[Diy_efi] 1984 t-bird eec problems

Sat Dec 14 20:47:29 GMT 2002

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Hello list,
Havn't been here for 4 or 5 years.  Nice to be back again.
I recently bought a 1984 T-Bird.  3.8L v-6.  I'm having off idle drivability 
issues.
Under light power and even at idle, engine is stumbling.  I tapped into the 
EEC and 
monitored o2 voltages while driveing.  During stumbles voltages drop from 
from 
approx. .7 to .1 volts, quickly.  While tracing o2 signals thru EEC I noted 
that only the right bank actually goes anywhere.  The left bank signal 
arrives at J1 pin 29 passes thru a 22Meg resistor and dead-ends.  The right 
bank signal arrives at J1 pin 43 passes thru 22 Meg and ends at pin 2 on an 8 
pin DIP.
Is this normal?  Is it possible that the EEC is incorrect unit?  It obviously 
is NOT the original.  Has bone-yard (yellow paint) markings indicating 1984 
T-Bird.
  Identification on unit is:        EEC IV F1
  Under barcode:                       A52
then:                       E4VF-12A650-F24
in corner:                       SF
I couldn't find schematic for this unit thru web browsing.  

After getting car, I determined that the EGR was stuck and the vac solenoid 
to EGR had corroded contacts and wasn't actuating.  I corrected the problems. 
 Still got
error 31 after clearing codes and performing KOEO.  I changed EGR sensor and 
still get same.  Measuring resistance per book gives range of 3.5Kohms to 75 
ohms.
The 75 ohms is below spec. of 100.  Tried different (new) sensor with same 
readings.Is this normal?  Any thoughts? Also performing KOER, gives engine 
codes
of 13, 31, 33.  I performed diagnostics on EGR system according to book and 
arrived at EEC replacement solution.  I'm a bit low on cash, and would hate 
to purchase re-manufactured EEC if this is not the root cause.
Please help.
Regards,
Adam Kojoian
Corvallis, OR.

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<HTML>Hello list, 
Havn't been here for 4 or 5 years.&nbsp; Nice to be back again. 
I recently bought a 1984 T-Bird.&nbsp; 3.8L v-6.&nbsp; I'm having off idle drivability issues. 
Under light power and even at idle, engine is stumbling.&nbsp; I tapped into the EEC and 
monitored o2 voltages while driveing.&nbsp; During stumbles voltages drop from from 
approx. .7 to .1 volts, quickly.&nbsp; While tracing o2 signals thru EEC I noted that only the right bank actually goes anywhere.&nbsp; The left bank signal arrives at J1 pin 29 passes thru a 22Meg resistor and dead-ends.&nbsp; The right bank signal arrives at J1 pin 43 passes thru 22 Meg and ends at pin 2 on an 8 pin DIP. 
Is this normal?&nbsp; Is it possible that the EEC is incorrect unit?&nbsp; It obviously is NOT the original.&nbsp; Has bone-yard (yellow paint) markings indicating 1984 T-Bird. 
&nbsp; Identification on unit is:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; EEC IV F1 
&nbsp; Under barcode:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; A52 
then:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; E4VF-12A650-F24 
in corner:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SF 
I couldn't find schematic for this unit thru web browsing.&nbsp; 
 
After getting car, I determined that the EGR was stuck and the vac solenoid to EGR had corroded contacts and wasn't actuating.&nbsp; I corrected the problems.&nbsp; Still got 
error 31 after clearing codes and performing KOEO.&nbsp; I changed EGR sensor and still get same.&nbsp; Measuring resistance per book gives range of 3.5Kohms to 75 ohms. 
The 75 ohms is below spec. of 100.&nbsp; Tried different (new) sensor with same readings.Is this normal?&nbsp; Any thoughts? Also performing KOER, gives engine codes 
of 13, 31, 33.&nbsp; I performed diagnostics on EGR system according to book and arrived at EEC replacement solution.&nbsp; I'm a bit low on cash, and would hate to purchase re-manufactured EEC if this is not the root cause. 
Please help. 
Regards, 
Adam Kojoian 
Corvallis, OR.</HTML>

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