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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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AE101 4A-GZE ignition timing issues. Timing doesnt change going from DIAG mode to normal operation!
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Tue, 30 November 2004 13:06
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as per usual this is probably some really simple stupid oversight of mine or i'm just horribly worried for no reason....
With the 4A-GZE --> turbo AE101 conversion im doing, i now have everything running and working OK... but having problems with the ignition timing.
Here's the point form of whats happened:
# Currently set up as smallport gze with 100kW intake, exhaust, alternator, PS pump and aircon (ps/aircon belt removed for now). Of course complete Ae101 gze electrics are in place
# Got engine started, ran ok so i took it to exhaust shop to get exhaust welded on.
# Get home tonight
# Put ECU into DIAG mode by shorting Te1 and E1, then starting motor
# Took note of fault codes 51, 21, 24
# With engine still running and at operating temp, set ignition to 10deg BTDC
# Turn off engine.
# Remove wire shorting Te1 and E1
# Start engine
# Check ignition timing - is STILL 10deg BTDC!!!!. so turn off engine
# Put ECU back into DIAGNOSTIC mode
# start up and again set ignition timing to 10deg BTDC
# remove the short whilst engine running, and checked timing
# STILL 10deg BTDC!!!!! :angry: :angry:
Now this is a serious problem to me!!!!!
On the smallport 4A-GE in my AE71, following the above when i removed the short, the ignition timing automatically JUMPED up to about 20-30deg BTDC. This is normally how you check that the ignition timing control in the ECU is working, AFAIK.
can anyone shed any light or experiences my way??
FYI = codes are for O2 sensor (not connected yet), THA (air intake temp - also not installed yet) and A/C switch (also not connected). Otherwise i havent yet seen any other codes. I only got these codes whilst the car was running. I will attempt the non-starting DIAG mode in the morning or something.
[Updated on: Tue, 30 November 2004 13:11]
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Registered:
July 2002
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: AE101 4A-GZE ignition timing issues. Timing doesnt change going from DIAG mode to normal operati
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Tue, 30 November 2004 20:53
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fairy muff - thanks for the tips anthony. It just didnt seem right when compared to how my 100kW behaved.
What RPM? hmmm..... well i was using a handheld CRO to work that out at about 800-1000rpm (rough, was viewing waveform period and multiplying out)
I'll plug the O2 sensor in tonight if i get the chance, i couldnt be bothered running wires to the front before 
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Location:
sydney
Registered:
March 2003
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Re: AE101 4A-GZE ignition timing issues. Timing doesnt change going from DIAG mode to normal operati
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Tue, 30 November 2004 21:20
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dont worry to much if timin isnt changing much
if the ecu spits out the codes then the ecu is understanding
to go into diag mode
another thing which can affect timing is the adjustment of the throttle sensor
i once had probs with a 100kw in an ae86
because the throttle wasnt set correctly
the timing would not retard when in limp mode
this mean the timing was way to advanced
took ages to find out
so check for idle contact and voltage at throttle
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: AE101 4A-GZE ignition timing issues. Timing doesnt change going from DIAG mode to normal operati
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Tue, 30 November 2004 23:30
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true - that could potentially pose a problem as i am using the 100kW manifold and thus a 100kW TPS.
By the looks of it i can swap over the GZE TPS no worries if necessary. But in testing i will just plug the TPS in from the GZE TB as i have that separated (is pretty small).
More testing is required, of course  Will let you all know how i go.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: AE101 4A-GZE ignition timing issues. Timing doesnt change going from DIAG mode to normal operati
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Sun, 05 December 2004 12:22
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I FIXED IT!!!
Installed an o2 sensor, connected up the intake air temp sensor (dodgily), wired up a proper tacho and checked everything else... and then....
i set the TPS properly (Toymods tech docs are good), reset the ECU and made sure i was clear of all fault codes (minus AIRCON #51).
And it worked 
It only jumped from 10deg to about 13-14, but you can tell its advancing the timing properly as it moves about whilst staying at the same RPM....
now i have other issues, but lets not go there.
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