Loud noice when accelerating on 96 3.2tl. Once I release the gas pedale the car is dead quiet. Is this normal or should acceleration be quiet?

 

How loud is it getting? And is it in sync with the RPMs? What kind of sound?

It's obviously going to get louder under acceleration (rising RPMs, burning more fuel) but its a mattter of it just being the sound of the fuel burning, or the rods bending

 

Is this past 4000 rpms?

And is your intake stock?

 

Noise is in sync with RPM's. Sounds like a loud growel...."VRRROOOOOOOOMM." This happens even at low RPM's below 3.
What is the intake stock Ken?

Thanks for the input.

 

Open up the hood, left hand side towards the headlight. You should see a black plastic box where the air comes in. Make sure its fully attached to get the least noise possible.

 

Probably muffler issues... After getting my muffler and tips replaced, my car was as quiet as the dead of night.

 

really?

I just thought it was the VTEC kicking in. I have loud noises to when I accelerate past a certain point.

 

uhhh...... our cars dont have VTEC

 

No VTEC on either engine, though both have a variable intake.

 

No VTEC

I always thought we did....damn didn't notice. That shows how much I know about cars.

 

hmm.. maybe thats whats causing my car to make this noise.. whenever i rev it up to 4-5k right before the tranny shifts to the next gear it kinda makes a "woot" noise (kinda hard to describe it) and then goes into the next gear

 

There IS an extra rush of air coming in, both the 2.5 and 3.2 engines use flaps to vary the intake path for more low end torque and high end horsepower. So you'll notice a change in the engine sound at exactly 3900 rpms in the 3.2

 

Straight from Honda:

VARIABLE INDUCTION SYSTEM
For the 3.2-liter, a boost for both high-end power and low-end torque is provided by a Variable Induction System, similar to that used in the NSX. A unique two-level intake manifold-made of aluminum to save weight-provides three possible paths for air being inducted into the engine. The path is selected by three butterfly valves that are electronically controlled and actuated by intake vacuum. When the engine is running at less than 3300 rpm, air for the two banks of cylinders is strictly separated and is led through the longer of two intake paths for optimum resonance charge effect at low engine speeds. Between 3300 and 3900 rpm, the two larger butterflies open and air flows through the shorter path for best resonance effect in the midrange. Then at 3900 rpm, the third butterfly opens to provide a large plenum serving all cylinders. At this point, the resonance effect is reduced, but an inertia ram tuning effect takes over to boost high-end breathing and power output.

The 2.5 TL inline-5 cylinder engine is tilted to the right, 35 degrees from vertical. This has allowed the engineers to design a manifold with long, tuned intake runners to optimize engine breathing. Based on technology developed for the NSX, the intake manifold is a dual-stage design and increases both low-end torque and high-end horsepower.

Below 5000 rpm, the cylinder is fed by the primary runner. Above 5000 rpm, however, the engine vacuum opens a butterfly valve, allowing the passage of air through a secondary runner. This increases the volume of air entering the combustion chamber and also produces an inertia ram-tuning effect for more complete cylinder filling, increasing both horsepower and torque.

 

I've never even gone above 3500 rpm.

 

I wouldn't want to see the carbon buildup in YOUR engine.... :S It's actually GOOD for an engine to give it a good run once in a while. When I got my car from my dad, I don't think he'd ever gone over 4000 RPM, and as a result, at only 5 years old, it almost failed emissions. Two years later after my somewhat harder drving... she passed with flying colours. THere is obviously a limit as diriving hard causes more wear and tear, but the more than occasional run up to the redline will help clean out your engine. I'm not sure if they still do, but the old Prosche manuals used to actually recommend taking your car ono the highway once a month and giving it a good run to clean out the carbon deposits.

 

Its good exercise for your car to be pushed just a bit now and then.

 

Looked under the car today and noticed a little smoke coming out the middle of the muffler. Could it be a hole in the muffler causing loud acceleration?

 

I had a slight hole in my exhaust manifold and it sounded like an old Atari game.

 

you know seafoam does that stuff actually work any good for your car for like cleaning out carbon deposits and stuff??

 

its also pretty fun BTW, love the avtar.

"Im so roooonnry, oh so roooonrrryy....."

"How u like that, how u ike it now, Hans BLIX"

 

seafoam helps a lot especially if your car has high miles and lots of carbon build up. I convinced my friend to do it in his accord and it made a really big difference. But there is a downside, if the carbon buildup is preventing oil from leaking and you run seafoam it might make it so the oil will leak through. But my accord had 150k the first time I used it and now I have ~165k and I haven't had problems since.

 

Thanks.. had to change it.. I got numerous comments saying that it wasnt "me"

 

How do you use this seafoam ? Is there a step by step ? Let me put it this way, what is a seafoam ? where do you put it ?