Service Engine Light
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
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From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Service Engine Light
My CE LT4 with Elliot Portworks LE2 package triggers the engine light like every three weeks. The "misfire" code comes out and yes I have a OBD scanner and I can delete the code.
What it could be? The ECM was tuned, all parts are new, plugs are new...
The Vette runs great and STRONG. Would the IAC or TBPS have anything to do with this? That part is old/original
What it could be? The ECM was tuned, all parts are new, plugs are new...
The Vette runs great and STRONG. Would the IAC or TBPS have anything to do with this? That part is old/original
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
P0300 Random Misfire Detected
Freeze Frame Data
Fuel Sys 1: CL
Fuel Sys 2: CL
Calc Load (%): 4.31
ECT(°C): 79
STFT B1 (%): 0.78
LTFT(%): 3.13
STFT(%): 2.34
LTFT(%): -1.56
MAP(kPa): 67.00
Eng RPM: 737
Veh Speed (km/h): 0
MAF(g/s): 11.26
TPS(%): 0.00
Reading at the idle Eng RPM (I was at a stop light) in the code reader and what is in the tach are two numbers. Obviously it is too low, right?
Le Mans Master
Joined: Feb 1999
Posts: 9,916
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Right now it indicates random misfires. If the last number of the code were a 3, it would indicate cylinder #3 is misfiring.
The underlying cause is often a lean fuel condition, which may be due to a vacuum leak. Check hoses, wires etc. Its a ****ting intermittent fault.
in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open(your is LT4, no EGR, correct but a plate back there).
The underlying cause is often a lean fuel condition, which may be due to a vacuum leak. Check hoses, wires etc. Its a ****ting intermittent fault.
in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open(your is LT4, no EGR, correct but a plate back there).
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
I haven't drive her yet because I'm doing the rear window, the rear pillar and targa weatherstrips but even tough I torque everything to specs (FSM) the EGR plate, the MAP, The TB and the Air Pump bolts were loose. I hope the intake manifold itself is not loose, I torque that SOB 4 times using the proper sequence.
BTW, the targa's weatherstrips were a P A I N I N T H E A X S Z
Le Mans Master
Joined: Feb 1999
Posts: 9,916
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
I haven't drive her yet because I'm doing the rear window, the rear pillar and targa weatherstrips but even tough I torque everything to specs (FSM) the EGR plate, the MAP, The TB and the Air Pump bolts were loose. I hope the intake manifold itself is not loose, I torque that SOB 4 times using the proper sequence.
I did apply dielectric grease to the plugs and to the opti's terminals but I'll check on those tonight
BTW, the targa's weatherstrips were a P A I N I N T H E A X S Z
I did apply dielectric grease to the plugs and to the opti's terminals but I'll check on those tonight
BTW, the targa's weatherstrips were a P A I N I N T H E A X S Z
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Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Le Mans Master
Joined: Feb 1999
Posts: 9,916
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
