#21  
Old 06-16-2022, 03:00 PM
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You called it... I can't open this file. Not sure why. Gonna have to do some reading of the manual I guess...

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'65 Tempest 467 3650# 11.30@120.31
  #22  
Old 06-16-2022, 09:21 PM
TransAm400 TransAm400 is offline
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I think Sniper software is different than the regular Holley Dominator or HP.

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1964 Catalina 462/TKO600
1965 GTO 389/4speed
  #23  
Old 06-16-2022, 09:29 PM
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The Sniper is what I downloaded. And what I used to look at the log.

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'65 Tempest 467 3650# 11.30@120.31
  #24  
Old 06-17-2022, 10:12 AM
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It could be a sticking PCV valve , that does not open/close all the way during transitions of high/low vacuum . it migth be worth using a fixed orifice PCV as a means to troubleshooting. and not a permanent solution if the fixed orafice valve can not evacuate cranck case pressure under all operating modes.

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  #25  
Old 06-23-2022, 09:37 AM
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Mike, how did this turn out?

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'65 Tempest 467 3650# 11.30@120.31
  #26  
Old 06-23-2022, 10:49 AM
TransAm400 TransAm400 is offline
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Didn't have time to work on it last week. Hoping to mess with it this weekend.

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1964 Catalina 462/TKO600
1965 GTO 389/4speed
  #27  
Old 06-23-2022, 10:57 AM
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Cool, hopefully you'll update us. Good luck

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'65 Tempest 467 3650# 11.30@120.31
  #28  
Old 06-24-2022, 11:30 AM
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Add the MAP readings to the DL and repost a still image. That would give a better view of where your MAP is compared to timing. (may point you to IAC or PCV)

Looking at the timing map, below about 66 kPa, timing ramps down pretty slow. I know you mentioned it happened 'all of a sudden', but think the timing needs some work.

If you're in the below 50 kPa range when you lift of the throttle (most likely are), you're in the 30-38 degree range (or more) all the way down to 1500 RPM.

I would probably take the 25 degree amount and block up to the 1000 RPM mark too. If you see an increase in idle engine coolant temp after you do that, you can work it a little more.

I'm guessing you did a TPS autoset of course.

If it's the throttle plates or linkage hanging, it would show in the TPS value. Same if IAC is hanging.

Do see some RFI in your timing DL too, not sure if it's at a concern-able amount or not. Might be a bad plug wire or crossfire.


.

.

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  #29  
Old 06-24-2022, 01:45 PM
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Agree the timing probably needs a little tweaking, but having fun efi with a stepper IAC on a distributor locked at 36į for awhile, I don't think it will be the smoking gun here. Doesn't hurt to check it though

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'65 Tempest 467 3650# 11.30@120.31
  #30  
Old 06-25-2022, 01:28 PM
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Took the spacer out and put a new gasket under the TB. Also cleaned the IAC. Havenít been able to drive it yet but it idles good in the driveway and returns to idle quickly when you hit the throttle. Hopefully see how it drives tomorrow.

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1965 GTO 389/4speed
  #31  
Old 06-25-2022, 02:28 PM
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Good news!

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'65 Tempest 467 3650# 11.30@120.31
  #32  
Old 06-26-2022, 03:12 PM
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Well I think its fixed but it didnít have anything to do with the spacer. Adjusted the idle stop screw about a 1/4 turn and it seems to be perfect now. Dont know why it started all the sudden but I guess the throttle blades were open just a little too much.

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1965 GTO 389/4speed
  #33  
Old 06-26-2022, 03:23 PM
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Good that it's fixed. Does it have a spring to load the screw, and is it intact?

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'65 Tempest 467 3650# 11.30@120.31
  #34  
Old 06-27-2022, 07:25 PM
TransAm400 TransAm400 is offline
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Yeah the spring is there. This is a pretty new set up.

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