Question about 2003 Lincoln Navigator

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2003 navigator and right around 60mph i get a wicked shake or **** in the car. i think it may be a mis fire on the cylinder but not sure

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Had the same problem, if it sputters/jerks around 50-60MPH with your foot slightly on the accelerator, replace all 8 COPs(Ignition coil over plug) and sparkplugs....It will get worst and end up ditching you!! NOTE: Make sure if you replace the sparkplugs, that the you or your mechanic works on the motor COLD and are very careful removing and replacing them. These 5.4L on 97-04 models are known for very little plug threading, therefore ejecting the plug out of the motor. This will result in major engine damage. Hopefully this helps

Posted on Jul 22, 2009

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Posted on Jan 02, 2017

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1 Answer

Engine cylinder numbering


problem is that what auto zone told you was not complete
misfiring is more from faulty injectors/ injector control/wiring than from plugs and HT leads
so if you have replace the leads one for one then the problem will be the injectors

Jul 21, 2017 | Cars & Trucks

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Management light has come on when reaching 60mph, machine tells me 1 & 4 is mis- firing so coil pack has been changed but fault has come back when reaching 60mph again.


That is because the codes you got were not used
correctly

Most likely parts were replaced based on a codes
name

It doesn't work that way

You have to know the vehicles systems,how they
work & how to test them

After you find the problems,all of them,you decide
from your test results if a part is needed

You can get cylinder misfire codes for a cylinder
& it is not that one but a really bad other coil or several
or nothing to do with coils

Mar 10, 2013 | Cars & Trucks

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I have a '03 Toyota Celica GT-S with a annoying mis-fire. Started small by replacing all spark plugs - nothing. Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked...


Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked compression which check out good and put the computer on. Computer read mis-fire on cylinder 1, and then multiple misfire (like it would jump around). We went ahead and replaced the fuel injector on cylnder 1 - did not solve problem as when we hook the computer up, misfire seemed tp stay at idle and seem better when running high RMP, but check engine light is on as it never went away. Went ahead and replaced the coil pack to cylinder 1 - nothing. what am i missing?

Feb 06, 2011 | 2003 Toyota Celica

1 Answer

Check Engine Light on Yr2001 Ford Escape V-6 2wd. Code says: Misfire on cylinder #5. Dealer said compression is low in cylinder #5. This Escape needs to pass smog. What can we do?


If the engine has a P0305 DTC (Data Trouble Code) for a "cylinder 5 mis-fire detected", then the first thing to do is to do a compression test to determine if the mis-fire is actually being caused by a mechanical problem, or an electronic problem.

If the engine really does have low compression on the #5 cylinder then that is caused by a mechanical mis-fire and nothing electronic will repair it, and the most common causes for a mechanical mis-fire would be a burnt or bent intake or exhaust valve, a warped cylinder head or damaged head gasket, or a damaged piston. You can call around and find a repair shop that will do a "compression leak down test" if you want to know exactly what is causing the compression leak without any dis-assembly to the engine.

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My 2002 Mazda MPV recently developed an engine shake when stop at intersection or driving 45mph or slower. My mechanic scanned and found OS2 code, vacuum leak, replaced the intake hose, reset engine...


You might try another mechanic if this one can't get it fixed. Shaking is usually caused by one or more cylinders mis-firing for whatever reason--usually faulty ignition or fuel injection. Has the engine had recent tune-up? Bad spark plugs/plug wiring are frequent villains. Not sure what an 'OS2' code is. Hope this helps!

May 21, 2010 | 2003 Mazda MPV

1 Answer

Reads codes of po300,po302,po303,po305


Hi these are mis-fire codes ,
P0300 is a general mis-fire detected code the others relate to specific cylinders,
P0302 is cylinder 2 misfire
P0303................3........
p0305..................5........
I would check your spark plugs first if Ok you need to make sure the coils are working ok for this you need an osciloscope to check output voltage if your not sure then take to a qualified mechanic with Cadilac experience it could be caused by an air leak,bad ECT sensor or even Mass air flow sensor ,codes only tell you the result not the cause

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1 Answer

Engine warning light and engine vibration 2002 VW Passat


The flashing is telling you that the engine is mis-firing, the dealer will run a test to determine the cylinder that is mis-firing, chances are it is something simple

Dec 01, 2008 | 2002 Volkswagen Passat

1 Answer

My motor shakes


1). mis fire on one or more cylinders
2). timing
3). fuel flow
4). air flow
lets go with these for now.

Oct 22, 2008 | 1992 Honda Accord

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