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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06 Cobalt LT 2.2 misfire on #1 cyl. Local parts check code


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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


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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.

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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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1 Answer

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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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