Check Engine light started coming on my 1991 Sovereign.... VCM throwing out Fuel Failure 29

Most everyone is saying to start with the battery. However, the battery is brand new 2 months old. the new battery cranks out around 740 cold amps. Must it be over 800?

The only other thing is..... I had a engine technician perform a Fuel Injection Throttle Body chemical cleaning last week (which included an additive added to the gas tank, I only had less than a half tank of fuel at the time). I wonder does this have something to do with it.... a little befuddled.

 

You need a copy of the engine management .pdf, it gives you all the info on the fuel fail codes and a flowchart to hopefully correct it.

Page 38 refers to the FF29. Most likely scenario if your battery is good (and it sounds like it is) you have a bad connection or a dirty/corroded ground.


here you go, courtesy of motorcarman (Bob)


http://www.mediafire.com/file/szzac3...stic+Guide.pdf


Larry

 

Ok.… One more thing:

About 3 hours before this, I spent about 30-40 minutes getting the audio settings adjusted to my liking, with the engine off and ignition switch in AUX. When I started the car it cranked up quick to apparent issues.

Could this time have drained the battery enough to cause 29 failure. If so, how can I turn the CHECK ENGINE light back off?

 

Disconnect the battery negative terminal for 30 secs, that will clear the code - BUT make sure you have radio code first because it will reset the radio too.

Larry

You should get the pdf I mentioned earlier, print it out and give it a good read - it is a huge resource for owners of these cars.

Larry

oh ...and Merry Xmas!

 

Well, I disconnected the battery ground and reconnected it... and the check engine light went away for now. I guess I drained it during the time the engine was not running while radio was on...

 

I will certainly print the pdf... thanks Larry.