[Mobile-Portable] HF amp causing false error codes in my auto computer.

[Ron Youvan]

   Hi  Ray W4BYG:

    First put a tin foil hat on your head, ground it.
Then put a tin foil hat on your  "Secondary Air Injector valve, ground it.

   Hi  Hi  Hi  .    (you are the guy that asked for comments)

> I have been running mobile off and on for close to 50 years.  I have
> dealt with many automobile RFI and power related problems.  This one has
> me a little stumped.

> I have a rather complex HF and VHF/UHF mobile installation.  It consists
> of an FT100D driving an Ameritron 500 watt amp, driving a 7 1/2'
> Hustler, utilizing the high power 20 meter coil.  The antenna is mounted
> on top of the car top carrier of my 2006 Toyota 4Runner. The 4Runner has
> a 4.7 liter V-8.

> I also run 150+ watts on 2 meters and 50 watts on 440 MHz with an Alinco
> DX635 driving a 150 watt Mirage amp on 2 meters.

> The equipment is mounted breadboard style on the back deck of the SUV
> along with 2- good sized batteries to act as a buffer for the heavy
> amplifier currents.  The batteries are kept replenished via a number 4
> wire attached thru 80 amp fuses on both ends, directly to the + terminal
> on the front car battery and then run under the car.
>
> The antenna is bonded at the roof.  The tail pipe is bonded at the rear
> end to the frame.  The equipment grounds on the back deck are brought
> together and then bonded to the nearest frame point (about 12" away). My
> ignition  noise is about 1 S unit or less.

> The HF antenna coax has about a foot and a half of #43 ferrite cores
> installed on both ends to minimize RF back into the rear areas where the
> coaxes come into the car.

> Over all the rig works great.  I can compete very well in many DX pile ups.

> My problem is occasionally when I run the HF amp, my auto computer goes
> into "protect mode" from a P2440 error code.  The car then slows down to
> about 35 MPH max until I can clear the code error.  It only does this at
> random times when the HF amp is operated.  So the problem seems to be
> RFI caused, not a defective sensor.  It does not do it at all when
> running HF barefoot at a hundred watts.  Nor does it do it on VHF or
> UHF.  The problem is much worse when I try to run the amp on 40 meters.

> The code reader describes the P2440 error as "Secondary Air Injector
> system valve stuck open".   I can attach the code reader and clear the
> code and the car will run fine until some other undefined time, when the
> amp will cause another similar error.

> Anyone have any insight as to how to protect this circuit and where it
> might be located?  I don't begin to know where to find this valve and
> any related wiring associated with it.

> Thank you for reading the long missive.  Your attention and learned
> comments would be appreciated.
-- 
Ron - KA4INM