Is it normal for your engine to shake?
Is it normal for your engine to shake?
It is quite normal for your car engine to vibrate at optimum levels during operation. The rotation of the crankshaft, transmission gears, and other vital components inside the car engine can cause slight vibrations.
Why does my car run rough after a spark plug change?
It’s possible that a plug boot isn’t seated properly. You said you double checked, but boots can be tricky at times, giving you the impression they’re fully seated when they aren’t. Make sure you distinctly hear the metalic “click” of the boot connector mating with the plug terminal.
What causes fuel to scatter after spark plug change?
If this doesn’t fix it, then the injectors are also known to get carbon “Caps” built up on the tips making the fuel scatter wrong. Lot’s of problems with those cx-7’s.
What should I replace the spark plugs on?
Motorcraft plugs should have been replaced with Motorcraft plugs. The more immediate thing to consider is a vacuum leak. You might have left a small vacuum hose disconnected somewhere or a gasket might not have been seated correctly somewhere.
What should the gap be on spark plugs?
You installed plugs that were gapped beyond the maximum recommendation. The first step would be to remove and gap the plugs, aiming for the low end of the recommended gap range. That way, the plugs will stay in spec longer as the gap increases with age. Make sure the new plugs are an exact cross-reference replacement for the original FoMoCo plugs.
If this doesn’t fix it, then the injectors are also known to get carbon “Caps” built up on the tips making the fuel scatter wrong. Lot’s of problems with those cx-7’s.
It’s possible that a plug boot isn’t seated properly. You said you double checked, but boots can be tricky at times, giving you the impression they’re fully seated when they aren’t. Make sure you distinctly hear the metalic “click” of the boot connector mating with the plug terminal.
What to do when your spark plug goes bad?
Get a scan tool and look at your fuel trims. If they’re showing high positive corrections, rev the engine up to around 1500-2000 RPM’s and look for the fuel trims to return closer to a zero percentage correction. If you can diagnose it as a vacuum leak and correct that leak, then you can try leaving your NGK’s in to see how they behave.
You installed plugs that were gapped beyond the maximum recommendation. The first step would be to remove and gap the plugs, aiming for the low end of the recommended gap range. That way, the plugs will stay in spec longer as the gap increases with age. Make sure the new plugs are an exact cross-reference replacement for the original FoMoCo plugs.
