can anyone tell me why i keep throwing overboost code with a drag comp. i got the code with my comp so i called edge and they said it was the box so i exchanged it for a drag comp while i was at weekend on the edge. today i pulled codes again and ive got 0234 again. has anybody else had this pain problem. if so what was the fix?

thanks in advance, mooseman

 

Did you clear the codes after exchanging the first box? If not just unhook the battery cables for about 30 min to clear it. Scott

 

i have had the codes cleared several times. clear it now and it pops right back.
i spoke to a guy at a diesel perf. shop today. he said he has seen some trucks come in with the same codes, clears them goes for a ride comes back and its back but the truck ran great on the drive with the scanner hooked up. he says as long as i do not get a check engine light its ok. sure dont seem to have the power it should but it could all be in my head.

 

And I'm guessing that the boost fooler is working. As in it's not going into limp mode when you reach a certain level of boost. Is it possible that the connection to the MAP sensor is dirty and is not allowing the box to operate properly and consequently is throwing a code? Scott

 

its not going into limp mode yet. ive cleaned the connections with electric parts cleaner twice. going to go get the codes cleared again today and see what happens. i dont think it has hurt my performance but id like to know whats not working correctly. mooseman

 

If it was doing it with your old comp, and now doing it with the new comp, that rules out the box.

You've cleaned the connectors a couple times, so I'd say they are ruled out.

Only thing left is the MAP sensor.

I know the comp changes whatever it sends to something under 20psi to prevent defueling.
Not sure what the comp does if it isn't getting the right signal from the MAP sensor though?
Or, if the Comp only changes the signal after a specific point, or RPM?

Perhaps the MAP sensor is sending way too much boost right off the bat, maybe at idle speed even, so the comp hasn't gotten around to fixing the signal yet?


Just some thoughts.


phox

 

After responding to Mooseman I thought I would go out and have a look on my truck just to see. As it turns out I'm getting the same thing and I can't clear the codes. The other odd thing is that there is a white stripe (looks like liquid paper) going across the connections. I hadn't noticed this when I put my Edge Comp back on earlier this last week from when it was at the dealer for a totally unrelated problem. The local carwash competely destroyed my steering column, but that is a different thread altogether.

Mooseman,
Did your truck have to go to the dealer for ANY reason lately? Normally I don't get into wild speculation, but I wonder if dealers are starting to do some sort of surveilance on trucks they believe might be bombing. Scott


BTW truck runs great so I know its not the box's boost fooler gone bad.

 

thanks phox for the info. ive had the map sensor checked at the dealer and it checked out ok. they put a new one on just to make me happy. thanks mooseman

 

Hope that fixes it.


phox

 

psalm69,
i have been to the dealer a week ago. they had me pull my truck right in so i hung out with the tech while he checked and changed the map sensor. he did mention a time or two that they should not be doing this under warentey because of the comp and the hybrid turbo. they seem to be human and are willing to help a guy out. mooseman

 

it didnt.

 

Mooseman,
There is another very similar thread going on in 24 valve
https://www.dieseltruckresource.com/...threadid=49538

See if it works that way. I'm getting curious to know. Scott