C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

EGR?

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Old Feb 11, 2002 | 02:26 PM
  #1  
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Default EGR?

My car has been running rough and pinging lately(no codes were set) so I hooked a friends scanner up and everything checked out ok except the EGR and it's running rich. When at idle the EGR reads 0%, as soon as I hit the gas (barely tapping it) it goes to 100% :confused: is that right? Also checked the fuel presure, at idle 36, at WOT 42, and after sitting for more than an hour 32.


Thanks,
Rich
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Old Feb 11, 2002 | 04:24 PM
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Default Re: EGR? (snydcat)

That's about how the EGR reads on my 89. Usually 0 or 100%, rarely I catch a quick something in between.

Don't know what your ping could be, maybe timing off? Have you checked the plugs, I mean for condition. I wonder if it just "thinks" it's running rich, like a bad O2 sensor?

Fuel pressure would be a little low for my 89, it seems to run around 39-40 at idle and more like 48 with the vacuum plugged. Leakdown sounds OK.

Good Luck,

Pete
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Old Feb 11, 2002 | 04:32 PM
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Default Re: EGR? (PeteL)

Yep, it will usually read 0 or 100%. Normally it won't turn on until you're crusing at a stead speed (according to my logs). I wouldn't be worried about it (unless it gets stuck open at 100% for long amounts of time).
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Old Feb 11, 2002 | 05:29 PM
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Default Re: EGR? (PeteL)


Don't know what your ping could be, maybe timing off? Have you checked the plugs, I mean for condition. I wonder if it just "thinks" it's running rich, like a bad O2 sensor?

Pete
It's definetly running rich, I can change the plugs and drive around the block pull'em and their black already(not burning any oil). The timing is right(checked today) also changed the the dist. cap & rotor today . I replaced the 02 sensor, MAF sensor, coil, ignition module and IAC about 6 months ago, something is defenitely not right, I just can't figure it out!

Thanks,
Rich


[Modified by snydcat, 4:31 PM 2/11/2002]
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Old Feb 11, 2002 | 05:40 PM
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Default Re: EGR? (Glock'94)

Yep, it will usually read 0 or 100%. Normally it won't turn on until you're crusing at a stead speed (according to my logs). I wouldn't be worried about it (unless it gets stuck open at 100% for long amounts of time).
I can be going 2mph or 60mph and it stays at 100% (as soon as I touch the gas).

Thanks,
Rich


[Modified by snydcat, 10:45 PM 2/11/2002]


[Modified by snydcat, 10:47 PM 2/11/2002]
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Old Feb 11, 2002 | 06:45 PM
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Default Re: EGR? (snydcat)

Yep, it will usually read 0 or 100%. Normally it won't turn on until you're crusing at a stead speed (according to my logs). I wouldn't be worried about it (unless it gets stuck open at 100% for long amounts of time).

I can be going 2mph or 60mph and it stays at 100% or over(as soon as I touch the gas), at one point on the highway doing 75mph it was reading 135%. :confused: :confused: :confused:

Thanks,
Rich
:eek: :confused: :confused: :confused: 135%???
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Old Feb 11, 2002 | 07:49 PM
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Default Re: EGR? (snydcat)

EGR should not be active when it is still cold. MAF?


[Modified by merrick, 7:05 PM 2/11/2002]
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Old Feb 11, 2002 | 11:46 PM
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Default Re: EGR? (Glock'94)

Scratch that 135%, my buddy that was with me said I was seeing things again :crazy:

Rich
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Old Feb 11, 2002 | 11:55 PM
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Default Re: EGR? (snydcat)

Scratch that 135%, my buddy that was with me said I was seeing things again :crazy:

Rich
:lol: :lol: i was gonna say. If you're seeing 135% your ecm istoast ;)
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