View Full Version : car have a bad miss after tune up

07-30-2002, 11:08 PM
its a 89 240sx. after i did a tune up (sparkplugs, wires, oil change and air filter) it got worse. it was only slightly before and right afterwards it was really noticeable. got any clues? sparkplug gap? i check for a vacuum leak with some carb clean but no go

07-31-2002, 01:13 AM
Aside from the sparkplug gap, Did you happen to mix the firing order?

If that is not it. check to see which cylinder is misfiring. Then check for spark on that cylinder. then see if the fuel injector is supplying fuel. If not, see if the computer is sending the signal to the injector.

I hope you didn't drop anything in the cylinder.