codes and questions
#1
03-20-2010, 05:05 PM
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codes and questions
Hello, just ran my codes and I'm not sure where some of this stuff is.
'91 F150 5.0:
Continuous code 33: EGR Valve opening not detected
Engine Running codes: 25: Knock not sensed
72: Insufficient MAF/MAP change
73: Insufficient TP change
So I don't know where the knock sensor is to check it. Any advice on the other codes would be greatly appreciated. I've been pouring over my Haynes and it doesn't tell me the location of the knock sensor. Also, what I believe is my TPS is impossible to reach. The truck idles at about 700rpm and sounds kinda rough. What should be a good idle rpm? Also, how do I tell if I have an aluminum radiator or not?
'91 F150 5.0:
Continuous code 33: EGR Valve opening not detected
Engine Running codes: 25: Knock not sensed
72: Insufficient MAF/MAP change
73: Insufficient TP change
So I don't know where the knock sensor is to check it. Any advice on the other codes would be greatly appreciated. I've been pouring over my Haynes and it doesn't tell me the location of the knock sensor. Also, what I believe is my TPS is impossible to reach. The truck idles at about 700rpm and sounds kinda rough. What should be a good idle rpm? Also, how do I tell if I have an aluminum radiator or not?
#2
03-21-2010, 09:45 AM
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Join Date: Jun 2005
Location: Easton, Kansas
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Most aluminum radiator are not painted and are silver in color.
The knock is located at the back and on top of the engine above the bell housing.
700-800 RPM should be the idle range.
I think I would check out all the vacuum lines as it sounds like you may have an leak in the one going to the EGR valve or the source to the EGR solenoid.
Did you tromp the throttle in the test when you ran it?
If not that could be the knock sensor problem.
Back probe the TPS and it should be about 0.9 VDC at closed throttle and about 4.95 VDC WOT.
The knock is located at the back and on top of the engine above the bell housing.
700-800 RPM should be the idle range.
I think I would check out all the vacuum lines as it sounds like you may have an leak in the one going to the EGR valve or the source to the EGR solenoid.
Did you tromp the throttle in the test when you ran it?
If not that could be the knock sensor problem.
Back probe the TPS and it should be about 0.9 VDC at closed throttle and about 4.95 VDC WOT.