hardcoreep
Member +
Have u changed your fuel brand/type recently.
What could retard timing (standard ECU)
- Thread starter azerty
- Start date
hardcoreep
Member +
Here's the issue. The car's dynamic timing is actually already advanced. If at idle you're at 17degrees then as you accelerate the timing would advance until detonation. I think your final test would be to use the EMU and adjust down the timing between 0 and 1000rpm. Check the timing at the ECU to see if the car has responded. If it does then just retune the timing across the rpm bands.
Timing tends to advance during lean mixtures, so maybe a look at your a/f ratios would give some clue.
Timing tends to advance during lean mixtures, so maybe a look at your a/f ratios would give some clue.
azerty
Supermoderator
I have checked TPS again following those steps :
http://www.toyotagtturbo.com/forums/showthread.php?47-Tutorial-TPS-setup-Procedure-weeJohn-*
everything is fine, so we can rule out TPS.
about dynamic range, are you sure there is such thing at idle ? why would we be able to set up idle timing if the ECU could do whatever he wants ?
I know there is a dynamique range when driving, but on iddle It sounds a bit weird, doesn't it
also, 17° timing value I get are form emanage and AUTOBOSS scanner, nothing proves those value are actualy right (as I said, I always heard emanage wasn't able to datalog real timing value, so I'm not sure those figures a right)
now I know timing light shows steady 10° . which I trust as this is mechanical reading
So I keep thinking ECU is receving wrong info and is trying to adjust. I have been talking with a tuner this morning which confirm my though. he says I might have ECU sync prob, which means the ECU is not syncronise to the engine. so it is acting crazy. now I'm realy thinking to try on other distri, as from what I understand, all figures sent to ECU comes from there.
any other opinions ?
http://www.toyotagtturbo.com/forums/showthread.php?47-Tutorial-TPS-setup-Procedure-weeJohn-*
everything is fine, so we can rule out TPS.
about dynamic range, are you sure there is such thing at idle ? why would we be able to set up idle timing if the ECU could do whatever he wants ?
I know there is a dynamique range when driving, but on iddle It sounds a bit weird, doesn't it
also, 17° timing value I get are form emanage and AUTOBOSS scanner, nothing proves those value are actualy right (as I said, I always heard emanage wasn't able to datalog real timing value, so I'm not sure those figures a right)
now I know timing light shows steady 10° . which I trust as this is mechanical reading
So I keep thinking ECU is receving wrong info and is trying to adjust. I have been talking with a tuner this morning which confirm my though. he says I might have ECU sync prob, which means the ECU is not syncronise to the engine. so it is acting crazy. now I'm realy thinking to try on other distri, as from what I understand, all figures sent to ECU comes from there.
any other opinions ?
Last edited:
what is a knock sensor?
By any chance are any of you with timing issue done a auto to manual convertion on your car?
I have and had a timing issue, I found it to be TPS (4 wire) no longer had 5v (vcc) input once I put the manual ecu in, so I tapped in to the map sensor 5v feed and linked it to where the TPS should have had a 5v feed and fixed the problem. My problem BTW was my car would only make around 160bhp when it had the mods and boost for around 200bhp and because the ecu didn't know what the TPS was doing it retarded the timing dramatically.
If this doesnt help sorry but I hope it does
Luke
I have and had a timing issue, I found it to be TPS (4 wire) no longer had 5v (vcc) input once I put the manual ecu in, so I tapped in to the map sensor 5v feed and linked it to where the TPS should have had a 5v feed and fixed the problem. My problem BTW was my car would only make around 160bhp when it had the mods and boost for around 200bhp and because the ecu didn't know what the TPS was doing it retarded the timing dramatically.
If this doesnt help sorry but I hope it does
Luke
Does help indeed. My car is an Auto -) so no conversion here! Can you get some pics of what you've done exactly and what should be 5V and what shouldn't -)
Thanks
sorry dude dont come on here much totally forgot
on the plug the pins are marked 1-4 on Auto
1 = Ground (0v)
2 = IDL (0v when TB closed)
3 = VTA (potentiometer)
4 = VCC (+5v)
on the plug the pins are marked 1-3 on manual (no +5v)
1 = IDL (0v when TB closed)
2 = Ground (0v)
3 = PSW (0v when TB open)
on map sensor plug pins are marked 1-3
1 = Ground (0v)
2 = PIM (potentiometer)
3 = VCC (+5v)
on the plug the pins are marked 1-4 on Auto
1 = Ground (0v)
2 = IDL (0v when TB closed)
3 = VTA (potentiometer)
4 = VCC (+5v)
on the plug the pins are marked 1-3 on manual (no +5v)
1 = IDL (0v when TB closed)
2 = Ground (0v)
3 = PSW (0v when TB open)
on map sensor plug pins are marked 1-3
1 = Ground (0v)
2 = PIM (potentiometer)
3 = VCC (+5v)
what are you seeing on the wideband when this happens?I am having the exact same problem, but don't have my egt gauge hooked up right now, but I am seeing the AFR's for to sub 10:1 sometimes and other times it will run fine. also seeing sometimes, usually after a long drive or a lot of load, the car will idle VERY lean(18:1) I think it has something to do with the air intake temp sensor, but I'm not sure. I'm keeping an eye on this and hopefully you'll get it fixed.
In my case it was MAP sensor.
dark_knight
Member +
lean AFR
i've got a narrow-band AFR readout on my a'pexi and on idle, it's usually around the same 18:1 which is quite lean.. & i've always thought it was normal..?
when running about with no boost, it's between 14.2 and 14.7 and when booting it, it comes down to about 10:1 and thereabout..
so, am i the only one with such readings..? i know narrow-band is not that accurate but it does give an idea of what your fuel system is doing..
i've got a narrow-band AFR readout on my a'pexi and on idle, it's usually around the same 18:1 which is quite lean.. & i've always thought it was normal..?
when running about with no boost, it's between 14.2 and 14.7 and when booting it, it comes down to about 10:1 and thereabout..
so, am i the only one with such readings..? i know narrow-band is not that accurate but it does give an idea of what your fuel system is doing..