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Author Topic: EEC-IV timing advance control  (Read 2356 times)
skarhed
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« on: June 02, 2010, 10:00:29 am »

I've run a search on this and I'm still not finding a clear answer to my question;
Will the EEC-IV system pull timing back if you set initial advance too high (in it's opinion)
The car is a '91 Lincoln Mark VII LSC: original 5.0 HO, original speed-density ECM, deleted intake silencer box, K&N drop-in filter, GT-40 intake, FRPP 1-5/8" shorty headers, 2-1/2" Pypes 'off-road' x-pipe, 2-1/2" Magnaflow exhaust, deleted air pump and blocked off EGR with the resistor trick.
Found the factory original setting to be only 6 deg. BTDC
With initial timing advance set at 12 deg. BTDC (SPOUT removed) can run 87 octane with no issues and cut 0.3 seconds off of my 1/4 mile ET.
Have bumped it up to 16 deg. BTDC on 91 octane and for a week or so it runs really good, however it seems to act like its pulling timing back now. Haven't had a chance to run on the track for a new ET but 'seat of pants' felt better, at first anyway.
Thoughts, suggestions appreciated.
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Joel5.0
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« Reply #1 on: June 02, 2010, 11:54:06 am »

Nope.... unless you have a failure code logged causing the EEC to retard timing due to the "limp mode" strategy, the EEC does not pull timing back. Suggest to run the KOEO and KOER self tests = http://sbftech.com/index.php/topic,2471.0.html

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skarhed
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« Reply #2 on: June 03, 2010, 09:05:24 am »

Thank you. I'll run the tests, its probably just me.
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skarhed
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« Reply #3 on: June 14, 2010, 01:16:42 pm »

Update: checked codes, got an O2 out of range reading. While pondering this and reading the manual I found my notes and it'd been 20,000 miles since I installed the K&N drop-in filter!!! Did the clean and re-oil and all is well, runs like a striped a*$ ape. Had no idea I'd driven that much since then. Note to self: always check the basics first...
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Robert King
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« Reply #4 on: June 14, 2010, 06:35:51 pm »

I've run a search on this and I'm still not finding a clear answer to my question;
Will the EEC-IV system pull timing back if you set initial advance too high (in it's opinion)
Glad you got your issue resolved.

I want to touch on something you said in your initial post.  In order for EEC-IV (or any ECU,) to pull timing if the initial timing is set too high, the computer has to know what the initial timing is.  There's no way for the computer to know what this is in an EEC-IV system.  there's no sensor that tells the system how far rotated the distributor is.  The PIP sensor there only registers when a vane on the distributor shaft passes it.  It can't tell the relationship of the distributor shaft or the pip sensor is to the camshaft.
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« Reply #5 on: June 14, 2010, 07:52:41 pm »

Cool! ^^^^ That makes sense! Thanks for the info.
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