I just finished my swap:
M52, OBD1 413 DME, SSSQuid stage 2 93 octane tune, S52 cams, all new hoses, rebuilt vanos etc etc.
It fires up and idles like a champ. Runs stellar, very responsive and strong, then within a few minutes when the car warms up and presumably enters closed loop, the throttle does not respond at all, the engine does not rev. You can hear some lean popping if you apply throttle but but the RPM doesnt increase. It basically stays at idle. I then have to coast to a stop, pop the hood, and unplug the oxygen sensor to get going again. Once the sensor is unplugged and the ecu us runbing in ipen loop again it runs perfect and pulls strong alll the way to 7200 rpm
I dont have a CEL wired up so I cant do a stomp test
What I have tried:
-known good MAF
-checked O2 heater circuit function, repaired circuit, but made no difference
What I am trying next
-different DME
-another new O2
-ensure no exhaust leaks exist from band clamps on headers
-confirm that i didnt mix up any wires on the extension harness i made.
Has anyone run into this problem? Its pretty obvious it has to do with the oxygen sensor but I wanted to check and see if there was anything else to check that may not follow traditiona logic , or if this is a commom problem with a known solution (say if the 413 DME is known to fail in this sort of way etc).
Thanks for any experience or insight
M52, OBD1 413 DME, SSSQuid stage 2 93 octane tune, S52 cams, all new hoses, rebuilt vanos etc etc.
It fires up and idles like a champ. Runs stellar, very responsive and strong, then within a few minutes when the car warms up and presumably enters closed loop, the throttle does not respond at all, the engine does not rev. You can hear some lean popping if you apply throttle but but the RPM doesnt increase. It basically stays at idle. I then have to coast to a stop, pop the hood, and unplug the oxygen sensor to get going again. Once the sensor is unplugged and the ecu us runbing in ipen loop again it runs perfect and pulls strong alll the way to 7200 rpm
I dont have a CEL wired up so I cant do a stomp test
What I have tried:
-known good MAF
-checked O2 heater circuit function, repaired circuit, but made no difference
What I am trying next
-different DME
-another new O2
-ensure no exhaust leaks exist from band clamps on headers
-confirm that i didnt mix up any wires on the extension harness i made.
Has anyone run into this problem? Its pretty obvious it has to do with the oxygen sensor but I wanted to check and see if there was anything else to check that may not follow traditiona logic , or if this is a commom problem with a known solution (say if the 413 DME is known to fail in this sort of way etc).
Thanks for any experience or insight
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