Stock aside from K&N drop in. Could this be the culprit?

 

+3 sounds like its in the normal ballpark range.

LTFT does not change quickly be cause its readings are like an average of 40 something drive cycles of the STFT.

Not changing is a good thing, Id be more worried if I saw my LTFT jumping around like my STFT.

 

Yeah I didn't think it would change very often. Yesterday it dropped to 1.6 and this morning to 0.8 and my afr is between 14.5 and 15.7 so I guess everything is checking out. I just thought something was out of whack. Glad everything seems to be ok.

 

My AFR seems to be moving from 13ish to 16ish at Idle. I wonder if this valve is my culprit then.

 

It could be. bad purge valve causes knock randomly as well. Just found that out tuning a solstice and having it knock on normal timing for 91 octane LOL.

 

sigh. Im so sick of this car. Everything just seems to go wrong.

 

Just delete the purge vavle, or replace it, its only 20ish at oreilys

 

yeah. but I've already replaced it once.

 

Could be the vent solenoid but I still think you have a slight boost leak there somewhere which would cause the A/F to be off from where it was.

 

I cant count how many times I've done boost leak tests. I guess I'll do another one.

 

How long do you keep it under pressure? If its a slow leak might want to pressurize it then go drink a few beers and see if its dropped

 

Not sure what else it could be the logs seem normal and the car is commanding 250 kpa but hitting only 220 kpa at most. Everything was fine until after you put that lower charge pipe on and it was leaking. Did you end up putting the stocker back on?

 

Yeah i sent that pipe back. Its been on the stock one for a few months now.

I hit 24 lbs a few times on Sunday when i tested it. I took my Forge BPV off and put the stock one on and it still didnt hit 24 psi. put the forge back on and did a pull and it held with no knock.

 

Boost seen can vary at bit but at your altitude 24 psi is 247 kpa. That last log you sent your car was barely getting up to 220 kpa max. Send me another log when you have a chance.

 

So i wanted to updte this thrad a bit and get a little more advise. The thread is a few months old. But none the less. The cold start issue I was able to fix fairly eassily. It turned out that the vent valve in the canister was bad. And causing my car to stall when it first started up. Now the second part ( my ltft's ) is where I am looking for a bit of advise. Origanlly Term had said that based on my ltft's he figured I had a boost leak. So I built myself a boost leak tester .
And Surprize !! Term was as always right ! Both my gms1 sensors where installed by my wicked chevy dealer with the incorrect ( Green O-rings ) on them. So I ordered a few proper new seals and and sensors from Tom at CED. Great guy to deal with. And very healpful. So I replaced the sensors and seals. Re-set the ecu by disconecting the battery for an hour or two. That was about a month and a half ago. This weekend I checked for anymore boost leaks with soapy water around all conections. I re-tightened all my clamps. A few of them seemed to be coming loose ? But I didn't have any leaks that OI could see or hear. I checked my ltft using my phone and torque. After about a month my ltft seems to be at -6.2 % . Is that with an acceptable number ? Because I dont see any more boost leaks. Or hear any. Other then the very small amount of air you can hear swirling around inside the cylinder if you take your oil cap off and listen to inside the motor. Also , when I re-set the trims by disconecting the battery. I removed my kn sri and re-installed my stock factory air box. So the -6.2% is stock other then gms1. Of course it is cold out this time of year. But how much does that affect the ltft ?

 

GMS1 for me would hover between -1 and +1%. With K&N SRI I see an average of +5 to +9%

 

Well thats kinda of what I'm asking. I am on the stock air box now. After a month a and a half of driving. My ltft is -6.2%. And I don't appear to have any boost leaks. Or if i do they are very hard to find. What else could sway my ltft ? Or is a -6.2% not really that bad ?

 

It's really not that bad. What gas are you putting in? You could always shift it a bit if you are using lower octane. 93/94 will shift it up. I also use e85 to shift it up a bit too. About a gallon of e85 shifts it up 5% or so.

 

another boost leak location that alot people my miss is the breakbooster. spray around the connection on the head. As for that fuel trim. Id find that perfectly acceptable