5.4 rough idle no codes

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  • I have a 2005 Lariat. Just bought it about a month ago and have been doing maintenance on the weekends and working on a rough idle problem. Finally solved it. Things I did: 1) Replaced the spark plugs with Champion 7989. They don't break in the engine. 2) Gapped the plugs to .45 which is a little lower than recommended.
  • Feb 26, 2013 · I have been having a intermitant problem with my 2000 f250 5.4 for some time. Once drove it home 100 miles barely running and it didnt set a code and no check engine light. Only time it puts the famed check engine light on is when it is running OK, it goes out after a while but sets no codes.
  • Oct 08, 2012 · Rough Idle, hesitation on acceleration, loss of power I have a 94 4.0 XLT and let me just say I've tried what I could think of and luck just hasn't been on my side. When I start the engine its starts up right away with no issues.
  • Jan 31, 2010 · 2003 Expedition rough idle ... does the check engine light work - any codes? 1 ... Most common vacuum leaks on the 5.4 are caused by the 90% rubber elbows used on the ...
  • It is possible that the engine is running roughly because of a clogged fuel filter. Many times, that will not register a diagnostic code. The idle is not adjustable on a hemi. The computer controlls it by actuating the throttle valve. If your idle is too high or low you need to have sytem checked for codes.
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  • Fixing a rough idle requires a number of sequential check procedures, eliminating them one by one until the problem has been located. Step 1 Drive the vehicle to a reputable service center that has a code scanner.
  • Mar 19, 2016 · In the video check for the idle after the engine is revved. It appears normal for a few seconds and returns to a rough idle. You can see the truck rocking and the engine even more. I honestly don't know much about engines and such, so that's basically why I'm here. EDIT: So I took the truck out for a spin.
  • At idle Long Term Fuel trim on bank 1 is registered at -15.6% while Bank 2 is at 14.8% (Positive not minus) On my 3.0 SType i had a poor idle issue and it turned out to be failing coilpacks with no codes.
  • Apr 08, 2012 · Ford F-150 - 1997-2003 :: 2000 V8 Running Rough At Idle And Check Engine Light On. I started out with my 2000 F150 with a 5.4 V8 running rough at idle. It would idle way down slow and then rev up a little over and over. On a couple of occasions it would even die when in drive or reverse.
  • Just bought a used 99 Eddie Bauer Expedtion 4x4 with 5.4 L and 94000 miles. The truck is idleing a little rough, jerking while accellerating and check engine light comes on every other day. When it is running rough on accelleration and I give it more gas the Check engine light flashes.
  • Trouble code P0455 means: Evaporative Emission System Leak Detected (gross leak/no flow) ... Why the engine of F150 v8 5.4 is shaking or running rough under load. The cod on tester DOB is P0455?
  • Oct 09, 2012 · 2004 F150 4.6L STX four door, with 291,000 miles. Out of no where it starts sputtering, rough idle, no power and running very rich ... very. Checked codes indicated MAF, removed and cleaned (electric contact cleaner), cleaned throttle body and intake (throttle body cleaner) and replaced EGR valve. Restarted still just as rich and just as rough.
  • On fast idle, thats Ok. Few seconds, and good, I hear it ease on down to normal idle. Playing around a little (engine warm/hot by now) I discovered some seeming "new" problem. When I tap the gas, it runs up to fast idle (1,100 - 1,200 RPM) for about 8 seconds, then eases down to normal idle of 700-800. Dang, I don't remember it doing that.
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May 21, 2020 · Reasons for a Rough Idle or High RPM. If you are experiencing a rough idle or your RPM is running high when idling, then there are a variety of reasons for why this could be happening. It is not always easy to diagnose the cause because there are so many factors involved here. Below are the top causes that a mechanic would look for. 1) Bad ...
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  • Lean Code’s P0171 and P0174 – Common Causes June 14, 2009 10:47 am dennisb - Auto Tool Sales DIY, Ford Problems, How To Auto Repair, Lean Codes. Ford Expedition lean codes could caused by a leaky PCV hose. If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak.
  • Jul 27, 2014 · So why would a new air filter cause rough idle? C. cabri Diamond Member. Nov 3, 2012 3,617 1 81. Jul 27, 2014 #2 Put the old filter back in.
  • Then I started it after sitting for a couple days and the idle was pretty rough. Then i tried to drive and it runs pretty rough. Even after warm up. Checked for codes using the key flip and none are present.

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Q: 1. Two BCD numbers are stored in two memory locations NUMI and NUM2 in code memory (ROM). A list of numbers is stored starting at memory location LIST in code memory ...
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No other codes have ever been set, and none ever show up. It is definitely a random misfire at idle as it sounds like it has a cam in it, but uner heavy acceleration while backing the trailer, or holding the brake, it seems to be more of a steady misfire when it does it. Aug 29, 2015 · 2004 ford f150 5.4 3v idles rough but clears when rev engine up When driving my 2004 f 150 and come to a stop sometimes it starts to idle low and skips.when i rev engine it clears up to steady idle then it does it again after few miles .replaced cam,timing chains and rollers.The obd11 code is p 0404 but i dont see a egr valve so what could ...
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Feb 24, 2013 · Problem with 2000 F-350: SES, no codes, rough idle 7.3 Aftermarket
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May 21, 2020 · Reasons for a Rough Idle or High RPM. If you are experiencing a rough idle or your RPM is running high when idling, then there are a variety of reasons for why this could be happening. It is not always easy to diagnose the cause because there are so many factors involved here. Below are the top causes that a mechanic would look for. 1) Bad ...
  • Jan 27, 2009 · FordTough.ca - Home of Canadian Ford Truck Enthusiasts > Ford Tough Tech and Help Forum > Gas Engines > 2005 5.4 rough idle and ping 2005 Cobalt 2.2L Random misfire code, rough idle, won't get out of it's own way. 10 Answers. Fuel pressure good, clean fuel in tank, changed coil pack, plugs and boots. Any other common problems?
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  • 2005 Cobalt 2.2L Random misfire code, rough idle, won't get out of it's own way. 10 Answers. Fuel pressure good, clean fuel in tank, changed coil pack, plugs and boots. Any other common problems?
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  • Oct 22, 2020 · Connect a bidirectional scan tool to the same OBD port you would plug a code scanner into. Use the command in the scan tool to increase the engine’s idle. If the engine idle does not increase, it means there is an issue at the idle control motor of its circuit preventing the signal from changing the idle. 2005 Trucks, Crank/No Start, Hard Start, Runs Runs Rough at Idle: Pickups and vans built before 4-15-05 and Excursions built between 1-10 and 4-15-05 may exhibit hard or no start conditions with a low ICP signal, or a rough idle with a high ICP signal. This may be due to a damaged high pressure oil pump and/or IPR valve.
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  • Feb 17, 2012 · 2007 Ford F150 Rough idle and stalling I recently purchased a 2007 ford f150 king ranch. Sometimes when I have driven the truck for a while (20+ mins) and come to a stoplight the engine starts to have a rough idle.
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