Air pump fuse melted
07-21-2019 | 08:06 AM
#16
Administrator
Joined: Nov 1998
Posts: 70,853
From: Hell was full so they sent me to NJ
Re: Fuse melting
Generally a good idea to continue in the earlier thread, rather than start a new one, so people know all the facts. I'll merge this with the earlier thread.
As explained already, since you don’t have a catalytic converter, you have no need for the AIR system. But you do need a good fuse in the AIR pump relay circuit, to avoid the SES light and the code. You indicated you were looking to have it tuned. Just have AIR deleted and you don’t have to do anything else. If you want to repair the circuit anyway, easiest thing to do would be to complete the circuit by jumpering an in-line fuse to the correct wires under the fuse block.
You can download a free copy of the 1993 factory service manual, which includes all the wiring diagrams.
https://www.mediafire.com/?40mfgeoe4ctti
As explained already, since you don’t have a catalytic converter, you have no need for the AIR system. But you do need a good fuse in the AIR pump relay circuit, to avoid the SES light and the code. You indicated you were looking to have it tuned. Just have AIR deleted and you don’t have to do anything else. If you want to repair the circuit anyway, easiest thing to do would be to complete the circuit by jumpering an in-line fuse to the correct wires under the fuse block.
You can download a free copy of the 1993 factory service manual, which includes all the wiring diagrams.
https://www.mediafire.com/?40mfgeoe4ctti
Last edited by Injuneer; 07-21-2019 at 08:16 AM.
07-21-2019 | 08:12 AM
#17
Thread Starter
Registered User
Joined: Feb 2019
Posts: 32
Re: Fuse melting
Generally a good idea to continue in the earlier thread, rather than start a new one, so people know all the facts. I'll merge this with the earlier thread.
As explained already, since you don’t have a catalytic converter, you have no need for the AIR system. But you do need a good fuse in the AIR pump relay circuit, to avoid the SES light and the code. You indicated you were looking to have it tuned. Just have AIR deleted and you don’t have to do anything lse. If you want to repair the circuit anyway, easiest thing to do would be to complete the circuit by jumpering an in-line fuse to the correct wires under the fuse block.
You can download a free copy of the 1993 factory service manual, which includes all the wiring diagrams.
https://www.mediafire.com/?40mfgeoe4ctti
As explained already, since you don’t have a catalytic converter, you have no need for the AIR system. But you do need a good fuse in the AIR pump relay circuit, to avoid the SES light and the code. You indicated you were looking to have it tuned. Just have AIR deleted and you don’t have to do anything lse. If you want to repair the circuit anyway, easiest thing to do would be to complete the circuit by jumpering an in-line fuse to the correct wires under the fuse block.
You can download a free copy of the 1993 factory service manual, which includes all the wiring diagrams.
https://www.mediafire.com/?40mfgeoe4ctti
07-21-2019 | 08:45 AM
#18
Administrator
Joined: Nov 1998
Posts: 70,853
From: Hell was full so they sent me to NJ
Re: Air pump fuse melted
Repeating what was posted earlier, the electric AIR pump only runs for 2 or 3 minutes at engine startup. The pump injects air into the exhaust stream. That helps burn the excessive unburned hydrocarbons (HC) in the exhaust, resulting from the very rich A/F ratio used for cold start. Burning the HC reduces emissions, and helps the cat and O2 sensors heat up faster. The cat and O2 sensors have to get hot before they start to work. After 2 or 3 minutes, the AIR pump shuts off, and is not used or required.
Deleting the AIR system has no effect on the way the engine runs, except maybe taking a few extra seconds for the O2 sensors to heat up and allow the ECM to enter closed loop. You would never notice anything.
You indicated you are going to run headers. On a 93 with headers, particularly long tubes, it is recommended that you convert to “heated” O2 sensors. All other years left the factory with heated O2’s, 93 did not.
From Shoebox:
http://shbox.com/1/heatedsensor2.jpg
Deleting the AIR system has no effect on the way the engine runs, except maybe taking a few extra seconds for the O2 sensors to heat up and allow the ECM to enter closed loop. You would never notice anything.
You indicated you are going to run headers. On a 93 with headers, particularly long tubes, it is recommended that you convert to “heated” O2 sensors. All other years left the factory with heated O2’s, 93 did not.
From Shoebox:
http://shbox.com/1/heatedsensor2.jpg
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