unburned fuel causing misfire, what is it?

[Tooprime]

I have a slight problem with my engine misfiring at high rpms shifting into second hard. I recently put in new spark plugs, but not my wires. I think it is the wires that is causing the slight misfire. (it's not any of the cylinders because I did a compression test and all were up there.) If anybody else has any suggestions please reply to this post!<P>Tooprime- 92' Blaze Red GS<P>[ October 05, 2001: Message edited by: Tooprime ]<p>[ October 05, 2001: Message edited by: Tooprime ]

[precidian]

when were your wires last changed??<BR>I know when I went to change the plugs about a year ago, I had the clip that normally goes around the plug.While the rest of the wire was in my hand. Took me a better part of an hour to get the clip and plug out from the back bank. I had re-attached the clip to the wire and found that I had lost some performance.....especially when accelerating.<P><BR>cheers,

[92MX3GS]

What type of spark plugs are you using, and are you sure that they're the best for tyour car? <P>If you're using Champions, that's your problem right there, I could tell your stories about the crappiness of those plugs.

[Bri94GS]

I'd recommend Bosch +4 Platinum plugs and either NGK or Magnecor wires...nopi.com sells NGK's for around $70...<P>did you change your cap and rotor??

[Tooprime]

Thanks for all your replys, I am running bosch platinum right now for the time being. The plugs haven't been changed probably for 75,000 km. When I had the old plugs in my car, it would not do this, only until I put the new spark plugs in. Could it be that the plugs are toast and not putting enough voltage to the spark plugs.<P>Tooprime- 92' Blaze Red GS

[Bri94GS]

I'd change 'em...it can't hurt any

[Coolzombi]

maybe a stupid question but maybe you have rev your engine too high in the redline and got the cutoff...know what i mean ...?<P>i really d'ont think its that but...<BR>good luck

[Tooprime]

I have never redlined this car, sorry!

[Custommx3]

Check the gap, you could have messed up your wires as well when taking them out to install the new ones.

[Bri94GS]

Also, try resetting your ECU (unplug your battery for about 10-15 mins)...that just solved one of my problems

[Tooprime]

replaced my plugs and reset the ecu and the problem is still there. I am now going to take the spark plugs out and re-check the gapping. (or maybe I have a faulty spark plug)

[Sonicxtacy02]

can someone tell me how you can tell your engine is misfiring... i've asked this question so many times and i still dont know!

[Tooprime]

Checked the gapping, which was set to standard and the problem is still there. I know I have a faulty O2 sensor that may be causing the problem. Or could it be a leak in the exhaust.

[MX#3]

How do you know if your o2 senser does not work?

[Tooprime]

The best way is to probably get a code scan done to tell you which sensor is faulty. Ex: O2 sensor.