Hi all,
Today we had time to log some runs in the 1/4 mile raceway.
Had some misfires, we logged a lot of things but nothing seemed to be the start of this misfire.
I also noticed that the Stack rpm was falling when the misfire occurs, so it was definitely an input problem.
Later we saw the engine diagnostic display.
I had 3 concerens here
cam sensor 10
rejected crack pulses 8
synthetic tooth errors 4
Does the Cam sensor effect anything after the engine is in sync and running?
Do rejected crank cause misfire?
Do synthetic tooth errors cause misfire?
Thanks and Regards
engine diagnostic
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Re: engine diagnostic
If the RPM is dropping, then it's a signal issue from the crank or cam sensor.
However, you don't have enough of either error to have had more than two misfires, unless the diagnostics have been reset? The number of wheel pulses would suggest not.
The ECU will reset if the there are more than 4 cam/crank sensor errors. If you've had a number of misfires, then this is not the problem.
However, you don't have enough of either error to have had more than two misfires, unless the diagnostics have been reset? The number of wheel pulses would suggest not.
The ECU will reset if the there are more than 4 cam/crank sensor errors. If you've had a number of misfires, then this is not the problem.
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Re: engine diagnostic
To add to what Alex says you have had 15 resets since last cleared, does that sound right? as in you turned the engine on and off 15 times.
Re: engine diagnostic
If i have misfires next sunday should i try it in wasted not sequential.
Will this eliminated the chance of the cam sensor errors interfering?
Regards
Will this eliminated the chance of the cam sensor errors interfering?
Regards
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- Posts: 1622
- Joined: Fri Feb 28, 2014 1:03 pm
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Re: engine diagnostic
Yes.
Make sure injectors are not in sequential, and coils are in wasted spark mode, and cam control is off
Send me a copy of the map if you want me to check it for you
Make sure injectors are not in sequential, and coils are in wasted spark mode, and cam control is off
Send me a copy of the map if you want me to check it for you
Re: engine diagnostic
Hi All,
The missfires were probably coming from over boost cut. I need to check how does any cut work.
I saw that there are different cut patterns but i still didn't read this part.
Thanks guys
The missfires were probably coming from over boost cut. I need to check how does any cut work.
I saw that there are different cut patterns but i still didn't read this part.
Thanks guys
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- Posts: 1250
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Re: engine diagnostic
The overboost is a full cut and has nothing to do with the cut patterns, the overboost cut maintains cut to all sparks until the boost has dropped below its set point again. It's pretty brutal in its operation,
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- Posts: 1622
- Joined: Fri Feb 28, 2014 1:03 pm
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Re: engine diagnostic
I really need to make the overboost cuts clearer, as the answer to your question was there, and we all missed it.
As Rob says, it's a simple hard cut to the engine. It's to protect against failed waste gates/valves, which is why we don't use a PWM modification.
As Rob says, it's a simple hard cut to the engine. It's to protect against failed waste gates/valves, which is why we don't use a PWM modification.