Injector oulsewidth drops after 5700 rpm

[w3tbanana]

So I recently did a topswap on my 2005 Buick Allure, and it runs real good. But for aome reaaon my injector pulse width just drops after 5700 rpm in WOT. I dont feel like its a sensor issue, and if I try to command more fuel it still just drops. This is causing leaning out. I checked the fuel pressure while going into WOT. It stays at 58-60 psi. I do have 60lb injectors in right now. I dont know if there is a bad ground or something else going on. Any ideas on where to start my diagnostics?

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[Fivefingerdeathpunch]

What software are you using to tune?

If it's HP Tuners, looking at the log would be helpful for me as I have that software.

[w3tbanana]

I have hp tuners, ill load up a log

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https://www.dropbox.com/s/5s5pz0r5ep...%20PW.hpl?dl=0

[Fivefingerdeathpunch]

Post the tune file as well.

Remove the 1 bar map channel and replace it with the 2 bar map channel so you can read boost in the scanner. I'm assuming you are running a 2 bar map. Something seems off if your wideband is correct. You are commanding 12's but your wideband it always in the 13's at WOT.

[w3tbanana]

Here is the tune I currently have uploaded to it. I tried running a 2 bar map sensor, but it does not work. Car runs like **** and is hardly drivable. https://www.dropbox.com/s/m99bl1l4y0...0%20e.hpt?dl=0

[Fivefingerdeathpunch]

So adding like 5% to the MAF curve up top hasn't helped with it leaning out?

[w3tbanana]

Ill try that next, it just looks like the injector pulse width just drops

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[Fivefingerdeathpunch]

The pulse width drops from like 9 to 7.5 but the o2 sensor drops from 900 down to 50.

[w3tbanana]

Ya, so I dont know. Ill do that and check my fuel pressure again while doing it. See how ot works out

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[Fivefingerdeathpunch]

http://www.grandprixforums.net/threa...ht=swap+sensor

Read the last post about why your 2 BAR map may not have worked for you.

These computers are so limited on what you can change and watch because they have so little data. But I could see an issue with the baro/map going screwy and causing it to lean out as it doesn't know exactly what is going on.

[w3tbanana]

http://www.grandprixforums.net/threa...ht=swap+sensor

Read the last post about why your 2 BAR map may not have worked for you.

These computers are so limited on what you can change and watch because they have so little data. But I could see an issue with the baro/map going screwy and causing it to lean out as it doesn't know exactly what is going on.

You talking about the baro sensor?? I will look into getting a second sensor setup for it. I dont know of its because the GTP has two map sensors or what. I didnt think my car had a baro, but I can read it.

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[w3tbanana]

So I added some fuel up top. And it did not help any. Injector pulse width still goes from 9 to 7 during WOT. Any other ideas?

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[Scottydoggs]

try turning the injector flow rate up top? get the right map on there yet?

[w3tbanana]

Ya ive got a single bar map which is what the pcm ran with originally. I was thinkimg of making the fuel injectors smaller seeing if that would help.

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