map sensor
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map sensor
Sons truck is running bad with no boost. We looked thru the forums and changed the fuel filter along with other recommendations; no help. Unplugged the MAP sensor and truck runs great with boost. Purchased new MAP sensor and installed it; truck still does not have boost or power. Unplugged new sensor and again truck runs great. Not sure where to look now. It seems to me that another sensor must be bad but not sure which on and how to test. Any help would be great .
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Sons truck is running bad with no boost. We looked thru the forums and changed the fuel filter along with other recommendations; no help. Unplugged the MAP sensor and truck runs great with boost. Purchased new MAP sensor and installed it; truck still does not have boost or power. Unplugged new sensor and again truck runs great. Not sure where to look now. It seems to me that another sensor must be bad but not sure which on and how to test. Any help would be great .
If you don't know somebody with AutoEnginuity software, is it in your budget to spend $360 on software/hardware/Ford bundle to install on a laptop/netbook? This software has saved me a ton of money already because it helped me troubleshoot a number of items on my truck. If I took mine to the stealership, they would use similar software - but in the sterile environment of a service bay. I found my trouble on the road, not in the driveway.
Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
Someone correct me if I'm wrong here, but isn't boost calculated from the difference between MAP and EBP? Couldn't the problem be a biased EBP sensor and this is skewing the boost data processed by the PCM? I would connect the MAP sensor and try disconnecting the EBP sensor and see it if runs better. The EBP line and sensor are known to get plugged with soot and give false readings.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Someone correct me if I'm wrong here, but isn't boost calculated from the difference between MAP and EBP? Couldn't the problem be a biased EBP sensor and this is skewing the boost data processed by the PCM? I would connect the MAP sensor and try disconnecting the EBP sensor and see it if runs better. The EBP line and sensor are known to get plugged with soot and give false readings.
Lead Driver
Joined: Sep 2010
Posts: 7,793
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How would one go about testing the MAP, with no AE? Can the v signal be tested with a multimeter? and if so, how...thx
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Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
Take a look at the picture below. Just measure pin #1 and see if you are getting 5 volts DC.
The output will be lower depending on barometric pressure. That voltage changes with boost and that is what provides the signal to the PCM to what the sensor is seeing.
The output will be lower depending on barometric pressure. That voltage changes with boost and that is what provides the signal to the PCM to what the sensor is seeing.
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Hotshot
Joined: Jan 2011
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From: Puget Sound
Lead Driver
Joined: Sep 2010
Posts: 7,793
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Once again, Ken comes through..
. Tugly, you aint far behind, you keep tweek'n with that AE..
Reason for ask'n, is because, Tugly, you found what my max psi is. I've been chasing low boost for a year, and that # you posted is EXACTLY what i'm get'n, according to my gauge.
Thanks guys.
. Tugly, you aint far behind, you keep tweek'n with that AE..Reason for ask'n, is because, Tugly, you found what my max psi is. I've been chasing low boost for a year, and that # you posted is EXACTLY what i'm get'n, according to my gauge.
Thanks guys.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Once again, Ken comes through... Tugly, you aint far behind, you keep tweek'n with that AE..
Reason for ask'n, is because, Tugly, you found what my max psi is. I've been chasing low boost for a year, and that # you posted is EXACTLY what i'm get'n, according to my gauge.
Thanks guys.
. Tugly, you aint far behind, you keep tweek'n with that AE..Reason for ask'n, is because, Tugly, you found what my max psi is. I've been chasing low boost for a year, and that # you posted is EXACTLY what i'm get'n, according to my gauge.
Thanks guys.
14.7 PSI is with the engine off (about 5V). I'm confused timmyboy76, What are your readings/symptoms?
Lead Driver
Joined: Sep 2010
Posts: 7,793
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O...lol. My readings SUK. I've chaulked it up to it being the W.W. causing low boost. In other words, with redline disconnected, i can ONLY hit 15/16psi WOT. Maybe my trans has something to do with it..(zf6 wierd noise). Tried different turbos, ordered up a set of plenum boots from Clay, nothing helped, but those boots are bada$$. PSI seem to come on strong/sooner, with those things. Gotta save a few more pennies to finish the boot kit.
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
Here are EBP Sensor pins.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
O...lol. My readings SUK. I've chaulked it up to it being the W.W. causing low boost. In other words, with redline disconnected, i can ONLY hit 15/16psi WOT. Maybe my trans has something to do with it..(zf6 wierd noise). Tried different turbos, ordered up a set of plenum boots from Clay, nothing helped, but those boots are bada$$. PSI seem to come on strong/sooner, with those things. Gotta save a few more pennies to finish the boot kit.