Progress Thread 12th Owner: My '93 Notchback Restoration & Performance Build

Habu135

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Jan 10, 2019
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Was it doing this before you got the tune this summer? I went back to read about it a noticed you had a coolant leak. What ever came of that?

Drew
Yes, it did it prior to the most recent tune and the other two before that. The coolant leak was due to a blown head gasket. That's been resolved. I think I have an extra set of spark plug wires. I'll try swapping those.
 
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Habu135

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Jan 10, 2019
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Could it be tune related?
I don't think it is.

So to complete a basic diagnosis we focus on Air, fuel or ignition. It's not related to the body meaning something rubbing. The car is getting air and fuel. It has no problems consuming large quantities of gas and the problem comes and goes. I think it's spark related.
 

Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
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Coil, wires, plugs, cap, rotor, distributor electronics...

last one is also a big potential, especially the pip
 

Habu135

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Jan 10, 2019
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I'm not sure what the "pip" is.

I just called BBK as they're relatively close to me. They don't offer any ability to test the MAF meter and can't suggest anyone to me.

I'm going to run my codes again here shortly, but no Check Engine light is triggered when this issue pops up.
Coil, wires, plugs, cap, rotor, distributor electronics...

last one is also a big potential, especially the pip
Not
 

Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
34,595
10,767
224
Massachusetts
Pip sensor is inside the distributor.


See post 3 for troubleshooting
 

Habu135

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Jan 10, 2019
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Ran the codes. Same as back in Jul except for one.

KOEO: 85 can purge solenoid circuit failure
87: fuel pump primary circuit fault

KOER: 13 RPM at idle out of range/low
Code 41 popped up which was different from July. HEGO sensor voltage low/system lean.

Other than the dipstick housing is there any other items within the engine bay that would cause arcing or a misfire? My plug wires are running/organized to not touch anything. Hmm. It feels like a misfire or arcing under power.
 
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General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
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polk county florida
Reset the computer, drive it around, run the codes.
Another thing you can do to test the wires and cap, using a spray bottle of water, mist the plug wires while the engine is running to see if it drops a cylinder.
The code 41 does not mean the 02's are bad,
A miss is usually a cap or wires arcing.
 

Habu135

Advanced Member
Jan 10, 2019
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447
73
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California
Reset the computer, drive it around, run the codes.
Another thing you can do to test the wires and cap, using a spray bottle of water, mist the plug wires while the engine is running to see if it drops a cylinder.
The code 41 does not mean the 02's are bad,
A miss is usually a cap or wires arcing.
Can you dive deeper into the misting of the plug wires?
 

Habu135

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Jan 10, 2019
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It has a similar feel as to if the #7 or #8 wire was touching the steel dip stick housing, but I've fixed that by positioning the wires differently.
 

Habu135

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Inside of distributor mechanically looks good except I found this little round thing. Very odd.
 

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General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
18,482
6,051
193
polk county florida
Inside of distributor mechanically looks good except I found this little round thing. Very odd.
Vent, ignore it.
With the engine running at temp spray a mist of water on the cap and wires covering a small area at a time all the way to the plugs.
You say there was an issue with the plug wires at the dipstick tube?
 

Habu135

Advanced Member
Jan 10, 2019
735
447
73
40
California
Vent, ignore it.
With the engine running at temp spray a mist of water on the cap and wires covering a small area at a time all the way to the plugs.
You say there was an issue with the plug wires at the dipstick tube?
It's possible for the #7 wire to arc against the dip stick housing. I've corrected that, but it's a similar feel just not as strong.
 

Cheapskate207

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Jan 12, 2020
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You’re probably right about that. I was pointing out the fact that code 41 isn’t always caused by bad o2 sensors.