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I have a ford mondeo 2l ive put new plugs and ht leads on and cleaned the injeters and fuel lines out but my car still misfires

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  • Ford Master
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Change the coil pack they dont last forever

Posted on Sep 27, 2010

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Code po304 cylinder four misfire on 1999 ford explore sport fuel injected 4.0 litre 2wd


you have a bad spark plug wire on cylinder 4 or your ignition coil
(coil pack) is bad.

here is a good guide to testing coils and wires if you need it
How to Test the Coil Pack Ford 3 0L 3 8L 4 0L 4 2L

Jan 15, 2015 | Ford Cars & Trucks

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We have a 1999 Mitsubishi gallant , we have a miss fire when ever its raining out ? what could be causing this to happen


misfiring is from plugs , HT leads ,moisture in the circuits and injector problems including low fuel pressure. use HT lead bridges to stop leads touching each other, clean out the interior of the distributor cap. ensure that the HT leads are pushed fully home in the cap and on the plugs . clean the distributor outside so the that spark cannot track through the dirt/oil.

Dec 27, 2014 | 1999 Mitsubishi Galant

1 Answer

Hi i have just had a new alternator, ignition leads and fuel filter fitted to try and cure bad misfire and flat battery, my spark plugs are wrong for my car could this be the problem as it is worse than...


yes, the spark plugs could be the problem but not always and the reason for this because if you bought these spark plugs from Autozone or Advance Auto Parts stores that they would on there computer systems show the right specs of right spark plugs for the certain car of yours. You should first put into your gasoline injector cleaner to see if this would clean your fuel injectors so the right amounts of gas is injected into the piston chambers is why its misfiring properly with some of the fuel injectors. If your car battery is going dead that you can your car to Autozone so they can check the alternator and battery out for free for you so when you go there to make sure they do this.

Jun 08, 2011 | Ford Fairmont Cars & Trucks

2 Answers

Code 303 and 304 and check engine light plugs have not been changed 119.000 miles is it tune up time


P0303....Cylinder 3 Misfire Detected

P0304....Cylinder 4 Misfire Detected

sounds like a new set of HT leads and plugs wouldnt go amiss(fire wires) weird name that fire wires HT stands for high tension leads in proper english .

Mar 07, 2011 | Ford F-150 Cars & Trucks

2 Answers

The car is a 2001 ford mondeo estate 2.0 zetec ,it misfires then cuts out but does restart straight away and there are no faults shown on the dashboard ie clocks ,the ht leads and spark plugs have been...


check that your spark plugs are new and gaped to specs.
Check your coil for any signs of wear sometimes they can receive hairline fractures and cause misfire. And check your MAF sensor this can cause misfire this is the sensor inline after your air filter. Pull it out and clean it preferably with some light solvent or WD-40 will do.

Mar 09, 2010 | Ford Escort Cars & Trucks

1 Answer

My 1990 sierra has a miss in it when i accelarate. I replaced plugs and wires but not the fuel filter or fuel pump.I also smell fuel outside between the bed and cab on the drivers side


Check out the distributor cap and rotor arm, - and make sure the plugs ar gapped properly - should be 1mm on 1.6 1.8, and 0.75mm on the 2 liter.
Check the oil level urgently, if it has been misfiring for some time you will have acuumulated all that unburnt petrol in the oil sump!!! (you can test this by getting a bit of oil from the dipstick and putting a drop on your fingers, rub together and sniff the oil, if it stinks of petrol change it -you need to change the oil filter too since it wil be full of petrol tainted oil also.
Once you are sure you have good oil and either it was ok after testing it from the distick "golden, clean oil" or you replaced the contaminated oil and filter you can move on to sorting out this misfire.
- You didn't mention if you checked or replaced the HT coil - Check for strong sparking from the main HT lead from the coil itslelf, Pull the lead from the centre of the distibutor cap - have someone crank the engine while there is a "spare" sparkplug in the main ht lead (ground the plug to the engine, holding the rubber insulation of the cable with pliers - Use a normal HT lead if the main coil lead wont reach a suitable grounding point with the sparkplug) - check for solid bright blue spark, it should be regular timed, and strong EVERY time - any missing or weak sparks indicate electrical problem either - the coil is failing - or the battery is weak - or the distributor is faulty. - a faulty distributor would be expensive to replace and more so to repair, a reconditioned distributor costs around £120.
for now I assume the coil checked out fine and gave a strong steady uniform set of sparks. ----------------------- With a fully functioning coil, you're left with the distributor cap and rotor arm - the distributor cap comes off with 2 screws at the left and right sides of the cap between the HT Connectors - unscrew them - (note the original orientation of the distributor cap before you pull it off to aid refitting) you can now pull away the cap from the rest of the distributor.
INSIDE the CAP there are four "poles" round the outside, and a spring mounted contact in the center - make sure the poles are clean and shiny with only light markings at most, if they are blackened, whitened ro rounded and pitted then replace the cap - ford dealers or local part shop, most shops will stock both the rotor arm and distributor cap for around £15-30 - phone around for the best deal.
Still on the distributor is the rotor arm, this pulls off - it has to be pulled dead straight off the distributor shaft - once you have the rotor arm off you can inspect the metal contact on the top for general dirtiness and decay, it "should" be shiny brass/copper in colour. if it looks pretty bad, pitted or blackened/burned- - get a new rotor arm from ford dealers or from local part shop (not expensive)
Once you are sure of a clean or new rotor arm and distributor cap you can try the engine again - hopefully the misfire is gone.
If it is still there....
we are here

DISTRIBUTOR CAP - FINE ROTOR ARM - FINE OIL + FILTER NOT OVER LEVEL + CLEAN, NO PETROL IN IT HT COIL - GOOD STRONG REGULAR SPARK. -----

If it still misfires with all these things in perfect order then you are left with: Clogged Fuel Line/Filter or Failing Fuel Pump or Ignition TIMING - ( 10-12 degrees BTDC) have igition timing checked and set if not correct. OR... Faulty Distributor - pretty much worst case scenario. Tell me how you get on - Often it is the distributor cap and rotor arm - If not I hope its the fuel filter!
Good luck,

Jan 22, 2010 | 1990 GMC Sierra

1 Answer

Hi there i have a 1.8 16v duratec ford mondeo 2001 its developed a misfire under load if you accelarate hard it clears


check your spark plug leads,and plugs,hasnt got wet recently,as after steam cleaning this can happen or plug leads getting tired

Oct 25, 2009 | 2001 Ford Escort ZX2

2 Answers

Hi,i really hope someone can help?? ive got a 2001 ford mondeo 2.0i,......now ive got a misfire on 1 and 3.....now ive put a new coil pack on with new leads and spark plugs and its still the same....ive...


The problem could be in the injection control module. This can be checked by what they call a noid light that can be purchased at a parts house, plug it into the injector pigtail start the car and see if the noid light comes on when it is supposed to fire on that injector if does not then the control module is going bad.

Sep 17, 2009 | 2001 Ford Focus

1 Answer

1997 2L mondeo LPG conversion when idle revs go up then down sounds like it is going to cut out but switch to petrol idle ok


Is you're Check engine light on? It could be cause you're TPS needs To be checked. Spark plugs/ wires/ Coils, , Vacuum hose lines are losing air from a cracked hose or lose one.

Does the car Shake? Fuel Injector's. Fuel Pump, Fuel lines, Etc.......

Are you runing you're AIR? It could just be causeing the motor to work alittle bit harder and droping the Rpms and kicking back up,

Good Luck ..


Regards, Jamie

Sep 03, 2009 | 1997 Ford Escort

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