gasmanstl

Any electrical and injection gurus out there...

Did Porsche make more than one variant of the LH in terms of the pins and their corresponding functions? I am working on an 86 S4...

Some stuff from a WSM snippet I got from CD refers you to check pins which are definitely wrong; eg, temp sensor II test - "connect ohmmeter on terminals 2 and 5 of disconnected LH multiple pin plug" - then gives specs. That's definitely wrong for this car. and the ones someone else gave me are right. This is on p 24-114 of WSM. I just wonder if they kludged the pins from year to year...??? And maybe my copy of WSM doesn't work for 86.)

dr bob

Gas--

There's no such thing as an 86.5 S4 (in yuour sig...) , so maybe the differences are in the years you are looking at in the WSM. The 86/86.5 are LH, 87 starts LHA, if I remember correctly. There's a difference.

gasmanstl

both door-sill-rocker-panel-treatments say "928 S4," and it's definitely an 86. I can't remember wherefrom I drew the conclusion it was an 86.5...could this be the extent of my mistake? Maybe it's just a plain 86...

FlyingDog

84-86 LH 2.2
87-95 LH 2.3

2.2 and 2.3 have completely different connectors. I think various years have minor changes to pin outs (diagnostic, lambda).

86.5 has the "S4" suspension started on 86 Euro/ROWs. It would be very obvious whether you have an 86 or 87... the front and rear of the body are completely different and so are the top halves of the engine.

John Speake

A car built in late '86 could be an early S4, rather than a late 86.5.

The LH2.2/EZ-F fitted to 86.5 have 25 pins on their connectors, the LH2.3/EZK fitted to S4 onwards have 35 pins.

123

There were no original door sill plates that said "928 S4", were there? I thought that there were only those that say "928", and then later on the ones that say "GTS".

gasmanstl

Aha. This certainly explains the discrepancies. I have a 25 pin connector, and I was looking at a 35 pin diagram. WSM must be referring to a 35 pin in the instructions that didn't work...

Has anybody got a pin diagram for the 25 pin plug? I think the 35 pin one is the only one described in the CD version of the manual I got from someone here.

Thanks.

John Speake

http://www.electronikrepair.com/wst_page7.html

http://www.electronikrepair.com/wst_page8.html

gasmanstl

Thanks, john...but the LH link there illustrates a 35-pin plug... Maybe I can fish at that site and find the 25 pin one.

gasmanstl

Now here's a conundrum: I just noticed this (of course, I have no life: I'm NOT sleeping at 0100, and I'm thinking about this problem enough to go to the garage and look at the shark.) Mine is definitely an 86-something, according to its title. (Its VIN is WP0JB092XGS860926; I'm not looking at the thingie that ID's cars by VIN for the year of manufacture). I have counted them twice - three times, even. I have 25 pins on my LH, denoting the status of 2.2 for this brain. My doorsills are replete with the words "928 S4." According to JDS, S4's have 35 pins. 25 pin varietals are supposed to be 86.5's, and not S4's.
(It is worth noting, as JDS himself said that LH 2.2 is paired with EZ-F ignition brain, that my ignition brain is clearly marked "EZK" by none other than Mark Robinson, from whom I purchased this turboshark, who is presumably a reasonably dependable source. Just for fun, I'll mention that this car is apparently the developmental model for Mark's turbo-kit. I must say it runs pretty good, except for this little injection glitch.)

Comments? (which I presume will be predominately from JDS. Thank you in advance, John.)

Vilhuer

It is definitely '86 MY and US model. Its also early '86 MY, not '86.5. So it should have EZF ignition, older style suspension and brakes. EZK marking on top of box do not mean its EZK. Pin count 25 vs 35 is easy indicator what box it actually is.

John Speake

From what you say, Mark has himself written "EZK" on the case which strictly speaking is incorrect terminology - we will let him off with a severe reprimand this time..... :-)

However, as Errka says, you will find that the EZ-F and LH ECU both will have but 25 pins.