jtorres
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« on: September 20, 2012, 12:55:20 PM »
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Hello, i was messing with a 1.8T that after starting the engine, the lambda goes to 0.75 ECU part 06A 906 032 KP
I did changed a new wide band lambda at first but resulted the same. We also tested that ecu on another car and it worked fine, also another know well ecu on such engine with the same results (lambda 0.75!).
I read about a protection feature of the ME7.5 that causes that lambda value in order to protect the engine, but after changing some sensors (IAT, ECT, etc.) the problem persist.
What can be the reason for this?
THX.
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nyet
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« Reply #1 on: September 20, 2012, 12:57:33 PM »
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DTCs? CEL?
Stock file? EGTs coded out?
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jtorres
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« Reply #2 on: September 20, 2012, 01:06:35 PM »
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stock file, I don´t have DTC´s at hand. I will post it later.
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jtorres
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« Reply #3 on: September 20, 2012, 01:10:47 PM »
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This is a swapped engine 1.8T into a Golf MK2. It is not our first swap, but it is the first time with this problem. We did even tested a different engine harness  |
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k0mpresd
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« Reply #4 on: September 20, 2012, 01:11:41 PM »
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n112 unplugged?
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jtorres
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« Reply #5 on: September 20, 2012, 01:14:26 PM »
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I will take a look about the N112 this afternoon, i don´t have the car with me right now.
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jtorres
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« Reply #6 on: September 20, 2012, 01:20:04 PM »
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Any other suggestion on what to check?
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jtorres
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« Reply #7 on: September 20, 2012, 09:01:52 PM »
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DTC´s showed:
N80, N249 open circuit
ABS and data bus no comunication
Nothing else.
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nyet
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« Reply #8 on: September 20, 2012, 09:35:14 PM »
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request is .75 or actual is .75 (or both)?
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jtorres
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« Reply #9 on: September 20, 2012, 10:09:57 PM »
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Actual is .75 and request 1.000
Confirmed actual with external aem wideband.
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prj
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« Reply #10 on: September 21, 2012, 02:05:34 AM »
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Are you sure request is 1.0? What does lamsbg_w say?
If so, it means you probably have wrong injectors or incorrect fuel pressure.
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hipeka
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« Reply #11 on: September 21, 2012, 02:14:59 AM »
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Actual is .75 and request 1.000
Confirmed actual with external aem wideband.
Does ECU shows actual 1.00 or 0.75 (Data logging, not measured) ? I had same problem when SAI+CAT HEATING was disable uncorrect. Ecu showed requested and actual 1.00 but real lambda value was somewhere near 0.8 . Thats because ecu request cat heating (more fuel + secondary air) but because SAI system were removed (pump+hoses+SAI diagnosis) it could not get secondary air in. That cause rich micture when idling a while and cat temp went low enought. Then i removed SAI+CAT HEATING "correctly" with help of this forum and local tuner -> all those idle micture problems went away. |
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« Last Edit: September 21, 2012, 02:43:28 AM by hipeka »
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phila_dot
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« Reply #12 on: September 21, 2012, 05:20:38 AM »
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Does ECU shows actual 1.00 or 0.75 (Data logging, not measured) ?
I had same problem when SAI+CAT HEATING was disable uncorrect. Ecu showed requested and actual 1.00 but real lambda value was somewhere near 0.8 . Thats because ecu request cat heating (more fuel + secondary air) but because SAI system were removed (pump+hoses+SAI diagnosis) it could not get secondary air in. That cause rich micture when idling a while and cat temp went low enought.
Then i removed SAI+CAT HEATING "correctly" with help of this forum and local tuner -> all those idle micture problems went away.
This makes no sense. SAI and cat heating affect the mixture through target Lambda. If lamsbg_w is 1 then it I don't see how that could happen. Also, I am assuming you have a wideband ECU with your reference to actual, so you are saying that lamsoni_w was also 1. |
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hipeka
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« Reply #13 on: September 21, 2012, 05:36:23 AM »
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This makes no sense.
SAI and cat heating affect the mixture through target Lambda.
If lamsbg_w is 1 then it I don't see how that could happen.
Also, I am assuming you have a wideband ECU with your reference to actual, so you are saying that lamsoni_w was also 1.
At the time i was facing this problem i only had vcds in use so i dont what lamsbg_w or lamsoni_w were. I have wideband ECU. Only thing i am sure is that i couldnt pass exhaust test because lambda and CO values were too high -> after SAI and CAT HEATING mods values are really good. |
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littco
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« Reply #14 on: September 21, 2012, 05:42:49 AM »
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Is the loom from the matching car the ecu came from?
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