Hey mudders, trying to diagnose a no start, no CEL, does crank issue.
At first I thought it was fuel delivery related but now I’m stumped.
I am able to get it running if I force the fuel pump to run via the diagnostic port (FSM calls it the check connector) by jumping the FP and B+ terminals. This makes me think the issue is with the Circuit Opening Relay but… when I try to start is normally without forcing the connection to the fuel pump as described above I DO hear the relay click on / off so I think it is actually working. I can’t find my multimeter but I’ll go out and repurchase if need be - pretty broke right now.
Does it sound like it’s the COR even though I can hear it (and feel it, I held the relay in my hand while a partner tried to start it) engage upon trying to start and stopping?
Could it in any way be related to the Air Flow Meter? The connection seems secure on the AFM and I think it wouldn’t be the issue because it seems to be working fine once I get it running by forcing the fuel pump to run. If it was the AFM I imagine the engine wouldn’t start or stay running with the fuel pump connection forced since there wouldn’t be air to allow the engine to keep working.
I can order a new COR from rockauto if I have to but I don’t want to without knowing for sure it’s bad. I can’t afford to throw parts at the problem so I’m trying to be methodical in my diagnosis.
Any ideas?
At first I thought it was fuel delivery related but now I’m stumped.
I am able to get it running if I force the fuel pump to run via the diagnostic port (FSM calls it the check connector) by jumping the FP and B+ terminals. This makes me think the issue is with the Circuit Opening Relay but… when I try to start is normally without forcing the connection to the fuel pump as described above I DO hear the relay click on / off so I think it is actually working. I can’t find my multimeter but I’ll go out and repurchase if need be - pretty broke right now.
Does it sound like it’s the COR even though I can hear it (and feel it, I held the relay in my hand while a partner tried to start it) engage upon trying to start and stopping?
Could it in any way be related to the Air Flow Meter? The connection seems secure on the AFM and I think it wouldn’t be the issue because it seems to be working fine once I get it running by forcing the fuel pump to run. If it was the AFM I imagine the engine wouldn’t start or stay running with the fuel pump connection forced since there wouldn’t be air to allow the engine to keep working.
I can order a new COR from rockauto if I have to but I don’t want to without knowing for sure it’s bad. I can’t afford to throw parts at the problem so I’m trying to be methodical in my diagnosis.
Any ideas?