gerard143

http://www.charm.net/~mchaney/optisprk/optisprk.htm


http://para.noid.org/~muttvette/opti.html

about the opti i could be wrong, i thought i recall that when tearing it down the 94 had a different part number on one of the parts.

also the addition of misfire detection allows the motor to adjust for this better thereby running better and increase mileage and horse, but the measure is so tiny you can hardly measure it,maybe an extra .5 mpg and .25 horsepower.


about the axle i could have sworn when my father ordered his 1996 camaro, he had a high performance axle option offering 3.73's. it was the only way to order it to get totally rid of any speed governor.

i had a ton of info that took me forever to find about 4th gens all saved and i got rid of it god knows why. that too had info about 3.73's i came across.


Well, WE found the problem. The EGR pipe...yep, that's right...there are two types, the solid and the flex. The flex is the more common...of course, I have the solid. The pipe does a 180 degree bend right down the back left side of the intake manifold heading for its final hook up. On long trips, the temp inside that pipe can reach upwards to 700 degrees Farenheit! Now folks, that's darn hot! The intake is torqued down with 35 ft. pounds a bolt...that's not much. The sealant is weak, we knew that. The liquid sealant is used in the front and rear instead of cork because of the "wavy-dippy" surface on the manifold. Bottom line: pipe gets hot, left rear corner of mainfold lifts ever so slightly, pressure under manifold is looking for a way out...finds its weakest link and carves a passageway...drip drip drip, right down the left rear of the block. The hotter the motor, the bigger the drip...the longer you wait for repair, the bigger the drip

http://shbox.com/ci/AIR.jpg see number 22 for high heat location area.

http://shbox.com/ci/intake_bolts.jpg leaks at point A

you are correct about retained access. power sorry.

gerard143

http://www.z28.com/forum/showthread....highlight=3.73

just found that. he has a factory 3.73 setup

pitbull14218

OK now i know some more things, anyone think that there is a better year for me to get other then a 96-97 camaro? 95 is ok? The most important thing is the car won't break down on me while i have to pay crazy insurance and car payments. so..... what seems to be the best year for me is what i need to know, i think 96-97 seems like it. Whats the mileage i should limit up to. On the year you guys suggest what do i need to look out for? The oil leak, what else? Thanks a bunch so far i love this forum

gerard143

only year i would avoid are 93's maybe 94's cuz of the opti. 93's for many reasons.

there is no set mileage to avoid. other then over like 170k haha, but seriously it all depends on how it was taken care of.

again 97's have the newer interior. it all depends if you like it or not.

pitbull14218

Well I was just reading and I heard about a skip shift problem... do all m6 cars have them? I seem to want the 96 the most... and I looked at edmunds abd other sites like Kelly's Blue Book. It seems there price on these cars are cheap for z28 and SS. Around $6,500. You think i would actually be able to get one for that price and have decent miles on it?

gerard143

you could pick up a ok mileage 95 z28 m6 with t-tops and leather for around 6,500 i'd say if you look around. watch ebay

gerard143

idk about a skip shift problem, i've heard people want to disable it but thats no big deal.

6SpdLT1Z

Well the parts you would need are a clutch, throwout bearing, and flywheel. Expect $200-500 in labor, maybe more.

6SpdLT1Z

All except the 93, it's called CAGS. It's easily disabled, search.

Injuneer

The 93-94 Optis are identical. Your references point out the differences bewteen the 93-94 units and the 95-97 units.
I think you're making this stuff up. The misfire detection is there because OBD-II requires it. Any adaptive strategy would be to protect the catalytic converters from meltdown... hence the flashing SES light to get your attention. Hard to see how responding to misfires would increase gas mileage and add ".25 horsepower". You have a reference for that one?
Plain an simple..... 3.73's were NEVER available from the factory on a 4th Gen. The speed governor was tied to the tires put on the vehicle. If you kept the "base" non Z-rated tires that came on the V8 models, you got a PCM speed limiter in the range of 108-117mph (varies by year). If you bought the RPO "QLC" Z-rated tire option, the entry in the speed limter field in the PCM was increased to "255", the largest possible number in an 8-bit binary field.

The A4's came "base" with 2.73 gears. The "performance axle ratio" package included the 3.23 gears, and a few other things. The 3.42 rear axle ratio has been put in EVERY 4th Gen M6 built since the 1994 model year. 3.73's were never used.

You seem to be dancing around every error I pointed out in your post.

We all know what the EGR riser tube is, and in the 94 and later models, the EGR riser tube has NOTHING to do with the AIR system. EGR may contribute to the intake manifold leak, but has nothing to do wth AIR. It may happen to be shown on Shoebox's diagram, but it is not part of the AIR system, and that was the point which you seem to have missed.

Injuneer

He is pointing out he had 3.73 gears in a factory 10-bolt rear axle assembly. HE added the 3.73 gears, they did not come from the factory. Only the 10-bolt came from the factory.

gerard143

yes ok i agree about 3.73's. and the air pump was a mistype sorry, what i meant was the air intake/egr setup meanign where the egr tube bolted to the intake.
sorry.

MENEGRANDE

93 is good! get the facts right

pitbull14218

a little bit confusing right now... Well I guess i want a 96 Camaro or trans am, they are the same right? Installing a clutch Throwout bearing and a flywheel all by myself how much are just the parts? If should try to grab one with around 50,000 or less? How much rust is bad i mean i think almost every car has rust so where should i look for it? Where is the most common part that gets rusty and can be a problem? Thanks for all you guys info

gerard143

93 is good? they blow... busted yellow gauges, different starter, different gearing in the manuals, no mass air flow. and various other changes