where s the rev limiter set at on a 92 lt1? thanks!

 

iirc 5700

 

 

what does iirc mean?

 

oh and it sputters like its maxed out when it gets just over 4000 rpms. whats the possible causes of that? thanks

 

maybe my tach is off too. is there a way to find out if it is?

 

mine was always at 6000 or a little more

 

Negative. It is factory set at 5886rpm for cutoff and 5875rpm for resume in first gear, and 5805rpm cutoff and 5794rpm resume for 2nd through to 6th gears.
As seen below: (ignore the red underlining, that was used a couple years ago when *89x2* tried to tell everyone he knows all and no C4 Corvette was ever fitted with a speed limiter, which you can clearly see there that it is, whether the car can reach it or not is irrelevent.)

Acronym for If I Recall Correctly
Yep, you will have found out by the time you finish this next sentence. Your factory tacho is not and never was dead accurate. Its not worth the worry. Crack open a beer, have a good cigar, and just try to forget about it.
Your what? The factory tacho is not accurate enough to tell you anything at those revs. With factory tune, you wouldnt be able to rev to those rpm.
The tacho and the rev limiter are not your issues. Could be anything really, start with a new fuel filter, pull the fuel pump up and check the in-tank filter on the base of the pick up,
check your plugs and leads,
check the ICM (thats ignition control module),
Check the coil,
check to see all your injectors are getting signal to fire and test their resistance with an ohm meter,
check the MAP (manifold absolute pressure sensor)
check to be sure the IAT (intake air temp sensor) is where it belongs and hasnt been moved to the air filter box
check the ECM for stored codes.

After you do all that, report back your findings.

 

Wow thanks alot! the only problem is i have no idea how to do any of that and it sounds pretty pricey to get that all checked out. To make matters worse i was at a stop light yesterday and it started idleing really rough and i pulled into a chevy dealership. when i tried to start it it took at least 2-3 seconds of cranking to start then reved up and slowly came back down to a even rougher idle. kinda made a knock noise too every once in a while. God im gonna be spending a lot of money soon. i really hope its not a bent rod or something! ive had the car for 3 weeks and it spent most of the time in the shop! i gotta get the bugs out of it! any idea of what that issue is all about?! :will y:

 

There is no rev limiter on a vette, when the ECM detects you reached a certain rpm it cuts of fuel. You can program your ECM to have a rev limit of 9999 rpm's, it will only go that high as the field is a 4 byte field.

I am talking about a rev limiter device, aka govenor.

 

Close enough, but its 10,000 itll go to, i just had a look.

There is indeed a rev limiter, dont argue with me about it, cause youll be as wrong as anyone else if you say there is not. Feel free to argue with anyone else if you like, but ive given my facts in the picture above.

But here is a question for you to think about before you do reply:

"What happens when you no longer supply an engine with air or fuel or spark?"

It fails to rev any higher, hence, cutting the fuel will cause the engine to slow down, at a predetermined RPM, which whether you like it or not is called a rev limiting device, or "rev limiter".

No rev limiter can ever stop an engine from being over revved indefinately, throwing the shifter into 2nd gear at too high a speed will still cause the rotating assembly to exceed its theoretical maximum speed no matter what youve got limiting rpm, so cutting fuel or cutting spark is as good a way as any to help prevent over revving.
No worries mate, i cant see where it says you live, so i cant offer you a suggestion as to who to get to help you. Im in Australia, so im no good to you.

Mate i really think they should start with the fuel filter and the one in the tank, i spose before they do that they should observe the fuel pressure with the engine running, and id go rather thoroughly over that ignition system too.

Having the car 3 weeks and spending most of its time in the shop is nothing new for a Corvette owner mate, so dont worry too much, youre not the first one, and surely wont be the last. My advice to you is make sure whoever does the work is top notch, and DO NOT try saving by using sub-standard parts. Using the best part for the job will almost always ensure a reliable car for a long time to come.

 

Welcome back;
looks like the Forum is going to be " interesting " again

 

You should read what the op stated and then read what I wrote.

THERE IS NOT A REV LIMITER device on a vette, it is as I said controlled by the ECM.
So mate, read before you type!!!!

 

I had it towed into the dealership the other day and two of the injectors ruptured or something and they said it flooded the whole engine with has so now i have some work cut out for me. I'll go with the FIC bosch injectors. Do you think the new injectors and fuel filters will fix my sub standard RPMs? Also I live in the US in St. Louis, MO. You have been a great help! Any more feedback is GREATLY appreciated!

 

If it was running that rich, check your cats. Bad FI's caused my cats to clog and that caused my car to not go over about 3500 RPM's. Also, check o2's, as a rich condition can kill a o2 quickly.

 

A rev limiter is a device that limits RPM. Any device that has direct or indirect control over maximum RPM can be considered a rev limiter. With that said, i think it is you that should read before you type, cause i thought i stated quite clearly not to argue with me. The ECM is a device, and the ECM has indirect control as well as direct control over the engine's RPM. It is therefore, a REV LIMITING DEVICE.
No worries mate, ill see what i can do Thanks for the welcome
Yeah that makes enough sense, what ever injectors you do go with be sure they are all of the same flow rate, so if the new ones are not, youre best off replacing all 8. If the flow rate variation is very small, put the highest flowing at the front of the engine (ie on cyls 1 and 2) and the lowest flowing toward the rear (7 and 8) this is cause the front cyls can usually suck in more air than the rears so theoretically your idle should be smoother.

 

I'm thinking the new injectors and fuel filter are going to make a big change.

 

Yeah, and if it was me, id change all 8 injectors, and both filters, depending on the condition of the in-tank filter. I reckon depending on the age of the O2 sensors they should be fine, if the car gets a good long highway run after its all sorted out they should clean up ok.

Hows it going STL94? Long time no chat mate

 

It's good to see ya' back!!