Gmvehar

So I got some more issues going on with the car. I was forced to take the fuel man off cause of missfires and backfires. But now Im getting a code thats coming up and it says random missfire? Anyone elso having this problem. My friend is also having this issue but we cant seem to find the sorce. PLease help!!!!

Warrtalon

iTrader: (6)

What the heck is a fuel man? If you explain what that is, then maybe we can help.

If you're getting P0300, that's the most common problem of all Evo VIIIs (mainly 03/04). Please search to learn about that as it has been discussed ad nauseam.

The normal cause for misfiring is fouled plugs. The cheapest and quickest way to troubleshoot this is to go to Advanced Auto and get a set of 4 NGK BPR7ES plugs (#2023), gap them to .026, then slap 'em in. If the problem persists, we move on from there, but if you're getting P0300, then that's a known defect.

nrcooled

iTrader: (4)

I just got the P0300 flash from the dealer. Haven't had an issue since.

It will get rid of your flash (if you had one) but getting rid of the flash was a good thing in my case

Gmvehar

Fuel Management System. I have a emanage ultimate. I have checked the plugs and One was off and we corrected them gapping. It fixed the problem but two weeks later the problem came back. It is no longer the plugs. The fuel management system also has a custom tune but it is missfiring with outh that right now. What is the p0300 and all this flash stuff refferring too.

Gmvehar

See this is odd, cause the car is running great right now. I was thinking maybe its the gas but its broke and fixed the problem on one tank of gas....

Gmvehar

bump

evopenn

I have had the same problem with mine i just got done putting the white rabbit turbo in mine a 255 wlbro fuel pump and new injectors i also hae a greddy front mount a manuel voost controller supermegaflow intake with hard piping to the turbo a forge wastegate actuator and a forge recerc with hks exhaust all the way back with cat delete . i have change the plufs back to stock with the propper gapping and all and the problem keeps goin on at half throttle with min boost and at full throttle just at 4 grand and up so what else is there to do would getting new coils for the car be a next thing i could look at ? another thing i wonder is if it is the fuel pump flowing to much fuel casue when i go wide open the a/f goes to the 9.4to 1 so what else is there to check really need to figure out what is going on please help.

mitsuorder

iTrader: (106)

Are you running aftermarket wires or stock? Try switching back to your stockers if you're running magnecores or something. If you're on stock how many miles on the wires?

evopenn

i have about 37 thousand miles on the wires

mitsuorder

iTrader: (106)

If you have a friend with another evo try their wires out real quick. Any time I've had similar problems it was due to worn out or damaged wires. Give it a shot if you can.

evopenn

it coudl be caused by a to rich of mixture in the car casue when i got the tune on the car we hooked a wideband up to it at at wide open throttle i had about 9 something air/fuel so it could be the problem so if anyone knows then please help

evodrivesme

iTrader: (7)

i am having the same problem and im going to check my plugs today and probably buy new ones to try that but my car is also running really rich right now like im getting 80 miles to a half tank of gas.