More problems

rluvsporsche;1579 wrote: I want to give all an update on this issue on MY87. To give you a full understanding when this problem begin after replacing engine mount, power steering line and oil pan gasket on Labor Day weekend. After getting the hatch lock and vacuum lines replace I drove from Chicago, IL to Green Bay, WI for the weekend. I had no issue driving for 3 hrs until I got on the Dyno. My hesitation, hard start and idle problems are back, it shows car running very rich. We diagnose the car all weekend long and still puzzled what we found. We took the spark plugs out appeared bad but don’t appear to be the problem. Check compression it we got 210-215. We decided to replace the spark plugs and MAF since we had a spare. The car started and running good. After a while car started idling irregularly running poor again. We check fuel pressure and spark which are good. When the car won’t run we have spark but injectors we not working. So we changed out with new relays and same hard start. Check and cleaned the ground harness. We decided to swap LH still no improvement. We had spares of EZK we went ahead and replaced the EZK. First EZK no improvement but if we use it on another 87 it works fine. We tried the second EZK it was happy all the issues gone. Now here is the kicker we took the first and my supposedly bad EZK use it on another 87 and no issues what so ever although we did not take the car for a drive just let it idle. We did not have the irregular idling or hard starting that I get on my car. I drove back home using the spare EZK my buddy let me use temporarily until I get a replacement. I stop at rest area and restarted the car; it took 3 cranks before I was on my way. Just to clarify 4 of these 928 buddies helping me out are extremely familiar with 928. Any comments or suggestions before having my EZK rebuilt? Does anyone know of where I can get my EZK rebuilt? Thanks in advance

The part about the EZK is strange. Not a usual 928 area of concern. I have heard of similar situations when switching the LH though. I have seen where one LH would operate two different cars and another LH would work in one, but not both. Weird, huh? :confused:

What was your fuel pressure when you checked it? Also, have you checked your vacuum since replacing the vacuum lines? Your compression figures are unusually high. So high, in fact, that it's either not accurate or there is a problem on one or more neighboring cylinders. Did you document your compression for each cylinder?

My first guess from reading this and the corresponding one AO put up, had me thinking O2 or Temp II. I'm sure it was checked, but how were the wires to the Temp II?

You know guys, this is where a scan tool is invaluable.
I would not even think about working on any electronic issues on any vehicle with out plugging in a scan tool.
You can see high resistance or temp drops in voltage.
You can take a snap shot when it happens and review the history 1 min ~ before and after.
It makes life so much easier.

Now the problem is that I don't know these cars and so I don't know which scan tool porsche used at the dealer,
but I am willing to bet that what ever they used is the best tool for the job.
This is why I asked the questions about the shark tuner and what the 928 OC uses.
I am willing to buy what ever porsche used If i can find an old one, just to work on my car, unless a more modern/better scanner is available.

928mac;1599 wrote: You know guys, this is where a scan tool is invaluable.
I would not even think about working on any electronic issues on any vehicle with out plugging in a scan tool.
You can see high resistance or temp drops in voltage.
You can take a snap shot when it happens and review the history 1 min ~ before and after.
It makes life so much easier.

Now the problem is that I don't know these cars and so I don't know which scan tool porsche used at the dealer,
but I am willing to bet that what ever they used is the best tool for the job.
This is why I asked the questions about the shark tuner and what the 928 OC uses.
I am willing to buy what ever porsche used If i can find an old one, just to work on my car, unless a more modern/better scanner is available.

I don't know about finding an old one, it is called the Porsche Hammer. I have one on loan right now. Just keep in mind it can only provide information that these old sensors were designed to provide.

So in your opinion, is there one out there that provides the same and more. Is that what the shark tuner dose?

Some times paying for a scan at the dealer is worth the money and saves you from spending more on trial and error.

I haven't used it, so don't know. I would anticipate it is better or cheaper, or both, otherwise it wouldn't need to exist