Air under the pedal of my VS Series II 3.8L Please help

[ruredi]

Hi Fellas howz it goin...?

Got this problem with my VS (Series II 3.8L Auto)...Jump on the freeway and once I hit between 95-100km it instantly feels like there is air under the pedal. The note of the engine changes and it kinda makes it hard to sit on 100 if you know what I mean. It sounds empty and it just goes quite. I have a redback 2.5 sports exhaust fitted so its very noticable. While at that speed, I boot it and the pedal is all air and it will take around 8-9 seconds before I get a response from it. around the street its fine. If ive already booted it from low speed building up speed to 100 it wont do it...it just rockets past 100 its only when I go onto the freeway and edge onto 100 to sit there. It's quite annoying. I've recently done a service on it. Oil, Oil Filter, Fuel Filter, Top Gun Leads, Plugs, K & N Filter, New Power steering pump & CAI. Cleaned out the throttle body and IAC. any help on this would be much appreaciated...you guys have always managed to figure out what it is so I doubt you will have any trouble with this one.

Cheers, Joe

[hako]

Fuel pressure regulator?

[ruredi]

Fuel pressure regulator?

??? Will need to fill me in a bit there mate...where is that...how hard to change...cost etc...?

[semi]

any possibility that you might have done something to cause the TB to stick maybe? Just an idea, not really based on much

[Patrio7]

can you describe air? as in you you give it a little and nothing happens?

[ruredi]

can you describe air? as in you you give it a little and nothing happens?

no the throtle body and IAC were fine it happened a bit after that

air as in...it feels like there is nothing under the pedal at all...its hard to explain but its very obvious when it happens...u can feel the difference under the foot and yeah when i give it nothing happens for like 6-7 seconds where as before it instantly used to react

[Patrio7]

re-tension throttle cable?

[ruredi]

re-tension throttle cable?

I dont think that would be it because its only when i reach a certain speed...that being 95-100km. i could have the throttle in any position but if its sittin at that speed it will do it.

[Patrio7]

yeah i figured... not sure. maybe your transmission doesnt want to kick down? i know mins is very unwilling to get into 4th at 80 and when it does it groans when i give a little to bring it up to 90-100

[ruredi]

yeah i figured... not sure. maybe your transmission doesnt want to kick down? i know mins is very unwilling to get into 4th at 80 and when it does it groans when i give a little to bring it up to 90-100

hey yeah I think it could be something to do with that...because ive noticed when I go through the gears manually its very hesitant or takes a while to kick in to 3rd and 4th. How could this problem be fixed...?

[Infus10n]

hey yeah I think it could be something to do with that...because ive noticed when I go through the gears manually its very hesitant or takes a while to kick in to 3rd and 4th. How could this problem be fixed...?

service your transmission, perhaps a shiftkit too.... with a few other goodies... stally, corvette servos....... just an idea but all cost $$$.

[Patrio7]

or if you have a grand or two, get a reconditioned tranny thrown in [ doesnt the VT one work in the VS? ]

[hako]

Hi Fellas howz it goin...?

Got this problem with my VS (Series II 3.8L Auto)...Jump on the freeway and once I hit between 95-100km it instantly feels like there is air under the pedal. The note of the engine changes and it kinda makes it hard to sit on 100 if you know what I mean. It sounds empty and it just goes quite. I have a redback 2.5 sports exhaust fitted so its very noticable. While at that speed, I boot it and the pedal is all air and it will take around 8-9 seconds before I get a response from it. around the street its fine. If ive already booted it from low speed building up speed to 100 it wont do it...it just rockets past 100 its only when I go onto the freeway and edge onto 100 to sit there. It's quite annoying. I've recently done a service on it. Oil, Oil Filter, Fuel Filter, Top Gun Leads, Plugs, K & N Filter, New Power steering pump & CAI. Cleaned out the throttle body and IAC. any help on this would be much appreaciated...you guys have always managed to figure out what it is so I doubt you will have any trouble with this one.

Cheers, Joe

Re-reading your post - you're not confusing this with the normal operation where once the car reaches cruising speed - above 80kph in D, the torque converter locks solid and the pedal can feel kind of dead?. This lockup happens after the speed has remained the same for a few seconds and the idea is the auto box is now 'solid' and drive is direct to the back wheels - this saves fuel. I'm not sure, but I'd guess that the computer (ECU) recognises you are in D, above 80kph and the converter is locked so it does something to the throttle (electronically) so that small pedal movements have no effect on the speed.....sort of de-sensitises the pedal. Dunno if you understand what I'm trying to say but in a nutshell I think maybe what you are experiencing is normal. (hope so!)

[ruredi]

Re-reading your post - you're not confusing this with the normal operation where once the car reaches cruising speed - above 80kph in D, the torque converter locks solid and the pedal can feel kind of dead?. This lockup happens after the speed has remained the same for a few seconds and the idea is the auto box is now 'solid' and drive is direct to the back wheels - this saves fuel. I'm not sure, but I'd guess that the computer (ECU) recognises you are in D, above 80kph and the converter is locked so it does something to the throttle (electronically) so that small pedal movements have no effect on the speed.....sort of de-sensitises the pedal. Dunno if you understand what I'm trying to say but in a nutshell I think maybe what you are experiencing is normal. (hope so!)

Yeah it does sound practical what your saying but it never used to do it before and on other commodores I drive it doesnt do it. I think it may be my exhaust because it seems to have all the effect somehow its hard to explain. But when i let my foot off the accelerator and let it decrease speed it makes this noise from the exhaust...hard to explain but see if you can make sense of this..."mmmm...mmmm....mmm...mmmm...mmm" like its frequent and its got like 1 second intervals...??

[VS CALAIS]

just a thought .... trans slip maybe ??

[mess666]

Have you got cruise control? If so, rip out the fuse for it and see if it still does it.

[ruredi]

Have you got cruise control? If so, rip out the fuse for it and see if it still does it.

no cruise control its only an exec.

[boojak87]

Ohh yessss low grumbles! Not the exhaust, i can promise you that! I get the same thing. No matter how far down you put the pedal to the floor, there's no kick down, and only gradual increase in speed. From what i've felt it is the tranny. Double tap the accelerator pedal, usually kicks down, but best to get a tranny service. Lol i'm getting one done tomorrow as a matter of fact! Will tell you if that little thing happens again. Haha how mean does it sound when you have backed off the accelerator to about 85-90 still in 4th and you get that grumble! lol i like it! Anyways, will update you in a couple days to let you know how it went.

Cheers,
Boojakz.

[ruredi]

Ohh yessss low grumbles! Not the exhaust, i can promise you that! I get the same thing. No matter how far down you put the pedal to the floor, there's no kick down, and only gradual increase in speed. From what i've felt it is the tranny. Double tap the accelerator pedal, usually kicks down, but best to get a tranny service. Lol i'm getting one done tomorrow as a matter of fact! Will tell you if that little thing happens again. Haha how mean does it sound when you have backed off the accelerator to about 85-90 still in 4th and you get that grumble! lol i like it! Anyways, will update you in a couple days to let you know how it went.

Cheers,
Boojakz.

hey thanks mate...just quickly whats involved in a transmission service and whats the cost...?

[blaze]

do u have to copy n paste everythin?

[ruredi]

do u have to copy n paste everythin?

what are you talking about?

[boojak87]

Okay, had a tranny service the other day. Problem solved. Kicks into gear harder and with a lot more definition, acceleration vastly improved, and also regained some top end torque. Umm they actually do quite a fair bit, change over oils check and re-tighten bands and stuff...I can't remember exactly what was on the list of things...but i'd say there were a good 10-12 items that they either check or replace. Set me back $95 for the tranny service, but make sure u shop around...I got various quotes between $120 all the way up to $185!!! And then i tried this place and they quoted $95, so i was laughing at the end of it all .

Cheers,
Boojakz.

[ruredi]

Okay, had a tranny service the other day. Problem solved. Kicks into gear harder and with a lot more definition, acceleration vastly improved, and also regained some top end torque. Umm they actually do quite a fair bit, change over oils check and re-tighten bands and stuff...I can't remember exactly what was on the list of things...but i'd say there were a good 10-12 items that they either check or replace. Set me back $95 for the tranny service, but make sure u shop around...I got various quotes between $120 all the way up to $185!!! And then i tried this place and they quoted $95, so i was laughing at the end of it all .

Cheers,
Boojakz.

Cheers thanks mate...will definetely be something I try...

[ruredi]

Okay, had a tranny service the other day. Problem solved. Kicks into gear harder and with a lot more definition, acceleration vastly improved, and also regained some top end torque. Umm they actually do quite a fair bit, change over oils check and re-tighten bands and stuff...I can't remember exactly what was on the list of things...but i'd say there were a good 10-12 items that they either check or replace. Set me back $95 for the tranny service, but make sure u shop around...I got various quotes between $120 all the way up to $185!!! And then i tried this place and they quoted $95, so i was laughing at the end of it all .

Cheers,
Boojakz.

Hey dude...want to get that service done as its pissing me off majorly...where abouts are you located...? If in melbourne...where abouts did you get that done?