Read everything I can on here, but not sure what to change.
Stock ZZ4 350 cid in '92 GMC short box. Sniper & HyperSpark installed.
Overall runs great except for lean (near stall condition) when I put it into gear, or decelerating and turning a corner.
IAC seems to be set correctly. Set around 8% at hot idle. TPS reads 0%.
Base Fuel Table and Base Timing Table have been inputted.
In that attached datalog, I let it warm up, then went for a short cruise on the highway, back into the neighborhood, idled on the driveway for 30 seconds ish, then put into gear to check stall condition.
You can see the issue on the attached datalogs
- 690 seconds. Cruising at 60 MPH, foot off gas, then nearly stalls when approaching the corner. RPM drops to 370, AFR to 23.5.
- 880 seconds. Stopped, and put into reverse. RPM drops from 800 to ~440 RPM. Didn't stall, but AFR goes to 18+.
Sometimes, you need to give the truck a bit of pedal to start cleanly. You can see TPS at ~20% around 8 second mark.
Really not sure what to play with here? Let me know if more information is needed to assist. Thanks.
Stock ZZ4 350 cid in '92 GMC short box. Sniper & HyperSpark installed.
Overall runs great except for lean (near stall condition) when I put it into gear, or decelerating and turning a corner.
IAC seems to be set correctly. Set around 8% at hot idle. TPS reads 0%.
Base Fuel Table and Base Timing Table have been inputted.
In that attached datalog, I let it warm up, then went for a short cruise on the highway, back into the neighborhood, idled on the driveway for 30 seconds ish, then put into gear to check stall condition.
You can see the issue on the attached datalogs
- 690 seconds. Cruising at 60 MPH, foot off gas, then nearly stalls when approaching the corner. RPM drops to 370, AFR to 23.5.
- 880 seconds. Stopped, and put into reverse. RPM drops from 800 to ~440 RPM. Didn't stall, but AFR goes to 18+.
Sometimes, you need to give the truck a bit of pedal to start cleanly. You can see TPS at ~20% around 8 second mark.
Really not sure what to play with here? Let me know if more information is needed to assist. Thanks.
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