
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Old 08-21-2010, 11:24 AM   #15
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It looks as if it was the EGR Solenoid as Sasquatch said from the start . . . I took the vacuum line off of the valve and it cranked up fine. Put it back on, started the engine and it stumbled, stuttered and almost stalled. While still running, I removed the vacuum line from the EGR valve again and it smoothed out instantly. I replaced the EGR solenoid and, so far, it has started right up without issue.

I hope this is it - I could use a few thousand miles without any issues.
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Old 08-24-2010, 01:43 PM   #16
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A few days later and it's still starting without issue. I consider this one fixed.
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