so ive read through every possible p0101 maf thread and can not seem to find my answer. i have an 09 ss/tc with injen intake, 3in catless dp & exhaust, gms1 sensors, charpe pipes & dejon spring. dub tuned with hpt.

so my car boosts great until after about 2 mins of cruising. then goes into SD mode until i restart the car. then same thing again. car also boosts fine if it is under WOT. only goes into SD mode when i get to a cruising.

computer is pulling a p0101 & p0033. i have cleaned the maf, took the boost solenoid off for closer inspection, and i installed the gms1 maps myself and yes i soldered them. car ran great for 1.5 years with the gms1 sensors. everything i checked seems ok. all of this seemed like it came with this heat, before it got super hot it was fine....

yes still on stock intercooler and realize that this issue could be caused by a cracked endtank. but to my understanding i assumed if it was the endtank then it would never boost. only thing i have left to do is boost leak test it or smoke it. which i will be doing tomorrow.

but i would like to see if anyone else has any input before i do this. or if anyone has a little more knowledge on speed density mode and maf tuning.

this car really sucks when its in speed density mode, lol. pretty sure a geo got me at a stoplight. ha

 

Thats a terrible assumption.

 

not sure if I have seen many guys with P0033 before on the LNF.

Turbocharger bypass valve?

Can you do a pressure test on the system?

 

i know its a terrible assumption. lol i need an ic anyways so this would just be a way for me to HAVE to buy one.

and yeah, i plan on doing a pressure test tomorrow. im gonna replaced the maf today and see if that changes anything by chance.

and im pretty sure the turbo bypass solenoid code is being cause by the maf code.

 

I would check the I/C first and do a pressure tests, for past week it seems that stock I/Cs are just taking a crap on everyone, maybe a good time for a group buy? Lol

 

well replaced the maf sensor and did a few 2nd-3rd pulls. did great. full boost. then once i got to cruising it went into sd mode again.

hopefully boost leak test will show me a cracked ic.

 

I actually just started having this problem as well. I'm not sure what you mean by SD mode, but mine bucks like crazy as if it's misfiring and then it threw the P0101 code. I'm worried about my end tanks as well. I hit my IC coming out of a driveway last weekend. Once of the end tanks has a pretty big chunk of plastic taken out of it from scraping so I'm concerned it might be cracked. I'm going to do a leak test this weekend and see. Maybe next week we'll both be able to provide some more insight on this issue.

 

sd = speed density mode or aka limp mode. but i hope i can figure this out. and i wanted zzps ic but they will be out of stock til september. so looks like ill be going with mpx

and im almost positive this issue is heat related. this happened to me 2 years ago 8 month after i bought the car in the middle of the summer.

 

well boost leak test found a leak but not on ic. fixed that then held 25 psi for 10 mins. drove it and still same thing.

could the boost solenoid be bad?

 

ZZP is out till September??? I've been trying to get an answer from them over the last few days bc I've also just gone through the same problems.. I was sure it was cracked IC (stock ic) so while making the boost leak tester buddy was removing bumper and sure enough nice long hairline crack.. Want ZZP but they told you September I might just order different one now.. What you guys think best substitution?

 

was your boost good until you cruised for a min or did you not have any boost at all?

imho its mpx

 

Was it right about here?

 

does a cracked ic really cause a maf code?

 

crack was passanger side but high. From right to left of the upper bracket hole u see

 

Too be honest any of them lol. They all do the same thing so its basically the look your goin for and the price you wanna pay.

I like the treadstone, people complain they dont like seeing the cast endtanks through the grill. I think it looks good.

 

Yes, because of all the unmetered air being sucked in on the other side of the MAF.

 

thanks for all of the responses. i had to go with another stock ic from a member of cobalt nation. just cant quite afford after market yet. ill update once the new one is on.

 

You're going to want to re-log and very carefully look at those logs. I'll just say that very bad things have happened to folks with similar tunes.

 

well replaced the ic. holds boost now. cuts out right before full boost. but upon cruising it goes right back to speed density. no MIL this time but still has maf code.

any thoughts?

and the tune was perfect before this, i always was logging and between my self and dub everything looked great prior to this

 

subd

 

Did you do a leak test after you installed the IC?

 

yeah, i just did that this morning. cleaned both map sensors, didnt appear to be any residue prior to cleaning them. both pipes and IM were clean.

took it out after all that and 3rd gear pull holds 26psi great. did a few pulls and was good. but once again i start just cruising the speed limit and it just looses everything to 3psi. it feels like the throttle restricts me to a certain percent. its limp mode without really being limp mode.

only codes i have are p0101 and p0033. the p0033 i know why i have it due to vacuum tank delete and deleted the boost solenoid. been that way for 2 years now and never had a problem. maf is brand new and still getting the p0101

another thing to add, when i replaced my ic the evap tank on the bottom had a good amount of water. the new one was dry when i installed. appeared dry still this morning when i had the pipes off

im just so lost, im a pretty damn good mechanic, but when it comes to computer stuff im sooooo lost lol.

 

Could it be possible that your connector plugging into your MAF is bad? Maybe if the MAF harness isn't expensive you could give it a shot, but I'm guessing that it probably is expensive. My GMS1 pigtail connector cost me $100.

 

Its your Tune!!

 

Im kinda surprised, the Kappa LNFs had all aluminum front mounts, they cheaped out on you guys...well I shouldnt be surprised...