I don't know what is wrong with my car. Maybe a month or so ago, it started to break up at high rpms!!! I changed the fuel filter, and the plugs and wires, and it's still doing it!!! It's really starting to **** me off!!!! Cause it still ran a 13.1 @ 107.2 on stock shot plugs and wires and just lid, filter, fra, O/R Y, and cutout, with it breaking up at the top end!!!! I know this thing is a 12 second car how it sits, and then I really can't wait to see what it does after I get my exhaust put on (See Sig)!!!! But I have to figure out what this is and get it taken care of first!!!! Does anyone know what it could possibly be? All of the sudden it'll just die out starting at like 5500 rpm or higher. It makes a sound like it's hitting the rev limiter, but it's not, like it sounds like it's stuttering or sputtering or something!!! If anyone knows what this might be, please help me out, i'd really appreciate any info!!!! Thank you guys!!!

 

more info.......

it might need tuning.....

 

I'm just curious, how could it need tuning? All I have on it right now is a lid, filter, off road y-pipe, and a cutout. That shouldn't cause it to need tuning, right? Also, it just started happening out of the clear blue.

 

Check the distibutor cap, spark plugs and wires.

 

Uh, there is no distributor cap on LS1's?? You're obviously thinking old-school (while the principles are the same, the new LS1's are using different parts).

However, taking "gearslammer's" advice, double check all connections between the plugs and the coil packs (potentially a loss of spark at high revs would cause the engine to stumble), and as well any other connections in the ignition system (ie: wires going to the coils). But, if you say you changed the plugs/wires and the problem was there before and is still there, then obviously that's not where the problem lies. Also, you said you changed the fuel filter, and that didn't help either, but that doesn't eliminate a problem with injectors (although I don't know if there is typically a problem with the injectors in LS1's??, or if that's even a likely cause??). I doubt that it's the fuel pump, because it would probably die completely rather than just lose its 100% pumping capabilities.

To me, the problem sounds like either a fuel (or lack thereof) problem (ie: leaning out) which could be in the injectors (so you may want to run fuel injector cleaner through the system..........but that's just a thought?? ), or it's an ignition problem which may be coming from the computer??

IMO, you're best bet is to go to a mechanic who can plug in a scan tool and see exactly what's going on with the engine. Maybe something simple like a TPS (throttle position sensor) is failing and therefore not sending the signal for more fuel at the top end, but I thought TPS failures would cause a SES light??................who knows?!

Well, good luck sorting this out. Again, I suggest going to a mechanic (unless it's something simple like loose wiring?!), but please let us know what you find out.

 

Hey, thanks man! I ataped it today, and my friend is sorting it out right now. I'll let you know what it might be as soon as he lets me know what the results are. As for the fuel injector cleaner thing, I put Chevron Techron Fuel System Cleaner in it about 2,000 miles ago, so I tried that. I do have one question though. I noticed today that the one of the gaskets where either the egr or air connects into the passenger side manifold is like shredded, and probably leaking, could that cause this? Like could it be taking in air at high rpms and leaning the car out? Just curious if it might cause this problem.

 

Absolutely, it could. I don't know much about the EGR setup on these cars, since the '00+ LS1's (or '01's??) don't have an EGR on them, but if there's a problem with the EGR, it could be causing a bad signal to the computer, and like you say, at high RPM's it's causing the engine to shut down. IMO, it's going to be something stupid like that, because otherwise, your car isn't heavily modded, so there's no reason for it not to rev out all the way to 6000 RPM because of a bad A/F ratio. If there's a problem with anything, anywhere, you've gotta fix it, because it's easier to rule out what's not wrong then.

Good luck.

 

Thanks a lot, i'll change the gasket tomorrow and then tap it again and see what happens!!!

 

Also, I just found out it's from the AIR.

 

Man it has nothing to do with your egr, Egr only works at crusing speeds, not at idle or wot. It sounds like you have a air problem,you can do simple checks like air filter, ect, but you say you put a new filter in. It dosen't have a SES light on? Most likely your MAF is going going... gone. Does the SES light come on sparingly if at all? one thing to keep in mind, if you have an ignition problem, the problem is always present, as in it's always occuring, if u have a fuel problem, it could be both ways. if your engine stumbles @ high rpms like you say it's not getting the fuel it needs. So most likely an air meterting device is @ fault, or outta spec. remember your computer controls fuel delivery based on air metering devices providing it with information, allowing it to richen/lean the mixture accordingly. many sensors could be at fault so it's pointless to name them all, but don't go crazy and change them all as that gets expensive, and won't solve your problem. I say find yourself a good driveability technician, hook up the scanner, and have him review the data stream.

 

[QUOTE]Originally posted by Capn Pete
[B]Uh, there is no distributor cap on LS1's?? You're obviously thinking old-school (while the principles are the same, the new LS1's are using different parts).

****e, my bad! His, car is acting exactly ( breaking up at high RPM's ) like my 95 did. I did not know they eliminated the distributor from the LT1 to the LS1. It was in fact an ignition issue. The cap was simply worn out.
Thanks for not being too harsh- learned somethin' new today.

 

Ok, this is totally weird. My car just totally out of the clear blue stopped stuttering at high rpms!!!! It's running strong as **** now, and I don't know why!!! It's pulling hard all the way to 6000 rpm!!!!!! I'm takin it to the track tonight!!!! Woohoo!!!!

 

LOL, wtf? thats cool though... did you do ANYTHING to it? like mess around w/ anything? now you know that you're car is a female - she PMS's from time to time and that seemed to be one of her heavy days, lol

 

Hehehe, that's exactly what I was thinkin, wtf!!!!! It was doin it for like a few weeks before I changed the plugs and wires, then Sunday when I changed em, I took it out after and all that night it was still doing it, but the next day (monday, hehe) I took it to my friends to autotap it, and it didn't do it once during the autotap and hasn't done it since. The only thing he did was clear my ses light from the bad front o2 sensors, but the light has since come back on and it's still running strong!!!!!

 

bad *** man! go take it to moroso and tell me how you do... if you want, take me with you! lol, i dont have an f-bod of my own YET... gotta wait till april or may, but as soon as i do, you'll be seeing me at moroso every friday or every other friday runnin it and spanking stangs and whatever wants to see the back of my car

ehh... there's some dude there at moroso w/ a MONSTEROUS T/A.... it's probably pushing 500 + hp all motor... that **** scares the **** out of my unborn children, LOL