Posted before about problems with this car. 30,000 original miles. Purchased with 18,000. Ran fine until Trans rebuild and suddenly runs rough, They could find nothing other than misfires. stumbles under load and vibrates on acceleration. When pedal pushed to floor takes off fine otherwise stumbles and shudders at cruising speeds. Gas Mileage down from 21 to 11 mpgs at last fill up. Been to Ford Dealer twice for diagnostics. Ford says replace all O2 sensors (done) suggested replacement of #1 Coil only. Firestone Says could be MAS or PCM. Replaced all spark plugs. Subsequent testing by other independent shop shows Cylinders 1,2,3 and 4 missing. NOT showing any codes. Should I replace ALL The coils and if so what ones are reasonable and good, not requiring a 2nd mortgage?
Check that vacuum lines have not come off manifold.
Forgot to note, Cleaned MAS and reset PCM still runs rough and stumbles. Does not show any codes though?
Check if there is sparrk yes k at the plugs on the cylinders you stated if no spa
if no spark at the plugs yes fit new coil.
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SOURCE: Ford Crown Vic p0300 random cylinder misfire
take a look at the EGR valve it could be either vacum controlled or electronic either way what seems to be the problem is that the valve is stuck in the open position until the engine warms up you can gently tap the egr valve with a small hammer or a screw driver and you can see that it runs smooth, now if the egr valve is vacum controlled replace the valve. if it is electronoc controlled replace the valve and the module for the egr valve.
SOURCE: have a 1999 ford escort
Look at the Crank position sensor. If it doesn't send the signal to fire those cylinders the coil packs won't fire.
SOURCE: diagnosed with ignition coil problem,
2006 3.9 has to be a T-Bird or LS
There are no spark plug wires
It has Coil-On-Plug individual coils
Plugs don't fail --they get changed at 60,000 miles
give or take,say every 3 years
The front (2) O2 Sensors get repalced at 100,000
miles. The ones closest to the engine
Clean MAF Sensor at least once a year
I have no idea how you inspect a pcm,if your
at home & have no scanner or PC Based Software
Egr Valves fail early on those & other fords
You could test,not look at,actually put an oscilloscope
on the TPS Sensor
Any oil on a spark plug requires a new valve cover gasket
If a coil was replaced based on a code alone,you may have
replaced a good one,not what needed to be replaced if any
SOURCE: Replaced plugs and coil pack on 2001 ford taurus now car will not start
You will need to figure out if you have spark to the plugs, and if not- if you have voltage to the coil to proceed.
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