Fuel cutoff relay circuit? - Third Generation F-Body Message Boards

Tyler0413 · 10-31-2009, 12:00 PM

I have an 89 iroc and im getting code 22 when i use the computer. The car will occasionally turn over but will only stay running for a second or two. I just recently replaced the throttle position sensor and the mass air, the code says fuel cutoff relay circuit, but i have no idea where that is. can anybody help me as to where it is or whether or not this is even the problem?

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bjm1206 · 10-31-2009, 01:35 PM

When you turn your ignition on key on engine off do you hear a click near the firewall under the hood. If not your relay is bad it is the two black squares in the corner on the drivers side. Not quite sure which one is fuel but they were cheap enough mines a 20 year old car so i replaced them both

RBob · 10-31-2009, 04:23 PM

Quote:

Originally Posted by Tyler0413

I have an 89 iroc and im getting code 22 when i use the computer. The car will occasionally turn over but will only stay running for a second or two. I just recently replaced the throttle position sensor and the mass air, the code says fuel cutoff relay circuit, but i have no idea where that is. can anybody help me as to where it is or whether or not this is even the problem?

Code 22 is a TPS low malfunction. Check that the TPS voltage at key-on, engine-off is 0.54 volts. You can see this on your scan tool. The TPS should be slotted to be adjustable.

Note that there is no such thing as a fuel cut-off relay on your '89.

RBob.

mikeand7 · 11-04-2009, 03:55 PM

Hey guys. I'm working with Ty on this and I don't think the problem has anything to do with the error code. I recharged the battery and the code went away. The car stopped running suddenly when we were driving it. It would not restart. Prior to this it had a few instances where it would not restart right away, but if you let it sit for 10 minutes or so it would then restart. Now, if it sits for a few days, it will start and fire, but only for a few seconds and then it dies and will not start, unless you let it sit for several days and it will do the same thing. I have checked and replaced the fuse by the battery, the fuses that relate to the fuel pump and injectors. I unplugged the fuel pump relay and when the key is turned on I can not hear the fuel pump run. When it is plugged back in I hear the fuel pump run for a few seconds while it builds up pressure and I can hear it continue to run after trying to start it for the same amount of time. So, I don't think it is the fuel pump. It seems to be getting spark because it will start (every few days) it just won't keep running. Seems like it is not getting gas, but that is just a guess.

Any ideas? Please.......

vetteoz · 11-04-2009, 05:47 PM

Quote:

Originally Posted by mikeand7

it will start and fire, but only for a few seconds ....... Seems like it is not getting gas, but that is just a guess.
.

The oil pressure switch at the rear of block that runs the fuel pump could be bad.
Activates @ 4psi and runs pump in place of FP relay

Also the ECM has to see the pressure switch come on line while cranking ;
if it doesn't it won't fire the injectors

RBob · 11-04-2009, 09:42 PM

Quote:

Originally Posted by mikeand7

Hey guys. I'm working with Ty on this and I don't think the problem has anything to do with the error code. I recharged the battery and the code went away. The car stopped running suddenly when we were driving it. It would not restart. Prior to this it had a few instances where it would not restart right away, but if you let it sit for 10 minutes or so it would then restart. Now, if it sits for a few days, it will start and fire, but only for a few seconds and then it dies and will not start, unless you let it sit for several days and it will do the same thing. I have checked and replaced the fuse by the battery, the fuses that relate to the fuel pump and injectors. I unplugged the fuel pump relay and when the key is turned on I can not hear the fuel pump run. When it is plugged back in I hear the fuel pump run for a few seconds while it builds up pressure and I can hear it continue to run after trying to start it for the same amount of time. So, I don't think it is the fuel pump. It seems to be getting spark because it will start (every few days) it just won't keep running. Seems like it is not getting gas, but that is just a guess.

Any ideas? Please.......

Yes, being an '89, if stock it has Multec injectors. If the injectors as stlil the originals replace them. The Multecs short out and will cause this exact issue.

Seriously, if the injectors are the original, or replacement Multecs, pull them out and toss 'em in the trash can. Replace them with a set of Bosch injectors for the correct engine displacement (19# or 22#).

The only other suggestion is to check the battery to engine and battery to body grounds. With the odd TPS code popping up this is an area that should be looked at.

RBob.