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Missfireing started missfireing sudenly whilst driveing, replaced centre muffler, leads, plugs

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If you have put new spark plugs and spark plug wires in it you might have a vacuum air leak, let it warm up and sit idling in a quiet area and put it in park and set the parking brake, open the hood and listen for a hissing noise coming from the engine area, maybe have a helper idle up, not rev the engine to see if you can hear anything, If you find the leak go get some replacement vacuum hose from auto parts store. you may have also gotten a bad batch of gas, run it nearly to empty and go get some good ga$. If it keeps it up I dont recommend driving it like that, take it in and have them put it on the computer to see whats the matter.


Posted on Jul 15, 2008


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Engine is under max load in the situations you describe, so any weakness in spark or low fuel prssure can cause this, even a weak ignition module.

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My 2000 f150 throughts a code . missfire cyl 1&6 but ive replaced every thing i can think of. would a exagost leek cause it to missfire? or a cloged cat

misfires can come from faulty injectors, low fuel pressure in the manifold. timing , blocked exhaust. faulty o2 sensor, leaking inlet manifold gaskets, faulty valves (burnt) It is not always plugs and leads. Have a fault code reading done.

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Cant locate the spark plugs on vw golf 88 mk1..any ideas?

I'm assuming you have a petrol fuelled car, as diesels do not have spark plugs.

Find the distributor cap leading off the distributor - it should look a little like this:

there should be 5 leads trailing from the cap - the lead in the centre leads to the "coil", the other 4 leads go to the spark plugs. There should only be 4 as the Mk1 was only made as a 4 cylinder engine.

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Was running great then it just would not start and when it did it started idling fast now the exaust will glow red

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What does the code "misfire on bank 1 mean" on a diagnostic code for a 2000 lincoln navigator mean?

Do you mean "missfire on cylinder 1", code P0301? If so, that means that the computer has detected incomplete combustion in the #1 cylinder, which would be the front passenger side cylinder. There are many potential causes to a cylinder missfire ranging from worn / bad ignition components, clogged / bad fuel injector or even internal engine damage.

However the most common cause, especially on ford vehicles is a bad ignition coil. When trying to determine the cause of a missfire on an engine such as the one in your Navigator i start with removing the plug and checking for carbon tracing, excessive plug gap or contaminants on the plug. If that checks out ok i then swap the ignition coil from the missfiring cylinder to one that isn't. For example, I would swap the ignition coil from #1 to #2 and clear the codes. Then drive around until the light comes back. If it comes back with a missfire on cylinder #2 then you know the cause is the ignition coil and it has to be replaced. If it doesn't then it is something else causing the missfire which will require a bit more diagnostics.

How many miles are on your Navigator? Have the plugs ever been replaced? If you have close to 100k it would be a good idea to replace all of the plugs. Be careful when removing the plugs, it's not difficult to pull the threads right out of the head when removing the plug.

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2 Answers

Missfiring of engine


Cleaning plugs is not enough you will have to replace them. Ensure that they are the correct type of spark plug for the engine also, Don't try and skimp to save money because it will cost you alot more further down the track if the incorrect plugs are fitted. Get your High Tension Leads(Spark plug leads) checked as well,
Check that your air filter is clean also, if not replace this if it hasn't been done recently....last 10,000 km.

Another thing to have checked as well is the Oxygen sensor this maybe faulty.
And lastly have your cold start tempreture sensor checked this maybe faulty. Start with the plugs first then work your way through it. Hope this helps, let me know how you get on.


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Hi i have an audi a3 1.8t whilst driving the engine sudenly starts missing and spluttering if i change down a gear or take my foot off the throttle and then press it back down the problem usualy goes away...

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These cars have various faults with the engine management systems,when you have eliminated all the basics such as spark plugs,air leaks ,vacumn leaks you need to plug into the car and read the live data from the engine while it is running,a good place to start is the pencill coils and the Mass air flow meter as these are more common and relatively cheap,do not use cheap import parts use OE it pays in the end.

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