DSMboostin15
15+ Year Contributor
- 502
- 6
- Sep 1, 2005
-
Dubuque,
Iowa
I'm having trouble trying to figure out my knock issue during light acceleration.
My '91 TSI AWD is basically stock (stock MAF-unhacked with silencer removed, stock boost-BCS resrictor removed, stock injectors) except for an AFPR, 255 pump, and DSMlink run through my '90 ECU. Link is set up for stock settings (450s, 1g timing, etc) and I have new plugs gapped to 0.028".
I'm experiencing really bad knock during mild acceleration - say from a stop light and I can't figure out if it's knock or phantom knock. Link shows that I'm at 22% throttle with low IDCs - I'm not even in boost. I've done countless BLTs, but the only ones I've had were small vacuum lines that are now fixed.
I don't have my wideband installed yet - still attached to my GST, so I don't know my exact AFR, but isn't the stock map designed to run rich (9-10:1)?
I'm thinking that my cat could be clogged causing high EGTs but have yet to tear it off and inspect it.
I have verifed that timing is still at 5* and base fuel pressure is at 37psi.
Any insight as to what could be going on would be appreciated.
My '91 TSI AWD is basically stock (stock MAF-unhacked with silencer removed, stock boost-BCS resrictor removed, stock injectors) except for an AFPR, 255 pump, and DSMlink run through my '90 ECU. Link is set up for stock settings (450s, 1g timing, etc) and I have new plugs gapped to 0.028".
I'm experiencing really bad knock during mild acceleration - say from a stop light and I can't figure out if it's knock or phantom knock. Link shows that I'm at 22% throttle with low IDCs - I'm not even in boost. I've done countless BLTs, but the only ones I've had were small vacuum lines that are now fixed.
I don't have my wideband installed yet - still attached to my GST, so I don't know my exact AFR, but isn't the stock map designed to run rich (9-10:1)?
I'm thinking that my cat could be clogged causing high EGTs but have yet to tear it off and inspect it.
I have verifed that timing is still at 5* and base fuel pressure is at 37psi.
Any insight as to what could be going on would be appreciated.
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