Question about 2000 Ford Focus

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Only misfires when running on LPG, have fitted another twinpack coil, platinum plugs and checked and measured the leads. What should the plug gap be and what else should I check?

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  • Ford Master
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You have a problem with the gas supply ,sounds like the mixture and no dealer has the equipment to test it ,take it back to the lpg installers

Posted on Oct 03, 2009

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Posted on Jan 02, 2017

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How do i put new spark plugs in my 2007 Saturn ion 4.2l


Misfire-could be other things beside the plug (and usually is). Could be the coil, plug wire, an injector problem -clogged or shorted or injector wire problem. If all those things check out good, could be a compression problem on #2. See if compression on #2 matches the other cylinders.
When you buy plugs (buy platinum for longer life) they should be pre-gapped to fit your engine. I always use anti-seize compound in a tube on spark plug threads. Then they won't get stuck in the engine next time you need to take them out. Much easier to work with them.
Pull plug wires off by pulling on the boot, remove plug with a spark plug socket, thread in the new plug and tighten-just snug, do not over tighten. The specified torque is usually about 20 ft. lbs. or less- so again, just snug. Then push the wire back on till you hear or feel it snap into place. Always a good idea to check the gap, just to be sure.

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Can't figure out why my 95 pontiac trans sport SE has a miss in it. We think it's our torque converter. Can you give me any information about it?


It will have to be a spark problem,torque convertor don,t cause a miss in the motor ,check leads ,fit new plugs ,check gaps are 43 thou. Check coil or coil packs for cracks.

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2006 ford five hundred with P0301 code. Idling rough and has loss of power. New spark plugs (Autolite platinum), coils, EGR. What next? About 1500 miles from home, tools, and mechanic.


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Aug 02, 2015 | Ford Cars & Trucks

1 Answer

Spark Plug on a A4


Autoparts store will look it up for you. For longevity, OEM are platinum. If you don't mind changing them more often, copper plugs work very good. On tune 1.8T (or chipped), I recommend NGK BKRE7E (one step colder than stock) copper plugs, gapped to 0.028 or 0.030 (B5 A4 have weak coils and they 'fade' with age; if misfires are detected, time to change coils (temp fix: even smaller gap).

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Hello, I am having Maruthi Omni LPG, for the past 3 months I am facing vehicle jerking problem due to misfire. I changed the Ignition coil ,but now also the problem arises


Th engine must be prroperly tuned for the LPG if this was fitted externally . If this was factory fitted please get a proper fuel setting done on the gas , check the spark plugs , the intensity , and also the timing.

May 12, 2011 | 1998 Suzuki Esteem

1 Answer

I changed my spark plugs set the right gaps now it is misfiring


DID YOU REPLACE PUT BACK IN SAME PLATINUM SPARK PLUGS. IF NOT YOU WILL HAVE MISFIRE IF SPARK PLUGS NOT PLATINUM TYPE.THE REGULAR NON PLATINUM PLUGS WONT RUN IN THAT VECHICLE.

Dec 22, 2010 | 1999 Oldsmobile Cutlass

3 Answers

1999 ford escort I changed the plugs, but broke a plug cap. Bought a generic replacement spark plug wire that had to be modified to fit into the head. I cannot get the firing order correct. The car...


Remove the plugs from the head. Insert into the coil wires. Make sure they are properly earthed on the engine. Crank the motor and check for spark at each of the plugs.
Refer to the diagram. Cylinders are connected as shown on the diagram in blue. 1 goes to cylinder 1(sparkplug furthest from coil pack), 2 to 2, 3 to 3 and 4 to 4(closets to coil pack).
To test the coil pack use a digital volt meter. Measure resistance between coil towers for coil 1(marked 1 in red on diagram) Value should be between 12000 and 14500 ohm. Do the same for coil towers 2.
Measure resistance between I and C1. If the measurement is more than 5 ohm the coil is defective. Do the same for I to C2.
Measuring voltage at I(Ignition start/run) to ground should be 10V.
I is connected to the 15A engine fuse. The radio interference capacitor is connected between this line and earth at the coil. Disconnect it to see if it cures the problem.
C1 and C2 connect to the powertrain control module.
Bear in mind that aftermarket coil wires may cause problems with misfiring, so see if you cant find an OEM coil wire to replace the broken one before replacing anything else.

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Nov 15, 2010 | 1989 Ford Escort

1 Answer

SPARK PLUG GAP


These engines use platinum plugs-you don't gap these type of plugs because you will damage te platinum electrode and cause misfire problems. Make sure you use bosch platinum factory recommended plugs and if he vehicle has more than 75k i would recommend replacing your plug wires as well/

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