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Make that "99.9% cleaner" and you'd be right: it's not uncommon for a new car in a rathole like L.A. to have cleaner air coming out the tailpipe than what went into the aircleaner. Some cities are just located such that atmospheric conditions are right for the photochemical process that makes...

You didn't say how many miles you've got, but if it's over 100K, you need to watch for a bad (leaking) waterpump; just replaced mine at 114,000 and found it also needed a new intake gasket - the water passage there was leaking also. Between those two fixes, I think I've got my water leak...

I got a laugh out of your post, since the same thing happens to me more than I care for! I'm in the NVH business, working on reducing vehicle noise, and numerous times I've installed a "sound package" that was supposed to quiet a car or truck, and didn't do a doggone thing. In every such case...

"I need the replace the RH..." LOL!

I've always run 36 psi on my '89, and get very uniform tire wear.

One more thing about "thermoshock:" Once your engine is up to operating temp, the thermostat doesn't open and close, but stays in pretty much the same position constantly except as load conditions change, and then it slowly opens or closes to compensate, until it's all the way open with the...

If both your fans come on when you have the a/c on, you're fortunate; on my '89, one fan comes on with a/c on, the other waits until top water hits 228F - and I'm sorry, that's just too dadblamed hot! So I've wired my fans to a switch - both come on when I hit the switch. Works great.

Hmmm, you just made me think of another possibility: I'm going to try replacing the radiator cap before I do anything hasty. Doing that on my old Bronco stopped a persistent leak there.

Hey, thanks! Mine has done exactly the same for years, and since it was easier to just dump in some new coolant every coupla weeks, that's what I've always done. No signs of coolant in the oil, and from past experience, I can tell in an instant, by the sickly-sweet smell, when the heater core...

Oh, yeah; and I do live in Texas, where a mild summer day is anything under 100, and 105 at quitting time is very common.

I've been running 160 thermostats in my '89 since '93, something like 80,000 miles, and the only thing I notice it that it takes a little longer to overheat in summer traffic, since it's starting from a lower temperature. Runs fine. And that "thermoshock" thing sounds like a bunch of hooey.

38 psi at idle is OK; 38 psi above 2000 rpm, warmed up, is something I'd keep an eye on.

Not in this regard he doesn't; I do. Like I said: if he doesn't think he got an improvement from taking off his cat, I KNOW he didn't run his car on a dyno. I did the exhaust design and development for the C5's, and all early development work was based on C4 L98s (such as I own) and ZR-1s. I...

My '89 wtih 120K miles running Mobil1 10w-50 does 43psi at hot idle, 61 psi or better at 2000 rpm or more.

Louis: I'm up in Denton County, work in the city of Denton. I'd suggest PM ing me if you're ever up this way, but I sometimes spend a long time off this forum...

Sorta like the old radar detector "tests" C&D used to run, where "Escort" always took top honors. Carp & Drivel never mentioned that their editor Patrick Bedard was racing a car totally sponsored by Escort, did they?

I hope you don't really believe that. It's not even close to being true, your wishful thinking notwithstanding.

Yes, lots of people have reduced the exhaust backpressure on the L98 motor, including Chevrolet themselves. When they tested with open exhaust, neither mufflers nor cats but with a straight pipe, they showed about another 30 HP. The airpump, however, only draws about 1 HP max, so while...

Bet you didn't run it on a dyno. There's a good 20+ HP to be gained with exhaust modifications on an L98 motor. C4s built before '91 had prohibitively high exhaust backpressure, some in the catalyst and some in the mufflers. While going to low-restriction mufflers would get a big boost in hp...

Here's the deal: the resonance is very much different with a convertible like you have than with the coupes all the posts above refer to. Find someone who has put one or the other of these mufflers ON A CONVERTIBLE and ask HIM how it sounds! (The resonance in the coupes is a result of an...