This isn't a Hondata issue, but I'm hoping the attached Hondata datalog helps diagnose my problem:
The car has a big choke/stutter after it coasts down in gear and I try to open the throttle. If I disengage the clutch, it "clears" with a rev, and it never stalls, but the choke is really violent. Even if I'm steady cruising on the freeway, if I lift and then get back into the throttle, it will choke.
Chokes on the datalog:
9.7s
26.7s
55.9s
Why would the injectors go to zero while the engine is running? What could be causing this? I don't see a correlation between any of the sensor values and the choke, except it seems like high manifold vacuum (over -24.8"/psi) might have something to do with it. I have the same symptoms with a stock P30 ECM.
About the car: Stock B16 with 9.5lb flywheel (Exedy.) Exhaust is all new OE components, but original-sized Civic CX (~1.5") New OE fuel pump, new distributor, new main fuel relay, new throttle body with new sensors, Rywire mil-spec harness.
Could the exhaust be restrictive enough to shut off the injectors?
Injectors go to zero when engine is running...
Injectors go to zero when engine is running...
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1995 Civic CX w/ B16A (SiR-II)
Thanks for the reply West.
I have not changed any values in the "TPS" button in Parameters. I'll set the Scale TPS values (they're currently at -0.14% min and 99.98% max), but I'm not sure where to begin to tune the Overrun Fuel Cutoff (MAP) values. I don't drive the car much on the street, so I'll trade some mpg and popping on deceleration for response.
How do I go about tuning the Overrun Fuel Cutoff? Just trial and error?
I have not changed any values in the "TPS" button in Parameters. I'll set the Scale TPS values (they're currently at -0.14% min and 99.98% max), but I'm not sure where to begin to tune the Overrun Fuel Cutoff (MAP) values. I don't drive the car much on the street, so I'll trade some mpg and popping on deceleration for response.
How do I go about tuning the Overrun Fuel Cutoff? Just trial and error?
1995 Civic CX w/ B16A (SiR-II)
Re: Injectors go to zero when engine is running...
It has to be tuned out. It's a simple fix. Send me your tune. i can look at it and try to help you.MB_Greg wrote:This isn't a Hondata issue, but I'm hoping the attached Hondata datalog helps diagnose my problem:
The car has a big choke/stutter after it coasts down in gear and I try to open the throttle. If I disengage the clutch, it "clears" with a rev, and it never stalls, but the choke is really violent. Even if I'm steady cruising on the freeway, if I lift and then get back into the throttle, it will choke.
Chokes on the datalog:
9.7s
26.7s
55.9s
Why would the injectors go to zero while the engine is running? What could be causing this? I don't see a correlation between any of the sensor values and the choke, except it seems like high manifold vacuum (over -24.8"/psi) might have something to do with it. I have the same symptoms with a stock P30 ECM.
About the car: Stock B16 with 9.5lb flywheel (Exedy.) Exhaust is all new OE components, but original-sized Civic CX (~1.5") New OE fuel pump, new distributor, new main fuel relay, new throttle body with new sensors, Rywire mil-spec harness.
Could the exhaust be restrictive enough to shut off the injectors?
Ok I have a couple of questions. Do you have a wideband and did you try running the car in open loop to see if you had the same problem? I would say go ahead and adjust your TPS settings in the software and then go for a drive in both closed and open loop while datalogging. Oh, and invest in a wideband O2 sensor and controller.MB_Greg wrote:Cool. Glad to hear it might be a simple fix. Thanks!