Question about 2000 Ford Ranger SuperCab

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Rough running, erratic spark

2000 ford ranger 3.0 done alot of testing and so far have removed and test injectors, blocked off the EGR port to check for operation, replaced IAC motor, changed plugs and wires, replaced coil pack. still engine misses.....used a timing light to determine that there is and eratic spark to 4 of the six cylinders. checked the crank sensor next and every thing checks out OK. Still the engine is setting no codes! at a loss now!

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  • crjrcr Mar 04, 2009

    Compresion was equal across all cylinders. This seems to be a spark issue.

  • crjrcr Mar 05, 2009

    Yes, Replaced them and the wires also.

  • Anonymous Mar 24, 2014

    Battery and alternator all checked out fine. Changed coil pack and cam sensor. Still struggles to turn over and no spark. Load tested Battery and Alt. Both are perfect.

  • Anonymous Apr 01, 2014

    After replacing the IAC Valve the check engine light is on and after removing the key the engine continues running for about 2 full minutes, Need Help!

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Run a compression test on the cylinders.If reading is low on any drop a little engine oil into the pot. If compression rises you have compession ring problems. Remove all plugs before you try this and place leads away from engine.

Posted on Mar 04, 2009

  • ANDY PLUMB Mar 04, 2009

    Have you checked the spark plug gaps?

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Jan 31, 2016 | Cars & Trucks

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Running rough


that is misfire
cause by 3 things if egr main not stuck open
bad compression on any cylinder, (weak or dead)
bad spark , do that long forgotten tune up now.?
bad fueling, lots of tests. injectors leaking or clogged,or way too high fuel pressure? more tests.
want to test, or GUE$$

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1993 ford ranger overloading on fuel rough idiling


Exhaust Converter worn out or blocked?

Cylinder Misfires?
Vacuum Leaks?
Old Oxygen Sensors?
Dirty Leaking Injectors?
Egr Problem?
Pcv Issue?
Evap System Problem?

Start Component Testing to find a problem

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Started engine and was running rough Check engine lamp came on Used code reader and found code p0306 Remove plugs Compression test no.6 was 175 and the rest were 150 replaced spark plugs and retry Still...


You've done a great job of trouble shooting thus far. I would certainly suspect the injector after all of that. But, I didn't see anything about you replacing the spark plug itself. I would try that first as a crack in the insulator (even hairline) will cause mis-fires. If the spark plug doesn't fix the mis-fire, it cold be caused by a bad fuel injector, bad signal (like a loose harness or bad wire) to the fuel injector, or a leak or valve issue on that cylinder.

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I have a 1992 Ford Ranger that runs perfect sometimes then will lose power and stall occaisionally. I done a complete tune-up, replaced the fuel filter, cleaned the injectors with two types cleaner and...


You haven't tuned anything. Tune-ups went away in 1980 with the introduction of electronics.
Fuel filter -filters fuel
Injector cleaner-waste of money,on some fords, it will remove the coating on pintle and is not recommended
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Have a misfire on cylinder 3


Hello
Here is what to check let me know if you need help checking this out
most common misfire causes on the cars I've worked on have been:
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  2. Spark plug wires
  3. Ignition coil
  4. Fuel injector
  5. Wiring to fuel injector
  6. Timing Belt
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  8. Contaminated fuel or bad fuel pump
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