View Full Version : 98 accord dx missfire

10-14-2009, 08:02 PM
can any one help just got a 98 accord was running good then started to get a missfire on number 3 piston changed plugs,new wires ,and cap and it has good spark so moved the injector to see if that was it but no go still miss fire on #3 car has 210000km o and looks like it is smoking a bit but its white smoke but not loosing any antifrezz or oil any ideas would be great thanks

10-14-2009, 09:55 PM
If it's white smoke, then you're burning coolant. It doesn't have to be a whole lot.

If #3 is misfiring, that could be where the coolant is burning.

Pull your plug and check the condition of the tip. That will tell you a lot.
Make sure your plug wires are properly connected, and be sure your plug is all the way in (I have damaged threads on my #3, and it pushes up occasionally... it actually begins knocking)

10-14-2009, 10:06 PM
thanks for the info but its been smoking for about 4000km and not i bit of anti freez is missing but will do a compreshon check

10-15-2009, 08:40 PM
o and for some reason i got worse when i changed the oil and filter:-?

10-16-2009, 08:55 AM
Suggest a compression check. If compression is low, a leaking valve (usually exhaust) is likely. Also possible is damaged cylinder wall, compression rings, piston leading to low compression.

If low compression is measured, a tablespoon of oil in the cylinder and a repeated compression test may show dramatic improvement, if the cause is a damaged ring, piston, or cylinder wall. If no change, then exhaust valve is likely cause of low compression.

good luck

10-16-2009, 09:03 AM
yea ok but would changing the oil mate it worse????

10-16-2009, 09:04 AM
o and could it be that the valves need to be ajusted or would that make it have a missfire???

10-16-2009, 09:17 AM
Oil change is coincidence.

Valve adjustments done incorrectly (too tight) could cause a burnt out exhaust valve. Too loose (w/i limits) should not cause missing.

good luck

10-16-2009, 09:21 AM
ok thanks o what about a worn timming belt because it is a used car and i have no idea when it was changed last

10-16-2009, 09:25 AM
No, worn timing belt would not cause #3 miss.

However, at 210Kms, it is likely never changed (probably reason car was sold), and needs replacement. No way to know for sure but downside (damaged engine) is too much to take a chance.

good luck