Where is it?

i always thought the barometric pressure was weather related.

 

On DDEC VI, the sensor is inside the MCM, as Pablo quite correctly said.
Barometric pressure sensor detects altitude basically, not the weather...lol
Thinner the air, the fuel needs to be adjusted. When I get to @6000ft and above, I lose boost. It's part and parcel.
The resistor trick doesn't work on our (DDEC VI) model engine, so try something else OP.

Martin

 

I have heard of moving the intake air temp sensor from the intake to the CAC pipe to correct a low power coughing complaint. I've never done it, but I hear that the sensor heat soaks and can cause issues.

 

Weld a bung in the cac aluminum? Or somewhere to try it already there?

 

I dug up my notes from a few years back on this. Erich at Serious Series 60 gave me some help on one, but the truck got totaled before we could try it. An intermittent stutter or backfire under load with a puff of smoke could be that the intake air temp sensor is heat soaking. You can install a 10K ohm resistor in the white wire of the intake air temp sensor. If this solves the issue, then heat soaking is the problem. It is not wise to leave it like that though because it will not turn on the fan if intake temps get too high. Once it's verified that heat soaking is the issue, relocate the intake air temp sensor to the CAC piping.

I never got that far, so I don't know if that was our problem or not. Erich is very knowledgeable with S60's, I trust him, but I cannot say that it works or not. If the resistor fixed the issue, my next step was to relocate the sensor. My though was (on our truck), there was a short steel CAC pipe before the ITV. I was going to weld a 1/4" slug to it so I could drill and tap it for the sensor. Like I said though, the driver wrecked the truck before we could try it.

http://www.ss60pd.com/ Is the site. Erich was a nice guy, he may give you some info if you want to verify, or he may have other idea's.

 

Many thanks, will see about giving that a shot with a 10k resistor wired inline on the white wire to the intake air temp sensor.
It does seem to do it when up to temp, and not as much when cold (although I let it warm up etc before leaving out as a rule).

Martin