SG Lou

Posted this in the Tech section but I figured I'll post it here as well...

I will try and describe this as best as I can.. lets say I pull away from a corner after making a turn onto a busy road at normal seed and decide to mash the pedal full throttle....i get a sudden, split second lag, as if it's starving for fuel / air or both, and then it takes off like a bat out of hell.
Any idea what can be causing this. It's driving me nuts as I can't seem to find a cause.

Fcar 98

There is no throttle cable. There may be an electronic lag in the signal. Not sure if that is the proper way to describe the condition.

CactusCat

Any recent mods to your car? Did this occur shortly after some mods? How long has thing been happening?

CactusCat

I'd also make sure my MAF sensor is clean. Also check your air filter and make sure it's clean as well.

Fastbird

I think in pretty much every DBW car I've been in/around, the one constant that comes to mind is a momentary lag on a sudden sharp throttle opening. I've never seen one have faster throttle response than on a cable actuated car.

CactusCat

Something else you might consider. Get a tuner to go with you and log this event. That will show what is happening and you can get it fixed. Could be that your A/F ratio is messed up and the computer has to compensate briefly until it "figures" it out.

SG Lou

No Mods what so ever, Cleaned throttle body / MAF beginning of summer, along with a new AF

That could very well be....it's just annoying. You like to have instant response when you mash the sucker to the floor

CactusCat

There are tons of DBW cars that do not have this momentary lag. My 98 is highly modded (so more of a chance for problems) but there is no lag anywhere, nor was there any lag when it was pure stock. Your problem might be from an injector that is starting to go bad or many other things. That's why it's best to log this event.

R1 Rider

Turn the traction control off and try again..

bwill03z

I would say a good dyno tune is the best "fix"

donald4972

Is this an A4 car, that is 'shifting down' before you feel the strong pull?

OldManBeach

Hi SgLou! I haven't actually checked this out on my Vette yet, so I hope I am not too far off base, but I had a recent situation with my DD where the throttle response seemed off. Turns out the TB was filthy. Once I cleaned it with TB cleaner it definitely felt more responsive. Could that be your issue?

neutron82

this is what I was thinking... I have a 6 speed and have never had an issue with throttle response, actually it's pretty damn good and smooth in my opinion... any competent tuner should be able to fix any little nuances like that without any fancy "boosters" or add on devices

SG Lou

Cleaned TB, MAF and replaced the filter

SG Lou

yes it's an A4.

madmatt9471

This is not because it is an A4 vehicle etc -

There is a little something more going on here -

There are pretty much three components to the DBW setup:

(1) TPS - Throttle Position Sensor on the TB
(2) TAC Module by the PCM passenger inner fender well (go between TPS and Throttle Pedal)
(3) Throttle Pedal Sensor

Make sure that these do not have any moisture or any corrosion on the connections -

Plus make sure there is no moisture and no corrosion on your MAF connection - make this your starting point

If all is good and you have "NO" codes - then your best bet like stated is going to be to DATA Log your Vette, a competent tuner/shop will need to be used to do this -

This should not be happening in a DBW system, especially since NO mods have been made -

Have you cleaned the motor off - carwash, water etc?

Thanks,Matt

SG Lou

Matt, I have NEVER power washed or used water to clean the engine compartment. I did how ever clean areas of the heads, along intake manifold and around oil filler tube to remove spilled oil from the previous owner using carb. cleaner. I did not use it anywhere near the MAF or TB, but that was in the spring of 2011... I have a stock air intake although i did mod another cover with a series of holes in it for a little better air flow but I don't think that's the problem as I had this throttle response issue before the mod was done and that's what prompted me to clean the TB and MAF with this stuff:

madmatt9471

Okay -

What you are going to have to do at this point is get an appointment with a reputable tuner and have him smooth this throttle situation out -

It has happened to others before and it can be corrected -

Just make sure there are no leaks around the manifold or any parts/vacuum lines that have come off - this will also cause the hesitation you are experiencing -

Thanks,Matt

SG Lou

OK, Thanks for your help

SaberD

make sure all the hose clamps are tight on your intake. also check that there are no loose pcv hoses/ vacuum lines.

I would suggest taking the car in for a tune regardless. It really wakes up an automatic.