97psd zf5 10mpg with ts chip something wrong or normal? - Page 10 - Ford Powerstroke Diesel Forum
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post #91 of 137 Old 08-21-2018, 05:31 PM
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The OBS trucks may have it in a different location, does it have a metal tube running the the exhaust manifold?

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post #92 of 137 Old 08-21-2018, 05:32 PM Thread Starter
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Yes having the tube plugged up would affect your performance and MPG, I had to clean mine out a few months ago. The back pressure valve on the turbo is completely different it is controlled by the PCM to close on warm-ups. The back pressure valve and back pressure sensor are in no relation to each other.
Is there a way to clean out the pipe without removing it ?and if you rev the motor will it Blow the crap out of it

97 7.3 psd zf5 4x4 lifted on 35s
97 gmc sierra z71 5.7 vortec extra cab on 33s
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post #93 of 137 Old 08-21-2018, 06:26 PM
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Is there a way to clean out the pipe without removing it ?and if you rev the motor will it Blow the crap out of it
You can try that, I removed mine.

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post #94 of 137 Old 08-21-2018, 07:16 PM
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You can pull chip without removing the PCM. Unbolt the ebrake unit and walla acess to chip. Second the coolant temp sender only is for the gauge on dash. PCM only looks at EOT (engine oil temp) for temperature. The back pressure sensor is useless on a manual transmission truck. The sensor is not used by the pcm for any fueling and timing adjustments. It is used on automatic equipped trucks as the PCM uses it to determine load for shifting adjustments.
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post #95 of 137 Old 08-21-2018, 08:18 PM Thread Starter
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You can try that, I removed mine.
It was plugged bad. It was pretty easy to remove. Cleaning it was hard. I used weed eater line lol

97 7.3 psd zf5 4x4 lifted on 35s
97 gmc sierra z71 5.7 vortec extra cab on 33s
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post #96 of 137 Old 08-21-2018, 08:49 PM Thread Starter
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You can pull chip without removing the PCM. Unbolt the ebrake unit and walla acess to chip. Second the coolant temp sender only is for the gauge on dash. PCM only looks at EOT (engine oil temp) for temperature. The back pressure sensor is useless on a manual transmission truck. The sensor is not used by the pcm for any fueling and timing adjustments. It is used on automatic equipped trucks as the PCM uses it to determine load for shifting adjustments.
I pulled the chip a long time ago and drove it around for a while it made no difference but I had one boost leak and I fix that and then help things a lot and I believe I have another one but I've got some silicone couplers coming off of eBay real soon so I'm going to try and redo every spot that is in question. They hacked up the bank's system in order to put an eBay front mount end tank intercooler. It doesn't turn in like a stock super duty intercooler would. Worst case scenario I get a super duty intercooler and I have to get some 3-inch pipe and do some welding to the existing Banks stuff that they act up this truck in general has kind of got hacked job written all over it but what I was asking was why am I exhaust control sensor is behind the top part of the motor instead of over by the pulleys. Do I have a motor that's not original for 97?

97 7.3 psd zf5 4x4 lifted on 35s
97 gmc sierra z71 5.7 vortec extra cab on 33s

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post #97 of 137 Old 08-21-2018, 11:41 PM
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Did you ever figure out why its running cold. You probably have a stuck thermostat. I would install an motorcraft thermostat. If it runs cold oil temps will also be cold. The PCM will use the EOT to make adjustments to fueling and timing and can affect fuel economy. Get it to its running tempature and then see how the fuel economy is doing.
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post #98 of 137 Old 08-22-2018, 12:59 AM Thread Starter
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Did you ever figure out why its running cold. You probably have a stuck thermostat. I would install an motorcraft thermostat. If it runs cold oil temps will also be cold. The PCM will use the EOT to make adjustments to fueling and timing and can affect fuel economy. Get it to its running tempature and then see how the fuel economy is doing.
I think it's running normal temps the gauge reads wrong. It seems to make better power when it's really warm. My laser thermometer reads around 200 . Swapped out the stat with crappy 195 one. Longer one was what fit
I may have boost leaks that seal up after warm too. I have some silicone boost rated couplers coming from eBay. And I'm going to try to replace the actual dash gauge soon.i think it's defective. Still need steering column bearings. I order everything off eBay and never confirmed what fits and exactly what part numbers . So I've never ordered anything . Slowly getting caught up on things to where I can work on the truck more. Last night I got the correct passenger side tierod end and adjusting sleeve finally. And set a ruff toe in. Apparently it has f250 2wd stuff. Buti still need to figure out what poly bushings for these aftermarket 7 pack leafs in front then I can get a alignment.
We will see how truck runs tomorrow cold.

97 7.3 psd zf5 4x4 lifted on 35s
97 gmc sierra z71 5.7 vortec extra cab on 33s

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post #99 of 137 Old 08-22-2018, 12:22 PM
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Typically things leak worse with heat because the metal expands and the cracks open up. You may have answered this already, but have you replaced your temperature sender? Just thinking a bunk sensor could be causing your "low" temps. The sender would be easier than the gauge.

Like SuperchargedPSD said, the exhaust backpressure sensor is used for shifting with the E40D. Basically the PCM takes a backpressure reading, compares it with other operating parameters and determines when and how to shift. One of the fleet mechanics that's in charge of our line trucks told me to check that sensor/tube when I asked him about my truck shifting REALLY hard. I replaced the tube, and I was right back to firm, positive shifts.

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post #100 of 137 Old 08-22-2018, 02:09 PM Thread Starter
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Typically things leak worse with heat because the metal expands and the cracks open up. You may have answered this already, but have you replaced your temperature sender? Just thinking a bunk sensor could be causing your "low" temps. The sender would be easier than the gauge.

Like SuperchargedPSD said, the exhaust backpressure sensor is used for shifting with the E40D. Basically the PCM takes a backpressure reading, compares it with other operating parameters and determines when and how to shift. One of the fleet mechanics that's in charge of our line trucks told me to check that sensor/tube when I asked him about my truck shifting REALLY hard. I replaced the tube, and I was right back to firm, positive shifts.
I measured it with an ohmmeter and it tested good but there might be some problem with the wiring or the gauge
I can't stand this to zf5 complete garbage crap box so I guess it doesn't come into play with mine

97 7.3 psd zf5 4x4 lifted on 35s
97 gmc sierra z71 5.7 vortec extra cab on 33s
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