Viking155

I have a 1999 Maxima SE 5sd. The car has a little over 82000 miles. It has been misfiring lately and it does not show up under check engine light. A friend of mine told me to replace spark plugs which I did. And now the car has misfire and backfire (real loud too). Before I replaced the plugs this is what happened. I started the car up, drove it for a while with no problems. I turned it off for about an hour and start it up then the car felt like it was running on 4 or 5 cylinders, on low rpm's. When I replaced the plugs like I was told to, this time it misses on higher rpm's and it backfires real loud (Bosh Platinum plus 4). Before I replaced the plugs it kicked up a code "random misfire", whatever that would tell me. Now the computer is useless I guess, it does not show any codes. On top of all of this my oxygen sensor died. Do you think this is related to my original problem? This came up after the misfire was already going on. This misfire does not happen all the time, most of the time it happens when I really get on the gas pedal, how can you not? I am wondering if anybody had a similar problem that is driving me crazy. Any help would be greatly appreciated. Thank you in advance.

drewm

Almost all 99s had bad ignition coils, wait until your ecu gives you a CEL to figure out which coil is bad. Also, those spark plugs are horrible:
http://maxmods.dyndns.org/index.php?MaximaSparkPlugs

Viking155

Ok, thank you.

Push2TheMax

Off Topic, but Drew, those rims are nice. Black on green looks really good Mines the same color as yours so now I know how the black looks against the green. *thumbs up* And sorry about your prob Viking ( Had o2 problems before, never ever ever fun.

Viking155

Went to Nissan and got myself the NGK spark plugs, this will help with the backfire. I know this will not fix the misfire; I scheduled a diagnostics check for next week. I was told like you mentioned that 99's are known for bad coils.
Thank you again.

Ladzio

iTrader: (8)

DOn't let diller rip you off. You can easily check which coils are bad yourself!

With engine running, unplug coil one by one. If you unplug coil pack and hear that engine almost stalls - that is a good coil.
If you unplug coil and engine works the same - that is a bad one.

I had even worse, when injector did not work... took me a while to figure it out, after spending mucho dinares on another coils...

Viking155

Thanks Vlad

I really hope its not the injectors. I will try your method before I buy anything else. Thanks.