1988 Chevy Truck No spark

tdecker85087 · Posted at Sat Nov 07, 2009 2:53 pm

Electrical problem
1988 Chevy Truck V8 Four Wheel Drive Automatic 178000 miles

There is no spark at the plugs even after replacing ignition module, dist. cap, rotor, and ECM. There is spark at the coil. The main reason why I changed the ECM was ALDL gives no response when a scan tool is connected but does flash a code 12 with the servise engine light (still nothing with the scan tool connected) This all started when in the morning I started the drove it 10 miles stopped got gas started right up drove it another 10 miles to a store came out 15 minutes later and it would just crank and not fire up. I would appreciate any suggestions of other areas to check.

rasmataz · Posted at Sat Nov 07, 2009 3:10 pm

Hi tdecker85087 and TY for the donation

Check and test the distributor pick-up coil and air gap-also double check the cap and rotor contacts-if there's spark out of the coil-it should have spark at the plugs if cap and rotor good it has to make it out there to get to the plugs

DTC's

12
No Distributor pulses

13
Oxygen sensor

14
Coolant Temp sensor circuit

15
Coolant Temp sensor circuit

21
Throttle Position Sensor

22
Throttle Position Sensor

23
Manifold Air temperature sensor

24
VSS (Vehicle Speed sensor)

25
Manifold Air temperature sensor

32
EGR system

33
MAP sensor or MAF sensor depending on engine

34
MAP sensor or MAF sensor depending on engine

35
Idle Air Control Valve

36
MAF Burn-off circuit

41
No Distributor pulses, cylinder select error

42
Electronic Spark Timing or Bypass fault

43
Electronic Spark Control fault

44
Lean exhaust

45
Rich exhaust

46
VATS system fault

51
PROM fault

52
CALPAK fault

53
System over-voltage

54
Fuel pump circuit

55
ECM fault

61
Oxygen sensor fault (degraded sensor)