Skip the auto shop - Our mechanics make house calls

Q: An exhaust leak on 1994 Chevy V8 with idling

asked by on

I've got an exhaust leak on a ‘94 Chevy V8. I've checked the exhaust pipe, no leaks, and I couldn't feel where the gas was coming from. Could that be an intake manifold? Also it idles a little higher than normal. Any advice?

A: In the intake manifold, you’re not going to...

In the intake manifold, you’re not going to get exhaust leaks because that’s the intake. All the systems there are the stuff that’s coming in, not the stuff that’s coming out of the exhaust.

You can hear the exhaust leak. You might try my old trick. I’ve got a video called ’’Finding engine vacuum leak with a cigar.’’ You basically get a cigar, you blow it to any of the vacuum lines and if there’s leak somewhere in the system, the smoke’s coming out. In that case, you blow it in the exhaust in the back, as somebody blows smoke in the exhaust and wherever the leak is--you are going to see smoke coming out, because the smoke comes out of holes. You might give that a try.

I’m a professional mechanic, of course when I do it--I use a smoke machine which is easier. I just plug that in the exhaust and it fills the exhaust with the smoke and I can see where it’s leaking when the smoke comes out. They did that in 1700s to find the sewer leaks in houses. They would blow smoke in the sewer system and see where the smoke was coming out. Though this may be considered unconventional now, it’s a pretty tried-and-true system.

If you’d like, your best bet may be to have a certified technician look at your system. They will be able to diagnose your leak and come up with the appropriate repairs for your vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: code p1518

Hello there, many faults will cause the P1518 code to be found on your Ford. Without the model and year I can only offer very general advice. The P1528 code is indicating that the intake manifold runner control fault stuck...

Q: Brakes going out.

When your brake pedal goes to the floor you are experiencing a severe brake failure and you definitely need to take care of it right away. If you cannot build pressure in the brake system by pumping the brake pedal...

Q: Brake pedal hard to push after having disc brakes installed.

If a fluid issue or the master cylinder was at fault the symptom would be the opposite of yours. If the pedal is hard to push the most likely cause is a faulty check valve for the power brake booster....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...