I've worked on all kinds of cars , for decades, and have never seen an ECU that needed to be, or was mounted, so it's insulated from the vehicles body. totally normal that an ECU with a metal body is screwed right to a metal part of the car.
On 9/8/2014 10:39 AM, Neil N wrote: > Hi all. Thanks much for the responses. > > Of note, the old Jetta ECU I rplaced, had som serious burns on a few small > components > and a copper ground trace. You can see where this circuit board trace arced > to the multi pin connector frame; it's likely that electricity jumped > the 1/4" gap between these two parts as it may be that this frame part > grounds to the vehicle chassis. Ironically, engine still ran "ok" but has > always had a mysterious intermittent lack of power )felt like timing > retarded) with a more recent slight surge under load at higher PRMs. > New ecu is working fine. Better power, and at last check, 1.5 MPG better > fuel efficiency. > > Go figure. ;) > > True, it was risky, and you've made an important point, but when I saw the > circuit board burns on the old ECU, swapping ECUs was a no brainer; I > compare and inspected the new used ECU to old one before installing. Before > firing up the engine with the new ECU, i made sure the fuel pump primed and > that the MIL light came on, ignition on, engine off. > > Neil. > > PS. thinking now, I recall that in the OEM application, the Jetta ECU mount > bracket may be insulated from the vehicle frame! The way I mounted it in my > vanagon, this bracket is "grounded" to the vehicle frame. > > Is this incorrect? > > Hope this post made sense. Am using an iPad mini to compose it. Thanks. > > On Friday, September 5, 2014, SDF ( aka ;jim lahey' - Scott ) < > scottdaniel@turbovans.com> wrote: > >> I'll agree with that too .. >> for welding on the rig....disconnect all batteries and ecu plugs. >> >> Don't know if the rig was running fine on the trip before swapping out >> the ecu ... >> but if it was.. >> I sorta have this rule when on a trip ...don't work on stuff unless >> there is a problem . >> > > -- > Neil n > > Blog: tubaneil.blogspot.ca > > '88 Westy http://tinyurl.com/c8rlw6p > > '81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/ > > Vanagon VAG *Gas* inline-VR Engine Swap Group: > > http://tinyurl.com/d7gd5ej > |
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