P0300 won’t go away!!!

I went and picked up a new EGR because it has the original one, rather than cleaning it and guessing I just figured ‘before it DOES go out’ if it ever did or if it is…

Installed it, while torquing down the bolts the ear on one side where the bolt goes through snapped off in two…

Not a good week this week…

The bolt flange of the EGR valve broke? Or the upper intake manifold broke?

Schurkey said:

The bolt flange of the EGR valve broke? Or the upper intake manifold broke?

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Bolt flange, where the EGR has the bolt go through on the driver side it cracked on install but I didn’t catch it. Either way it’s not pulling any carb spray in when I tested to see if it was pulling any air in as in a vacuum leak, obviously I’ll still replace it. Just tired of throwing money at it for now…

I did however get some read out from a legit scanner but I don’t even know what I’m looking at to be honest, maybe someone can see something I don’t even understand?

I’ll post video clips later but I was able to sit and actually look at everything yesterday. I tried doing a crankshaft position sensor relearn but the trucks temperature wasn’t high enough on the scanner and compared to the dash temp they were about 10-12 degrees off the dash showing hotter, it never went past 151 degrees on the scanner…

I also found a U1041 code and a P0440 code while checking everything…

Did you ever figure it out?

FWIW, I had a NBS 1500HD that I was working with recently that kept popping P0300s. Finally discovered that it had never had a crank relearn since it recieved a new engine. I did the crank relearn and the P0300 and flashing check engine light went away. What I learned with that is the PCM can set a P0300 because it needs a crank relearn yet not set a P1336 at the same time.

L31MaxExpress said:

FWIW, I had a NBS 1500HD that I was working with recently that kept popping P0300s. Finally discovered that it had never had a crank relearn since it recieved a new engine. I did the crank relearn and the P0300 and flashing check engine light went away. What I learned with that is the PCM can set a P0300 because it needs a crank relearn yet not set a P1336 at the same time.

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I'm guessing that caused a lack of lockup? When would the CEL flash?

Supercharged111 said:

I'm guessing that caused a lack of lockup? When would the CEL flash?

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Really it would happen under load the most at lower rpm and it would force the converter unlocked.

Hey guys, I didn’t want to leave anyone hanging. I figured out what my P0300 problem was, it was a performance chip/computer someone added onto the truck before me. I removed it and it runs like a BRAND NEW TRUCK.