Egr
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Staging Lane
Joined: Oct 2004
Posts: 57
Likes: 0
From: England UK
Egr I have taken the EGR off my LS6 engine. When I capped off the hole in the manifold the engine started throwing out brown/black smoke, which I assume was because it was running in full rich mode.
Opened the hole in the manifold and the engine ran clean again.
Is this normal, or is there something else I need to be looking at?
Opened the hole in the manifold and the engine ran clean again.
Is this normal, or is there something else I need to be looking at?
On The Tree
Joined: Jul 2005
Posts: 161
Likes: 2
From: Wokingham, United Kingdom
Originally Posted by PaulFLS6
I have taken the EGR off my LS6 engine. When I capped off the hole in the manifold the engine started throwing out brown/black smoke, which I assume was because it was running in full rich mode.
Opened the hole in the manifold and the engine ran clean again.
Is this normal, or is there something else I need to be looking at?
Opened the hole in the manifold and the engine ran clean again.
Is this normal, or is there something else I need to be looking at?
the EGR is the tube goin from the passenger exhaust mani to the intake mani just behind the TB, just to clarify.
When i removed my EGR, it didn't affect my car at all as far as how it ran.
When i removed my EGR, it didn't affect my car at all as far as how it ran.
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I left the EVAP valve in place and disconnected the hose. Pretty much the same as removing the whole thing and plugging the hole. No smoke here. So I would say something else is wrong.
On The Tree
Joined: Jul 2005
Posts: 161
Likes: 2
From: Wokingham, United Kingdom
Originally Posted by PaulFLS6
I have taken the EGR off my LS6 engine. When I capped off the hole in the manifold the engine started throwing out brown/black smoke, which I assume was because it was running in full rich mode.
Opened the hole in the manifold and the engine ran clean again.
Is this normal, or is there something else I need to be looking at?
Opened the hole in the manifold and the engine ran clean again.
Is this normal, or is there something else I need to be looking at?
Might be worth removing the PCV and plugging that hole then re-try (Evap hole plugged). You may be sucking oil into the intake and burning that?
Just a thought
Jim
Thread Starter
Staging Lane
Joined: Oct 2004
Posts: 57
Likes: 0
From: England UK
Does anyone think the problem could be caused by a faulty fuel pressure regulator. I have got a gauge on the regulator, and if it is correct I have too much pressure. I have tried adjusting it to reduce the pressure, but the gauge still indicates too much pressure.
After a minute or so on tick over, the fuel pump starts working harder until the fuel pressure drops to 58 psi and at the same time the engine cuts out.
I presume that if the gauge is correct the engine could be running too much fuel, hence the smoke. Unplugging the evap hole may be allowing more air in and allowing the engine to run leaner.
Just a theory, but does it make any sense?
After a minute or so on tick over, the fuel pump starts working harder until the fuel pressure drops to 58 psi and at the same time the engine cuts out.
I presume that if the gauge is correct the engine could be running too much fuel, hence the smoke. Unplugging the evap hole may be allowing more air in and allowing the engine to run leaner.
Just a theory, but does it make any sense?
On The Tree
Joined: May 2004
Posts: 161
Likes: 0
From: London, UK
When I had mine checked at GD, the 58psi was set for the moment the system is pressurised when the key is first turned (i.e. before engine start). Don't know how the pressure varies whilst the engine is running...
On The Tree
Joined: Jul 2005
Posts: 161
Likes: 2
From: Wokingham, United Kingdom
Paul,
Does sound as if the regulator could be suspect. Might also be worth removing the filler cap to remove any chance of a blocked fuel tank breather causing the problem. Or maybe a hose collapsing therby causing loss of fuel (hence speeding up the pump) - straw clutching maybe?
Jim
Does sound as if the regulator could be suspect. Might also be worth removing the filler cap to remove any chance of a blocked fuel tank breather causing the problem. Or maybe a hose collapsing therby causing loss of fuel (hence speeding up the pump) - straw clutching maybe?
Jim
97 and 98 corvettes had the regulator on the fuel rail. With these, you don't need the regulator near the pump.
98-02 F-bodies and 99+ vettes don't have the regulator on the rail and you have to use a different regulator, a lot of guys use the 99-03 Corvette regulator.
98-02 F-bodies and 99+ vettes don't have the regulator on the rail and you have to use a different regulator, a lot of guys use the 99-03 Corvette regulator.