16168625 Drowning at idle
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Joined: Feb 2003
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From: Winslow, Maine
Car: 1993 Z-71 pickup
Engine: Heavily modified 355 on TBI
Transmission: Had a 4L60e. Now a 700R4
Axle/Gears: Bone Stock
16168625 Drowning at idle
I am having a huge time trying to get my small block 350 TBI to start and idle without drowning itself in fuel. At idle the cam produces about 11" of manifold vacume which is a major cause of my rich condition.
I am at a loss of what to change within the tables where as I'm not too clear with the tables and their functions. I though I had a pretty good handle on it until I decided to disconnect the battery for longer than a chip change and apparently it lost some of it's memory which tells me I'm even further off than I had though because I could not get it to start without flooring it. Just previously I could crank it over using no pedal at all. Disconnect the battery for too long and everythings back to square one.
To correct my over fueling problem I have lowered both main fuel tables for open and closed throttle so blm is around 128.
I have changed my injector constant to 85 assuming this would help reduce fuel...Didn't seem to do anything.
Changed constant "min. map for AE at idle" table to prevent any enrichment at idle.
Changed EGR constant so that EGR is not functioning while tuning.
Raised all in table:"Open loop AFR Vs. Coolant Vs. Map"
Zero'd out the "startup AFR ratio Vs. coolant temp" table to prevent any additional fueling.
Lowered all within "crank BPW vs. coolant temp" table.
Added some timing and now I'm scratching my head because I just cant figure out what to do next.
I unplugged one of the two injectors while it was running and it's rich condition started to clear so I know it's way over fueled plus looking into the bores showed a nicely shaped cone flooding the motor. The plugs also indicate the same.
I'm totally baffled.
All the ecm and TBI components are stock to the vehicle and have not been modifiyed or adjusted other than necessary provisions done to bolt them onto an older style block.
Recently replaced plugs, cap and wires due to some minor deposit buildup inside the cap due to sitting. (it's not a daily driver yet...still in the project stage)
Please HEEEEEEEEELP I'm at a loss of what to do next...
Brandon
I am at a loss of what to change within the tables where as I'm not too clear with the tables and their functions. I though I had a pretty good handle on it until I decided to disconnect the battery for longer than a chip change and apparently it lost some of it's memory which tells me I'm even further off than I had though because I could not get it to start without flooring it. Just previously I could crank it over using no pedal at all. Disconnect the battery for too long and everythings back to square one.
To correct my over fueling problem I have lowered both main fuel tables for open and closed throttle so blm is around 128.
I have changed my injector constant to 85 assuming this would help reduce fuel...Didn't seem to do anything.
Changed constant "min. map for AE at idle" table to prevent any enrichment at idle.
Changed EGR constant so that EGR is not functioning while tuning.
Raised all in table:"Open loop AFR Vs. Coolant Vs. Map"
Zero'd out the "startup AFR ratio Vs. coolant temp" table to prevent any additional fueling.
Lowered all within "crank BPW vs. coolant temp" table.
Added some timing and now I'm scratching my head because I just cant figure out what to do next.
I unplugged one of the two injectors while it was running and it's rich condition started to clear so I know it's way over fueled plus looking into the bores showed a nicely shaped cone flooding the motor. The plugs also indicate the same.
I'm totally baffled.
All the ecm and TBI components are stock to the vehicle and have not been modifiyed or adjusted other than necessary provisions done to bolt them onto an older style block.
Recently replaced plugs, cap and wires due to some minor deposit buildup inside the cap due to sitting. (it's not a daily driver yet...still in the project stage)
Please HEEEEEEEEELP I'm at a loss of what to do next...
Brandon
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