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Cylinder 3 misfire code p0303 on 03 windstar

Already replaced intake gaskets. Exhaust smells like gasoline

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Posted on Jan 02, 2017

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SOURCE: 1996 Pont Grand Prix ---- P0303 again & again

wow have checked about everything .. the code is telling you that cylinder 3 is mis firing ... you agree that it is missing ... there has to be a problem with that cylinder .. i would check and recheck the ignition wire, plug, distributer cap, coil associated with that cylinder .. here is a couple of URLs that may or may not shed some light ..

Posted on Aug 17, 2009

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SOURCE: 2000 ford winstar sel update to problem

i had asimiliar misfire on my 2000 windstar.the first thing to check is a broken valve spring by taking off the valve cover the other is a o2 sensor bank 2 i believe is the downstream.if not the valve spring then either the coil pack or thecontrol module. either way it is fairly inexspensive

Posted on Mar 08, 2009

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SOURCE: Ford Windstar oil leak

Most possible oil leaks from valve cover rubber oil seal. Remove valve cover, inspect , clean surfaces, and replace with new rubber oil seal .
Good luck!
Thanks for using fixya.

Posted on Oct 19, 2008

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SOURCE: 2000 CIVIC System too lean Cylinder 3 and 4 misfire Deteced

  1. P0171: This means that the oxygen sensor has detected a lean air-fuel ratio. This can be caused due to a vaccuum leak or a problem in the HO2S circuit or the HO2S (Heated Oxygen Sensor) itself. (Bank one Sensor one). This is commonly located along the exhaust pipe. It could also be a bad Mass Air Flow sensor or a bad Engine Coolant Temperature sensor. Diagnostic checks will be needed to be carried out to be verified though
  2. Well as for the other codes, it means #3&4 cylinders are misfiring. It is a possibility that the P0171 code mite have caused the others to show up. I can be wrong though. But it is a strong possibility. If the air fuel mixtue is too lean indeed, mis-firing will occur, unless it is an actual electronic and not a mechnical problem. By the way, when these codes appear, how is the engine's performance. Does it remain the same or behaves poorly?

Posted on Feb 14, 2009

  • 38 Answers

SOURCE: error code p0303 cylinder 3

A P0303 code – The #3 cylinder is in question. The computer has noticed that one of the cylinders is firing improperly.

Symptoms may include:

  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
Poss. Causes:
A code P0303 may mean that one or more of the following has occurred:
  1. Faulty spark plug or wire
  2. Faulty coil (pack)
  3. Faulty oxygen sensor(s)
  4. Faulty fuel injector
  5. Burned exhaust valve
  6. Faulty catalytic converter(s)
  7. Running out of fuel
  8. Poor compression
  9. Defective computer
Poss. Solution(s):
If you are not having any of the above problems, then I would recommend resetting the code and see if it comes back.
If you experience / notice the engine is stumbling or hesitating, check the condition of the Spark Plug wires and boots. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. Another possibility could be faulty fuel injectors..

Good luck. I hope this helps.

Posted on Apr 07, 2009

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Cylinder misfire

tip misfires on 3-5-4-6 can be caused by intake gasket is bad never replace with factory gasket fellpro makes a steal and rubber cost more but it fixes the problem for ever

May 29, 2013 | 1998 GMC Yukon

2 Answers

I have several codes on my 1998 windstar they are P0303, p0171, P0402 and P0174. Is there one or two items I can change that may resolve some or all these codes?

The 303 is a misfire, and if there's no issue with the plugs or wires, I've replace a TON of ignition coils. If you remove the coil pack and see ANY type of crack in the mold on the bottom, replace it, it's done! The 171 and 174 are typically the intake plenum seals. The plenum gasket doesn't need to be replace, but the lower seals and bolt/seal kit (the bolts that hold it on to the intake manifold) require changing.

May 17, 2011 | 1998 Ford Windstar

2 Answers

Code p1537 comes up and misfire cyl.3 what can i do to repair the problem

DTC P1537 - Intake Manifold Runner Control IMRC maltfunction (Bank #1 stuck open)
Look down in the very back of the engine behind the intake manifold. You will see 2 linkages coming out of a box looking piece that has an electrical connection. Look at where the linkages hook up and see if the little white clips are broken or missing. This is typical. If all that looks ok, you may need the actual IMRC control--(Intake Manifold Runner Control); $150-200 range.

This it's located behind the upper intake manifold; actually bolted to the lower intake back by the firewall, it's not real easy to see. I would look at your vacuum lines on the intake manifold. I think it would be vacuum operated but I may be wrong. Anything on the manifold would be easy to fix and worth your time

DTC P0303 - Cylinder #3 Misfire
A code P0303 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
* If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps.

May 03, 2011 | 1998 Ford Windstar

1 Answer

My 98 ford windstar is displaying trouble codes p1537/p1538, along with a misfire on cylinder 1 & 2 (p0301/p0302). what are some problems that can cause this problem?

Codes p1537 and p 1538 are codes for a faulty IMRC valve. They are located on the lower intake manifold.

Intake Manifold Runner Control (IMRC), Vacuum Control
  1. Remove E-clip retaining vacuum control linkage to lever/shaft assembly.
  1. Remove adjustment screw from the vacuum control (9S514) and bracket.
  1. Remove two bolts retaining vacuum control and bracket to IMRC housing assembly.
  1. Disconnect linkage from the lever/shaft assembly and remove vacuum control .
  1. To install vacuum control and bracket assembly, reverse Removal procedure. Tighten retaining bolts to 8-11 Nm (71-97 lb-in). Adjust vacuum control as described.

    Intake Manifold Runner Control (IMRC)


As for the misfire codes, Check out the upper and lower intake gaskets. Since you have to take the upper intake off for the imrc valves its just a few more bolts to remove the lower intake. The intake gaskets are rubber seals. When the engine is cold the seals shrink and causes a misfire. when the engine warms up the seals expand and the misfire goes away.

Mar 07, 2011 | 1998 Ford Windstar

1 Answer

I have a 98 Ford Expedition, shut off on its own while driving down highway after check engine light started blinking, started back up right after. Got home, Coolant smells like gasoline. What could be the...

Perhaps a blown head gasket. It takes a fairly good misfire for Fords computer to actually flash a code. A blinking check engine light indicates a cylinder or multiple cylinder misfire. The fact that you smell gasoline in the coolant AND your check engine light is flashing leans toward a blown head gasket. I'll explain: When a head gasket blows between a cylinder and a coolant jacket (port coolant runs through to keep engine cool) that coolant can now enter into the cylinder chamber and the fuel and exhaust can also enter into the coolant system.Your coolant system can be pressurized up to 16psi under normal driving conditions so there is quite a force there and if there is a place for that coolant to go, it will find it. When coolant enters into the cylinder it creates a misfire. (water mixed with fuel and air does not make a very good ignition source) So then on the exhaust stroke, it can then expel this fuel/water mix back into the coolant system by way of that blown gasket, during an exhaust stroke the pressure is well beyond the 16lbs of your coolant system and can then force its way back in. This would explain a flashing light and the smell of fuel in the coolant. But for it to die while driving down the would have to be misfiring on more than just 1 cylinder or there is a separate issue on that one all together. With a head gasket blown between the coolant port and the cylinder, you may not see a visible leak from the outside. In this situation one would look at the coolant for signs of floating oil or carbon, pull the oil dipstick and look to see if it is a milky brown color, bubbles also indicates water and/or use a chemical test. You can't pick that up at walmart though. But this chemical test would be a blue chemical placed into a clear cylinder or tube with a suction ball at one end. You remove the radiator cap, start the vehicle then place this tube over the spot where the cap was. Must not let it make contact with the coolant though. Squeeze the ball several times, this draws in air and/or vapors. IF the blue chemical begins to turn yellow it has detected exhaust gases in your coolant system confirming a blown head gasket. Sorry so lengthy...hope it helps.

Jan 07, 2011 | 1998 Ford Expedition

1 Answer

Sir, My ford windstar 1998 give me the code P0174,sytem too lean(bank2), can you tell me what the problem is , it gives a heavy white smoke when i start the engine . just put a new cylinder head gasket...

It's an intake gasket. Another option, however rare is the air flow meter. But not likely. The white smoke is most likely antifreeze leaking into either a cylinder, or the intake and entering a cylinder, exiting as white smoke. The bad intake gasket (or intake manifold) could be causing both problems. I'd try a new set of gaskets and just the upper half of the intake manifold.

Jun 10, 2010 | 2001 Ford Windstar

1 Answer

1996 ford windstar 3.8 codes say that cylinders 4 and 6 are misfiring,system too lean bank 1,egr flow insufficient. whats up?

Cylinder misfiring hapens when ignition coil is bad and bad spark plugs.
System to lean is usualy when fuel pump lose pressure or you have blown gasket on intake manifold. Check fuel pressure first.
When EGR flow is insufficient there is EGR valve, sensor and solenoid, could go bad., so you have multiple codes P0171, P0304,P0306, P0401

Feb 21, 2010 | 1996 Ford Windstar

2 Answers

Engine coolant mixing with oil in reserve tank. blowing white smoke out exhaust

The intake is leaking,if it is a plastic one,replace the whole intake,if it is metal,replace the gasket.

Jan 24, 2010 | 1999 Ford Windstar

2 Answers

2002 ford windstar showing obd2 codes po303,po304,po305 and idiling ruff and wont run over 45 mph and has low miles, how do i fix it ,thanks sincerely mark

might be the coil pack is bad, wires, plugs, o2 sensors, dirty injectors, catalic converter ( only if you smell rotten eggs ) . cylinders are misfireing.

Mar 23, 2009 | 2002 Ford Windstar Cargo

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