The Answer Is YES , It does Affecting your Mileage ,If the Spark plug(s) gap too wide or too narrow !!!
First of all, it the plug gap is too large the cyl. will not fire, or fire poorly. and, if there is no spark due to that, then the timing lite will not read anything.
You will have improper detonation. That means if the gap is too large it won't create a strong enough spark to burn the fuel for optimum performance. If the gap is too small, the mower may not be able to spark at all. The fuel will soak the contact and the plug will foul.
The spark plug gap refers to the distance between the electrode and the ground point on a spark plug. The gap needs to be set to the factory recommended setting to fire properly. Too much and the spark is weak, too little and there isn't enough spark to fire the mixture. Several styles of gap gauges are made. They all have a piece of metal or heavy wire that is a certain size. The gap is determined by the size of metal or wire that will slide easily into it. spark plug gap is the distance between the electrode and the contact tab on the bottom the little gap in the bottom needs to be set via the gap specs provided by the manufacturer to obtain the correct magnitude of spark
There is no such sticker on such an early model. The standard gap with original spark plug should be 0.032 inch. under the hood thereshould be a white sticker with emissions information on it stating the vrious specifications of the vehicle spark plug gap is typically loated there too
The way I would verify the gap is to go too www.NGK.com, and enter the info on your car. The site will show the available brand names of spark plugs, their respective part number and the gap for each brand name. Good Luck.
what is the correct spark plug gap for ford 1.6 16v 1998... The correct gap is 1.0mm... ford originally set them 1.3mm then found it was too hard on the HT leads and coil pack.
Just changed plugs on my 1999 aurora and the gap was .05. It stopped a hesitation at idle too!
The engine would either not start or run roughly.
I was just looking for this too, Autozone and O'Reilly told me it is 0.044 for the 02 Forester
good rule of thumb on spark plugs. .035. If it's too small, it will still fire. If it too wide, it won't.
As you are not too specific about which 4 litre engine you are referring, a good rule of thumb is 0.05 inches.