great white
Well-Known Member
So, a barometric sensor seems to indicate you have an l56 (vin s). My l65 (vin f) only has a map sensor and that's how they all came to the best of my knowledge.
If you have an l56, it should have come with an egr valve. By the sounds of it, someone has been unplugging things under your hood. Check to make sure the egt circuit is either working as per or has been properly inhibited. A leaking inhibited egr circuit or a malfunctioning one can cause poor running. A reflash or chip (can't remember your year) can turn all that....."stuff"..... off properly in the program. Essentially, you get the l65 program. Then you just have to make sure it's blocked off in the lower manifold.
The 6.5 TD does have a map sensor, but it's a 2 bar map sensor and it's mounted on the intake. Performs a different function from the baro sensor (which is also just a map sensor but a 1 bar) on the firewall. The baro sensor is open (unplugged) to read the ambient barometric pressure and the pcm compares it to the data from the 2 bar map sensor. The pcm uses this info in the lookup tables in the program. Again, to the best of my knowledge, l56 engines have a baro sensor l65 engines don't.
This isn't also one of those trucks with a maf sensor is it?
Good luck.
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If you have an l56, it should have come with an egr valve. By the sounds of it, someone has been unplugging things under your hood. Check to make sure the egt circuit is either working as per or has been properly inhibited. A leaking inhibited egr circuit or a malfunctioning one can cause poor running. A reflash or chip (can't remember your year) can turn all that....."stuff"..... off properly in the program. Essentially, you get the l65 program. Then you just have to make sure it's blocked off in the lower manifold.
The 6.5 TD does have a map sensor, but it's a 2 bar map sensor and it's mounted on the intake. Performs a different function from the baro sensor (which is also just a map sensor but a 1 bar) on the firewall. The baro sensor is open (unplugged) to read the ambient barometric pressure and the pcm compares it to the data from the 2 bar map sensor. The pcm uses this info in the lookup tables in the program. Again, to the best of my knowledge, l56 engines have a baro sensor l65 engines don't.
This isn't also one of those trucks with a maf sensor is it?
Good luck.
Sent from my iPhone using Tapatalk