K my 460 runs like **** its missing and number one plug was black...i changed wires- plugs -and cap and now runs worse and blowing white and blue smoke....whats wrong with it?

EGR valve ? Which pollutant is worse on gas analysis ?

oil change wont be the cause of the fault

missing could be
a plug , loose plug wire or coil pack
or the DFI below the coil pack


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Forum VE Holden Commodore 2006 2013

Hi there.
well when you throttle up to about 2000rpm do you get blue smoke coming out the exhaust.When driving on flat road will it power up as normal with out missing or getting hot.
what colour was the old spark plugs were they black or light brown.
When you start engine and run for 3 minutes then let it idle and remove oil filler cap do you get smoke coming out.
Number 1 if yes then engine is lacking power due to piston rings worn answer rebuild engine.
Number2 spark plugs brown [good] if black soot as num1.
Number 3 if you get black smoke or blue ,then the engine is lacking compression could be your problem as num1
OTHER WISE GET YOUR TIMING CHECKED AND SET TO BOOK.

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

Hello Donn,

UN-fortunately 1988 is WELL before the OBD
(on board diagnostic)... DIAGNOSTIC TROUBLE
Codes (DTC) got standardized...

So DAYS can be wasted looking for commonality...
(troubles).

Rather than assuming your spark, timing, fuel, ECU...
Oxygen Sensors. INJECTORS are all askew...

I would suggest that if you SATURATED YOUR
HEADER BOLTS with LIQUID WRENCH...

and opened you EXHAUST ahead of your catalytic
converters... ahead of your mufflers... you engine would run...

Obviously DANGEROUS to operate in that condition... at
least you would know what had to be REPLACED before
you can operate your vehicle SAFELY.

If you decide the job is a bit too much... at least
check out your PURCHASE cost of a replacement
CAT and/or MUFFLER...

Try rockauto
http://www.rockauto.com/en/catalog/ford,1988,f-350,7.5l+460cid+v8,1126437,exhaust+&+emission

1988 FORD 350 7 5L 460cid V8 Catalytic Converter RockAuto

1988 FORD 350 7 5L 460cid V8 Muffler RockAuto

Hi, from experience its more likely it is the spark plugs and/or wires.
Maybe even the distributor cracked. At night pop the hood start the car look around the wires and cap look for blue / white arking.

Generally speaking, bad spark plug cause missing...

Hi Gina.... Rough idle could be a number of things. The easiest and cheapest thing you could do is to replace the fuel filter. Usually they will run just a few bucks at the local auto store. If that doesn't do the trick, try to see if your car is smoking at all and try to determine if it is blue, black, or white smoke. Usually a blue smoke is oil, black is usually fuel richness, and white is coolant. White and blue are the most serious. If you are just burning extra fuel, you might need a tuneup consisting of new sparkplugs, maybe new sparkplug wires, new distributer cap, and distributor rotor. This might be a good time the change the oil and oil filter as well as check the other fluids such as transmission, coolant, and brake. Joe

Thanks for choosing Fixya!

The plug on the new harness is numbered.(look at the body of the white plug ) The Wires from old one are colored. they go together like this.
1 is blue and orange
2 is black and pink
3 is black (ground)
4 is Black and white
5 is Dark green

Bad plug wire or loose connection.

when you replaced the plugs/wires. Did you do the cap and rotor too
Also have your timing checked