P0300 - Random multiple misfire

[corolla_2001]

Hi, y'all! I have a 2001 Corolla(51000 miles), which's been great, till recently I've had the check engine light come on with a P0300(Random misfire) 3 times in 1 month now. The first time, I took it to the dealer and he suggested that I replace all the 4 fuel injectors..and slapped me with a $1200 bill(ofcourse!0. So, took it to a local meineke shop and had them reset the light..but, it keeps coming back. I read a similar case in another forum..but, the guy didnt say how he solved the problem. Did any of u corollians have a similar problem or do any of u have any suggestions??

[SAMCO]

check the condition of your sparkplugs, you should do a major tune up at about 60,000 km so look into that .

[Chris Corolla S]

Yes, have you done all the required maintenance??

I also drive a 2001 with aprox. 50,000 miles on it and I have had no problems. I have done only the routine maintenance suggested in my Hayne's manual and this does include doing a Spark Plug change (I did mine at 40,000 miles)...

I'm moving this to the tech section...

[OEMonkey]

well the 3 in p0300 is for ignition so I dont know why they wanna replace all your injectors. besides, the likelihood of all 4 injectors being bad is close to impossible.

[qapmaz]

One of the first things to check is the mass air flow sensor. The sensor has a thin wire that can become contaminated with debris and cause this condition.

[sryabee]

My 2000 Sienna has Engine Check light on for two weeks. We checked into a local dealer and were told to use different brands of fuel and adding fuel injector cleaner to fuel tank. Been there, done that. The light is still on. Now, the dealer suggested replacing all the injectors (after pull diagnose codes: p0300, 301 and 305). By the way, my Sienna has 49000 mile and, indeed, experiences some sort of miss-fire when starting.

Any comment and suggestion are appreciated.

Thanks,

--Yabee