05-19-2016 | #61 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
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Re: Low RPMs bucking
Closed Loop means that the ECM is using O2 sensors as one of the inputs for calculating injector pulse width. The VE tables are the main fueling tables and then the ECM utilizes O2 sensors to modify those values. There's more to it but this is the basic operation.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
05-21-2016 | #62 |
Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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Re: Low RPMs bucking
Small update today:
Been running with the car, knocking noise seems to be GONE since I changed the spark plugs... New code showed up once today: Code 42 - Electronic Spark Control Error. |
05-25-2016 | #63 |
Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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Re: Low RPMs bucking
Exhaust leak fixed - no change at all.
Gonna order two new o2 sensors. |
05-31-2016 | #64 |
Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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Re: Low RPMs bucking
Receiving two NGK NTK o2 sensors tomorrow. Meanwhile, car developped another symptom: stalls randomly at red lights (starts perfect when I crank it back).
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05-31-2016 | #65 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
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Re: Low RPMs bucking
Could you recap the changes you made prior to all this happening?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
05-31-2016 | #66 | |
Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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Re: Low RPMs bucking
Quote:
RECAP Problem: low rpm bucking, especially when cold. Stalling at red lights (restarts like a charm). Got codes 55 and 64 once, erased them and they never came back. Also experienced a strange knocking/rattling noise, which went away on its own. -Electrically tested the injectors, hot. Got between 17.3 and 17.9 ohms everywhere. -Spark plugs changed. -Fuel pumps removed, visual inspection done: nothing was wrong. -Fuel pressure tested. Idle: 41 psi, FP1: 46 psi, FP2: 48 psi. -Fuel filter changed. Receiving two NGK NTK o2 sensors tomorrow. |
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06-01-2016 | #67 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Low RPMs bucking
I think you have a bent DIS PIN
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
06-01-2016 | #68 |
Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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Re: Low RPMs bucking
I searched and I found this thread, which shows the connector. However, where is that connector?
http://www.zr1.net/forum/showthread.php?t=20184 Should be easy to check? |
06-01-2016 | #69 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Low RPMs bucking
under the plenum at the back of the intake
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
06-01-2016 | #70 |
Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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Re: Low RPMs bucking
So...
1. Change both o2 sensors. 2. Remove plenum and check for that connector. Should I check something else while the plenum is removed? |
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