• Got the Contributing Memberships stuff finally worked out and made up a thread as a sort of "How-To" to help people figure out how to participate. So if you need help figuring it out, here's the thread you need to take a look at -> http://www.corvetteflorida.com/forums/showthread.php?t=3581 Thank you, everyone! Rich Z.

hesitate/stumble

sglfladad

sglfladad

New member
I'm going to do my best to describe a problem (I think) I'm having.
01 ZO6 - stock 80k miles.
Generally runs fine and fast. Once in a while only when wot from stop in 1st gear, as I get close to shifting into 2nd, engine bogs down and I feel something like a stumble or hesitation. Symptom continues for a little bit, even into 2nd. Continues even after letting up on the throttle..for just little bit, then all seems to go back to normal. Sometimes it has happened when wot from rolling start in 2nd and into 3rd.

Now, I read somewhere there's a rev limiter ...could this be kicking in and it takes the computer just a little bit to settle down again? Once I was watching the tach when it happened and I don't remember seeing it go past redline..but alot was going on and I'm not absolutely positive.

It feels similar to a feeling I had on another car when there was some gunk in the fuel filter and when fuel being sucked in it would clog, then unclog when backing off.

No codes in the DIC..

Is this normal, or could there be a fuel delivery issue and how would I diagnose that.

Again, it doesn't happen all the time.

Thanks for any advice.
 
Yeah, sounds like the rev limiter to me. First couple times I hit it I thought the same thing. My C5Z is the first car to ever have some sort of device like that. Well at least in a case where I would actually ever hit those high rpms. :hehehe:

I believe that hitting the rev limiter shuts off the fuel supply, so that is exactly the effect you would get.

Try keeping your eye on your tachometer to see if you are red-lining it when that problem shows up.
 
It's probly time for a Sea-Foam treatment!!!!!!It's got gook in the Throttle Body and Injectors!!!:thumbsup: :thumbsup: :thumbsup:
 
ahhh... the old operator error issue. I was afraid someone would say that :yesnod:

Seafoam treatment? Google here I come.
 
Krazy Horse said:
CLICK!!:thumbsup: :thumbsup: :thumbsup:
Click to expand...

Great!
1 question. The post says "remove the tube from the other side of the PCV valve" duh...ok i'm a dummy, but ummm the other side from what?
1 side goes to the valley cover and the other goes to the intake manifold. Which side to I remove the tube from and let suck up the seafoam..my assumption is that it should suck into the intake manifold..I just want some clarification on that before I do it. And I don't want it to suck through the pcv valve, right? Got the seafoam here waiting to do it's job.:shrug01:

Rich is probably right about operator error...rev limiter..but 80k miles..no service record when I purchased it..so most likely the seafoam is a good idea also.
 
sglfladad said:
Great!
1 question. The post says "remove the tube from the other side of the PCV valve" duh...ok i'm a dummy, but ummm the other side from what?
1 side goes to the valley cover and the other goes to the intake manifold. Which side to I remove the tube from and let suck up the seafoam..my assumption is that it should suck into the intake manifold..I just want some clarification on that before I do it. And I don't want it to suck through the pcv valve, right? Got the seafoam here waiting to do it's job.:shrug01:

Rich is probably right about operator error...rev limiter..but 80k miles..no service record when I purchased it..so most likely the seafoam is a good idea also.
Click to expand...
Yes let it suck through the PCV into the throttle body it will clean it too!!:thumbsup: :thumbsup:
 
ok..did the seafoam thing. I little smoke, but not much. Went out for a "sprited" drive. Maybe imagination, but seems smoother, stronger.

1st gear..right to redline, no problem a couple of times.

1st gear, to about 6k and the symptom occured. I'll try to write down what and when happening...maybe see a pattern.

Any thoughts?
 
sglfladad said:
ok..did the seafoam thing. I little smoke, but not much. Went out for a "sprited" drive. Maybe imagination, but seems smoother, stronger.

1st gear..right to redline, no problem a couple of times.

1st gear, to about 6k and the symptom occured. I'll try to write down what and when happening...maybe see a pattern.

Any thoughts?
Click to expand...
Did you put 1/2 the can in your gas tank??:confused:It needs to have 1/2 the can run through with about 10 +/- gal of gas thats the only way it can clean the Injectors! PS the rev Limiter is supposed to come in at between 6550-6700 +/-on a Z06 and 6050-6200 +/- on a LS1!! If it's gook-ed up purdy good you may have to do it again in a week or so,I had to on mine and it only had 39,000 mi. on it!!:thumbsup:
 
Sounds like the fuel filter is clogged. When was the last time you changed it?
Very easy and inexpensive fix. Have seen same symptoms before and it's been the fuel filter.
 
Krazy Horse said:
Did you put 1/2 the can in your gas tank??:confused:It needs to have 1/2 the can run through with about 10 +/- gal of gas thats the only way it can clean the Injectors! PS the rev Limiter is supposed to come in at between 6550-6700 +/-on a Z06 and 6050-6200 +/- on a LS1!! If it's gook-ed up purdy good you may have to do it again in a week or so,I had to on mine and it only had 39,000 mi. on it!!:thumbsup:
Click to expand...

I did. I ran it a little today. Only happened once, in 2nd at about 5800. But didn't seem to last too long. Hopefully when this tank of gas runs through, that'll help. It is a ZO6 and that's about where I thought the rev limiter was supposed to kick in.

I was also sort of thinking fuel filter. I haven't changed the fuel filter yet. Just purchased the car a couple of months ago. Previous owner didn't have much in the way of service records. Thinking I should do that also.
 
sglfladad said:
I did. I ran it a little today. Only happened once, in 2nd at about 5800. But didn't seem to last too long. Hopefully when this tank of gas runs through, that'll help. It is a ZO6 and that's about where I thought the rev limiter was supposed to kick in.

I was also sort of thinking fuel filter. I haven't changed the fuel filter yet. Just purchased the car a couple of months ago. Previous owner didn't have much in the way of service records. Thinking I should do that also.
Click to expand...
I would!!! I change mine about every 25,000 mi!!:thumbsup:I have a 03 Z-51 6 sp,02 Z06,94 LT1 6 sp(ForSale),78 L82 auto cp,and a 69 350/300 3 sp cp 1 of 254!!
 
Krazy Horse said:
I would!!! I change mine about every 25,000 mi!!:thumbsup:I have a 03 Z-51 6 sp,02 Z06,94 LT1 6 sp(ForSale),78 L82 auto cp,and a 69 350/300 3 sp cp 1 of 254!!
Click to expand...

I have a friend that is looking for a vette, tell me about the 94 you have for sale.
Thanks,
Joe B.
 
98 softtail said:
Sometimes the throttle position sensor goes wacky and causes this type of problem.

Joe B.
Click to expand...

hmmm...??

so today...still haven't changed the fuel filter yet..

wot in 1st...6500...no problem, shift to 2nd...wot...about 5000...bogged down...kept throttle down...speed/revs increasing but very slowly..let up on throttle..depressed throttle (not wot)..little bucking and jerking, then things settled down again..

does this sound like throttle position sensor?
 
I think you need to take it to someone who can put a data logger on your car to see what is happening. All we would be doing here is guessing at the cause.....
 
Rich Z said:
I think you need to take it to someone who can put a data logger on your car to see what is happening. All we would be doing here is guessing at the cause.....
Click to expand...

Yeah...i've been thinking about that lately myself.

That might have to wait a little while though.

thanks everyone for your input.
-c
 
sglfladad said:
hmmm...??

so today...still haven't changed the fuel filter yet..

wot in 1st...6500...no problem, shift to 2nd...wot...about 5000...bogged down...kept throttle down...speed/revs increasing but very slowly..let up on throttle..depressed throttle (not wot)..little bucking and jerking, then things settled down again..

does this sound like throttle position sensor?
Click to expand...
Usually a TPS will trip a Light,I wish you were closer to me I'd plug it in to my computer!!! Has it ever had spark plugs?? I know they say that they will go 100,000 miles but you never know what kind of fuel the previous owner run in it!! Plus the more High RPM driving will cut down the Plug life!!!Myself I only get about 65-75,000 miles out of a set!!Also it may not have ever had a fuel filter,I think the book says 36,000 miles on a filter,but I'd have go out in the shop and check!!! My wife would Crap a Brick,this is her first night off in 2 weeks and she is HOT because I'm on the Internet!!!:rofl1: :rofl1: :D
 
Krazy Horse said:
Usually a TPS will trip a Light,I wish you were closer to me I'd plug it in to my computer!!! Has it ever had spark plugs?? I know they say that they will go 100,000 miles but you never know what kind of fuel the previous owner run in it!! Plus the more High RPM driving will cut down the Plug life!!!Myself I only get about 65-75,000 miles out of a set!!Also it may not have ever had a fuel filter,I think the book says 36,000 miles on a filter,but I'd have go out in the shop and check!!! My wife would Crap a Brick,this is her first night off in 2 weeks and she is HOT because I'm on the Internet!!!:rofl1: :rofl1: :D
Click to expand...

Thanks..I'll do the plugs and fuel filter before anything else.

Hey..at least you've got a "HOT" wife :) jk
 
update

Hasn't happened for a while now. I've driven her hard..the only thing I haven't done is wot. 98% throttle...no problem..I'm going to give her another go with wot today and will post.

Purchased plugs, and fuel filter..haven't replaced either yet.

Although tps is supposed to throw code or something...seems logical.
 
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