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 goin...

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・Save up to 30%

Get a quote

What others are asking

Q: Please help car has a skip and slows up when trying to gain speed

If I understand your question correctly, when you say it has a skip, I assume you are saying it has a misfire. With new ignition coils installed we can reasonably assume this is not the problem. The other issue may...

Q: A/C drier - accumulator

Your vehicle will only have the receiver drier and it will be near the condenser in front of the radiator. The 1994 model year was the year Mazda may have had either one of the parts but not both. You...

Q: chugging and squeaking sound when i accelerate

Hello. There are a lot of things that can cause this to happen. It really depends on if it is occurring only when the vehicle is moving or also if you just rev the engine in park. If the Check...

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 to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...