Enigma540

1998, m6, formula, 72,xxx miles, no problems, runs like a dream. Question for those of you that have had these cars for many years, what's your opinion on replacing sensors "just because of age/mileage? I have no problems, no mil's, but I'm fairly certain my car has all the original sensors (tps, 02's, iac, coils, etc). My harbor freight scanner shows 02 switching and L/STFT's to be fine (within the scope of my understanding), so is there anything to be gained from replacing perfectly working, but old, original sensors "just because they are old"? Thanks in advance for any replies.

G Atsma

If they are performing within normal parameters, keep them. Most are easy to change if/when an issue arises.

99 Black Bird T/A

iTrader: (4)

One often over looked area of maintenance for these LS1 4th Gen is replacing the intake manifold gaskets. After 20+ years of being compressed, they can slowly start to leak.

Sometimes leaking in a disastrous manner after a hard rain, resulting in a hydro-locked engine.

The only sensors I would replace with no codes and no issues would be the knock sensors while the intake manifold is off for new gaskets. Mainly because it's annoying to pull the intake to replace knock sensors if they fail.

Regular coolant flush and replacement goes long way in keeping radiator happy etc.

01CamaroSSTx

iTrader: (3)

If it's not broke then don't fix it would be my suggestion. I recently noticed one of my fans doing some chirping after shutdown so I put the compressed air to it trying to clear the dirt out of it but its still squealing so it looks like I may be removing the fans to investigate further.

Floorman279

iTrader: (11)

half the sensors you get wont be "original" and will be the "gm recomended replacement" sensor......definately not the same.

in this scenario, it would be sorta like replacing a 150,000 mile well built car thats 10 years old for like a brand new KIA soul. just because its new doesnt make it better or less prone to failure.

Enigma540

Thanks for the replies, guys. The basis for the question is that I'm putting together a parts list for when I put it away this winter (hci and such), so new intake gaskets will go with a fast 92. Read your review of the 90 ls6 several times, black bird, and since I don't have an ls6 to begin with I'm going to go with the fast 92 (more concerned with broad, flat mid range torque) . Already did a dexcool refill (sadly, before I was aware of the coolant sensor issue with these cars). It gets driven very little, maybe 500-700 miles per year in the summers. Time is my nemesis. So, if I can end up with the same result (or better, had I wound up with an inferior sensor or two) while spending no money, sounds like an awesome plan to me. Thank a lot guys.

99 Black Bird T/A

iTrader: (4)

The Fast 92 sounds like an excellent choice for your application. Sounds like a well cared for Formula, that's well on the way to being an even more fun Formula!

.boB

iTrader: (1)

Most sensors on the engine last just about forever, and never need replacement. There are two notable exceptions: O2 sensor, and TPS.

The O2 sensors will slowly fade away, until they eventually die completely. Especially is cars that don't get driven much, or only get driven for short periods. It's reasonable to replace those every so often. 50K miles is not unreasonable for a good Bosch sensor.

The TPS is more than a sensor, it's also a mechanical device. And it's plastic. It can wear and get sloppy where the metal shaft meets the plastic sensor. If there's any wear at all in there, I'd replace it.