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

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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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
 
Pip sensor is inside the distributor.


See post 3 for troubleshooting
 
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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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.
 
Inside of distributor mechanically looks good except I found this little round thing. Very odd.
 

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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?