surging while holding speed, more

[fretburnr]

mine's pretty stinky on cold start, but runs OK. obviously different to drive, but not unacceptable.

[fretburnr]

here's some new stats... did a vacuum test and compression test tonight (finally got a T fitting i'd been looking for).

Before I continue, much of the drivability problems had vanished today, presumably after getting rid of much of the bad fuel. Nonetheless,

Compression came out much better than I had expected. Tested with 5 cranks per the Bentley manual, we saw 165 psi across the board, with no more than 1psi variance... except for cyl 3 higher by a 3-4 psi. Those numbers seem too good to be true, especially on a 223k engine, but we retested each cylinder 3 times, same results. Also, this was a dry test - no oil squirted in to test for bad rings.

The vacuum test was interesting. The bentley shows 15-22 inHg and steady at idle is normal- i found about 14" and lightly floating. Looks like a manifold or TB gasket is in order, since all other intake leak points are fixed (even the injector orings are recent)

[fretburnr]

still can't believe those compression test numbers.

also replaced the cheapie temporary champion plugs with bosch supers, and it runs significantly better today. I will do another vac test as idle isn't fluctuating at all.

[NC325iC]

how did you do the vaccum test, did you put a vac pump on where the fpr connects or what??

[fretburnr]

not a vac pump, but an actual vacuum gauge. a friend of mine had one (not the kind you install in the car, but a larger shop-style one just for this purpose).

I used some extra hose and a T-fitting into the FPR line.

I'm still kinda floored with those compression numbers though...