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2003 toyota echo making a hissing sound under the engine cover almost sounds like air is escaping from somewhere any suggestions please help low budget and mechanics want 100's just to check thank you

Hi Edward, Im AL the owner of Big As Auto Repair.

Edward, usually when there is hissing under the hood its because you have a broken vacuum line or the line could be cracked or simply came off. Check every vacuum line for these issues and you should find the problem. Another way to find the vacuum leak is to spray "Carb-Cleaner" around the intake manifold until you here a change in idle to find its location. Hope this helps and please visit my auto-repair-website at:

Nov 14, 2015 | Toyota Cars & Trucks

1 Answer

When starting it makes a popping sound.

You have to find out where the popping sound is coming from, it can be a bad intake or exhaust valve or bad lobe on the cam, Ignition timing, rich or lean fuel mixture, or just a simple vacuum leak,
check all the hoses on your engine, and listen for hissing while it runs, vacuum leaks are often found by hearing a hissing, even when the brake booster leaks and you hear it hissing by your feet while you drive,,
Good luck, if you find anything and have more questions, leave me a comment, I'll help you!

Mar 24, 2015 | 2003 Saturn ION

1 Answer

Starts and idles fine but has loss of power during driving and I hear a hissing sound I never heard before

A hissing sound is usually a vacuum leak in the intake system. Look for loose hoses (with the engine running) and the source of the hiss. If you find a nipple hissing, it may have lost a cap (it may be a vacuum test port) that prevents air entry.
An aside note: be sure to change the timing belt at the proper time. If it breaks while running, the engine with suffer severe valve and piston damage (many penny!)

Nov 25, 2009 | 2001 Daewoo Lanos

2 Answers

Hissing sound from under the driver's side of

Yes sound like brake booster. most of time when booster is going bad makes hissing sound when brake applied.But should not make any kind of air leakage noise at all.Replace brake booster.Hope this was helpful for you.

Nov 23, 2009 | 2003 Ford Expedition

1 Answer

2006 VW Jetta Diesel, Hissing noise when idleing or accelerating. Only seems to do it at lower RPM's, seems to have so effect on performance

I just went through this problem. Believe it or not their is a air conditioner for the turbo. Located on the back side of the turbo a real mother to change. Almost $400 for the part alone and another $200 for the install at the VW dealership. I recommed that you go to them and get it done instead of a back yard mechnanic or yourself. Al

Oct 15, 2009 | Volkswagen Jetta Cars & Trucks

1 Answer

Car wont start

It sounds like the timing belt snaps based on the hissing sound that you described............if it cranks lightly without much load then it is confirmed the timing belt has snapped.

Oct 05, 2008 | 1991 Honda Accord

1 Answer

1988 Suzuki Samurai Hissing Sound Under Hood

hi its definatley an air leak if you have replaced the hoses i suggust the next thing you try is see by tighting the carburrettors nuts that hold it to the manifold as these come lose and **** air do the same with the manifold bolts i suspect you will find them loose if not then change the gaskets one at a time with the cheapest first the carburretors then the manifold you may want to go to your car shop and ask for an air leak spray or they may use some other kind of method but basicly you spray it round the carb/manifold and watch to see where the leak is yates210456

Aug 05, 2008 | 1988 Suzuki Samurai

1 Answer


Hissing or scratching sound is usually related to consumed brake pads/ shoes or deformed disks.
Usually you fix it by replacing brake pads, in some case you also need to change the disk, but this is less frequent, and happens when you keep circulating with consumed brake pads for many miles.
If you have a vehicle with brake shoes instead, you need to replace and calibrate brake shoes .

Jun 22, 2008 | 2003 Renault 181

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