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Engine UPDATED WITH FIX IN POST #49 Help with sputter issue with cold starts

  • Thread starter Thread starter silverlx50
  • Start date Start date Mar 24, 2020
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silverlx50

15 Year Member
Apr 4, 2007
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May 24, 2020
#41
  • May 24, 2020
  • #41
Today I pulled the upper intake to replace the freeze plugs. When I did I noticed a lot of oil on where the throttle linkage is, it was soaked on the bottom with oil and I could see where it has dripped onto my passenger side valve cover. I pulled the intake and found oil in the throttle body, almost pooled.

The oil has been running down the throttle body shaft following gravity into the throttle cable linkage.

My question is, could this be where my vacuum leak is? Could it be unmetered air coming in through that throttle body shaft into the intake causing issues on startup?

Here is a pic with the intake and throttle body upside down. I didn't have the oil leaking here prior to the Systemax intake so I'll try to figure out how to run a catch can in between the PVC and the intake.

(PVC, grommet and screen are new, lower intake baffle is in place)
 

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Last edited: May 24, 2020

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
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May 24, 2020
#42
  • May 24, 2020
  • #42
You need to find out where the oil is coming from.
A catch can I believe will treat the symptom. Like putting oil on a squeaky fan belt, it will not squeak bit still needs to be fixed.
 

silverlx50

15 Year Member
Apr 4, 2007
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38
May 24, 2020
#43
  • May 24, 2020
  • #43
General karthief said:
You need to find out where the oil is coming from.
A catch can I believe will treat the symptom. Like putting oil on a squeaky fan belt, it will not squeak bit still needs to be fixed.
Click to expand...
Sounds like it is a common issue with Holley Systemax intakes, I didn't have this oil issue prior to the Systemax.

Does the throttlebody need to be replaced?
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,926
10,572
203
polk county florida
May 24, 2020
#44
  • May 24, 2020
  • #44
I don't know, hit it with brake clean or similar when you get it back together and see if the idle changes.
 

silverlx50

15 Year Member
Apr 4, 2007
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Jun 5, 2020
#45
  • Jun 5, 2020
  • #45
Well no luck at all. Ive replaced the freeze plugs in the intake with RTV and I went ahead and replaced the 20 year old thermostat. Ive checked for vacuum leaks again and no luck. I also checked the O2 sensor orange ground and it is grounded to the back of the drivers side head.

This is what the car does. The garage is around 70 degrees.


View: https://drive.google.com/file/d/16n-zOmiLFWojHcRTdcMVzOgSB0VtZ0zF/view?usp=drivesdk
 

Foxslider

im not that much of a idiot
Oct 25, 2019
543
156
53
Houston, TX
Jun 5, 2020
#46
  • Jun 5, 2020
  • #46
Im ghetto, so if mine does this when i install it, ill prob. just JB weld those babies. Glad i skimmed thru this. GL.

Edit: doh, didnt see last post before comment.

You checked the TPS voltage eh?
 

silverlx50

15 Year Member
Apr 4, 2007
168
62
38
Jun 5, 2020
#47
  • Jun 5, 2020
  • #47
Foxslider said:
Im ghetto, so if mine does this when i install it, ill prob. just JB weld those babies. Glad i skimmed thru this. GL.

Edit: doh, didnt see last post before comment.

You checked the TPS voltage eh?
Click to expand...

Yeah, TPS is set at .85.

I ran the codes again today and get 12 KOER. I'll clean the IAB / IAC tomorrow.
 
Reactions: Foxslider

Foxslider

im not that much of a idiot
Oct 25, 2019
543
156
53
Houston, TX
Jun 5, 2020
#48
  • Jun 5, 2020
  • #48
It only happening cold and not hot eliminates a lot of things. Some of my thoughts: Id try a TFI if you can return it. Sounds vacuum related, but then the cold/hot thing eliminates that. Didnt sound all that bad in the video. Ignition coil if you aint got a fresh one.

2nd thought, maybe its suckin oil down on cool start up and bogging the engine. Add a valve cover filter? You got a lot of oil consumption going on?

GL.
 

silverlx50

15 Year Member
Apr 4, 2007
168
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38
Jun 6, 2020
#49
  • Jun 6, 2020
  • #49
I disconnected the battery, disconnected the IAC and then pulled it off. I let it soak with brake cleaner and cleaned it out with brake cleaner and Q-Tips. The IAC was new, only about 2K miles on it but it was pretty gummed up.

I let it dry and reinstalled it.

It seemed to have cured my start issue as of now so it seems like it was the dumb IAC the entire time.
 
Reactions: Foxslider and Cheapskate207

Foxslider

im not that much of a idiot
Oct 25, 2019
543
156
53
Houston, TX
Jun 7, 2020
#50
  • Jun 7, 2020
  • #50
Nice!
 
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