New F w/ a Couple of Squawks: Squawk #2 - Erratic Fuel Flow

[bigmo]

Keeping these separate issues separate.

Squawk #2 is erratic or 0 on the fuel flow (all other values steady/consistent). A/c equipped with a JPI EDM 930. According to logs, the installed transducer is a JPI 201.

In flight the fuel flow is wildly erratic, or just goes to 0 FF. No rhyme or reason, it never seemed to give anything near realistic readings. Sometimes it would stay on 0 FF for an hour, then bounce around all over the place for minutes, then go back to 0 FF.

Suspecting a loose connection vs a bad unit???

I'll pull the cowling tomo and check the one connection that should be just off the unit (I think it's a three pin). 

Any other obvious troubleshooting to check? 

My glare shield does come off easily and the EDM is at the top of my panel, so I *think* I can see the back of it pretty easily. Wasn't sure if there was one big master harness on it, or sensors all came to it independently.

I saw a couple of threads here where guys pull the 201 transducer, clean it out with carb cleaner and reinstall. That seems like a unit that's giving normal-ish readings and the flow wheel is gummed up. That does not seem like my issue.

Luckily, a new JPI 201 is only $325, so not a terrible repair if that's the problem.

Am I on the right troubleshooting path? Anything else to check?

 

 

[KSMooniac]

Could be the 3-pin Molex connector near the transducer, or the transducer itself. Start there looking for bad crimps or compromised wires.

Sent from my motorola edge plus 2023 using Tapatalk

[Yetti]

Erratic sounds like wiring.    Grounds should all be shiny bright.   There should be a ground strap from engine to the firewall.   Check the battery ground in the Coms Bay Port side behind the wing.    

[bigmo]

Fixed! I decided to just do a proper job. Good gravy, getting to it was not easy and dropping the exhaust would have helped a lot. Not sure if it was the cleaning of the transducer itself (it looked immaculate) or cleaning the connections with contact spray and reseating them 10x each. Regardless, squawk is fixed. Once I was that far in, I probably should have just replaced the transducer as it's $325. The unit only has 500 hours on it, but it's pushing 15 years old.