p0300 code bad ecu?

[383camaro]

ok so lets say I can get my hands on a 00 ecu and harness pretty cheap can I use that harness in my 98 firebird I know the temp sensors are different and I have one sitting around in the garage. is it as simple as ill just have to repin the connectors that go back into the car that hook up under the dash. Just curious sounds like a lot less wires to repin

[slows10]

Can you change the misfire counts or sensitivity in the tune? I thought I remember seeing or hearing something about it.

[slows10]

Also agree with joecar and change the ecm. You have tried pretty much everything.

[383camaro]

So I re pinned the harness and got a 411 pcm for the junk yard now how do I change the os to an f- body os instead of a 5.3 Silverado os I tried an 00'' f-body tune file and did a full reflash and it said it completed but it never changed

[ScarabEpic22]

You have to full flash the PCM to change the OS. Did you read the tune back out of the PCM after full flashing?

[383camaro]

since the os are different between the truck to the fbody my personal efi live wont do a full reflash So now what are my options :(

[ScarabEpic22]

since the os are different between the truck to the fbody my personal efi live wont do a full reflash So now what are my options :(

Upgrade to a Commercial license is your only option. I forget that V1s didnt all do full flashes, all V2s do because they come with a Commercial license.

[383camaro]

I have the v2 but its not doing the full flash after the count down it says access denied

[joecar]

I have the v2 but its not doing the full flash after the count down it says access denied

Post a screenshot.


Are you running as admin on Win7/8...?

[383camaro]

Win7 and I will try when I get home. I talked to a rep from efilive and he told me that I should be able to do a full flash from my v2 he told me to make sure my v2 was up to date and check the firmware so I gotta do that too I will keep you posted