My own Grey vs. Black CPS testing
#31
does anyone know where i can buy a black CPS i left my truck with my dad while i was gone in georgia for a few months and he had the recall done cant say i notice a difference because of the time between when i last drove it with a black one and now with the new grey, but the general consensus that i've read is black is better
#32
I have no idea, but I do not doubt folks are finding differences. It is just very hard to know why without first establishing the exact nature of the difference and then tracking down its cause. It really can't be done on a bench, if it is engine specific and it would require testing with more than one engine or at least with a device that can emulate the impact of engine wear.
Steve
#33
Curtis
Do you still have the grey cps that you have the AE testing on?
Would be nice to see an AE test with the grey sensor modded
to the same length as the black sensor. It needs a .015 to .020
cut on the mounting face to get the sensor in deeper. In other
words close the air gap to where the black sensor would be.
This does not mean that the oem sensor was set correctly to begin
with. Just like to see the AE scan with the sensor at the same depth.
Swamps test does no justice being he sets the air gap.
The air gap varies with every motor. Besides the fact that
the PSD cps was never set from the factory. The Ih motors were. (97 an on)
You want to see .025 to .030 gap.
.02
Bill
Do you still have the grey cps that you have the AE testing on?
Would be nice to see an AE test with the grey sensor modded
to the same length as the black sensor. It needs a .015 to .020
cut on the mounting face to get the sensor in deeper. In other
words close the air gap to where the black sensor would be.
This does not mean that the oem sensor was set correctly to begin
with. Just like to see the AE scan with the sensor at the same depth.
Swamps test does no justice being he sets the air gap.
The air gap varies with every motor. Besides the fact that
the PSD cps was never set from the factory. The Ih motors were. (97 an on)
You want to see .025 to .030 gap.
.02
Bill
#35
A common mod for some higher HP/higher RPM engines is to weld the cam gear down to prevent walking.
#36
I think that is an important piece of the puzzle, along with the possibility that whenever you deal with magnets, you often have some residue magnetism in surrounding components. If you then change to a component with a different magnetic strength, does it vary by vehicle?
Steve
Steve
Curtis
Do you still have the grey cps that you have the AE testing on?
Would be nice to see an AE test with the grey sensor modded
to the same length as the black sensor. It needs a .015 to .020
cut on the mounting face to get the sensor in deeper. In other
words close the air gap to where the black sensor would be.
This does not mean that the oem sensor was set correctly to begin
with. Just like to see the AE scan with the sensor at the same depth.
Do you still have the grey cps that you have the AE testing on?
Would be nice to see an AE test with the grey sensor modded
to the same length as the black sensor. It needs a .015 to .020
cut on the mounting face to get the sensor in deeper. In other
words close the air gap to where the black sensor would be.
This does not mean that the oem sensor was set correctly to begin
with. Just like to see the AE scan with the sensor at the same depth.
If they started testing in the engine first, then they would have eventually had to work backwards back to the exact same bench test anyway to rule it out.
#37
#39
I know some black ones make contact with the cam gear. The instant that happens, the CPS is dead. Maybe the fact that the grey one is just a hair shorter prevents that from happening as often. That's just a guess right now.
Not sure how often the grey ones fail. I guess time will tell.
#41
The thing with a bench test, is you would have to take a few engines and get an average measurment and then do the test off that.
setting the air gap the same with 2 different sensors that vary in lenght is a POOR test.
They should be tested at the lenght the normal idiot (us) would shove them in at, and test there.
The results from the oscilloscope will be different if the test was setup correctly.
With a sensor of this type, the distance in relation to strength and focus of the sensor is critical. It has a range in which it will read its best, and then the rest of the time it is doing more guessing.
As they say some of the CPS's cause 3 and 8 problems in timing, why? because the sensor is not focused right onto the cam gear.
The sensor relation too the timing wheel is critical. However, to most average people, it doesn't matter. Most wont notice that 3 and 8 are missing, and most wont be running big injectors and other things.
Hell, perhaps the whole windowed block problem could be caused by a poor timing reading due to the CPS providing incorrect timing info to the PCM.
If i can get the CPS's, I can do the testing if I get the cam gear and the time to jig it all up so I can precicely adjust the CPS to the timing gear setting different gaps and recording the differences in the readings.
setting the air gap the same with 2 different sensors that vary in lenght is a POOR test.
They should be tested at the lenght the normal idiot (us) would shove them in at, and test there.
The results from the oscilloscope will be different if the test was setup correctly.
With a sensor of this type, the distance in relation to strength and focus of the sensor is critical. It has a range in which it will read its best, and then the rest of the time it is doing more guessing.
As they say some of the CPS's cause 3 and 8 problems in timing, why? because the sensor is not focused right onto the cam gear.
The sensor relation too the timing wheel is critical. However, to most average people, it doesn't matter. Most wont notice that 3 and 8 are missing, and most wont be running big injectors and other things.
Hell, perhaps the whole windowed block problem could be caused by a poor timing reading due to the CPS providing incorrect timing info to the PCM.
If i can get the CPS's, I can do the testing if I get the cam gear and the time to jig it all up so I can precicely adjust the CPS to the timing gear setting different gaps and recording the differences in the readings.
#43
Thanks for the information guy's. I had to have my black CPS replaced with a grey one due to it failing on me. Figured I might as well get a spare from Ford. I had the grey one in for about three weeks, due to the fact that I have been super busy. And I noticed that it started slower, and ran rougher then when I had the black CPS in. I luckily was able to get a couple of spare black cps before they all disappeared. So I changed out the CPS to the black one again. Man what a difference. Truck runs nice and smooth again. I actually had a parts guy tell me that he has never heard of the Gray one running worse than black one. He must not be a very good parts guy. I wonder why Ford changed this anyways. Hmmmmm.
#44
They changed it because the black ones fail quite frequently. The average Schmoe would rather his truck be reliable than sound good, so they may notice the truck runs louder, but as long as they aren't getting a CEL and sitting on the side of the road, they don't care. I wouldn't think any less of your parts guy. Most mechanics and parts guys I have ever talked to know less about these trucks than the wealth of knowledge you can get on here.
#45
Resurrection time.
I was wondering if any of the additional testing mentioned was completed. Had some work done on my truck and was told the CPS (gray) was bad and the EBPV was not working properly. The gray CPS has been in my truck since the recall.
I know there are some EBPV threads on here, so I'll be looking for them, but was curious about the additional testing results, if any.
I was wondering if any of the additional testing mentioned was completed. Had some work done on my truck and was told the CPS (gray) was bad and the EBPV was not working properly. The gray CPS has been in my truck since the recall.
I know there are some EBPV threads on here, so I'll be looking for them, but was curious about the additional testing results, if any.