-14.7# Boost
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Junior User
Joined: Feb 2008
Posts: 90
Likes: 1
From: Goose Creek, SC
-14.7# Boost
I have a 2004 F-250. I just towed a ~7500# Travel Trailer from SC to NY. I noticed that when I had to really get on it, once boost got to about 22#, it would show a -14.7 to a -13.6#, essentially a perfect vacuum. The truck felt like it was still pulling when this happened and there wasn't any noticeable smoke from the exhaust. Has anyone else seen this and if so, any ideas on how to fix it?
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Junior User
Joined: Feb 2008
Posts: 90
Likes: 1
From: Goose Creek, SC
Scan Gage II. I am assuming that the PCM is also seeing this value.
It reads up to about 22# on the Scan Gage II and then dives to -14.7#. The highest I saw was 22.2# before diving to a pure vacuum. The BARO reads about 29.8 to 30.0 inches of Hg, normal for the location.
I'm assuming the MAP is bad, but wondering if there could be something else.
It reads up to about 22# on the Scan Gage II and then dives to -14.7#. The highest I saw was 22.2# before diving to a pure vacuum. The BARO reads about 29.8 to 30.0 inches of Hg, normal for the location.
I'm assuming the MAP is bad, but wondering if there could be something else.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
I'd change BARO also, psia instead of Hg.... so they all read in PSI and easily compared.
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Hotshot
Joined: Jul 2002
Posts: 14,285
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From: Bend,OR
I noticed my 07 was doing showing the same on my SGII while towing. so you all are saying I need to change something on the SGII to read boost more accurately?
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Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
Baro 07E0221127 046285110627 3008 003100500000 BAR PSI
Baro 07E0221127 046285110627 3008 000A00080000 BAR Inches of Mercury
EBP 07E0221445 046285140645 3010 001D00500000 EBP PSI
EPV 07E02216AE 0462451606AE 3010 000100800000 EBPV EBP Volts
BST 07E0221440 046285140640 3010 01220320???? PSI/BST MAP Modified signal PLUG IN VALUE FROM TABLE FROM YOUR MAP
MAP 07E0221440 046285140640 3010 012203200000 MAP EXTENDED RANGE
14.0 -- FF74
14.1 -- FF73
14.2 -- FF72
14.3 -- FF71
14.4 -- FF70
14.5 -- FF6F
14.6 -- FF6E
14.7 -- FF6D
14.8 -- FF6C
14.9 -- FF6B
15.0 -- FF6A
Baro 07E0221127 046285110627 3008 000A00080000 BAR Inches of Mercury
EBP 07E0221445 046285140645 3010 001D00500000 EBP PSI
EPV 07E02216AE 0462451606AE 3010 000100800000 EBPV EBP Volts
BST 07E0221440 046285140640 3010 01220320???? PSI/BST MAP Modified signal PLUG IN VALUE FROM TABLE FROM YOUR MAP
MAP 07E0221440 046285140640 3010 012203200000 MAP EXTENDED RANGE
14.0 -- FF74
14.1 -- FF73
14.2 -- FF72
14.3 -- FF71
14.4 -- FF70
14.5 -- FF6F
14.6 -- FF6E
14.7 -- FF6D
14.8 -- FF6C
14.9 -- FF6B
15.0 -- FF6A
Fleet Mechanic
Joined: Jul 2013
Posts: 1,330
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From: 'Pitlock, Maine
MAP 07E0221440 046285140640 3010 012203200000 MAP EXTENDED RANGE
Do I also need this to make this work right? Thanks in advance for the help and sorry to the OP for tagging on here.
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
I'm gonna jump in here......no intent to hijack, same problem with an added question. My bst does the same thing (goes negative) and I did enter the new bst numbers with the four digit/letter sequence from the chart but mine still does it? however I haven't entered this yet:
MAP 07E0221440 046285140640 3010 012203200000 MAP EXTENDED RANGE
Do I also need this to make this work right? Thanks in advance for the help and sorry to the OP for tagging on here.
MAP 07E0221440 046285140640 3010 012203200000 MAP EXTENDED RANGE
Do I also need this to make this work right? Thanks in advance for the help and sorry to the OP for tagging on here.
One question, Alan. Do you have two BST values in your SGII and are you sure you're reading the one you plugged in, or did you have to change the existing?