Well I just got off the phone with the dealership and they asked if I ever had the MAP sensor replaced, and I told them I had the GMS1 installed. They told me that it was suppose to be a 4 pin and the one I have in it now is a 3 pin, that is what is causing my misfires. So I asked if that was covered under warranty and they said it wouldn't, but so I told him, because this is a new dealership that I'm trying out, it was all installed by GM. So he said let me get back to the tech and he'd give me call.

Anyone know what this is about? 4 pin vs 3 pin MAP sensor?

 

The OEM MAP is 3-pin. The 3bar MAP for the GMS1 is 4-pin, but you don't use pin#2. The original TMAP is a 4-pin. Does your GMS1 MAP sensor have the blue/silver sticker on it?

 

So who f'd up? The dealership that installed it or the new dealership that is trying to figure out the cause of the misfiring?

 

Sorry, I edited my post. Do you have th silver/blue sticker on your new MAP sensor that's on your manifold now?

To clarify: we are talking about the sensor on your intake manifold at the top, right? Not the TMAP that's on the coldside pipe. From what I understand from the install instructions for the turbo upgrade kit, your OEM sensors are a 3-pin MAP in the intake manifold and a 4-pin TMAP on the coldside pipe. The turbo upgrade kit comes with two TMAP sensors. The reason pin #2 isn't used on the manifold sensor is because the temperature feedback is not used.

Actually, unplug the sensor you are talking about and take a pic of the pins and post it. That'll let us know for sure. Either way, whomever installed this kit is responsible for making it right.

 

He said yes, he believed it did.

 

The dealer doesn't know what is causing the misfire. It sounds like they immediately went looking for non OEM parts to blame, figures *rolls eyes*.

 

You'll just have to get in touch with the dealership that installed it and get them to make it right. There's something fishy going on, or the dealership that currently has your car doesn't know what the hell they're doing.

 

The stg kit map sensors are correct and have nothing to do with the misfires. They are just being too damn lazy to do some actual diagnostics.

 

So, I talked to the tech himself. He told me there were 3 codes, none were misfires, MAF Performance, MAP Sensor, and something about at cruise and deceleration.

I called my other dealership to tell them what was going on and he said "WHAT?" LOL It was kind of funny. They did blame the oil from the K&N for the MAF code, which cracks me up because I never reoiled it since I've had it and it's almost been a year. Still has the same stuff that came from the factory. Anyway... that was that and the whole MAP sensor issue is hopefully going to be settled with them. I had the guy at Tawas dealership call the one that my car is currently at to let them know that it was all installed by them. They also asked me about the power steering recall and they are doing that for me when they get the part, because there IS an open recall which suppose the Tawas Dealership doesn't realize, which seems like one dealership knows more than the other but then they do something stupid and makes me second guess myself on that... The GM tech support is not at the office today, so they can't get the support they need.

Funny thing about the MAF code even though it is coming up for them, my fuel readings he said were 0% and I've been getting some of the best MPG since I put the GMS1 on and the drop-in filter. So... I guess I go back to stock with that and put it up for sale?

I still don't understand the whole wrong pin issue. They probably will install the STOCK pin and mess the whole thing up, but I sure hope not. Any other comments on this issue?

 

There is no "stock pin." You have a "stock MAP sensor" in the intake manifold that has 3 pins, and you have a "stock TMAP sensor" in the manifold when you install the "GMS1" sensors that has 4 pins. The "GMS1" TMAP sensors (one in the intake and one in the coldside pipe) will only work correctly with the "GMS1" flashed program. If the OEM 3-pin MAP and 4-pin TMAP sensors were still in your car with the "GMS1" program, it would run like crap and you would need to bitch at Tawas about charging you for something they didn't do. The "GMS1" sensors have a blue and silver sticker on them and the OEM sensors do not. That's the easiest way to tell. It is not as easy as switching the sensors out, either, because they had to hack up your factory wiring harness to put the new "GMS1" sensors in. All of your issues are probably coming from the splice-job for one of those sensors. Just do a search for "GMS1" and you'll find all kinds of people having issues with it.

 

Haha, didn't even realize I put stock pin, I meant stock sensor... Either way, you caught onto that. Thanks for the info. Hopefully it gets straighten out. They have my car for a few days, in the meantime I'll work on my retrofit project. They are calling me tomorrow, Monday, for updates, and keeping the car until Tuesday for the power steering recall because that's when they get the part. They will need to find another reason for why the MAP sensor keeps going. I have to get my old air filter put back in because I didn't realize they would blame something as simple as a drop in air filter from K&N for a code that is only being brought up by the TECH II and not on the dash.

 

What is the exact problem you are having. I took my car in because it would not boost past 9 psi and it was not driving right. I suspected there was a boost leak but dealership would not listen. The dealership went on to replace one map sensor, then they blaimed my k & n drop in that I had on the car but still replaced the maf without charge, then they replaced an 02 sensor before they went on the phone with gm and figured out I had a crack on my passenger side intercooler end cap.

 

I have 3 codes, MAF code and MAP code and some other due to the MAP sensor. They said it was the wrong MAP sensor and they found out, I was right, it was the right MAP sensor. They said to take out the K&N filter and put in the stock so they have somewhere to go... BUT that still doesn't give reasons to the MAP sensor. I have had a few problems with boosting but it always returns to normal within a day. It just keeps jerking at random times. For examples, I'll be cruising at 75 mph and all of a sudden the car jerks, almost like when you are about to stall and drops 100-300 rpm's. and it will return to normal, but keeps doing that. So if I'm doing about 2800-3k @ 75 it will drop down to 2600-2800. then return to 2800-3k. Pisses me off, but neither dealership can seem to find the problem, or they aren't trying.

So this trip to the dealership is to replace to drop-in with the stock filter and then wait until the code pops again so I can say, NOPE it wasn't that!

 

It's probably just incorrectly installed sensors. It's a common theme.

 

Well, I got the car today, and like I said, they replaced the air filter back to stock and now I have to wait until the car does it again.