error code 54
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Joined: Jun 2002
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From: Colonial Heights, VA
Car: 85 Iroc-Z
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 10-bolt 3.42
error code 54
i just recently purchased an 85 iroc-z. 305 TPI 700r4. the only real problems i noticed with it were that when you first started it, it would rev to 1500-2000 rpms for 3-7 seconds and idle down. Then when it idled, it would idle kindof rough. Not too rough, but just rough enough to make the car shake. (~750-950rpms) It seems to drive fine though. I drove it around for about 4 or 5 hours last weekend and 2 times when i started it up, the check engine light came on a couple seconds after it started and stayed on. The car idled, ran, drove just like before except the check engine light was on. I pulled the code and it is code 54. which, i believe is low voltage at fuel pump, or something with the fuel pump, relay, or oil pressure switch. I did a search and the only relevant info i found was on v6's. Regardless, i read through all the articles but figured i'd post here to see if anyone has any ideas specific to a v8. i didn't know if troubleshooting would be much different than a v6.
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Joined: May 2002
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The "reving" up on start is normal for that car, especially when cold, the cold start injector gives it an extra squirt of gas to aid in cold starting and makes it rev up a bit. The rough idle should be fixed with a good tune up, plugs, wires, cap, rotor and timing set to 6 deg BTDC.
code 54 = Low fuel pump voltage. Check the input and output voltages on the fuel pump relay, with a digital VOM.
~M~
code 54 = Low fuel pump voltage. Check the input and output voltages on the fuel pump relay, with a digital VOM.
~M~
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Joined: Jan 2000
Posts: 19,660
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85,
Welcome Aboard!
The troubleshooting is not a lot different than for a V-6 (or any other engine, for that matter).
I'm thinking that Morley is right on. Since you just got the car, treat it like no maintenance has ever been done. Unless you have a reciept showing what was done an when, assume nothing. Start with the ignition. Clean the throttle body and idle air control passages. Plan to change all fluids, repack the wheel bearings, lube the steering and suspension bushings, body mounts, seals, brake cables, inspect the brakes, change the oxygen sensor, replace filters, hoses, belts, flush the cooling system, etc. Once all the maintenance items for a car with that mileage are up to date, you can start troubleshooting any remaining problems.
As for the fuel pump voltage, the relay is the likely suspect.
Welcome Aboard!
The troubleshooting is not a lot different than for a V-6 (or any other engine, for that matter).
I'm thinking that Morley is right on. Since you just got the car, treat it like no maintenance has ever been done. Unless you have a reciept showing what was done an when, assume nothing. Start with the ignition. Clean the throttle body and idle air control passages. Plan to change all fluids, repack the wheel bearings, lube the steering and suspension bushings, body mounts, seals, brake cables, inspect the brakes, change the oxygen sensor, replace filters, hoses, belts, flush the cooling system, etc. Once all the maintenance items for a car with that mileage are up to date, you can start troubleshooting any remaining problems.
As for the fuel pump voltage, the relay is the likely suspect.
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