Stupid question regarding inertia switches.

Aaron · July 16, 2008

Was putting a parking aid module in a 06 SD today, and got to thinking to myself. If you have one of these trucks that's in a bad enough accident that it trips the inertia switch, should you put injectors in your estimate? Low fuel pressure killing injectors? Anyone? Bueller? Bueller?

Discuss.

Just a rambling semblance of a thought that entered my mind, likely heat induced. Just curious what others think.

Joey Kaylor · July 16, 2008

they have inertia switches? i wasnt aware of Ford installing them on the diesel trucks.

edit: sombitch they did put one on. i would assume it would illuminate a message though?

Alex Bruene · July 16, 2008

I believe one of the many calibration updates we've had in the past had strategy to cause the engine to stall immediately after starting if the inertia switch was open. I don't think I would be concerned about the injectors.

Keith Browning · July 16, 2008

Any vehicle with an electric fuel pump must have an inertia fuel cut off switch. Now, as far as the 6.oL goes, we all know that these things can run with a dead fuel pump and sometimes pretty good! We had a stock Excursion once that actually ran but did not accelerate at all. I diagnosed a defective inertia switch. If the PCM is now supposed to shut the engine off if it detects a primary fuel circuit that might be a good thing, but I have seen trucks recently that had bad fuel pumps or faulty fuel pump relays that were still running... driven to the dealer in fact and the code for the secondary fuel pump circuit was in the PCM.

Brad Clayton · July 17, 2008

I've come across quite a few bad inertia switches on these, which is weird to think about considering how long they have been around on gassers with very few problems (late '80's Escort excluded from that statement).

Anyone looked at an '09 Flex yet? No inertia switch in this vehicle!!!! It gets a fuel energize command from the RCM module, what will they change next? /forums/images/%%GRAEMLIN_URL%%/shrug.gif

Aaron · July 17, 2008

I had a 2009 MKS for a no crank/no start about 3 weeks ago - manufacturer plated.

FYI - Without brakelights, this car won't start.

FYI - the brakelight switch interchanges with....every damn thing almost.

Me and Shlep were on that thing like a hindu on a chicken when it came in, to see if it had the Direct Injection Gasoline engine...but alas, N/Aspirated 3.7L

Mekanik · July 18, 2008

I had a very early 03 6.0l that came in for lacking power a long time ago. This was like the 2nd 6.0l I ever worked on. This truck got wrecked, fixed in a body shop and back to the customer with a tripped inertia switch. (it also had a sticking turbo). After a new turbo and re-setting the inertia switch the truck left and then came back a couple weeks later because it had a bad injector. I was the only tech that worked on the truck for the next 5 years and it didn't have any other injector problems.

My personal opinion... If it runs good, just warn the customer that there could have damage to the injectors.