Topic: WOT Hesitation Above 5k RPMS With Intermittent Boost On Stock Tune

[MattM]

Nope def not the gmpp sensor.  I'll def check wiring and clean connections.

[MattM]

Anyone know where I can purchase a genuine GM Map sensor (the one that goes onto the intake manifold)?

[Sol Asylum]

Any of the GM parts places online or GM dealerships, find the part number and you can probably even order from Amazon.

[MattM]

I've been all over...its out of stock everywhere.
I'm wondering if there are other makes of sensor that work ok.

[Critterman]

Rockauto?

[elff]

Try PMing HoosierGXP.  He tends to have all sorts of spare parts

[MattM]

I found the part number and cross referenced..rock auto is out and all of the GM parts places like GM parts online etc are out as well...kind of sucks...

Has anyone used a non GM map sensor with good results?

[Uranium-238]

I found the part number and cross referenced..rock auto is out and all of the GM parts places like GM parts online etc are out as well...kind of sucks...

Likely a result of anyone with an LS trying to turbo it. That or just stealerships trying to corner the market.

Still might not be a bad idea to call your local Chevy dealership and ask.

[MattM]

I'm wondering if anyone has used a non genuine GM MAP sensor and it worked well.  If so which one?

[Uranium-238]

I've known folks to use the Holley ones, but idk if they were running factory ECMs or aftermarket EFI.

https://www.holley.com/search/?q=map%20sensor

[Steelmesh]

Any of the GM parts places online or GM dealerships, find the part number and you can probably even order from Amazon.

I recently got a counterfeit looking boost solenoid for my Cruze recently and also a counterfeit Bosch O2 sensor for my Silverado, both from Amazon.com.  My advice is to make sure the item description says specifically it is Genuine GM not just the same part number.

[Steelmesh]

I'm wondering if anyone has used a non genuine GM MAP sensor and it worked well.  If so which one?

I am running this bosch sensor from ballenger on the LE5 twincharger engine, not sure if this is plug and play with the LNF though

https://www.bmotorsports.com/shop/product_info.php/cPath/129_143/products_id/1721?osCsid=4mai498veh17m95kh08d071d04

[MattM]

That's the problem genuine GM doesn't seem to be available anymore....autozone has sure let that has lifetime warrantee but I don't know if it's any good.

[Steelmesh]

That's the problem genuine GM doesn't seem to be available anymore....autozone has sure let that has lifetime warrantee but I don't know if it's any good.

https://youtu.be/mEB7WbTTlu4?t=76

[MattM]

The thing that blows my mind is that my car is running much better with the map cel!!!  I'm getting 22 to 26 psi no hesitation and less knock...

Anyone know why that is?

[MattM]

https://youtu.be/mEB7WbTTlu4?t=76

Hahaha!!! Kudos to you sir for finding a way to include a Tommy boy clip logically into a conversation!!!! I give you infinite stars!!!

[MattM]

So I decided to bite the bullet and just got the upgraded Trifecta custom tune to get them to really look at my datalogs.  They did find something that they said they have never seen before.

Esentially, ONLY above 5,000rpms my spark advance intermittently goes from 12 advance to 6 advance back up to 12.  It's obviously not what the tune is commanding and they are having issues determining why it's happening.  FYI it was happening before the tune with Trifecta so I know it's not that. 

Well, they were stumped until I told them that after I got the P0107 code with my MAP sensor the hesitation went away.  They think it's related to the MAP sensor (even though it wasn't throwing a code prior). 

They recommended I go with the 3-bar sensor, but I'm hesitant to spend the money if it doesn't fix the problem.  I'm already dropping $3,000 for the rear diff replacement.

[Critterman]

That diff isn't going to do anything if you can't get the engine to run right

[MattM]

That's just it!  After the check engine light it was running correctly.,