1994-2002 [Subscribe to Daily Digest] |
1999 9-3 (T5) with about 175K miles. I have been getting mid yellow base boost for a while now & no CELs. Engine otherwise seems to run fine, (maybe a little rough at idle sometimes… but hey it has 175K on it). First manifested itself by only going to mid yellow, but occasionally when at mid yellow under hard acceleration it would “pop†(like someone flipped a switch or kicked you in the back) & instantly give full boost. Since problem first arose I have:
Cleaned AIC
Replaced vacuum hoses including to EVAP valve (needed it anyway)
Replaced EVAP valve (it was bad)
Replaced DIC (original one went bad)
Replaced intermediate exhaust pipe (rusted)
Replaced muffler (needed it)
Replaced & re-gapped NGK plugs (needed it)
Check/tested the BPV, PCV check valve & all hoses.
Replaced BPC (see below)
Thinking it was the BPC I bought a used one. That one was bad the other direction as wouldn’t limit boost & could take it into the red & hit fuel cut off, (so I am assuming there is nothing wrong with the turbo, wastegate, intercooler, etc, that would otherwise cause the system not to create or hold boost/pressure). The day I drove with the over boost BPC, (very careful accelerating), it seemed I got slightly better mileage (1 or 2 mpg) on the SID, (may be nothing). Guy replaced bad one with another one, and still mid-yellow, & I’ve tried another used one with same mid-yellow results. Could it be a bad MAP sensor? Could the MAP be bad or have issues without throwing a code, (I believe there are 4 MAP codes)? Anyway to test the MAP besides getting a new/used one (I don’t have a Tech II)? Is there anything else I am missing?
posted by 198.179.14...
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