LS3 Cutting out at Full Throttle

acefuture said:
Something I went through on my car last season (you were there to see it) is like @Jersey_Jeff73 mentioned, the Holley system is very sensitive to noise. One suggestion my tuner had is to make sure the alternator lead cable is isolated away from ANY other wiring. The noise it omits can interfere with sensor cables and throw off readings making the computer throw wild adjustments to make up for it. So check that your alternator cable is no where near any other wires.

We'll swing by your camp when we are out next week btw
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I'll try that too - lead cable meaning the main big wire, or the signal wire to the dash? and cool- hopefully we can actually do a buggy ride this time!...canAm was boring as F :)
 
wesinls said:
I'll try that too - lead cable meaning the main big wire, or the signal wire to the dash? and cool- hopefully we can actually do a buggy ride this time!...canAm was boring as F :)
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Yep the big lead charging cable. Low voltage is not (shouldn't be) an issue
 
Sharing some knowledge...Redline gave me a call and suggested I put a 1k ohm 1/4w resistor between connections A and C on the cam sensor cable...essentially "y" it into those two connections...It helps to strengthen the signal apparently...I'll be trying this and will report back. Figure I'd share the info in case it helps others. Redline mentioned they've had to do this on 7 or 8 Holley harnesses in the past. Hoping for the best.

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i have a dyno shop and have seen a TON of GM LS3 crank position sensors failing lately. they run ok till about 4000+ and just start misfiring and popping like crazy.

even BRAND NEW dealer GENUINE GM sensors for the LS3/7 crank failing right out of the box.
 
Pulling the accessory belt would rule out alternator issues quickly.
 
r3meyer said:
Just a straight swap and that fixed it?
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Yes, couldn't believe it - I was so stoked when that resolved the issue...it was the last sensor to show up and arrived the day before I was leaving...I didn't change it out until after doing the resistor thing I mentioned above. I made it a point to only change one thing, test, and repeat. I order another one too - I now have a spare for every sensor on the engine.
 
I saw you running this weekend. Car looked great. I tried to snap a picture but all that was left was dust!
 
wesinls said:
Yes, couldn't believe it - I was so stoked when that resolved the issue...it was the last sensor to show up and arrived the day before I was leaving...I didn't change it out until after doing the resistor thing I mentioned above. I made it a point to only change one thing, test, and repeat. I order another one too - I now have a spare for every sensor on the engine.
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Maybe it was shorting to ground and screwing up the other sensors on that common ground/power wire? Odd it screwed everything up on the engine so badly. Good news either way.
 
Rockwood said:
Maybe it was shorting to ground and screwing up the other sensors on that common ground/power wire? Odd it screwed everything up on the engine so badly. Good news either way.
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Maybe, but i just changed the sensor and nothing else when it resolved the issue.
 
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