Sniper surging all of a sudden - Page 2 - Chevelle Tech
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post #16 of 30 (permalink) Old Jun 18th, 19, 11:52 AM
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Re: Sniper surging all of a sudden

check plugs maybe? Based off you statement your in closed loop when it surges. Sure o2 sensor is good?

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post #17 of 30 (permalink) Old Jun 18th, 19, 11:53 AM
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Re: Sniper surging all of a sudden

If you watch the RPM readout does it appear to be matching the engine speed perfectly or is there maybe occasional blips?

Is the ignition stand alone or is the sniper running it?

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post #18 of 30 (permalink) Old Jun 18th, 19, 12:28 PM
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Have you adjusted your IAC at hot idle to be between 2 and 10% that’s what I would be doing first. Then if you have a laptop of whatever that has windows I’d get the software and get a datalog and post that and your confit file to the Holley forum for the guys there to take a look at.

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post #19 of 30 (permalink) Old Jun 18th, 19, 6:35 PM Thread Starter
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Re: Sniper surging all of a sudden

Quote:
Originally Posted by 73Eldo View Post
If you watch the RPM readout does it appear to be matching the engine speed perfectly or is there maybe occasional blips?

Is the ignition stand alone or is the sniper running it?
It does seem to match engine

1967 Royal Plum, 434BB, AFR Heads, 3.90 gears, New Chris Straub Hyd Roller!, 200r4
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post #20 of 30 (permalink) Old Jun 18th, 19, 6:38 PM Thread Starter
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Re: Sniper surging all of a sudden

Quote:
Originally Posted by JF74chevelle View Post
Have you adjusted your IAC at hot idle to be between 2 and 10% thatís what I would be doing first. Then if you have a laptop of whatever that has windows Iíd get the software and get a datalog and post that and your confit file to the Holley forum for the guys there to take a look at.
I called Holley this morning. I adjusted the IAC to between 2 and 10 just before I called. He suggested going through the start up wizard after that. It is currently not surging, but I am worried what will happen when I am in the 180 temps. That is when it started yesterday

1967 Royal Plum, 434BB, AFR Heads, 3.90 gears, New Chris Straub Hyd Roller!, 200r4
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post #21 of 30 (permalink) Old Jun 18th, 19, 6:41 PM Thread Starter
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Re: Sniper surging all of a sudden

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Originally Posted by Peewee0413 View Post
check plugs maybe? Based off you statement your in closed loop when it surges. Sure o2 sensor is good?

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Iíll check a plug after I run it next. Nothing concerning when looking at AFR, so I believe O2 is working properly so far

1967 Royal Plum, 434BB, AFR Heads, 3.90 gears, New Chris Straub Hyd Roller!, 200r4
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post #22 of 30 (permalink) Old Jun 18th, 19, 11:39 PM Thread Starter
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Re: Sniper surging all of a sudden

I believe I found a cause for the surging issues. It looks like when the temp goes up to 175 the fan 1 setting goes to on, then the car acts all crazy. Once temp goes down to 170, it is back to normal. I need to find out how to deactivate the fan and ac settings, since I have no ac and a clutch fan.

1967 Royal Plum, 434BB, AFR Heads, 3.90 gears, New Chris Straub Hyd Roller!, 200r4
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post #23 of 30 (permalink) Old Jun 19th, 19, 12:26 AM
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Re: Sniper surging all of a sudden

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Originally Posted by scalise71 View Post
I believe I found a cause for the surging issues. It looks like when the temp goes up to 175 the fan 1 setting goes to on, then the car acts all crazy. Once temp goes down to 170, it is back to normal. I need to find out how to deactivate the fan and ac settings, since I have no ac and a clutch fan.
In outputs..put the on super high.?? I'm a fitech guy so I dont know much about sniper.

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post #24 of 30 (permalink) Old Jun 19th, 19, 10:23 AM
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Re: Sniper surging all of a sudden

Quote:
Originally Posted by scalise71 View Post
I believe I found a cause for the surging issues. It looks like when the temp goes up to 175 the fan 1 setting goes to on, then the car acts all crazy. Once temp goes down to 170, it is back to normal. I need to find out how to deactivate the fan and ac settings, since I have no ac and a clutch fan.
Is the fan control wire trimmed off and insulated? If it is shorting something else, that might make sense.

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post #25 of 30 (permalink) Old Jun 19th, 19, 1:28 PM Thread Starter
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Re: Sniper surging all of a sudden

I just set the fan 1 and 2 to 260 degrees, didnít seem to be a way to turn off. I set the AC control to 0%. I believe the wires were removed from the plug entirely. I will double check. Thank you.

1967 Royal Plum, 434BB, AFR Heads, 3.90 gears, New Chris Straub Hyd Roller!, 200r4
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post #26 of 30 (permalink) Old Jun 19th, 19, 1:50 PM Thread Starter
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Re: Sniper surging all of a sudden

They were removed with a pin removal tool

1967 Royal Plum, 434BB, AFR Heads, 3.90 gears, New Chris Straub Hyd Roller!, 200r4
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post #27 of 30 (permalink) Old Jun 23rd, 19, 11:05 AM
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Re: Sniper surging all of a sudden

There is a check box by Fan 1 and Fan 2 in System Parameters> Basic I/O that you can uncheck to disable them. I am assuming you are laptop tuning? If not, do yourself a big favor and go ahead and get the laptop USB cable.

When troubleshooting the Sniper it is a little different than with a carb. With the carb you pretty much know it is a mechanical issue like vacuum leaks etc. With the Sniper you actually should start with electrical troubleshooting. Electromagnetic Interference (EMI) specifically.

Troubleshooting always begins with capturing a data log of the event. Post the log and your config file and we can help a lot more.

You may have some EMI issues causing the problem but that will show up in the log.
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post #28 of 30 (permalink) Old Jun 23rd, 19, 5:03 PM Thread Starter
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Re: Sniper surging all of a sudden

Quote:
Originally Posted by Greg Owens View Post
There is a check box by Fan 1 and Fan 2 in System Parameters> Basic I/O that you can uncheck to disable them. I am assuming you are laptop tuning? If not, do yourself a big favor and go ahead and get the laptop USB cable.

When troubleshooting the Sniper it is a little different than with a carb. With the carb you pretty much know it is a mechanical issue like vacuum leaks etc. With the Sniper you actually should start with electrical troubleshooting. Electromagnetic Interference (EMI) specifically.

Troubleshooting always begins with capturing a data log of the event. Post the log and your config file and we can help a lot more.

You may have some EMI issues causing the problem but that will show up in the log.
Thank you Greg. I will get the cable ASAP. I have not had the opportunity to get the car out since I adjusted the parameters. I cannot see the actual check boxes on the hand held. Sam

1967 Royal Plum, 434BB, AFR Heads, 3.90 gears, New Chris Straub Hyd Roller!, 200r4
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post #29 of 30 (permalink) Old Jun 24th, 19, 5:50 PM Thread Starter
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Re: Sniper surging all of a sudden

I ran the car for about 30 miles today. 80 degrees out so it was able to get above the 180 threshold where I was having issues. It ran well, no surging or gasping. So for the time being, changing those parameters cured the symptoms. I did start the data log when I started driving. I will have to figure out how to remove the chip, and try to download the info.

1967 Royal Plum, 434BB, AFR Heads, 3.90 gears, New Chris Straub Hyd Roller!, 200r4
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post #30 of 30 (permalink) Old Jun 24th, 19, 11:10 PM
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Re: Sniper surging all of a sudden

Push it in and it will pop out.
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