Truck randomly started bucking and rough idle, immediately scanned for codes on my Insight and came up with P0279 cylinder 7 injector low circuit. Quick google search brought up 4 main things. Bad FICM, loose connections to FICM, chaffed injector harness, or bad spool valve on the injector. I'm going to go ahead and rule out the bad FICM, volts were 48v battery volts were 13.4-13.8. Havnt got a chance to check anything else out cause I had to work but I wanted to ask before I dig into this thing tomorrow. Off the top of my head I know the two screws in the intake that hold the bracket to the FICM, the two plastic holes the screws go in are broke so that bracket really is just connected to the FICM. Can that cause the FICM to bounce around and maybe a connection came loose? I kinda figured if that was the case I'd be getting more codes for other cylinders.
Other question, what all needs to be removed off the engine to thoroughly inspect the injector harness for chaffing? Probably obvious question here but oh well, if the black plastic wrap around the harness isn't burnt through to the actual wires is it safe to say that the wires are good still?
Also what's weird is I started the truck up 45 minutes later and it ran fine, cleared the code, went to the bank and around and coming back to the house right on the same road it did it first it started bucking again and the code came back. Thanks for the help.

 

Chances are the clips that hold the connection together snapped off most Zip tie them back on with no Issues, double check the pins in there too make sure they are not bent put a little dio grease on the out side and slip together

 

You're talking about the connections to the FICM?

 

Oh yes the FICM, 1 of mine broke and the other two are good or waiting to be broke

 

And just putting a zip tie around the connector fixed it? Haha.

 

Ya ,you have to fish it thru the wires around the Ficm and zip it, the good thing was I have a bunch of zip ties for like 5 bucks Rather than Hundreds for a replacement connector or harness

 

ZipTie trick works great, actually isn't a bad idea to just do it regardless if the FICM connectors make a solid click or not.

Might not be a bad idea to pull Injector 7 and see if the coils aren't burnt.

Josh

 

Thanks guys. Keeping my fingers crossed it's that easy or a fix, probably not but one can hope.
If this don't work I'll try swapping injectors. If it were the injector wouldn't I be seeing smoke? It doesn't chooch at all.

 

I'm giving you the good luck sign LOL , It's an easer fix than Inject , but Both will produce smoking how's the real cold start?

 

Haha thanks
My cold starts are really pretty good.

 

What are you guys running the zip tie through to get it around the connector?

 

Just wraps clear around. Feed it between the wires.

Josh

 

Oh so I guess you guys are peeling off the tape on the harness and feeding it through the actual wires? I just kinda ran them diagonal underneath the connectors. Didn't start first time I cranked, FICM volts were fine. Turned it off tried again and it started up. Sounded ****ty at first but it's smoothed out now. about to take it for a drive.

 

Possibly yours is wrapped more, don't know. Always just feed the zip tie around and cinch it snug.

Josh

 

Yeah I guess mine is wrapped pretty well, can't get to any of the wires without peeling tape off. Driving fine so far. Gonna keep driving it until it reaches operating temp and see what happens.