New Build Issue possibly Tuning?
Thread Starter
Teching In
Joined: Jun 2022
Posts: 12
Likes: 0
From: Tennessee
New Build Issue possibly Tuning? I debated on which thread to post this on, so hopefully I am in the correct place. Here is a small detail on my build.
05 TJ - 07 5.3 from a Silverado Stock Bore
Brian Toooley Stage 4 Cam
Headers, Sheet metal Intake and 94.mm TB
The PCM was ordered Warrior Performance from an 04 Suburban. VAT deleted.
I have driven the jeep and it ran great but just a little rich. Now this was with the factory intake and TB. After I installed the aftermarket Intake that's when my fuel issues started. I changed the oil yesterday due to fuel in oil pan.
My question is could the PCM with factory tune be sending that much fuel? I plan on getting a tuner, but it should atleast start up? The injectors are new. It is dumping so much fuel that is hydrolocks.
Please advice if this would be better in the engine threads?
05 TJ - 07 5.3 from a Silverado Stock Bore
Brian Toooley Stage 4 Cam
Headers, Sheet metal Intake and 94.mm TB
The PCM was ordered Warrior Performance from an 04 Suburban. VAT deleted.
I have driven the jeep and it ran great but just a little rich. Now this was with the factory intake and TB. After I installed the aftermarket Intake that's when my fuel issues started. I changed the oil yesterday due to fuel in oil pan.
My question is could the PCM with factory tune be sending that much fuel? I plan on getting a tuner, but it should atleast start up? The injectors are new. It is dumping so much fuel that is hydrolocks.
Please advice if this would be better in the engine threads?
Thread Starter
Teching In
Joined: Jun 2022
Posts: 12
Likes: 0
From: Tennessee
Not sure if you are familiar with these metal intake, but they provide 4 vacuum ports on the bottom. As I was just looking at it I noticed I left the bigger 1 open. Could this be some or all of my problem?
Thanks again for your help.
Thanks again for your help.
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Verdad Gallardo Thread Starter
Teching In
Joined: Jun 2022
Posts: 12
Likes: 0
From: Tennessee
The ECU has never been tuned. Which brings me back to my original question, could the flooding be due to lack of custom tune for my specs? They vacuum leak is sizeable, and I have fixed that.
Thanks for the help. Guys on here are great!
Thanks for the help. Guys on here are great!
Yes. Big cam needs less fuel at idle. Stock tune has too much fuel at idle for a performance cam.
You said new injectors but never said which ones. If you bought larger injectors, without a tune, they will DUMP fuel.
Short answer- stop running it until you get it tuned
You said new injectors but never said which ones. If you bought larger injectors, without a tune, they will DUMP fuel.
Short answer- stop running it until you get it tuned
TECH Fanatic
Joined: Oct 2014
Posts: 1,220
Likes: 179
From: Virginia
As for your fuel issue at idle, it probably does just need a tune. I still get creamy mocha looking stuff out of my vacuum pump puke tank, and I’m not all that rich on most days. I might actually go down in injector size since I have duty cycle to spare and a good fuel pump. Idle is where you can only go so low with them.
Also keep in mind “false lean” which is caused by overlap. You’ll get extra oxygen in the pipe because of overlap (at low RPM) therefore causing richer numbers because the O2’s assume it’s lean and dump extra fuel that’s completely unnecessary. A stage 4 like you mentioned can easily be satisfied with a 15-16:1 idle AFR. That’s actually about what it should be when you have a ton of overlap.