Question about 2003 Ford Windstar

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Terrible misfire while running or idling, have already changed plugs, wires, fuel injector, and cam sensor, scan says running lean/misfire

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  • Ford Master
  • 715 Answers

Have you checked for vacumm leaks ?

Posted on May 23, 2011

  • Ricky Gittins
    Ricky Gittins May 26, 2011

    You give someone a bad rating when they ask a question, your dumber than a rock, people are trying to help you fool.

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97 Grand am v6 up & down idle. Driving =steady acceleration. I've changed, O2 sensor, throttle positioning sensor. Scan is still saying Random misfires? Get warm won't start.


P0300 Random misfire - lean condition , vacuum leak , low fuel pressure , fuel filter plugged partially , mass air flow sensor .
If the misfire is random, check for the following conditions:
?€¢
System Grounds: Ensure all connections are clean and properly tightened.


?€¢
MAF: A Mass Air Flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition.


?€¢
Air Induction System: Air leaks into the induction system which bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or faulty crankcase ventilation valve, or for vacuum leaks at the throttle body, EGR valve, and intake manifold mounting surfaces.


?€¢
Fuel Pressure: Perform a fuel system pressure test. A faulty fuel pump, plugged filter, or faulty fuel system pressure regulator will contribute to a lean condition.


?€¢
Injector(s): Perform injector coil/balance test to locate faulty injector(s) contributing to a lean or flooding condition. In addition to the above test, check the condition of the injector O rings.


?€¢
EGR: Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

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You have to determine which cylinder is doing the misfire. It may not be an ignition problem but possible injector problem.

Jul 12, 2015 | 2007 Suzuki Forenza Sedan

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Will "bogg" down under depressed acceleration and lower RPM's. Wondering if you have any suggestions? See below for what I've done already.


Raw fuel from the tail pipe I would think maybe a bad TPS, fuel pressure regulator or injector. More than likely a bad regulator or throttle position sensor. Check your fuel pressure after the regulator at idle and wide open throttle. At an idle the pressure should be 20-30 psi lower than at wide open throttle. If your getting to much fuel pressure it can cause it to bog down and lose power due to extremely rich conditions.Will also have strong exhaust fumes.

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2.3l 2001 ford ranger rough idle and running rich and misfiring with p0301 code


You have to correct the cylinder misfires first

You may have vacuum leaks somewhere in the
intake or exhaust

You really need to look at data with a scan tool

You start with Mode $06 & cylinder misfire count ,if that
even works well on your motor

Then you look at fuel trim & add short & long together,
to get an idea if it is running rich,which would be a lean
condition from a vacuum leak or rich from leaking injectors

All the data is only good if you haven't cleared it or disconnected
the battery. If you did, then you have to drive until all I/M Monitors
run & then look at data

You look at O2 sensor data & even scope them

You made no mention of checking for codes
No mention of a cylinder leak down test for valve leaks
Exhaust Converter age or condition !
Fuel Pressure !

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Ford f150 2003 po171 always lean bank 1. replaced bank 1 o2 sensor smoked intake. replaced egr valve. still code po171 short term trim 0123 but long term trim is up bank 1 30 anb bank 2 is 27. idle is a...


Code Po171 indicates a lean condition on cylinder bank #1 of the engine. This is the drivers side of the engine. I would suggest replacing both front oxygen sensors as a pair to start. An oxygen sensor has a life span of about 5 years and yours are now 9 years old if they are original. When they get older they are slow to respond to changes in the oxygen content of the exhaust and can trigger a code Po171. If you continue to have the same code set after the replacement of both oxygen sensors then it is time to find out why your engine is running lean. Some of the most common causes are an ignition misfire and a vacuum leak. I have also seen Fords EGR flow sensor (known by Ford as Delta Pressure Feedback sensor) to cause problems like that as well. A good mechanic with a scan tool can usually spot a problem like that in a few minutes.

Mar 01, 2011 | Ford F-150 Cars & Trucks

1 Answer

Got a 2001 Chevy blazer 4.3L cranks but does not start. got 62 psi at the fuel rail, replaced plugs and wires, got good spark at coil, replacing car and rotor! if the cam sensor or crank senor are bad...


Crank sensor is primarily for the spark and the cam sensor is for fuel management, crank/cam correlation for misfire purposes I would also change the wires.

Jul 12, 2017 | 2001 Chevrolet Blazer

1 Answer

What could cause MISFIRE CYLINDER 8. I already


Do a cylinder leakage / leak down test to determine if the valves and seals are leaking.

Apr 02, 2010 | 1997 Dodge Dakota

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99 malibu always read inconsistant fuel levels but now engine light came on and stalled on the highway.Codes read lean fuel and misfire. Exhaust smells horrible she sputters when left idle and idles low...


check to make sure catylitic convertor is not plugged. if it is ok, then put a code scanner on to read codes, may have a bad 02 sensor. if you dont have a scanner, most auto parts places will scan vehicles for free.

Dec 31, 2009 | 1999 Chevrolet Malibu

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I have 03 chevy implala with 3.4. have check engine light condition with PO 302 code with scan check. Says #2 misfire condition. Tried a new plug wire and spark plug. Could it be coil pack. Thanks Steve G


What was the condition of the spark plug when replaced, was it indicating to a lean or a rich air fuel ratio. When is it misfiring?? during idle or while driving. The easy way to see if it's misfire during idle, disconnect the #2 wire from the plug and run the engine and see if there is any difference in the idle. If there is then the plug is firing and your getting the misfire during driving and that could be caused by a dirty fuel injector in cylinder #2 and may need it cleaned of replaced, but check the wire harness to the fuel injector it self be fore you go through all that. Good luck and keep me posted, be glad to help

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