Hello from Florida
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6th Gear
Joined: Jul 2019
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Hello from Florida
Hi, I have an 02 convertible that kills #3 & #5 Injectors on any acceleration type. I have replaced ignition coils, spark plugs and ECM. I have battery voltage on injector circuits, but loose injector control while accelerating. I have Identifix Software Program. I have started a Hotline Support from them. They said could be something the ECM see's that is putting it into under power mode. They had me disable Abs and Traction Control, saying it might think car is loosing traction. No help yet. Any help would be greatly appreciated. Thanks Sam
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Moved this to C5 Tech.
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From: Anthony TX
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St. Jude Donor '08
Please describe the statement "that kills #3 & #5 Injectors on any acceleration type"
What do you mean by KILLS the injector???
I have a theory that may explain and solve your issue but need you to better describe what is happening to the INJECTORS. Do they drop out under acceleration and it returns to normal under non heavy acceleration periods.
Bill
What do you mean by KILLS the injector???
I have a theory that may explain and solve your issue but need you to better describe what is happening to the INJECTORS. Do they drop out under acceleration and it returns to normal under non heavy acceleration periods.
Bill
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I have trouble shot this and some very similar problems like this on several C5s. You have a wiring issue. Look at the back of the fuel rail on the drivers side of the engine. You will see a black metal bracket just behind the fuel rail.
There is a wiring harness for most of the engine sensors that runs down the top of the engine by the base of the valve cover and it bends around that black metal bracket.
That black metal bracket at the back of the fuel rail can damage the wiring harness. That harness can run tight on that bracket and damage the wires inside. Guess what cylinder coil & INJECTOR wires run inside that bracket????
Take the covering off the harness and inspect ALL the wires for rub/chafe or damage.
Bill
There is a wiring harness for most of the engine sensors that runs down the top of the engine by the base of the valve cover and it bends around that black metal bracket.
That black metal bracket at the back of the fuel rail can damage the wiring harness. That harness can run tight on that bracket and damage the wires inside. Guess what cylinder coil & INJECTOR wires run inside that bracket????
Take the covering off the harness and inspect ALL the wires for rub/chafe or damage.
Bill
Last edited by Bill Curlee; Jul 18, 2019 at 01:33 PM.
Thread Starter
6th Gear
Joined: Jul 2019
Posts: 6
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I have trouble shot this and some very similar problems like this on several C5s. You have a wiring issue. Look at the back of the fuel rail on the drivers side of the engine. You will see a black metal bracket just behind the fuel rail.
There is a wiring harness for most of the engine sensors that runs down the top of the engine by the base of the valve cover and it bends around that black metal bracket.
That black metal bracket at the back of the fuel rail can damage the wiring harness. That harness can run tight on that bracket and damage the wires inside. Guess what cylinder coil & INJECTOR wires run inside that bracket????
Take the covering off the harness and inspect ALL the wires for rub/chafe or damage.
Bill
There is a wiring harness for most of the engine sensors that runs down the top of the engine by the base of the valve cover and it bends around that black metal bracket.
That black metal bracket at the back of the fuel rail can damage the wiring harness. That harness can run tight on that bracket and damage the wires inside. Guess what cylinder coil & INJECTOR wires run inside that bracket????
Take the covering off the harness and inspect ALL the wires for rub/chafe or damage.
Bill
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Joined: Oct 2003
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From: Venice, Florida
Not farmilliar with the software you're using but in HP Tuners under Torque Management there's settings for spark retard vs. torque reduction and torque loss vs. spark retard etc. Has the car been tuned recently?
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From: Cape Coral, Florida
Now HOW did you ascertain that you are losing injector "control" ???...are you scoping the injector control circuits while sitting in the car accelerating ??...no data PIDS I know of that would show no control of the injector circuit. Will have to think about why it is OK in performance mode...strange !!
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6th Gear
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Yes i had scope on injector control pins at ECM. Have Injector Pulse until put in gear and torque brake slightly to moderate, and heavy. Only when i put it into Competition mode, it does not loose injector pulse, and runs fine. Identifix Tech said that the ABS Module or WSS could be in putting a signal that ecm thinks car is loosing control, and turns off 2 injectors to limit power so driver can regain control. No ABS Codes, All wheel speed sensors read the same. Flustered.
Thanks for all the input.
Thanks for all the input.
Last edited by statortot11; Jul 26, 2019 at 08:43 AM.
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From: Cape Coral, Florida
MMM ??...THINKING !!....first, usually with torque management the car usually cuts off 4 injectors not 2...does your scan tool show "Extended Brake Travel Switch" data PID ???...it may be misadjusted...if you scan tool has it make sure it shows "RELEASED" under accel !!...when you push the brake pedal down when it gets to almost half way applied it will show APPLIED....also if your scan tool shows "Requested Torque PWM Duty Cycle" it should be 10% if TC is active and 90% (at idle) when it's not active...tonight I'll see if I can think of anything else....let me look at the RTS circuit...if I have time maybe I'll scope it and check back...looks like it may have a 5 volt ref.voltage on it from the PCM !!
Last edited by C5 Diag; Jul 26, 2019 at 07:24 PM.
Racer
Joined: Oct 2003
Posts: 274
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From: Venice, Florida
Ok so when you're in compitition mode then "traction control" is turned off but "active handling" is still on.
(you have no issue)
You said you disabled the "traction control" and ABS but it didn't help.
(still have issue)
Have you tried only disabling the "traction control" and leaving ABS on?
Are you able to see the "traction control" settings with your tool?
(you have no issue)
You said you disabled the "traction control" and ABS but it didn't help.
(still have issue)
Have you tried only disabling the "traction control" and leaving ABS on?
Are you able to see the "traction control" settings with your tool?