Lamda Computer Troubleshooting
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Lamda Computer Troubleshooting
I have searched old posts and have hit a dead end.
Is there a diagnostic for a Lamda Computer or do you know of a place that can test or rebuild one? I have tried contacting the address and number shown on the box with no reponse so far.
Image attached
Paul
Is there a diagnostic for a Lamda Computer or do you know of a place that can test or rebuild one? I have tried contacting the address and number shown on the box with no reponse so far.
Image attached
Paul
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Joined: Aug 2002
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From: South Texas
That is a not stock computer.
There is no telling how it's wired into the system, or how it is suppost to work, or if it ever worked in the first place.
Why not remove it and return it to stock? (Will you have trouble with smog?)
There is no telling how it's wired into the system, or how it is suppost to work, or if it ever worked in the first place.
Why not remove it and return it to stock? (Will you have trouble with smog?)
Inventor
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I would likely convert back to orginal if I new how the wiring should be for that (couple more years and no more emissions testing for me in Texas). This unit has a wiring harness that runs to the LH harness. Actually a clean addition and not butchered.
It did work and may still work but I suspect not 100%. I passed emissions last year but my AF ratio doesn't behave like it should.
It did work and may still work but I suspect not 100%. I passed emissions last year but my AF ratio doesn't behave like it should.
Race Car
Joined: May 2003
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From: SoCal
Those units (Mickey Mouse specials) just modified the air input to the LH unit
based on the O2 sensor voltage. e.g. if the O2 voltage was too high (rich),
it decreased the LH MAF sensor input.
It has these inputs:
1. +12 & ground
2. MAF input
3. LH MAF output
4. O2 sensor input
based on the O2 sensor voltage. e.g. if the O2 voltage was too high (rich),
it decreased the LH MAF sensor input.
It has these inputs:
1. +12 & ground
2. MAF input
3. LH MAF output
4. O2 sensor input
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From: Austin, Texas
just replace the O2 with a universal Bosch with the same number of wires: most likely a 3-wire unit ala factory. 
If your ignition is strong & your fuel pressure & vacuum are correct (30psi & 20" vac at idle), then you should be in good shape emission-wise.
If your ignition is strong & your fuel pressure & vacuum are correct (30psi & 20" vac at idle), then you should be in good shape emission-wise.
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Lamda Computer Troubleshooting (closed)
I finally received a reply from the folks in San Diego that built the unit. They sent me the instructions for the unit. I actually figured out the wiring by the time I had the paperwork but this at least tells how to adjust it. I am attaching for others use or reference.
I didn't really trouble shoot the unit but removed it and bridged the MAF input which is what this unit intercepts.
The car still does not have consistent air/fuel readings and seems to miss at higher RPM. Removing the Lamda didn't seem to help so on to other ideas.
Will start separate post and close this one. Thanks to those that replied.
I didn't really trouble shoot the unit but removed it and bridged the MAF input which is what this unit intercepts.
The car still does not have consistent air/fuel readings and seems to miss at higher RPM. Removing the Lamda didn't seem to help so on to other ideas.
Will start separate post and close this one. Thanks to those that replied.
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