AW: [DML] End of life for idle ECU's

["Elvis Nocita" <elvisnocita@xxxxxx>]

Rich,

I am taking one apart at the moment and I almost have the schematic
completed.
It is absolutely no problem to replace parts in there. But it doesn't have
the
problem of the tranny governor, not at all.

But what I can tell so far is - it seems as BOSCH wanted to sell a
reasonable
sized plastic housing with something inside. This something needed to be a
PCB
stuffed with electronics. No matter what it does it had to be filled
completely.

I am not ready yet, but it seems as I could throw out about 50% of the parts
and get a better idle afterwards.
At least the goal is to improve idle by replacing parts in there.
I heared a lot about vacuum leaks or O2 sensors that make the idle hunt.
But why should that be ? That's what a regulator is for - to keep things
constant even when the parameters vary.

Within the next weeks I may come up with a solution to improve it.
Fixing the regular PC is no problem at all, let me know if you need help.

At this point thanks to Don Steger who got ma an old ECU to play with.
You guys really should check out his chrome rims....


Elvis& 6548

I recall that recently, we've had 2 or 3 cars, who's idle would
occasionally,
and randomly for no reason whatever jump from 700/900 to 2000 RPM's and
perhaps reset once the throttle linkage microswitch had been opened and
closed by tapping the accelerator pedal. The cause ended up being failed
ECU's and someone mentioned that we may be seeing the "end of life" for
these computers.

Twice lately, I've felt a surge while driving and this morning I was at a
stop
light and the engine jumped from 775 to 2000 RPM's until I tapped the pedal.

I'm now up to around 40k miles on my car. (Just so you know how many hours
have been logged on the ECU).

These appear to be developing auto-transmission governor computer style
failures. Has anyone been tearing a failed ECU down to figure out what
component has been failing and whether or not it's feasible to repair them,
or
would a new but unimproved ECU from a vendor be a safe buy?

Rich A.
#5335








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