I tried searching but couldn't come up with anything.

I installed a Spin ported intake/TB last night, and everything was fine. Took it for a test drive for about 20min and it felt awesome. When I got to work today, the engine light came on for P0170, system too lean bank 1, at a stoplight.

So I figured I messed up one of the gaskets on the manifold, so I pull it apart and sure enough, one of them was sitting on the head, but it was on the passenger side. The code states for bank 1, which would be the driver side correct? After cleaning them all I stuck them in there real good, put the manifold back on and reset the battery.

I drive home about 30 miles or so, get some gas, then pull into the garage. While sitting there on my phone, idling, the light pops back on and it's the same one.

I take a can of brake clean and go to town all along the manifold, the vararam, all the vacuum lines I disconnected and the engine didn't miss a beat. Before I go back tearing down the manifold again, anyone have any ideas?

I figured I might have to get a retune to fix all of this.

The car runs fine, still pulls hard and everything, but it's happened 3 times after 3 resets and only at idle.

 

Could be with the new manifold the engine is getting a lot more air and you actually have a slightly lean mix. May need to let your favorite tuner check it out. I just installed a new FAST and planned to get a retune. Have no run time on it though so dont know what my engine will do.

Donald

 

Bet you have a vaccumn leak.

 

why would'nt you talk to spin?

 

He did and was told that cars with airlfow mods have to be tuned because seeing higher positive long term fuel trends (Not locked step up indicating a vacume leak) is normal when you get any type of airflow mod done to your car. When you add headers, ported intake manifolds, air intake assemblies and such, the long term fuel trends climb as a result of increased airflow. The car compensates up to +24% at idle and cruise and the purpose of the tune is to again center the long term fuel trends so the car is dumping additional fuel at WOT. If he was at +22% the car would still be dumping too much fuel at WOT although some mistakenly think that since they dont have a check engine light since it isnt over 24% its "OK", when it isnt. It would still need to be tuned for an intake manifold porting.

Tunes arent optional with such mods but he is entitled to hear it from other sources.

Vacume leaks cause fuel trends to climb to +50 which is the limit of the scanner and is not what he has here. If it was, the idle would be hunting and surging. His manifold is a ported stock intake and isnt leaking air.

Lastly this isnt to be confused with airflow correlation codes from hogged out TB's for which the code would be P0102, P0068 and such.

Everyone who gets a ported intake gets a tune for the changes at which time they feel the real gains from it. Without it I doubt it pulls even 1/2 of the gain. The fueling is obviously off if you dont tune....even if you dont have a check engine light. More air in requires the fuel to increase too.

 

If you have +23% LTFT's you wont get a check engine light but it will still need to be tuned. It will be 23% leaner at idle and 23% richer at WOT and its already running pig rich when you buy it. It measures the non-PE (idle and cruise) for fuel trends and then dumps that percentage extra fuel at WOT.

Here is a screen shot of a properly tuned car that was modded with headers and ported Intake/TB at idle:

An untuned car would be in the red like this where you see LTFT's:


A car can hug the line and when you idle, it will hit +20 to +25% (they jump around) and trigger a check engine light for the +24% being hit. A car with a vacume leak would be +50 in all 4 columns and have an irratic idle. If this car never hits =24% it wont trigger a CEL but it very much does need a tune. Its an FI car and was running 10.6:1 a/f ratio at WOT. I wasnt ok even though it didnt trigger a CEL.

Same car as screen shot two but tuned at that load and speed:

 

Nothing is done wrong and before you waste your time looking for something wrong, call another tuner if you dont believe me and he will verify the same thing you heard from me. Its doing exactly what every other car does when you add an airflow mod.

You say you knew you might have to get a tune.... everyone who gets a ported intake needs a tune no matter what. Contact me if you need any additional help.

 

Spin,

Definitely not doubting you or your experience, you actually show proof.

I made this thread after I sent him a PM, but I'm sure he gets a million PMs a day about this stuff and didn't want to really bother him so I figured I might get the answer from others who had similar experience.

If it sounded like I was bashing, I definitely was not. Hell I thought I was missing something and it was install error.

The port job came out spectacular. One of the LS motor guys that builds motors stopped by and he instantly said "wow this is a good port job" he was highly impressed and said he'd send some customers over Spin's way.

 

more air in-more air out =tune