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New Stage 1s and HPOP but truck feels weak

2239 Views 7 Replies 5 Participants Last post by  klhansen
Hey guys I need some help! In the past month I have replaced my stock injectors with a set of stage 1 injectors and I've put in a new HPOP. When I first replaced the injectors the truck ran smooth but it was extremely weak, after running a test on the HPOP we decided that the HPOP was weak so we replaced it. Now the truck is running stronger but it is still not up to the performance level it was running at with just the DP tuner and the stock injectors and old pump. I have been in contact with Jody and we are trying to get to the bottom of it but I figured it couldn't hurt to see if anyone else out there had experienced this.

It seems that the ICP pressure is still on the low side especially in the lower end of the RPM range. I have a video of a data log if anyone would like for me to email it to them to look over. Can't figure out how to upload it to the post.
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What were you logging on your data log? You should be looking at ICP and IPR duty cycle at a minimum.

If you're using AutoEnginuity, you can export the data log run to a CSV file which can then be imported into Excel and a graph developed. That's the easiest way to see what's going on as opposed to looking at a bunch of numbers changing on the screen. Or you could just post the CSV file of the run.

I agree with RT, that your problem may be fuel pressure related. Getting a pressure gauge on it is the first step to checking that out.

Have you tried running it with the ICP sensor unplugged? Maybe the sensor is going bad and not getting the correct signal to the PCM. Also check the coil on the IPR to be sure that it's snugged in place and can't move around on the stem of the IPR.

You should also unload the program to see if it does the same thing in stock setting, although if your injectors are single shots, that may not work well.
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