NefMoto > Technical > Diagnostics > ME7.5 Lambda goes to 0.75 at idle, engine protection feature?
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Author Topic: ME7.5 Lambda goes to 0.75 at idle, engine protection feature?  (Read 24014 times)
jtorres
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« Reply #15 on: September 21, 2012, 07:59:36 AM »
Quote from: littco on September 21, 2012, 05:42:49 AM
Is the loom from the matching car the ecu came from?

I am not sure, ecu is from an AWW i will check from which car the loom came. we have the donor car at hand. Some times i though there is a wire or signal that is incorrectly feed to the ECU


from hipeka: Does ECU shows actual 1.00 or 0.75 (Data logging, not measured) ?


Yes at the block 31 the actual lambda showed .75 and requested 1.000, and confirmed it is pig rich with an aem wideband.
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matchew
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« Reply #16 on: September 21, 2012, 08:22:42 AM »
What is lambda correction factor in block 99?
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jtorres
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« Reply #17 on: September 21, 2012, 08:29:11 AM »
Quote from: matchew on September 21, 2012, 08:22:42 AM
What is lambda correction factor in block 99?


i will check
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phila_dot
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« Reply #18 on: September 21, 2012, 10:21:38 AM »
Quote from: matchew on September 21, 2012, 08:22:42 AM
What is lambda correction factor in block 99?

Just curious, why 99 and not 32/33?
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jtorres
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« Reply #19 on: September 21, 2012, 11:17:42 AM »


Just checked car has a AWP wiring loom and we are using an AWW ECU (06A906032KP). Can be that the cause of the trouble?

Is a swapped engine to a MK2 Golf remember.
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jtorres
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« Reply #20 on: September 21, 2012, 11:22:38 AM »


found this harness comparison at vortex but cannot find something really different from AWW to AWP

http://forums.vwvortex.com/showthread.php?5049235-APH-AWW-AWP-AWV-wiring-harness-comparison
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k0mpresd
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« Reply #21 on: September 21, 2012, 02:56:19 PM »
pretty sure 032kp is awp.
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jtorres
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« Reply #22 on: September 21, 2012, 09:32:43 PM »
Quote from: k0mpresd on September 21, 2012, 02:56:19 PM
pretty sure 032kp is awp.


You are completely right, not sure why i was confused with that!


What can be happen there? the car starts fine and after a minute the lambda starts to move from 1.000 to .75 and stays there.

At block 99 the lambda correction is -26%. Inyection time at idle is around 1.76 ms when lambda shows 0.75,  little high as the regular inyection time at idle is around 1.3 ms.

I did checked the fuel return to the tank is OK and tried anoter FPR thinking it can be stuck close. Also tested another MAP sensor today with no luck. Several wires from the ECU connector was checked for continuity, also tried another lambda probe. There is no dtc´s other than the abs comunication and the data bus. N112, N80 and N249 solenoids were connected and DTC´s are off now.

I am thinking that maybe some input are feeding the ECU incorrectly but checked the IAT and ECT and they have regular readings when connected and disconnected. I did also tested  with the MAF plugged and unplugged, samo samo.


I am kind of lost, this is not my first 1.8T swap, thinking to try another harness now.
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matchew
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« Reply #23 on: September 21, 2012, 09:48:52 PM »
Is the engine, MAF and ECU from the same donor car?
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jtorres
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« Reply #24 on: September 21, 2012, 09:51:18 PM »


Yes, but anyway thinking of a failed MAF, when disconnected it is not suposed to go that rich at idle
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prj
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« Reply #25 on: September 22, 2012, 02:43:51 AM »
Measure your fuel pressure in rail, leave ECU alone for now.
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PM's will not be answered, so don't even try.
Log your car properly.
Gonzo
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« Reply #26 on: September 22, 2012, 07:01:25 AM »
You need to resistor emission items.
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phila_dot
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« Reply #27 on: September 22, 2012, 09:02:32 AM »
Quote from: Gonzo on September 22, 2012, 07:01:25 AM
You need to resistor emission items.

How can it be related to emmisions components if target Lambda is 1?

OP, are you sure the ECU matches all the hardware (i.e. injectors)?
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k0mpresd
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« Reply #28 on: September 22, 2012, 09:41:29 AM »
plus he already said they are plugged in.
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jtorres
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« Reply #29 on: September 22, 2012, 10:12:01 PM »

Yes oem injectors with oem tune. All emissions are resistored now: N112, N80. Also N249.

There is no DTC´s other than the abs and data bus. I am thinking on a bad harness or a bad connection that inputs a wrong signal or something like that. I will test another loom cause this thing is driving me crazy.
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