Question about Ford F 450 Super Duty

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I have a 1990 ford 460 EFI cylinders 1,2,6 has no change or little in RPM when spark plug wires removed.The three spark plugs has black carbon on them. I replaced them with new ones with new wires.Co

I have a 1990 ford 460 EFI cylinders 1,2,6 has no change or little in RPM when spark plug wires removed.The three spark plugs has black carbon on them. I replaced them with new ones with new wires.Compression is 150 lbs.All spark plugs fires. The fuel injectors click when engine is ruing. Check engine goes off when engine is ruing. The engine is missing and rough idle.Can anyone help? Details

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  • Robert Dec 08, 2012

    There was no change in RPM

  • Robert Dec 08, 2012

    I did remove no 2 plug and put a test light on no 1 injector the light was bright and could smell gas on the plug.the first idle is smooth and then gets rough.

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Check that the egr valve is not stuck open remove it and cover the hole on the intake side and see if it goes away or with engine running remove the vac line from the valve and install a short length of hose and suck on the hose to draw a vac on the valve it only takes 3-5 inches of vac to open it the engine should stall or run even worse if it is not stuck and if it was stuck open you didnt change anything

Posted on Dec 07, 2012

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SOURCE: 1993 Ford Explorer idles rough when engine is warm

try changing distributor cap & coil

Posted on Jan 06, 2009

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SOURCE: 2001 Ford Windstar runs rough.

remove the coil pack and look at bottom of it if it shows any cracks coil is bad very common on these vans if you have a noid light check for injector pulse on #4 if you have pulse and good blue spark most likely the injector is bad you have to remove upper plenum to get injectors out let me know how you make out

Posted on Jun 04, 2009

CarMech97
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SOURCE: 2002 escape miss fire on cylinder one

power not reaching cylinder 1 ignition coil. check electrical connections and wiring for any damage. test for power and ground at cylinder 1.
hope this helps.

Posted on Oct 07, 2009

andy233
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SOURCE: 98 grand cherokee cyliner 1 misfire,, HELP ..

it has cap not coil pack , you try decarb might get lucky any ticking ? next is leak down on the cylinder and determine weather rings or valves how many miles wheat are the engine codes now check and the plug again , did it have misfire on the same cylinder before you worked on it adn after you worked on it. What is running compression. all these answers are to answered some you can do some will need more tools.

Posted on Jan 03, 2010

Testimonial: "whats decarb.. ??? and whats leak test on the cylinder ? please help ..."

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SOURCE: 1996 Honda Accord Rough Idle Even After tune up

Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps

Posted on Mar 05, 2010

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