The 1993 Pontiac Grand Prix 3.4 liter engine spark plug gap should be .028. Most spark plugs come pre-gapped from the manufacturer.
for what motor? a 3.8 L would be 0.060
.60
The spark plug gap for a 2007 Pontiac Grand Prix is .060. Most plugs come pregapped for your vehicle but it is always a good idea to check them.
2005 Pontiac Grand Prix 3.8L SFI OHV 6cylThe Spark Plug Gap.060 (In thousandths of an inch) 2005 Pontiac Grand Prix 5.3L SFI 8cylThe Spark Plug Gap.040 (In thousandths of an inch)
.060 in
There are some comments that you should not adjust the gap sizes of the plugs and use them the way they come out of the box. Hmmm .. I have a 1999 Grand Prix GTP with the 3.8L V6 supercharged engine. My GM owners manual states a gap of .060 for all the replacement plugs listed not only for my engine but for all Grand Prix engine sizes of that year 3.1 / 3.8 / 3.8SC Check your GM owners manual .. it will state there in the section of different replacement parts, what spark plugs to use and the gap size
0.060 - at least from plugs Napa sells. Other plugs may have different gap or have preset gapping
There is also some comments that you should not adjust the gap sizes of the plugs and use them the way they come out of the box. Hmmm .. I have a 1999 Grand Prix GTP with the 3.8L V6 supercharged engine. My GM owners manual states a gap of .060 for all the replacement plugs listed not only for my engine but for all Grand Prix engine sizes of that year 3.1 / 3.8 / 3.8SC Check your GM owners manual .. it will state there in the section of different replacement parts, what spark plugs to use and the gap size
There are some comments that you should not adjust the gap sizes of the plugs and use them the way they come out of the box. Hmmm .. I have a 1999 Grand Prix GTP with the 3.8L V6 supercharged engine. My GM owners manual states a gap of .060 for all the replacement plugs listed not only for my engine but for all Grand Prix engine sizes of that year 3.1 / 3.8 / 3.8SC Check your GM owners manual .. it will state there in the section of different replacement parts, what spark plugs to use and the gap size
The plug gap should be set at .045
.60 is the stock gap
on a 3.1 it is 0.60