Reply to thread

Message: [QUOTE="MAFoElffen, post: 955573, member: 14847"] Yes, unplugging the MAP would throw that into a default fuel map... I would think boost leaks would not cause that, because the MAP would read lower, right? Bad MAP sensor could cause that. Reason I say that? Well- I'm OBS, running tunes and consistently max out with 25.6 pounds boost without getting decel conditions and without having to use a MAP line regulator. In fact, that is where a friend and I have figured is the point where it would be safe to set a MAP regulator if you needed one. Me and a friend tested this condition with the MAP. He goes above 40 psi. He has a regulator setup. I am planning to go 40 PSI. We both have a vested interest. The external MAP sensor actually registers to just above 30 psig in varying the sense voltages, sending them to the PCM. (Yes, we thought that MAP reading limit would have been max'ed at a lower pressure, but we were wrong...) The PCM seems to trip a decel condition at around 27-28 pounds psig. (note that is all corrected to "psig") So if the OP is really getting a decel condition... verified by an overboost DTC P0234 or for some reason was getting an underboost DTC P0299 code with good boost on the gauge... = Bad MAP sensor. You have a manual Boost gauge right? And you are 20-25psi with stock tunes? With what Turbo and wheel? That is not noted in the sig line your are posting with... and you are not going to get that on a "stock" tune calibration with a stock TP-38 turbo... that would be very rare. I'm getting that with a TP-38, but with many heavy mod's to that. (just confused by that logic) Do you have he ability to read live data? On the suggestion of tunes or removing the Chip... Do you have a chip (and if so who's tunes for what?) I didn't see where you confirmed that you had a chip or not. That was confusing. You said you were still on stock tunes and was waiting on working out some turbo related issues before going to tunes. 160's will run without a chip... just not as well. But may be you meant that you are running tunes chipped for stock injector'ed calibrations... so that maybe the tuned calibrations for those are opening the larger injectors up too much? If so you would have black smoke from the A/F being off, right? You also did not go into any details on the turbo related issues you said you were working through... Just thinking out loud. [/QUOTE]