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Ford fiesta misfiring at 1 & 4 I have changed coil pack also spark plug & ht leads

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Ignition coil

Posted on Mar 30, 2011

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Posted on Jan 02, 2017

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Mercedes Benz c230 w202 is have misfire so how to fix It when I run the car after 50 to 100 meters or sometimes during the starting get to misfire and I was change the fuel pump but its still misfire, any...


This car has coil packs which connect to each spark plug.the spark plugs sit deep under the top cover and need a special plug spanner to remove as the access is narrow and deep.

first check the condition of each plug....replace which the correct type ....make sure they are the correct gap...do not over tighten just a quarter turn after they bite.....run car engine .....if it still misfires then you need to replace the ht leads ....swop them with a new set.....if still misfires then it's the coil packs which are the most expensive part of replacement.i sourced mine on eBay.hope this is of help.as this is electronic ignition the misfire is most likely due to 1. Dirty plugs with incorrect gaps....2.faulty ht leads.... 3. Faulty coil packs....4. Incorrect timing.

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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

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1 Answer

Initial start up the engine sounds like its running on 2 cylinders under powered intil the temp gauge reads normal ???? any body got the answer please


Cold starting misfires can often be caused by either tired high tension spark plug leads or ignition coil packs. If replacing leads, then replace with a full, new set. Coils can be changed individually, but it is often the case that if one has failed, then the others aren't far behind. Some cars have individual coil packs on each spark plug. Some cars have a single pack for all plugs and some have coil packs which may control two or more plugs.

To check for a misfire (ignition failure) follow these steps:

(Cold start) (Use a pair of insulated pliers)

1) Start the vehicle

2) When the vehicle starts misfiring, disconnect plug leads or coil pack connections one at a time. If the vehicle idles even more roughly, then that plug or pack should be considered fine.
Replug each connection before disconnecting the next one. Once you disconnect a plug lead or coil pack connection and find no difference in poor engine running, then you have likely found the offending cylinder. Check the spark plug condition, lead and/or coil condition and connections on that cylinder.

3) Replace components as necessary.

Oct 12, 2014 | Cars & Trucks

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2004 ford focus no spark changed ht leads coil pack and crank sensor but still no spark


could be on the LOW tension side of the ign pack check any wiring leading to ign pack

Mar 26, 2014 | 2001 Ford Taurus

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I have misfire on number 3 cyl that is intermittant and a total nonfire on 4


SOUNDS LIKE THE COIL PACK OR THE WIRING CONNECTIONS ON OR TO THE COIL PACK .aLSO CHECK THE HT LEADS ON EARLIER MODELS ,LATER MODELS HAVE A COIL PACK ON EACH SPARK PLUG .MODERN TECHNOLOGY

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Cylinder 1 misfire detected


it might be a ht lead high tention lead, try replacing them and see how that goes

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1999 town car whats the number 3 misfire


a misfire on cylinder number 3. could be a dodgy spark plug, HT lead or coil pack/ distributor hope this helps

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Ford fiesta 1.4 o2 reg .


Common thing, water drips from the windscreen washer jets onto the Ht leads and into the spark plugs, New coil, leads spark plugs and new washer jets, Ford are aware of this fault and now sell modified washer jets.

Good luck Davelee.

Sep 11, 2008 | 2002 Ford Escort

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