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  #1  
Old 10-29-2009, 02:56 AM
dadto4boys
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Question about map sensor

I have a 99.5 7.3L Powerstroke. For the past 2-3 weeks, I have been experiencing significant power loss and MPGs. I have regulated fuel return, DIY Tymar intake, muffler delete. I have replaced all the o-rings in the turbo, checked manifold connections, all ductwork connections. I have fresh oil, fresh fuel filters, so now I am thinking possible map sensor. I'm not quite sure how to test the map sensor. I put my volt meter test leads on the wires with the connector plugged in, I was getting 5 volts at an idle. This seems way too high, but I'm not sure. Any suggestions?
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  #2  
Old 10-29-2009, 02:59 AM
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Re: Question about map sensor

Whats your fuel pressure?
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  #3  
Old 10-30-2009, 12:12 AM
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Re: Question about map sensor

65psi.
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  #4  
Old 10-30-2009, 06:45 PM
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Re: Question about map sensor

Do you have gauges? If so how much boost are you seeing? Do you see any soot around any of the exhaust connections before the turbo?

How are your brakes? If you have a brake or park brake hanging up that will really kill fuel mileage.
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  #5  
Old 10-30-2009, 06:59 PM
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Re: Question about map sensor

ive checked for leaks evryware i can think of i need to get gauges i was also thinking about wastgate is there a way to check this with out gauges
this is my first diesel thanks for the help
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Old 10-30-2009, 07:05 PM
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Re: Question about map sensor

i have also checked brakes dont seem to be hanging up
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  #7  
Old 10-30-2009, 07:09 PM
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Re: Question about map sensor

Quote:
Originally Posted by dadto4boys View Post
ive checked for leaks evryware i can think of i need to get gauges i was also thinking about wastgate is there a way to check this with out gauges
this is my first diesel thanks for the help
Unplug the redline and plug the redline and see if your boost #s change or if they just get there quicker.
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  #8  
Old 10-30-2009, 11:16 PM
dadto4boys
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Re: Question about map sensor

ok i went to the local parts store and got a boost gauge i tapped the manifold right below the map line the gauge read no boost even under throttle
unhooked and pluged wastgate line slill nothing i took the map line off and could feel some pressure but i had to put it right to my face before i could feel it
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Old 10-31-2009, 10:00 AM
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Re: Question about map sensor

Were you actually driving the truck or sitting in nuetral at full throttle? If just sitting reving it up, you will not be able to acheive boost.
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  #10  
Old 10-31-2009, 03:49 PM
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Re: Question about map sensor

I did put in in drive, and hold on the brakes and rev it up, but I did not drive down the road. I figured this would achieve a load on the engine. Tomorrow I am going to clean my EBPV tube and sensor, if this is clogged, could this cause no boost?
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