Bad or wrong Spark plug cause hissing sound
05-06-2010, 04:58 PM
#1
Drifting
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Bad or wrong Spark plug cause hissing sound
I just got my car diagnosed by Chuck at COW (they are great by the way) for a hissing sound from engine bay and I was just told it was due to a bad spark plug or wrong spark plugs.
Last edited by uptown193; 05-08-2010 at 12:51 PM.
05-06-2010, 05:14 PM
#2
Safety Car
Maybe the wrong spark plug wont sit properly in the head so there is air moving in and out???
05-06-2010, 05:27 PM
#3
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When I hear hissing the first thing I look for is vacuum lines that are loose, cracked, or completely off. Then I look for any looseness in the intake, exhaust leaks, and try to go from there.
Maybe the wrong spark plug wont sit properly in the head so there is air moving in and out???
Maybe the wrong spark plug wont sit properly in the head so there is air moving in and out???
05-07-2010, 09:08 AM
#7
Race Director
If the plugs are cross threaded, then they would not be properly installed.
If the plug is not "sealed" with the head, combustion pressure can escape creating a "hissing" sound.
Your engine is just a large air pump.
Leaks on the intake side will be sucking air into the system, and leaks on the exhaust side will be pushing air out of the system.
A spark plug not properly sealed will have both of these effects (depending on what cycle the piston is on).
If the plug is not "sealed" with the head, combustion pressure can escape creating a "hissing" sound.
Your engine is just a large air pump.
Leaks on the intake side will be sucking air into the system, and leaks on the exhaust side will be pushing air out of the system.
A spark plug not properly sealed will have both of these effects (depending on what cycle the piston is on).
05-08-2010, 01:53 AM
#9
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If the plugs are cross threaded, then they would not be properly installed.
If the plug is not "sealed" with the head, combustion pressure can escape creating a "hissing" sound.
Your engine is just a large air pump.
Leaks on the intake side will be sucking air into the system, and leaks on the exhaust side will be pushing air out of the system.
A spark plug not properly sealed will have both of these effects (depending on what cycle the piston is on).
If the plug is not "sealed" with the head, combustion pressure can escape creating a "hissing" sound.
Your engine is just a large air pump.
Leaks on the intake side will be sucking air into the system, and leaks on the exhaust side will be pushing air out of the system.
A spark plug not properly sealed will have both of these effects (depending on what cycle the piston is on).
05-08-2010, 02:29 AM
#11
Instructor
05-08-2010, 02:53 AM
#12
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St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Here's the deal.....
You have an aluminum headed C4 engine. They use LONG REACH GASKETED plugs.
The dick you took your car to the last time for it's spark plugs cross threaded the #2 spark plug hole trying to put a SHORT REACH, NON GASKETED (taper seat) PLUG into a car that dosen't use one.
You're lucky the head didn't have to come off.
For anyone that has worked on a C4 with the stock exhaust manifolds and air pump check valve and plumbing on the passenger side between (angled) plugs #2 and #4 KNOWS FULL WELL that it takes divine intervention to get that spark plug threaded correctly and snugged down with all that emissions crap in the way.
Be thankful that he didn't do any more damage than he did.
It seems to be running much better from what I see, but I'll take it for a ride tomorrow and evaluate it more.
I haven't seen this car for a year or so, I wanna look it over carefully.
BTW...That new paint job sure does look nice!
Chuck CoW
05-08-2010, 12:28 PM
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Ohhh ok Chuck sounds awesome. That is why I am only bringing my car to you. You sure do know what your doing, hands down, unlike some of these other mechanics out there. Thanks again.
At least the paint job came out nice. Btw nice video.
At least the paint job came out nice. Btw nice video.
05-08-2010, 12:40 PM
#14
Safety Car
05-08-2010, 01:06 PM
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05-08-2010, 01:23 PM
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Safety Car
05-08-2010, 02:00 PM
#17
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Oh ok lucky you then. I wish I had the time, skill and place to do my own work. Not only do you save money but it can be fun to do as well as rewarding. Living in the city I can not do anything myself.
05-11-2010, 11:40 AM
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St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Found that coolant leak.......
Found that coolant leak.......on the test ride....That you forgot to tell me about....
We're diggin' in right now.
More on this later today.
Chuck CoW
We're diggin' in right now.
More on this later today.
Chuck CoW