PPI Protocol? What do I do now?

Of course give it to them. If you still want the car, it makes for a better bargaining basis if both know the car's faults. If not, it helps him get it ready for the next buyer and is a nice gesture. If he wants to retest, it is on his dime.

Taz
Terry Phillips

 

+1

 

I consider the ppi results the work product of the shop and would only provide a copy to the seller if the shop consents.

 

Baloney. He paid for it, it is his to do with what he wants.

Taz
Terry Phillips

 

put the seller on notice.

 

Keep us posted...

 

Buyer pays for everything typically.

Whoever buys-owns and it is theirs to do with as they please.

 

The cake is the work product of the baker. I paid for it and can't take it home to eat it?


You have strange business practices.

 

Errrrrrrrrr, good luck with that mate.

+355!!

 

Just curious what the compression/leak down numbers are? Were they really that bad? Can't be that bad if the shop thinks that driving the car might make it better?

 

I can't speak for the leakdown, but the compression numbers look great to me. Those numbers are much better than my car. I have a 1995 355 Spider with 36,000 miles.

 

Is this a really low-mileage car?

 

If the test was done correctly, I don't think 32% leakage on the intake is something that's going to fix itself but I look forward to the re-test results.

 

Is it even possible to have 32% leakdown with over 200 compression?

 

+1

 

I don't understand what you mean by failed a PPI and requiring a retest. Unless you mean it failed a State Inspection.


Those numbers seem a little off to me.. Do you mind me asking who did the PPI for you?

 

I believe that it is up to the buyer to pay for the first PPI, which shows genuine interest in the car. If it "fails" or requires additional for a retest, it should be on the seller to show he has done his part to rectify the problems. You have invested in a car you dont even own, and should not be expected to pay multiple times. Or have the seller discount the car twice the price of the second PPI.

 

I would question the validity of these engine test results.

Those compression numbers taken by themselves look at the very least decent. I am not talking about the greatness of the numbers (i.e., that they are over 200.) I am talking about the fact that the worst cylinder -- #4 -- is within 10% of the best cylinder. Different people will tell you different things, but typically within 5% from worst to best cylinder is desired but within 10% is not awful.

Then the leakdown #s indicate pretty not-so-good results. Cylinders 2, 3, and 4 exhibit substantial leakage.

Only problem is, the leakage numbers tell us that the compression test was not done properly. Cylinders with that much leakage will NOT exhibit compression results that good -- that is, an engine with good compression MUST have good leakage numbers. I will illustrate the logical relationship below. Again, cylinder #2 having 210 compression and a whopping 20% leakage does not make sense if cylinder #8 has a 224 compression and 4% leakage.

The logical relationship between compression and leakage is as follows:

Good compression numbers --> Good leakage numbers

This is a true statement. If an engine has good compression #s, then it must have good leakage numbers. You cannot have poor leakage results but have good compression results. That would be a spurious test.

Good leakage #s --> Good Compression #s.
This is a false statement. If an engine has good leakage #s, that doesn't mean the engine will yield good compression #s. This is why we do the compression test first. The trick is to use proper methodology.

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On another note: I would not disclose the results to the seller until you perform the second PPI, if you so desire. Oh, and that will be on your nickel. You do not want to give the seller or anyone else the opportunity to pepper the car so that the results will be better next time. A little squirt of oil in the cylinder, you know, fixes a compression test.

That said, I have never heard of doing a "second" PPI.

I would also get a new shop for the second PPI. Seems they do not know how to perform the compression test. This leads me to question their competence in checking the other vital areas. Then again, many so-called "mechanics" don't use any scientific basis whatsoever for performing compression tests. There is a specifically scientific approach that must be followed to keep variables isolated and spuriousness away. Sure, there can be some variation in the conditions under which the test is performed, but the approach is the same. You can't just crank each cylinder till the needle stops moving and write down the final pressure # and call that a compression test. A 6th grade science teacher would be appalled at that use of the scientific method.

Either way, the leakage numbers do not lie. If it leaks, you've got some issues.

 

The compression and leak down tests are invalid.


Someone did not know what they are doing or used faulty equipment.



Find someone who knows how.