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Hissing noise out my exhaust pipe when my 99 f350 first starts up

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This is common with aftermarket diesel exhaust systems, it's the Exhaust Back Pressure Valve which will stay closed for a few seconds on a cold startup, it should go away after a few seconds, and shouldn't be a problem.

Posted on Dec 03, 2012


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Posted on Jan 02, 2017

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SOURCE: ford f350 problem see details for summary thanks

Stick in key to "on" position, right before starting the car
Leave it in for about 10 minutes. After 10 minutes, than start it up to reset your system.

I was wondering if you had changed the battery or had problems with a security system lately?
When you change a battery or have security system problems, this usually has the same effect as you are having with your truck

Posted on Jan 29, 2009

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SOURCE: 99 nissan sentra exhaust

It is best to weld this back in place, sometimes you'll nedd an extra piece of pipe to correct this problem

Posted on Jun 15, 2010

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I have a p1218 code on my 02 jeep grand Cherokee Laredo. My jeep is making a hissing noise what is it?

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Lack of power using way more fuel and hissing by the firewall , i unpluged hose off wste gate box , pretty well same thing happening, maybe bit les power

One of your turbo boots or intake boots is off or has a hole in it! Could be either cracked or has come loose of the clamp. This is your hissing noise your hearing. It means the turbo is making the boost but it is not getting to your engine. Its leaking out the boot. No boost no power! Poor performance and bad fuel economy too. You need to check all of your boots and clamps. If you say it is by the firewall then start on the side that the hiss seems to be comming from. DONT unplug your turbo waste gate as you can damage your turbo or other engine components! your waste gate allows excess pressure not needed on your exhaust side to escape.

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1 Answer

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If you have more than 100,000 miles on the truck, it sounds as if your muffler is getting wore out. That is if the noise you hear is coming from the exhaust pipe.

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Exhaust leak

simple test. like beverly hills cop put a cloth or a potato in tail pipe(clog it up. have someone start cat and with t hood up, you'll hear where the noise is centrally located. don't do it for long, as we don't want damage. or take it to your local mechanic. no it's not a problem; things just wear out with age.

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Ford f350 problem see details for summary thanks

gas pedal is a cable check near throttle body
there could be a fuse for the door locks or its the switch or actuator not related to the gas pedal
with the hissing sound
What i have encountered while doing compression checks while engine cranking and there is a hissing noise from exhaust it means there is a exhaust valve not seating properly or the valve seal is going bad.

Jan 29, 2009 | 1991 Ford F350

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