Most consider using a basic lab scope as low tech, lab scopes have been around
for how long? If it's not the latest greatest software driven with all kinds of
specialized adapters that cost in the thousands it's just not high tech.
Most of the work arounds we come up with in the field are hardly high
tech.... though the thought processes to arrive at the solution certainly
can be. One tool I use more than ever, lately, is an old headlight with two
leads with alligator clips. The PC/ED instructs us to use a DMM to perform
tests where the DMM is an inappropriate tool overlooking the need to load
the circuit to get a true idea of it's condition.
I'm sure we can all agree that selecting an appropriate test method to get
accurate results is more important than doing a "pretty" looking test. If we
fix the concern in a timely fashion without shotgunning parts, we've done
That's for sure. One of the other problems is proper training. I can not
remember a training class that taught the use of voltage drops. Use the term
voltage drop to most and you get the deer in the headlamp look.
Basic electrical... Specialty 32 with Ford, IIRC. 90% of the class has
trouble with the idea of 12 volts across and open switch and ~ 0 with the
switch closed. After working for indys for many, many years, my current
employer enticed me to come to work for him. Got my Senior in less than 2
years and I was amazed to find that better than half our basic electrical
class were repeat performers... one poor soul was on his 6th try.
Our instructors here are some pretty good guys but some of their students
only want paper and any raises the paper may bring.
The amazing thing is it's not a complex concept, yet it's the fastest and most
reliable method for finding electrical problems. I take a lot of digs about my
20 foot (-) test lead. We have the same issue with people understanding the
relationship of flow vs. pressure in hydraulic systems.
Everyone in the shop is constantly borrowing my "brick"... a scrap of
construction 2X4 with a 2 post terminal strip and about 30 feet of paired
wire... one red, one black, at the other end, two clips that fit on the
battery terminals... colour coding is about as high tech as it gets (but I
guess I could paint it, add some warning decals and a handle....). No more
searching for a good ground or a convenient source of power.....
Total cost using overpriced Radio Shack goodies.... under $10 CA..... Since
electrical/electronic diag time is all MT, I haven't gained a thing (other
than more time for good retail FR work) but my retail customers don't pay
for me to fart around looking for a good ground.
I wish I could claim the patent rights on this..... I read it somewhere a
long time ago and did the old forehead flatten (with the required "DOH!!")
since the idea was way to simple to think of....
That's the way it seems to always be. I got the idea of making a 20 foot test
lead by attending an electronics seminar a few years back. It was always a pain
to check the voltage drop of a ground in the back of a vehicle to the battery. A
lot of times it's not that you don't think of it, you do, but you question if it
is a good idea or not. One of my most borrowed "tools" is a led light I made for
checking hall effect switches, the other is a box of switches and a power supply
for checking trailer lights.
You asked, I answered. Got a problem with that shit for brains?
Try not to get your nose too out of joint when you're proven
So what. It's a correct answer and it proves you wrong (again).
Good for you. Doesn't change a thing.
Which is why I listed it as "optional" birdbrain.
Fuel trim can be skewed if there is a misfire, and if the engine
is over fueling, there is a good chance that it is misfiring.
IOWs, you really don't know as much about how an oxygen sensor
works as you think you do.
Hint, there are SAE papers on the subject, read them before you
shoot your mouth off about fuel trims.
The ones that you continually demonstrate.
For instance, how you just responded to the name "Bozo" like a
good little trained ape.
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