Fox T-Bird/Cougar Forums

Technical => Engine Tech => Topic started by: quicksilver on April 18, 2007, 08:34:12 PM

Title: weird knocking/puffing!! help
Post by: quicksilver on April 18, 2007, 08:34:12 PM
whenever i give my car any amount of gas it starts to knock. do you think it could be a exhaust leak?
Title: weird knocking/puffing!! help
Post by: turbo86xr7 on April 18, 2007, 09:05:24 PM
or possible a rod knock or wrist pin knock.
Title: weird knocking/puffing!! help
Post by: Vantage08 on April 18, 2007, 10:38:13 PM
any luck with skirts?
Title: weird knocking/puffing!! help
Post by: thunderjet302 on April 19, 2007, 03:39:11 PM
You sure it's not pinging form py gas? Check your timing.
Title: weird knocking/puffing!! help
Post by: 5.0willgo on April 19, 2007, 04:31:25 PM
I've had this happen before.
Check all your sensors to make sure no plugs rattled loose. Check your vacuum lines to make sure they are connected and none are split.
Make sure all your plug wires are still attached securely.

Like said before, could be as simple as a bad batch of gas.
Title: weird knocking/puffing!! help
Post by: quicksilver on April 19, 2007, 05:44:10 PM
i just foring any leaks and i just got alot of my sensors changed njot to long ago, like acouple months ago. and the more gas i give my car now the loud it becomes
Title: weird knocking/puffing!! help
Post by: quicksilver on April 22, 2007, 05:44:00 PM
well, its more of a clicking sound, and its not the gas because i ran my car to empty then put new gas in it, drove about 3 gallons out and it still clicks/knocks.
Title: weird knocking/puffing!! help
Post by: daboss351 on April 22, 2007, 05:49:16 PM
go under the hood rev it and find the general area the noise is coming from. Maybe its a valvetrain chatter.
Title: weird knocking/puffing!! help
Post by: quicksilver on April 22, 2007, 06:33:18 PM
it sounded like it was coming from one of the back cylinders
Title: weird knocking/puffing!! help
Post by: thunderjet302 on April 22, 2007, 10:03:47 PM
Is your EGR valve working ok? I've had one go bad and make noise. Or if it's at the back you could have an exhaust leak. That will make a puffing/hiss sound.
Title: weird knocking/puffing!! help
Post by: quicksilver on April 22, 2007, 10:29:51 PM
well, i listend closer and its more of of clicking sound. could it be my enjectors?
Title: weird knocking/puffing!! help
Post by: thunderjet302 on April 22, 2007, 10:32:43 PM
Clicking injector shouldn't be that loud.........
Title: weird knocking/puffing!! help
Post by: quicksilver on April 22, 2007, 10:55:27 PM
oo ok, so could it be a lifter, or rod then?
Title: weird knocking/puffing!! help
Post by: the87cougarls on April 27, 2007, 08:37:56 PM
hey i think i have the same problem ... i hear a knocking noise every time i like rev my motor up ... i hear it on the left side of the engine... (right side if im in the drivers seat) .... i think it might be a lifter idk
Title: weird knocking/puffing!! help
Post by: jcassity on April 28, 2007, 07:26:54 AM
step up with an oil change and use the next higher viscosity, if the problem goes away, then your likely correct and it is a mechanical piece part.

If not, let us know.  I found a couple of emissions solenoids will clatter if not working properly although those are usually located behind the coolant fill tank.

To eliminate that, undo the main red vac line feeding that bank of solenoids and plug it off since it is your main crank case vac signal to all those guys there behind the coolant fill tank.

Retest and if the problem goes away then isolate each vac circuit by plugging off the individual color coded vac line. 

The car my run wierd doing this but all you are doing is testing to make the noise "go away".  If your able to make it go away by removing a vac signal, trace out what parts are tied into that vac system by using your vac diagram.  If you happen to find out is is a vac solenoid,,,,
start car
undo the proper color vac line at the solenoid bank behind the coolant fill tank
spray wd40 in the line to lube up that systems components incase its just a minor wear issue
hook it back up and retest.
the engine vac will suck up the wd40 and lube up any diaphrams or actuating rods ect.

The same trick is applicable in air line systems on larger trucks and what not when actuators or quick dick fittings start acting up.