I started using AE to track what I felt was a low power condition on my 02 F250 7.3. It is stock except for HPX line and pre-pump mods with 43K. I had gone over most everything hit and miss until I purchased AE. Using AE and gathered data seemed to show a low boost condition. I had checked to make sure the boots were tight. The intake boots took a bit of tightening but boost stayed the same. I have not done the CCV mod and each of the boots showed signs of oil. The intake boots were the worse. I made the device to test for boot leaks but didn't come up with anything.

Last weekend I pulled all the boots and cleaned them up real good and made sure they were in good shape. I used hair spray when putting them back on. Did same run into town and captured more AE data. While I had the boots off I pulled the VC connectors and ohmed the glow plugs with a Fluke digital multimeter. They all read .2-.3 ohms. Last year I replaced the GRP just for the sake of doing it.

I created an album in my gallery called AE Results. I posted two graphs from AE. One is prior to cleaning the boots and the other after. I want to capture some more data but the boost now seems more in line with a stock 7.3. Power seems up as well.

Craig

 

Did I read that right? You gained 6 pounds of boost by doing nothing more than cleaning the oil off the boots, and they didn't leak when you pressurized them with the test fitting prior to?

Don't get me wrong, I believe what you say...er, type...but I must confess I find it very surprising.

 

I guess I should have explained the pressure test a bit more. Based on the results in the graph I would have to say they had to leak when I pressure tested the boots. When I pressure tested the boots I was having issues getting the tester to seal. When I applied pressure all I heard was air leaking where the tester was at. I tried to stop that but it was getting dark and I needed to get the truck back together. Winter came back for a few weeks. Just this past week I decided to just take the boots off and clean and inspect them. I didn't try the pressure test again prior to cleaning the boots. I'm thinking my problem was with the intake boots. They seemed loose while taking them off and before I loosened the clamp. I think the oil had gotten under the boot.

I drove it again last evening but wasn't using AE. Seat of the pants tells me it is running much better. I would think it has to as the graph doesn't lie. Been tracking this lack of power since I bought the truck last April. I was starting to think this is how it should be until I got AE and looked at the boost numbers. I found a friend a few months back who has the same year truck as mine. It was stock like mine. He offered to let me drive it. I did and it seemed better then mine but not by much. At that point I kind of gave up and assumed mine was running as it should but it was a bit disappointing. I decided to purchase AE and look a bit deaper. Glad I did. I will be watching it with AE for some time to monitor the results. Might mentioned this to that friend. I wouldn't have believed it since I went over the boots by hand looking for damage and making sure they were tight. They were as tight as I could get the clamps.

Craig

 

Copied from ITP Forum:
When you do comparative logs try to capture the same data elements.

In the second one the exhaust backpressure sensor appears to be clogged. Notice how the pressure just slowly rises.

Boost is wild in the second one how much weight were you towing?

Here is what I would capture
MAP, BARO, MGP, SPEED, ICP Pressure, RPM, EBPS, WG DC, MAT

 

When I ran that second test it was just on the fly to look at boost numbers. I plan to run future tests using same data elements. I have cleaned the EBP tube a numbers of times and just recently. I also had replace the EBP sensor a few months back. When I ran that second test there was a long run down a lane before I got to the highway. First run didn't have that. Might explain the low back pressure value but will keep an eye on that. Both graphs were from driving same road into town. Not towing. There are a few grades I pull on the way into town.

Thanks for looking at this with me.

Craig