3800 Top Swap, maxing out LQ4 Maf?

[Dusty05]

It feels like the MAF is maxing out at the very top of 1st gear. As you can see I have no KR, and I also am locked in at 11.5:1 AFR

It's doing the usual shut the engine down, then it slowly comes back up to idle like a maxed out MAF behaves.

I brought the max HZ to 20K and shut off the p0103 High fail, but that had no effect. Do these pcms also look at max grams/sec? Can we even adjust that limit?

Here's the scan.lesabrecut.hpl

Setup: GenV, 3.5 pulley, l36 block, headers, 1.9 RR, Ported heads and LIM, 3" exhaust

[5FDP]

No way it should be maxing with those mods, thats not enough air flow yet.

But did you bring over a MAF table from a LQ4 motor into your tune?

[Dusty05]

Yeah I'm using the LQ4 table, the a/f is pretty close. I see in the scan I am hitting 32.92 lb/min

[5FDP]

On my old 2000 GTP, the stock maf table could support 32-33lb just fine, thats only 10,150ish HZ which is well before the max of 11,500.

I've never dealt with a top swap like this, I'm used to the MAP sensor being there aswell.

[507]

Just wondering, did u remap ur VE tables?

[Dusty05]

ok I looked. I have not remapped the VE, would that cause this to go into that shutdown mode?

[Dusty05]

Do you guys think my l36 map might be hitting 1 bar and causing some sort of safety shut down?

[Dusty05]

You're correct, my maf isn't going to Max HZ, highest I can pull is a 10,600. I took the l36 map out of the equation and that didn't change anything. Not sure where to go from here...

[Dusty05]

Is there any other safe mode that can shut down like this?

[507]

To small of a air filter or dirty filter can do it. For the hell of it try taking the air filter off and see what happens. Never know.

[Dusty05]

I'll give it a shot tonight. I have a 4" CAI to a very large filter, but not sure what condition the filter is (its hiding inside the Lesabre bumper)

[507]

Other then that if the fuel pump is not able to supply enough fuel it the motor it well shut down like u explain above. At high rpm. With that one youll need a fuel Gauge for that one.

Good luck
Be patient
You well get there.

[Dusty05]

Thanks, that was my original thought, but a few guys said they have turbo setups with their l36 pumps...unless the Lesabres got weak pumps from the factory lol

[Dusty05]

Did a running fuel pressure check. The pressure doesn't drop at all when the car stalls at the top of first gear. Have the 3800s ever had a problem over pumping the lifters? I have 1.9 rockers and intense pushrods on here