Stalling Issue LQ4
Thread Starter
On The Tree
Joined: May 2014
Posts: 109
Likes: 1
Stalling Issue LQ4 Hi folks.
2004 LQ4
Torquer V2 Cam 112 LSA, .598 lift iirc
42 Lbs Injectors
Lingenfelter MAF
100mm Throttle Body
Flipped Truck Intake
Stock Bottom End
Reputable Mail Order Tuned
Runs Mint. Starts up perfect. The motor stalls or nearly does when I get on the throttle and then back right off. Driving slow (which is what this thing will do most of the time) It does not like to idle. Stalls frequently, unless I apply the brakes to keep the rpms up and speed slow.
I have somebody who said they can come and tune it, but I am wondering if it is something worth trying to tackle myself? I would love to get into tuning as I plan to build more, but would like this thing ready for Spring
Any help would be greatly appreciated. It will have been three years building this come April and my last two issues are the only things I did not do myself....opposite of what I was expecting hahaha.
2004 LQ4
Torquer V2 Cam 112 LSA, .598 lift iirc
42 Lbs Injectors
Lingenfelter MAF
100mm Throttle Body
Flipped Truck Intake
Stock Bottom End
Reputable Mail Order Tuned
Runs Mint. Starts up perfect. The motor stalls or nearly does when I get on the throttle and then back right off. Driving slow (which is what this thing will do most of the time) It does not like to idle. Stalls frequently, unless I apply the brakes to keep the rpms up and speed slow.
I have somebody who said they can come and tune it, but I am wondering if it is something worth trying to tackle myself? I would love to get into tuning as I plan to build more, but would like this thing ready for Spring
Any help would be greatly appreciated. It will have been three years building this come April and my last two issues are the only things I did not do myself....opposite of what I was expecting hahaha.
Last edited by Won-Ton; Mar 1, 2016 at 10:23 AM.
I had an issue like that once, the car would idle fine but when you gave it gas it would stall, turned out to be the maf, hope that is whats wrong with yours, Now another thing, I dont know the frequency of the Lingenfelter maf, if its different then you would need a dump file, just like when people switch to the Z06 maf, I have to install a dump file then proceed to modify it...
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
Thread Starter
On The Tree
Joined: May 2014
Posts: 109
Likes: 1
Thread Starter
On The Tree
Joined: May 2014
Posts: 109
Likes: 1
Ok finally got to work on this thing again.
MAF is 12579352
I start it up and it runs fine. Pre warmed up I unplug the MAF not DTC, but I can easily tell a difference in how it runs, not bad...but a difference. I jump the gas, it doesnt stall in either MAF or unplugged MAF.
When warmed up with MAF plugged in and I jump on it, it stumbles...warmer it gets the more it wants to stall. Warmed up and unplug the MAF and it either stalls right out or stumbles really bad and idles very poorly at a low rpm.
A thing to note as well, it likes starting and idling less when warmed up.
Also when I unplug the MAF at any point it throws no code immediately. Next restart I get a pending 0101, a confirmed 0101 and a 0102.
MAF is 12579352
I start it up and it runs fine. Pre warmed up I unplug the MAF not DTC, but I can easily tell a difference in how it runs, not bad...but a difference. I jump the gas, it doesnt stall in either MAF or unplugged MAF.
When warmed up with MAF plugged in and I jump on it, it stumbles...warmer it gets the more it wants to stall. Warmed up and unplug the MAF and it either stalls right out or stumbles really bad and idles very poorly at a low rpm.
A thing to note as well, it likes starting and idling less when warmed up.
Also when I unplug the MAF at any point it throws no code immediately. Next restart I get a pending 0101, a confirmed 0101 and a 0102.
You're MAF diagnostic codes are set to trigger the check engine light after 1 key cycle. That is a good setting for the MAF codes.
It simply sounds like your fuel tune is off. You need to disable MAF and all other contributors to AFR and then work on the VE table. Get it dialed in so you have small, positive fuel trims and then re-enable your MAF and tune the MAF table. It's time to just go back & basically start from scratch on that tune.
It simply sounds like your fuel tune is off. You need to disable MAF and all other contributors to AFR and then work on the VE table. Get it dialed in so you have small, positive fuel trims and then re-enable your MAF and tune the MAF table. It's time to just go back & basically start from scratch on that tune.
Do you have a honeycomb mesh on the MAF? The 100mm MAFs don't like jumpy airflow. I suggest getting a honeycomb from SaxonPC (My TSP has one installed) and it runs great with the MAF. Tune the VE table first by setting the MAF to 1 or 0 (Or unplug).