How do you replace the Oil Pressure sender?
Melting Slicks
Joined: Aug 2001
Posts: 2,516
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From: Lockport NY
Re: How do you replace the Oil Pressure sender? (arbee)
You just want to be insulting and I won't Participate.
*Everybody* got insulting... :lol:
I think it had something like 4000+ hits... :thumbs:
- 1986 Original Owner -
Joined: Apr 1999
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From: North Yorkshire, England
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Re: How do you replace the Oil Pressure sender? (loflyin)
Man, I wish I could help. Aside from sending you a known good ECM to try, I don't think I can be of any real assistance.
Well this tie point we mentioned that comes through the closed Fuel Pump Relay contacts and/or the closed Oil Pressure Switch contacts routes 12V to the Fuel Pump and also the ECM. This is a red wire that goes to pin B2 of the ECM. The ECM monitors this line and will set a code 54 if this line is < 2V for 1.5 seconds since the last reference pulse. Normally if the Fuel Pump Relay were bad, you won't get the 2 second prime when switching the ignition on, so when you start cranking there isn't enough fuel to start the engine because even though you are now getting distributor reference pulses, the fuel pump relay is bad so the pump still isn't running. If the engine takes longer than 1.5 seconds for the oil pressure to build to 4psi to close the oil pressure switch and energize the fuel pump through the alternate path, the ECM will set a code 54, giving you some idea that your long crank times are probably due to a failed fuel pump relay.
I can't say that I've ever seen a code 41. The 42 is often left after a timing set. Have you cleared the codes and see which ones return? If so, I'd drop the ECM and reseat the connectors and PROM.
A wiring problem is still a likely candidate. If you look at your fuel pump relay, you may see that insulation has receded at the connector, exposing bare wire. This red wire coming out of the relay pin A is the one we are talking about everywhere. If this wire came into contact with another for more than 1.5 seconds, it would set a code 54 and you may not notice it in running or it may just seem like a miss as the fuel pump voltage drops. Of course this could happen anywhere this circuit runs. It goes to a lot of places. Check the easy stuff first. Insulation on the Fuel Pump Relay, then reseat ECM connectors and PROM.
Like I said, I won't be much help.
What does "low voltage at the fuel pump mean?
I can't say that I've ever seen a code 41. The 42 is often left after a timing set. Have you cleared the codes and see which ones return? If so, I'd drop the ECM and reseat the connectors and PROM.
A wiring problem is still a likely candidate. If you look at your fuel pump relay, you may see that insulation has receded at the connector, exposing bare wire. This red wire coming out of the relay pin A is the one we are talking about everywhere. If this wire came into contact with another for more than 1.5 seconds, it would set a code 54 and you may not notice it in running or it may just seem like a miss as the fuel pump voltage drops. Of course this could happen anywhere this circuit runs. It goes to a lot of places. Check the easy stuff first. Insulation on the Fuel Pump Relay, then reseat ECM connectors and PROM.
Like I said, I won't be much help.
