so for the past 4 months I've been having intermittent starting problems with my 93 sc400. I'll go to start it sometimes and it just won't fire up, no problem cranking. I can usually wait a day or so and it will fire up like nothing was ever wrong with it. Since last week I have had zero luck getting it to start at all now. Same
thing cranking fine.
Here's everything I've done so far to see if I can fix the problem:
replaced fuel pump and fuel pump ecu
replaced both camshaft position sensors
replaced crankshaft position sensor
i know for sure it's getting fuel. Pulled the plug to test for spark and it is not getting any spark. Tested igniters and they are fine
it is currently giving me Obd codes 12 and 24.
When i I changed the crank sensor, the old one had a bit of oil on it and the plug (from seeping oil pan), not sure if it was enough to cause any sort of shorting issue. There was also some kind of black build up on the old sensor. Tried to clean out that opening the best I could, but may be more grime In There than I thought?
Check engine light comes on when ignition is switched to on, so the ECU is not totally dead.
Tried tapping the ecu, and fuse box, as well as really clean out the crank sensor hole. Still no spark. About a week ago I installed imf headers on it. Started fine before a jacked it up and started fine once I installed the headers. Started it with open headers and drove it around my block. Had issues idling but I'm guessing that's because the downstream 02 sensors weren't getting any input. Stalled a few times and started back up. Went to start it up again 3 days later and it just will not get any spark. Cranks fine.
I'd imagine if it jumped timing it wouldn't be enough that it wouldn't still run. And either way, it should still be getting spark right?
im completely lost on this thing right now.
Any more ideas?
thing cranking fine.
Here's everything I've done so far to see if I can fix the problem:
replaced fuel pump and fuel pump ecu
replaced both camshaft position sensors
replaced crankshaft position sensor
i know for sure it's getting fuel. Pulled the plug to test for spark and it is not getting any spark. Tested igniters and they are fine
it is currently giving me Obd codes 12 and 24.
When i I changed the crank sensor, the old one had a bit of oil on it and the plug (from seeping oil pan), not sure if it was enough to cause any sort of shorting issue. There was also some kind of black build up on the old sensor. Tried to clean out that opening the best I could, but may be more grime In There than I thought?
Check engine light comes on when ignition is switched to on, so the ECU is not totally dead.
Tried tapping the ecu, and fuse box, as well as really clean out the crank sensor hole. Still no spark. About a week ago I installed imf headers on it. Started fine before a jacked it up and started fine once I installed the headers. Started it with open headers and drove it around my block. Had issues idling but I'm guessing that's because the downstream 02 sensors weren't getting any input. Stalled a few times and started back up. Went to start it up again 3 days later and it just will not get any spark. Cranks fine.
I'd imagine if it jumped timing it wouldn't be enough that it wouldn't still run. And either way, it should still be getting spark right?
im completely lost on this thing right now.
Any more ideas?