Running rich issues out of nowhere
Thread Starter
Teching In
Joined: Dec 2009
Posts: 43
Likes: 0
From: Missouri
Running rich issues out of nowhere 2001 Camaro
408'' LQ9
F1C Procharger 4.13 pulley
Walbro 450 and 255 (Both are less than 1 month old)
-8 Feed, -6 Return that drops down to the factory line 2 feet after the regulator
A1000 1:1 referenced
SD 3 bar
My problem is, after installing the 255, I left my shop and made a pull, the car blew the midpipe off. After reinstalling the midpipe I drove the car back. After this, I started having a rich issue. Pig rich at idle, it will make your eyes water, longterm trims jumping into the 20s etc.
-I have already smoke tested the car for hours looking for vac leaks.
- New plugs
-New upstream 02s
-map sensor is good and tight in manifold
I damn near don't know what else to look for or do. I have logs from before the issue and after the issue.
The first log attached is before the problem, 2nd log shows the problem occurring.
408'' LQ9
F1C Procharger 4.13 pulley
Walbro 450 and 255 (Both are less than 1 month old)
-8 Feed, -6 Return that drops down to the factory line 2 feet after the regulator
A1000 1:1 referenced
SD 3 bar
My problem is, after installing the 255, I left my shop and made a pull, the car blew the midpipe off. After reinstalling the midpipe I drove the car back. After this, I started having a rich issue. Pig rich at idle, it will make your eyes water, longterm trims jumping into the 20s etc.
-I have already smoke tested the car for hours looking for vac leaks.
- New plugs
-New upstream 02s
-map sensor is good and tight in manifold
I damn near don't know what else to look for or do. I have logs from before the issue and after the issue.
The first log attached is before the problem, 2nd log shows the problem occurring.
What is with all the fuel pumps? I assume that with $1000 in a fuel system you must have $10k+ in the engine and so obviously you own a $97 fuel pressure gauge and have verified that the pressure at the rail is not overpowering the regulator (What with 3 fuel pumps). I also assume you arn't just blowing the cash without doing any research and are running only a single pump at a time, and adding more as boost comes in (boost activated fuel system). Next, Ill assume since you have 160lb injectors you also have a stand-alone, which means you can adjust how rich and lean you want the engine manually... thus begging the question of posting here online... ? If its runnin' rich you inspect the laptop screen for clues, and then tune the engine how you want it. Next...
Prob need more answers to some questions, lol
Not sure what your calling mid pipe, but a map sensor will throw off the fuel table, I went thru that with my Holley HP, fouled plugs, but I used the CL comp. to save the next set. You don't have a very big return, so the pumps could have overloaded the reg, but I guess you mont. the fuel pres.
You may need a retune-how does the map sensor read with ign on, engine off
Not sure what your calling mid pipe, but a map sensor will throw off the fuel table, I went thru that with my Holley HP, fouled plugs, but I used the CL comp. to save the next set. You don't have a very big return, so the pumps could have overloaded the reg, but I guess you mont. the fuel pres.
You may need a retune-how does the map sensor read with ign on, engine off
Thread Starter
Teching In
Joined: Dec 2009
Posts: 43
Likes: 0
From: Missouri
[QUOTE=kingtal0n;19396484]What is with all the fuel pumps? I assume that with $1000 in a fuel system you must have $10k+ in the engine and so obviously you own a $97 fuel pressure gauge and have verified that the pressure at the rail is not overpowering the regulator (What with 3 fuel pumps). I also assume you arn't just blowing the cash without doing any research and are running only a single pump at a time, and adding more as boost comes in (boost activated fuel system). Next, Ill assume since you have 160lb injectors you also have a stand-alone, which means you can adjust how rich and lean you want the engine manually... thus begging the question of posting here online... ? If its runnin' rich you inspect the laptop screen for clues, and then tune the engine how you want it. Next...[/QUOTE
I'm not sure what you mean by "all the fuel pumps", I have two fuel pumps in the tank, a walbro 450 and a walbro 255. Very common for cars of this caliber to have 2 pumps, the only difference is usually they're two matching pumps. Secondly I never verified pressure at the rail, I verified it at the regulator and it was always within range. I don't know why you would assume I had a stand-alone just because I'm running 160lb injectors, they are high impedance.
I'm not sure what you mean by "all the fuel pumps", I have two fuel pumps in the tank, a walbro 450 and a walbro 255. Very common for cars of this caliber to have 2 pumps, the only difference is usually they're two matching pumps. Secondly I never verified pressure at the rail, I verified it at the regulator and it was always within range. I don't know why you would assume I had a stand-alone just because I'm running 160lb injectors, they are high impedance.
Thread Starter
Teching In
Joined: Dec 2009
Posts: 43
Likes: 0
From: Missouri
Prob need more answers to some questions, lol
Not sure what your calling mid pipe, but a map sensor will throw off the fuel table, I went thru that with my Holley HP, fouled plugs, but I used the CL comp. to save the next set. You don't have a very big return, so the pumps could have overloaded the reg, but I guess you mont. the fuel pres.
You may need a retune-how does the map sensor read with ign on, engine off
Not sure what your calling mid pipe, but a map sensor will throw off the fuel table, I went thru that with my Holley HP, fouled plugs, but I used the CL comp. to save the next set. You don't have a very big return, so the pumps could have overloaded the reg, but I guess you mont. the fuel pres.
You may need a retune-how does the map sensor read with ign on, engine off
Trending Topics
I cant open the logs, do they show CL comp adding or sub. fuel
My map sensor read 100, 101 at 600' above sea level, so you are close
Sounds like something is telling it to add fuel-strange it changed after the exhaust came off
Did you do any welding on the car, I know with just a couple tack welds on mine, it courp. the tune, I had to load the backup-now I disc all the cables
(Holley HP)
I remember my old 408, had a D1SC, blow thru carb, sucker was bullet proof
While I like the FI, it doesn't take much to **** it off, lol
My map sensor read 100, 101 at 600' above sea level, so you are close
Sounds like something is telling it to add fuel-strange it changed after the exhaust came off
Did you do any welding on the car, I know with just a couple tack welds on mine, it courp. the tune, I had to load the backup-now I disc all the cables
(Holley HP)
I remember my old 408, had a D1SC, blow thru carb, sucker was bullet proof
While I like the FI, it doesn't take much to **** it off, lol
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 Thread Starter
Teching In
Joined: Dec 2009
Posts: 43
Likes: 0
From: Missouri
I cant open the logs, do they show CL comp adding or sub. fuel
My map sensor read 100, 101 at 600' above sea level, so you are close
Sounds like something is telling it to add fuel-strange it changed after the exhaust came off
Did you do any welding on the car, I know with just a couple tack welds on mine, it courp. the tune, I had to load the backup-now I disc all the cables
(Holley HP)
I remember my old 408, had a D1SC, blow thru carb, sucker was bullet proof
While I like the FI, it doesn't take much to **** it off, lol
My map sensor read 100, 101 at 600' above sea level, so you are close
Sounds like something is telling it to add fuel-strange it changed after the exhaust came off
Did you do any welding on the car, I know with just a couple tack welds on mine, it courp. the tune, I had to load the backup-now I disc all the cables
(Holley HP)
I remember my old 408, had a D1SC, blow thru carb, sucker was bullet proof
While I like the FI, it doesn't take much to **** it off, lol
I attached a picture of a good log vs a picture of adding fuel.
