LS1TECH - Camaro and Firebird Forum Discussion

PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

MAF heatsoak cause bad reading?

Thread Tools
 
Search this Thread
 
Old Aug 1, 2022 | 06:22 PM
Share
  #1  
HappySalesman's Avatar
HappySalesman
Thread Starter
TECH Fanatic
10 Year Member
Photogenic
Photoriffic
Liked
iTrader: (3)
 
Joined: Jun 2014
Posts: 1,241
Likes: 47
From: Noblesville, IN
Default MAF heatsoak cause bad reading?
I was driving my Camaro to work this morning and got stuck in some pretty heavy traffic. I'm in the middle of trying to get my MAF curve correct, so my tune is setup to read only from the MAF. I noticed after about 25 minutes of stop-and-go, that my low rpm/idle AFR readings were suddenly in the mid 15's, as opposed to roughly around 14.7 where it had been. I'm using a card-style MAF in a TSP housing, which is made of aluminum. Is it possible that the MAF housing got hot and was sending inaccurate information to the PCM?
Reply
0
Old Aug 2, 2022 | 09:03 AM
Share
  #2  
Darth_V8r's Avatar
Darth_V8r
Moderator
10 Year Member
Liked
Loved
Community Favorite
iTrader: (4)
 
Joined: Jul 2014
Posts: 10,450
Likes: 1,873
From: My own internal universe
Default
Yes this legit happens.

F body IAT sensor mounted way away from radiator is the fix.
Reply
1
Old Aug 2, 2022 | 01:47 PM
Share
  #3  
HappySalesman's Avatar
HappySalesman
Thread Starter
TECH Fanatic
10 Year Member
Photogenic
Photoriffic
Liked
iTrader: (3)
 
Joined: Jun 2014
Posts: 1,241
Likes: 47
From: Noblesville, IN
Default
Originally Posted by Darth_V8r
Yes this legit happens.

F body IAT sensor mounted way away from radiator is the fix.
The IAT is built into the MAF on mine. So it's located just at the end of the air filter housing. Don't think I could relocate it anywhere honestly. Might be time to go SD lol.
Reply
0
Old Aug 2, 2022 | 02:41 PM
Share
  #4  
Darth_V8r's Avatar
Darth_V8r
Moderator
10 Year Member
Liked
Loved
Community Favorite
iTrader: (4)
 
Joined: Jul 2014
Posts: 10,450
Likes: 1,873
From: My own internal universe
Default
Originally Posted by HappySalesman
The IAT is built into the MAF on mine. So it's located just at the end of the air filter housing. Don't think I could relocate it anywhere honestly. Might be time to go SD lol.
I extended the wires on mine so I could move it forward. My wife's vette has /had a 5 wire maf with integrated iat. Spliced harness and a couple feet of wire later, remote IAT.

You will have the same issue SD unless you move the sensor away from the radiator
Reply
0
Old Aug 2, 2022 | 07:55 PM
Share
  #5  
RonSSNova's Avatar
RonSSNova
8 Second Club
10 Year Member
Photogenic
Photoriffic
Top Answer: 1
iTrader: (3)
 
Joined: Aug 2011
Posts: 4,732
Likes: 815
From: Portland, OR
Default
The IAT sensor in the card maf needs different calibration numbers in the tune than the stock IAT, or the round maf IAT.

Has that been done? I’m assuming you have a stock ecu.
Reply
0
Old Aug 3, 2022 | 01:35 PM
Share
  #6  
HappySalesman's Avatar
HappySalesman
Thread Starter
TECH Fanatic
10 Year Member
Photogenic
Photoriffic
Liked
iTrader: (3)
 
Joined: Jun 2014
Posts: 1,241
Likes: 47
From: Noblesville, IN
Default
Originally Posted by RonSSNova
The IAT sensor in the card maf needs different calibration numbers in the tune than the stock IAT, or the round maf IAT.

Has that been done? I’m assuming you have a stock ecu.
No it hasn't. I'm still running the stock ECU, however the data I've seen in the scanner for IAT looks pretty normal. How do I recalibrate it?
Reply
0
Old Aug 4, 2022 | 08:59 PM
Share
  #7  
RonSSNova's Avatar
RonSSNova
8 Second Club
10 Year Member
Photogenic
Photoriffic
Top Answer: 1
iTrader: (3)
 
Joined: Aug 2011
Posts: 4,732
Likes: 815
From: Portland, OR
Default
You would need hp tuners, or EFI live.
Do you have tuning software?
Reply
0

Trending Topics

Old Aug 6, 2022 | 10:05 AM
Share
  #8  
HappySalesman's Avatar
HappySalesman
Thread Starter
TECH Fanatic
10 Year Member
Photogenic
Photoriffic
Liked
iTrader: (3)
 
Joined: Jun 2014
Posts: 1,241
Likes: 47
From: Noblesville, IN
Default
Originally Posted by RonSSNova
You would need hp tuners, or EFI live.
Do you have tuning software?
Yup. Hptuners. I just don't remember seeing anything in there about the iat calibration
Reply
0
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-4

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-5

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
Back to Subforum
PCM Diagnostics & Tuning
View Next Unread
Tech 2 clone / AC troubleshooting




Advanced Search

All times are GMT -5. The time now is 01:56 AM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-4
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-5
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-6
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-7
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-8
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-9
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE