The more I dig the more I find wrong
 

while taking the motronic a part I noticed something wrong with the eprom... Hmmm. D*mn PO...
Has anyone else found bent pins in their eproms. The pin was not even in its hole, just touching it. Good thing the whole darn thing didn't short out.

http://forums.pelicanparts.com/uploa...1123444586.jpg

I think if you just bend the pins inline with the others you'll be OK. I just put a Steve W. chip in and I could see how someone could bend the pins like that. Need a light touch putting the chip in. Is it a stock or aftermarket chip?

Gordon,
Stock chip. I had no problem bending it back and popping it back in the board. I just wonder what effect that could have had...

I guess I'll know some day when I get the car back together.

PO may have had an aftermarket chip in there and then swapped it out before he sold it. There is not really any reason to remove the chip otherwise. Hope it works fine for you!

If the car ran before you bent the pin back, I would not try to start it now. You will want to identify the chip (27x64, 27x128, 27x256 etc.) because that is probably an address line that is not needed. By bending it back so the pin is inserted the chip will not be addressed correctly and the car will not run. I had a dual map chip installed in a larger eprom at one point and using a switch connected to a pin like that you could select one of two different performance maps. Steve W will be able to guide you further on this.
Good luck -

Thoms, you do not have to worry about that - the car is just about completely disassembled. It will be a LONG time before I can even attempt it.
But I will check and see if the chip is stock or not.

I tend to think the bent pin was more of a mistake, than somebody intentionally bending it out of socket. Just straighten and insert.

Will have NO Effect. I've taken mine out 2 or 3 times, and each time, desoldered and soldered it back in! Pins are bent all kinds of ways. If the solder is good and you have current flow, yer in biz.

http://apavlov.club.fr/motronic/ml31/ml31.html

You need to contact someone that knows, or find a diagram that shows, the "pinout" of the chip. You may have gotten lucky, and that pin isn't used for anything.

Jon

From the photo, I think it is a 24 pin chip. If so, depending on its orientation, it is either A7 (pin 1) or D3 (pin 13).
Poor diagram,

2716
2kx8 EPROM.

+--------------+
A7 |1 24| VCC
A6 |2 23| A8
A5 |3 22| A9
A4 |4 21| VPP
A3 |5 20| /OE
A2 |6 19| A10
A1 |7 18| /CE
A0 |8 17| D7
D0 |9 16| D6
D1 |10 15| D5
D2 |11 14| D4
GND |12 13| D3
+--------------+

Tim

Would like to know which pin is in question here (for signal's sake).

Easily bent back and reseated...NOT an issue, as long as you don't fracture the connection point at the body...the leads are quite flexive and sturdy.

Was it making a connection in it's seating arrangement (irregardless of what it "looked like")?

Best,

Nine9six - probably good advise
Kurt - a little reckless
John - a little cautious
Tim - Nice chart
Doyle - "Irregardless" is NOT a word

Greg... Good luck!

The word you are looking for is ... irrespective

This is why I love this forum...beautiful!
:D

Thanks for the info guys. I am currently in the process of building a rotisserie for my car. A long way to go still!

Irregardless is considered nonstandard because of the two negative elements ir- and -less. It was probably formed on the analogy of such words as irrespective, irrelevant, and irreparable. Those who use it, including on occasion educated speakers, may do so from a desire to add emphasis. Irregardless first appeared in the early 20th century and was perhaps popularized by its use in a comic radio program of the 1930s. Irregardless is a word that many mistakenly believe to be correct usage in formal style, when in fact it is used chiefly in nonstandard speech or casual writing. A combination of irrespective and regardless sometimes used humorously.

..In the dictionary? yes.............used humorously? yes..........

I'll try to be a bit more formal within our our "formal" newsgroup so as not to offend (or confuse?) our formal readers.

I'm so sorry,,,,,,,,,,,,,,,...........hope I didn't offend anyone with it's use. I feel terrible for loving double negatives.............counseling should help.

What are these "chips" of which you speak? :p

The only "chips" I want in my car are ones with salsa.

No Offense taked Doyle, just couldn't resist. We do appreciate the linguistics lesson however.

In the future I will happily use the word "Irregardless", irrespective of it's irrelevance and irreparable consequences.

No need for the counseling, we LOVE you just the way you are.

Peace

Try some of "Loren's Salsa"...he doesn't do chips either IRregardless of what we try to tell him :)

Just a small piece of info from an old tech.
The "chip" is the starting place for the computer or ECU to begin.
It holds the original set of parameters for the car to operate from, such as enrichment, dwell, timing, etc.
After you have run the car for a while, the program changes slighly to allow for filters not passing as much air, or exhaust systems plugging up (cat converters) , plugs wearing out and other "replaceable" items.
Each time you service the car, you should reset the ECU.
This is very easily done by disconnecting the battery for a short time to allow the "learned" memory to drain and make the ECU run back to the "chip" to get the original parameters for running.
I usually disconnect the battery as I service, or disconnect and go for coffee.
The factory says the reset happens in a few seconds, but I have seen capacitors hold a charge for several minutes, hence the time I allow for discharge.
Hope this helps.
Bob

Good point Bob, they are indeed "adaptive"!

JimT: funny.......... as,......... #$%^&.

My bad, regardless.

My best (always),

True for 964's, but not for Carrera's. There is no adaptive functionality with the 3.2 Motronic.

ianc

Thanks ianc! I knew I had read that about the 3.2s, and here is a post I found:

The reason I thought that the DME ECM could suddenly lose its mind was based on what I read in Bentley on pg 240-4. The note there says that poor driveability could result if the battery had been disconnected previously (mine wasn't) because the DME adaptive memory is erased and that after 10 min of driving it re-adapts. So now I'm confused. Is Bentley wrong?


Someone else replied that the Bentley manual is indeed wrong in this regard. Sorry about passing along bad info...live & learn :).