Leak-down test...Analysis?

[Paul Workman]

Originally Posted by tomtom72

I was told the good stuff is Techron by Chevron. Black bottle any autozone or Costco has a 4 pack for about $20.00.

Paul, not to be forward.....I notice with mine that around town driving is the worst on my car. I go out with my vette buddies & try to keep up and the car never runs better...for a few days untill my around town driving "loads" it up again...if I drive it like a wuss = car don't seem to like it. If I beat it with an ugly stick = car seems to laught at me & wants more & she runs sweet. Oh, I'm using the std GM replacement plug for the FR2LS's that were OEM in my 90.


Tom

Yeah...I'm beginning to see that same performance pattern among some other Z drivers posting here and at that "other place". Mine too. After idling (especially from sub-freezing to just operating temp), mine went from running great to stumbling, balking, missing - primarily when giving it some gas. After it got warmed up good and ran the snot out of it a few times, all was well...Until next time.

Well, I bought some new plugs yesterday, and I'll get them in today and see what difference that makes - assuming the ones in there are original. My usual parts supplier didn't have the NGKs Jeff recommended, but he told me the Platinum/Irridium plugs are all made by Champion, as they're the only ones that have the tooling to make those plugs. According to his sources, Champion makes the plugs for NGK, AC/Delco, Autolite, and others...Interesting.

Jeff, if you're reading this too, I couldn't find the NGKs locally, so I cross-referenced them to AC/Delco #41-800 (listed for the 90 ZR-1). We'll see how they work later today, perhaps.

P.