No-start, got a couple quick questions

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93_95

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My '93 died at work-- it ran perfectly when I came in this morning, but when I went to lunch it wouldn't start. It cranks fine, it just won't fire up.

I did notice that the tach needle wavers around 350-400 rpm while it's cranking, just like usual. Does this mean it's safe to rule out the ignition system? I know the crank/cam sensors are the most common culprits, but I assume the tach would stay at zero if the PCM couldn't figure out when to fire the plugs. I also wiggled the harnesses for the heck of it, no dice.

I want to try swapping the fuel pump & horn relays, but I don't have my owner's manual with me. Does anyone know which is which?

Thanks in advance!
 
First check your fuel pressure at the fuel rail. If OK, R&R at Cam Sensor, then Crank sensor. If still no go, R&R crank sensor connector; then Cam Sensor Connector.
 
Thanks guys.. I went to check those connectors but decided to check for codes first, and got a 542 (fuel pump circuit open). Swapped out the relay and it fired right up!
 
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