P0300 CEL - Multiple Misfire Detected?!

[JLangevin]

Any idea on this code and what to look for? The light came on but no difference in performance or anything. When the light came on, I felt an initial retardation in timing but as fast as it happened, everything went back to normal. The wires and plugs are new. They are the NGK plugs and I forget which wires, but none the less, I did not feel anything at all. When I pulled the code on my OBDII reader, I cleared it and after about 10 miles of city driving, it hasnt come back. This isnt the first time it did this, the other time the code cleared itself before I could pull it.

It was about 105*F and cruising at 70mph and no boost when the CEL came on... so what do I do from here. So far, there is no break down.

 

[Artago]

i have been told that you can change the power transistor in some causes, and i have been told that it will fix the problem.

I'm going to be trying that soon. I hope it work and I don't waste a hundred bucks. If it works, I'll post back.

 

[PieEyedPiper]

Artago, what have you tried so far with no resolution and what is next on your list?

Also, whats with post 23 & 24? After reading them a few times I think I'm missing something..

 

[Artago]

Artago, what have you tried so far with no resolution and what is next on your list?

Also, whats with post 23 & 24? After reading them a few times I think I'm missing something..

There was a picture in Post 23 and 24 which is no longer there. I saved it to my comp... I think.

So far I've tried replacing the MDP and Transistor pack. The error code has not come back in 2-3 days. So far so good (knock on wood). If it comes back then I will let you know.

But the car does seem to run better (smoother).

Anyways, only time will tell.... check back with me in a few days/weeks.

 

[STM tuned]

There was a picture in Post 23 and 24 which is no longer there. I saved it to my comp... I think.

So far I've tried replacing the MDP and Transistor pack. The error code has not come back in 2-3 days. So far so good (knock on wood). If it comes back then I will let you know.

But the car does seem to run better (smoother).

Anyways, only time will tell.... check back with me in a few days/weeks.

Hopefully it fixes it. My car started to randomly misfire alot near the end of summer, giving me the P0300 code. I too also found in a search here, that The transistor packs apparently go bad and can cause the car to run bad like mine was on 2 cylinders. My car is off the road now but I will be changing the transistor pack before I put it back on the road and hopefully it will fix it. let me know how yours turns out!



-Brian

 

[Artago]

Hopefully it fixes it. My car started to randomly misfire alot near the end of summer, giving me the P0300 code. I too also found in a search here, that The transistor packs apparently go bad and can cause the car to run bad like mine was on 2 cylinders. My car is off the road now but I will be changing the transistor pack before I put it back on the road and hopefully it will fix it. let me know how yours turns out!



-Brian

So far so good.... 4 days and counting without P0300 or P1400.

Knock on wood.

Tom

 

[Artago]

Well it looks like a spoke too soon. I just threw the P0300 code today. It was fine for like 4 days and then I started my car up after work and it sounded like it was firing on 3 cylinders and immediately threw the P0300. I'll monitor it for a while and post back. If it keeps coming back then I'll try a MAF swap.

Tom

 

[Nofear20]

Artago, what did you figure out?

 

[Artago]

Artago, what did you figure out?

Nothing really... It's throwing the code less frequently now. The only thing I did was fix a vac leak in the TB and fix my high idle and idle surge. I have more vac/boost leaks. Maybe that's what is causing it.

I'm going to fix all the vac leaks and boost leaks.. see if that helps.

I'll post back once I have everything done.

Tom

 

[DiamondStarM]

my issue was resolved with a new ecu...

 

[Artago]

my issue was resolved with a new ecu...

Lucky.... I'm tried an ECU swap already and no luck.

Tom

 

[asexton6969]

Hope this may help.

 

[Artago]

Hope this may help.

I does. Thanks.

Tom

 

[Nofear20]

I'm getting the CEL but my car runs like shit when it comes out. Loses all power. Like I read in another thread it basically feels like its running on 2 cylinders. I reset the ECU and it stops doing it for a while but then starts again. I have no idea what to do but was told it may be becuase of my 6 bolt swap, something with the CAS?

 

[PieEyedPiper]

I'm getting the CEL but my car runs like shit when it comes out. Loses all power. Like I read in another thread it basically feels like its running on 2 cylinders. I reset the ECU and it stops doing it for a while but then starts again. I have no idea what to do but was told it may be becuase of my 6 bolt swap, something with the CAS?

In your situation, this has everything to do with your 6 bolt swap. You need to experiment with a "Black Top" CAS, and if one or 2 of those doesn't solve your problem. Turn to DSMLink.

 

[forumboarder154]

So what fixed the problem because I have the same problem on the highway over 3k rpms?

 

[DiamondStarM]

new ECU for me...