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Topic: weird knocking/puffing!! help (Read 1367 times) previous topic - next topic

weird knocking/puffing!! help

whenever i give my car any amount of gas it starts to knock. do you think it could be a exhaust leak?
1988 LX coupe. a dressed up motor with full exhaust and BBK shorties with flowmasters, BBK CAI, accufab 65mm tb, HO upper intake, cobra valve covers.

weird knocking/puffing!! help

Reply #1 –
or possible a rod knock or wrist pin knock.

weird knocking/puffing!! help

Reply #2 –
any luck with skirts?
1988- 3.8- T-bird- sold 2005 Grand Prix, GTP- COMP.G MODS: Inferno Hood, GXP spoiler, Liquid Metal Wheels,K&N Intake,LED taillights,LED reverse lights, LED interior lights, 180*,605s, Pacesetters :burnout:

weird knocking/puffing!! help

Reply #3 –
You sure it's not pinging form py gas? Check your timing.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

weird knocking/puffing!! help

Reply #4 –
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.

weird knocking/puffing!! help

Reply #5 –
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
1988 LX coupe. a dressed up motor with full exhaust and BBK shorties with flowmasters, BBK CAI, accufab 65mm tb, HO upper intake, cobra valve covers.

weird knocking/puffing!! help

Reply #6 –
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.
1988 LX coupe. a dressed up motor with full exhaust and BBK shorties with flowmasters, BBK CAI, accufab 65mm tb, HO upper intake, cobra valve covers.

weird knocking/puffing!! help

Reply #7 –
go under the hood rev it and find the general area the noise is coming from. Maybe its a valvetrain chatter.
RIP 1988 and 1990 Lincoln Mark VII LSC
I welcomed the dark side and currently am driving a 2000 Dodge Durango SLT plus, with a 5.9, Code named project "Night Runner"
Shes black on black, fully loaded, with headers, 180 tstat, e fan, straight exhaust into a cherry bomb vortex ler, full tune up, ported intake and T/B, MSD coil, and round aircleaner.
Mods to come: Fully rebuilt and heavily modded 46RE, and a richmond rachet locker.
my $300 beater ;)
R.I.P Kayleigh Raposa 12/18/90 - 2/24/07

weird knocking/puffing!! help

Reply #8 –
it sounded like it was coming from one of the back cylinders
1988 LX coupe. a dressed up motor with full exhaust and BBK shorties with flowmasters, BBK CAI, accufab 65mm tb, HO upper intake, cobra valve covers.

weird knocking/puffing!! help

Reply #9 –
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.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

weird knocking/puffing!! help

Reply #10 –
well, i listend closer and its more of of clicking sound. could it be my enjectors?
1988 LX coupe. a dressed up motor with full exhaust and BBK shorties with flowmasters, BBK CAI, accufab 65mm tb, HO upper intake, cobra valve covers.

weird knocking/puffing!! help

Reply #11 –
Clicking injector shouldn't be that loud.........
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

weird knocking/puffing!! help

Reply #12 –
oo ok, so could it be a lifter, or rod then?
1988 LX coupe. a dressed up motor with full exhaust and BBK shorties with flowmasters, BBK CAI, accufab 65mm tb, HO upper intake, cobra valve covers.

weird knocking/puffing!! help

Reply #13 –
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

weird knocking/puffing!! help

Reply #14 –
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.