92 civic hatch using p28. engine is a 96 fully built turbo gsr.

update 9-8: not the ignitor or coolant temp sensor or the ECU/chip. i have found that as soon as the richening out happens, if i shut the car off and turn it back on while driving, the AFRs return to normal. if the car DIES/STALLS and i restart it, they will remain rich.

my car has been tuned by a reputable local tuner.

situation: car runs with the correct AFR's 85% of the time. doesnt matter how i am driving. However, sometimes my AFR's will drop to 9.9-10.0 and remain there no matter how i drive. after anywhere from 10-60 seconds the AFR's return to normal

normal idle is a steady 1100rpm. when AFR richens out, idle surges from 500-800rpm.

The car IS actually running rich. the sensor is not giving a false reading.

can some people please point me in the right direction to solving this problem.

thanks in advance, doug

 

bump

 

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bump, still cant figure this one out

 

my tuner is also completely stumped.

 

bump...what more info do u guys need? ask some questions.

 

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HERE WE GO:

MAP sensor is not the problem HOWEVER I DID FIND....

with the car off i have 12.6V at battery.
with car running normally i have 14.4V at the battery.
with the car running like **** (very rich AFR) I HAVE NO VOLTAGE AT THE BATTERY.

is this a faulty alternator or voltage 'regulator' i believe its called?

LMK please