Riick
New Member
Hi, hoping someone on this forum can help. Been working on this for 2+ months and it's driving me crazy. I'm a car repair noob so I might have missed something simple. Any thoughts appreciated!
The car won't start because of a bad spark (sometimes weak, sometimes absent, occassionally pops out one nice spark).
First I thought it was the coil because of scorch marks, but a brand new coil didn't help.
Then I saw oil on a sensor in the distributor housing so I put in a used distributor (and a used ECU); worked great for one day.
Then I noticed that the engine block was getting 1 volt, which I traced to G1. Cleaned that off (and also G101 and G3) and it worked great for one day.
No oil on distributor sensors. Getting 12V at coil + and coil -. Getting 9.5V at signal wire. Getting 0.1V at engine block. Test light flashes when cranking (although it only flicks off for just an instant each cycle- is that normal?) I 'm testing the spark at the coil with spark tester gapped 1/8 inch.
Both days it worked I had made some of the ground wires wet while cleaning, but the negligible engine voltage even after things are dry makes me think that may not be it. I might try jumping wires to battery negative (from block, ICM heat sink, each of 4 ECU ground wires) just to confirm. What else can I try here?
The car won't start because of a bad spark (sometimes weak, sometimes absent, occassionally pops out one nice spark).
First I thought it was the coil because of scorch marks, but a brand new coil didn't help.
Then I saw oil on a sensor in the distributor housing so I put in a used distributor (and a used ECU); worked great for one day.
Then I noticed that the engine block was getting 1 volt, which I traced to G1. Cleaned that off (and also G101 and G3) and it worked great for one day.
No oil on distributor sensors. Getting 12V at coil + and coil -. Getting 9.5V at signal wire. Getting 0.1V at engine block. Test light flashes when cranking (although it only flicks off for just an instant each cycle- is that normal?) I 'm testing the spark at the coil with spark tester gapped 1/8 inch.
Both days it worked I had made some of the ground wires wet while cleaning, but the negligible engine voltage even after things are dry makes me think that may not be it. I might try jumping wires to battery negative (from block, ICM heat sink, each of 4 ECU ground wires) just to confirm. What else can I try here?