i have a 1991 fox body gt convertible. one day it started making a LOUD hissing noise! had a few people come out and take a look at it. EVERYONE said it was the headers. i replaced the header (almost 800 dollars later) and the noise continues. no one seems to be able to tell me what is really wrong with my car. the noise comes from the back right side of the motor and maybe even towards the back. is sounds exactly like a PIST sound but loud. can anyone please help me.
HELP HELP HELP
- Thread starter javi_smtx1978
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hey buddy i dont know where or who to turn to. maybe you can help! i have white 1991 gt convertible. one day its started making a PIST PIST sound but very loud. had a few mechanics come look at it. each on told me it was the headers. i replaced the headers (almost 800dollars later) and the PIST sound is there. one guy told me it was a lose spark plug. ever had this issue or maybe know what it may be. id appreciate the help . kinda running out of money and this car is my baby.
Is the emissions stuff still attached?
Check the pipe that connects to the back of the heads and the rubber hoses on the emissions pipes, there is another one under the car between the cats.
Check the pipe that connects to the back of the heads and the rubber hoses on the emissions pipes, there is another one under the car between the cats.
The car is pist off. 
A hose with the other end near your ear should narrow the location down quickly.
A hose with the other end near your ear should narrow the location down quickly.
What about a big vacuum leak... Thats a nice car you got there. Whats going on with the rear bumper
manicmechanic007
5 Year Member
That is my thought too
Check the pipe between the rear of the heads for the thermactor and the one way valve on top
Get a mechanics stethoscope
Check the pipe between the rear of the heads for the thermactor and the one way valve on top
Get a mechanics stethoscope
I had one go out and blew out a little coolant out, made a hissing noise. Got lucky and didn’t mix with oil or anything
mikestang63
SN Certified Technician
with the engine OFF, you can make a cheap home made smoke machine with a $7 Harbor Freight syphon pump and a cheap thin $1 stogie. Take the hose off the vacuum pump that PUSHES the air and stick it in one of the exhaust pipes and tape it in the pipe. Tape over both exhaust pipe openings. Then light the stogie and stick the unlit end in the opening of the vacuum pump that sucks in the air and start pumping away. it will push the smoke from the stogie up through the exhaust and back up to the headers and engine block. If you have someone as a helper, have them look under the car and under the hood as you are pumping for smoke coming out where any leak is. You can also do the exact same thing by hooking up the hose from the pump to any vacuum hose going into the intake manifold- from the brake booster, PCV valve, purge cannister. As you pump in the smoke again look for any smoke coming from the engine, hoses,, etc. That would be a vacuum leak.
I have used this cheap pump for years and it works wonders finding these types of leaks.
www.harborfreight.com
I have used this cheap pump for years and it works wonders finding these types of leaks.
Multi-Use Transfer Pump
Amazing deals on this Multi-Use Transfer Pump at Harbor Freight. Quality tools & low prices.
www.harborfreight.com
Do you have another budget friendly method without tobacco? At least a pipe does not smell as bad.with the engine OFF, you can make a cheap home made smoke machine with a $7 Harbor Freight syphon pump and a cheap thin $1 stogie. Take the hose off the vacuum pump that PUSHES the air and stick it in one of the exhaust pipes and tape it in the pipe. Tape over both exhaust pipe openings. Then light the stogie and stick the unlit end in the opening of the vacuum pump that sucks in the air and start pumping away. it will push the smoke from the stogie up through the exhaust and back up to the headers and engine block. If you have someone as a helper, have them look under the car and under the hood as you are pumping for smoke coming out where any leak is. You can also do the exact same thing by hooking up the hose from the pump to any vacuum hose going into the intake manifold- from the brake booster, PCV valve, purge cannister. As you pump in the smoke again look for any smoke coming from the engine, hoses,, etc. That would be a vacuum leak.
I have used this cheap pump for years and it works wonders finding these types of leaks.
Multi-Use Transfer Pump
Amazing deals on this Multi-Use Transfer Pump at Harbor Freight. Quality tools & low prices.
You could use some pot, problem is after a few minutes you won't care if it leaks or not if you even remember why you did it. 
if you even remember why you did it.
Burning weeds still smell bad. But it at least reminds me of the haze at live concerts.You could use some pot, problem is after a few minutes you won't care if it leaks or not
Patrick Sullivan
Member
with the engine OFF, you can make a cheap home made smoke machine with a $7 Harbor Freight syphon pump and a cheap thin $1 stogie. Take the hose off the vacuum pump that PUSHES the air and stick it in one of the exhaust pipes and tape it in the pipe. Tape over both exhaust pipe openings. Then light the stogie and stick the unlit end in the opening of the vacuum pump that sucks in the air and start pumping away. it will push the smoke from the stogie up through the exhaust and back up to the headers and engine block. If you have someone as a helper, have them look under the car and under the hood as you are pumping for smoke coming out where any leak is. You can also do the exact same thing by hooking up the hose from the pump to any vacuum hose going into the intake manifold- from the brake booster, PCV valve, purge cannister. As you pump in the smoke again look for any smoke coming from the engine, hoses,, etc. That would be a vacuum leak.
I have used this cheap pump for years and it works wonders finding these types of leaks.
Multi-Use Transfer Pump
Amazing deals on this Multi-Use Transfer Pump at Harbor Freight. Quality tools & low prices.
Did he fix his psssst noise? buy a can of starting fluid! spray the hoses, it will either pick speed or stall out when ya spray near the leak
Patrick Sullivan
Member
Patrick Sullivan
Member
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