Quote:
quote:Originally posted by PETEY_CRUISER
while this would normaly bog down a car the controler is making it easyer to spool the turbo forcing air to push in to the cylinders with out ample spark retard. this is why they make electronic ignition systmes for NOS and Turbo car with Retard adjustment. This in turn is read at the Tip to much air for fuel and spark and confuses the ECU triping a code. In closing thoughts I think this is why it is happing to 5 speeds more often than the Auto sticks because the auto will down shift ....
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I think there is a lot of merit to this approach. However, the TIP can't sense the A/F ratio. That is determined downstream, by one O2 sensor in the exhaust manifold, and a second one in the Cat. Having said that, it is entirely possible that the O2 sensor(s) are reporting the condition that you describe to the PCM, and it is adjusting performance accordingly.
I believe that the TIP's job is to monitor the boost pressure and report back to the PCM on the PCM's steps to keep boost pressure under it's own control. When the PCM tells the Wastegate to vent, and the MBC has stopped pressure at 10 pounds, the TIP reports back to the PCM that the TIP has failed. Due to the complexities of the Task Manager and the error reporting process, the p1188 error may pop up at any time. The error trapping routines use "fuzzy logic" and the MBC makes it even fuzzier to the PCM...
Again, this is theory. If I can get some better info on the PCM programming than my Service Manual has, maybe I can get a better understanding of what is happening. If anyone has a service manual or emmision supplement that gives a block diagram or a flow chart for the PCM, I would like to get a scan of those pages only, if possible. My service manual seems to be a early release, and at 2078 pages it still leaves a lot of systems undocumented.