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F Series Forum covers questions and discussions regarding Ford F-150, Ford F-250, Ford F-350, Ford F-450, Ford F-550, Ford F-650, and Ford F-750. |
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01-23-2020, 09:36 PM | #1 | |
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Join Date: Mar 2005
Location: Fort Mill, South Carolina
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2006 F-150 4.6L Rough Idle/Stumble
2006 F-150 4.6L 4WD - 112,000 miles
Issue: Idles rough once truck reaches normal operating temperature and then has some stumbling on acceleration. Truck was running fine when it was parked to rebuild rear end. Sat fo about 6-7 weeks with about 1/4 tank of gas. Parts installed (all were done within last 2 weeks except plugs): Plugs (last Summer - about 5,000 miles on them) COP’s Throttle position sensor Throttle body gasket (smoke test showed leak) Fuel pump delivery module Both upstream O2 sensors Air filter MAF inspected and cleaned with MAF cleaner I have use of a family member’s Matco Maximus 2.0 diagnostic tablet. These are the only off the wall readings I got: Absolute throttle position B, D and F are in the red, but regular absolute position is fine Short term fuel trim B1S2 and B2S2 are 99.2 and do not change at all No injector faults Power balance test is good All other sensors show within range I am leaning towards EGR and here is why: When I unplugged the dual vacuum line and tried to pull a vacuum on the 2 ports, this is what happened. Bottom port - pulled and held a steady vacuum. Top ports - I was unable to pull a vacuum. As I squeezed trigger to apply vacuum, needle would barely move and stay around zero. Any ideas? |
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07-05-2020, 11:12 AM | #2 | |
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Re: 2006 F-150 4.6L Rough Idle/Stumble
G'day, New around here as of today, and I saw your post, about your truck idling hard, and not good when you accelerate. On my 2006 F150 Lariat, I had a similar problem, and I had to replace the fuel module that is on the back axil it sits there, and the underneath of the module rots... and water gets inside it... and so on, she doesn't work no more. So if you go to Amazon, you can order one for about $65, get it, and it's a 20-minute install... After that, it should work much better!
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07-06-2020, 04:23 PM | #3 | ||
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Re: 2006 F-150 4.6L Rough Idle/Stumble
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08-02-2020, 10:44 AM | #4 | |
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Re: 2006 F-150 4.6L Rough Idle/Stumble
Sorry for the late reply. The fuel pump module did not work (that was one of the first things I tried). It did end up being the EGR valve. I bought a BWD brand from a local parts house and it was junk. I ended up ordering the Motorcraft one and it solved my issues.
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