This is why I asked you if the ECM is going into closed loop. It may be running ok on an open loop fuel map for first 5 minutes then warming up & going closed loop and seeing a parameter that is shutting off boost. I’m no expert at these systems; just a guess but that is an easy check with a scanner.Those are all great questions and suggestions. With only my Torque app and an OBD-II scanner, there's only so much I can look at. All sensors appear to giving normal readings at least on the surface. MAF, coolant, IAT, IAT2, manifold pressure, boost gauge, are all giving me readings that are consistent with what I'd expect to see. That doesn't mean there's not something wrong down deeper, but they look good up front.
I'm listening to every piece of advice you guys are giving me. I think I found a reputable ASE mechanic in my local area. I'm going to give them a call on Monday see if they would be willing to work on it and if they can do something like boost/vacuum leak tests using smoke, pressure or whatever.
Whatever the issue is, it's very consistent. The boost will just suddenly disappear without any warning after about a 5-10 mile drive. This is after clearing the codes before the drive. What I thought was odd, and thank you for clearing that up, is when I get back home, there may or may not be any codes that are set in stone to trigger the CEL. The pending codes and even the ones that are not pending are very consistent with P0036, P0449, P0452, and P0101. And maybe a P2178 code every now and then.
Agreed. None of us are running the second O2, no problems.The only other consistent code I get that could cause an issue is the P0036 which is the post-cat O2 sensor. From my understanding, that sensor isn't really used for anything other than cat health.
I'm assuming builders in non-emission caring states are just simply leaving that sensor unplugged and not running any kind of simulator or anything like that.
That's the first thing that crossed my mind also when he said it was consistent at 5-10 miles. This could be proven by taking taking it for another trip immediately after again with the engine warm and it should do it right off the bat. Doesn't help a lot but does prove that it's a closed loop issue.This is why I asked you if the ECM is going into closed loop. It may be running ok on an open loop fuel map for first 5 minutes then warming up & going closed loop and seeing a parameter that is shutting off boost. I’m no expert at these systems; just a guess but that is an easy check with a scanner.
Yes. It just monitors cat efficiency and serves as a tattletale to the emmissions inspector when the cat fails.The only other consistent code I get that could cause an issue is the P0036 which is the post-cat O2 sensor. From my understanding, that sensor isn't really used for anything other than cat health.
I'm assuming builders in non-emission caring states are just simply leaving that sensor unplugged and not running any kind of simulator or anything like that.
Any scanner should indicate closed or open loop. If the issue is happening once it hits closed loop, then its due to a parameter that is monitored in closed loop. (If the car is running fine in open loop under fixed parameters then the ECM is seeing no major failures.) Still not an immediate answer, but certainly a means to narrow down. A common misconception is that there are always codes thrown when something goes wrong. Not the case at all. There are always codes when it is emission- related equipment or emission equipment monitoring failure. Otherwise its due to sensor signals that are either at extreme reference ranges or providing no return reference signal at all.That's the first thing that crossed my mind also when he said it was consistent at 5-10 miles. This could be proven by taking taking it for another trip immediately after again with the engine warm and it should do it right off the bat. Doesn't help a lot but does prove that it's a closed loop issue.