V8 STARTUP - what is happening?

[Banman]

Today, I initiated the engine of the v8 vehicle to move it out of the garage. After disconnecting the trickle charger, I attempted to start the engine, but it took three times longer than normal. Furthermore, the engine exhibited irregular behaviour, including rough idling, stuttering, and failure to increase in RPM when the throttle was applied. It seemed as if the engine was not functioning properly on all eight cylinders and was at risk of stalling. I deactivated and then rebooted, but the same issue persisted. Due to my laptop's power failure, I was unable to connect the vaccom. As a substitute, I connected a basic one and saw the pictures shown below. After restarting the automobile, it functioned flawlessly as if no previous issues had occurred, running smoothly and pleasantly.
According to my friend, the issue might have been caused by a faulty secondary air pump relay. I found the relay, cleaned it, and it functioned properly. I then drove the vehicle for a drive and it operated smoothly, just as it usually does. I have purchased an additional relay as a precautionary measure. However, I would appreciate any suggestions on the contacts and have conducted a vagcom output test on it.

[Samuraisaint]

Verify the voltage level since the battery may be seeing a decline in performance.

[Banman]

The battery voltage was satisfactory, since I had just removed it from the charger and the starter operated at a high speed. However, I will monitor it closely in the future.

[Racerse]

Have you indeed quantified the voltage? A battery that is nearing the end of its lifespan may not retain a sufficient amount of electrical charge, even after being connected to a battery tender.

[Banman]

No, I did not. I had a moment of confusion, but it seemed like there was a problem with the electrical power. I saw that the LED cluster on the dashboard was pulsating, becoming bright and then somewhat dimmer, which was out of the ordinary. After I cleaned the secondary air pump relay, I saw a group of additional relays that I have heard others talk about replacing. Could these relays be related to the issue?

[Banman]

Is there anybody who has a key to the relays shown below? I have already cleaned the relay indicated by the black arrow located at the bottom left of the image. I am curious about the other relays.

[Mututing]

Is it possible that the problem is related to the starting motor?

[Banman]

I am sceptical about it. The automobile did eventually start, although it took a longer time than usual. The problems arose after the car had started.

[Banman]

Today, I replaced the battery with a fresh one. I saw that the earth lead, where it is fastened to the chassis, was significantly rusted, so I proceeded to clean it. The starting motor now rotates at a much higher speed. I also performed maintenance on the contacts of the remaining 614 relays. I saw heat marks on them, but when removing the body surround, I found that their condition was not significantly deteriorated.
Does anybody has a method for identifying the relays?

[Banman]

Please provide the identification for these three relays.

[Adv3nture]

Is the fuse/relay board situated on the rear bulkhead?

[Banman]

The speaker is located on the right side.

[Adv3nture]

I own a Spyder, which I believe is the same board, except it is situated in a different location.
Based on the image you provided:
The secondary air pump fuse is labelled as "A". (The shot only displays a portion of it)
Relay 614 functions as the power supply relay for the Engine Control Module.
2- Unoccupied
The relay with the number 373 is a kind of relay used for starting a device or system.
Another starting relay option is the 4-partial covered relay.
The relay with the number 373 is responsible for controlling the Secondary Air Injection Pump.
Relay 614 is a power supply relay for the engine component.
The automobile has vacancies on the 7th, 8th, and 9th positions.

Hopefully, this information proves beneficial.

[Banman]

Thank you.