conv90

I’m systematic having a code 32. (EGR). I disconnect the battery and I can live 2 or 3 days without the code. Then it will reappears again. I tried to stay WITHOUT this code for 2 entirely weeks the last time, but now I have again this code.
There is no doubt I have a problem with the EGR valve or solenoid.
My question is: If burn a chip with the flag code 32 unchecked I can get rid off the SES light, but the problem still be there. If I disable totally the EGR, changing all the related parameters and tables I will have a car that acts different from a car with the same Chip EGR modification but with a EGR system originally operating properly?
I explain:
My car is the car A
The other car is the car B
The car A has the EGR problem described above.
The car B has an EGR system perfect.
The A owner disable the EGR via chip modification
The B owner disable the EGR via chip modification
The two cars runs the same (EGR speaking)?
Thanks
-Beppe-

Pete K

9 times out of 10 the code 32 is a bad egr diagnostic switch. They are cheap,$7 here locally, and fail often. Have you checked this? Hate to see you spend alot of time and effort, not to mention money, to solve this. @ $7 it is cheaper to change it than diagnose it. Hope this helps.

SunCr

Check vacuum lines, especially the tee from the charcoal canister near the thermostat housing. Not a terrific idea to disable it without other changes. It lowers combustion temps and some ECMs advance spark when egr is on thereby increasing the liklihood of detonation.

conv90

Where is the diagnostic switch?

conv90

So you are saying that there is a line vacuum that starts from the charcoal canister (in the left front corner of the engine compartment) and goes in to a fitting near the thermostat housing (under the plenum)
I will check!
Thanks

onedef92

What about a 92? I think mine might be faulty, too, and want to replace it.

65Z01

If you disable the EGR function at least the ECM will not check for EGR on at start up nor for EGR on when called for during cruzing. But I'm not sure if the ECM will activate the EGR during cruze.

There is an EGR test method on my site with an explanation of the system operation.

Pete K

The diagnostic sw is on the rear pass side of motor. Looks like a single small spark plug with a wire exiting the top.

conv90

Thanks, I always appreciate your info on your site (it's on my preferred sites)
What I need to know is: IF I disable the EGR via chip modification (It's not a proble for me) no more exh. gasses will goes in to intake again?
I'm asking this because I don't want the opposite scenario:
If the valve is stuck OPEN, disbling EGR (via chip) I have always EGR ricirculation..
-Thanks-

conv90

Thanks
Are you sure that this switch is present also on 90 cars?
I checked Ecklers and this is for 86-89 cars...
http://www.ecklers.com/product.asp?p...NBRK1RX5DEF7G0
-Beppe-

onedef92

What about LT1 engines? Where's the switch located at on those?

Pete K

Good point guys. I assumed they all were like my 87. Aparantly I am wrong. I know certain years f-bodys have the swich screwed into the base of the egr valve. Check this and your service manual. Sorry for the bad info. Pete

h rocks

On yours...there isn't one. My guess is that you drove the car differently the week that you didn't have a code. No light throttle cruise for "X" minutes. Before I went to the Superram I had egr issues. I have a block off plate, and I have not gotten a code. You can remove all of the egr, and smog pump related components, clean up your engine compartment, and disable the egr function on the chip.

Dale1990

When I switched to LT headers, I always threw an EGR code also. I disabled the EGR diagnostic in the chip and there have been no more codes. This does not disable the EGR itself but masks the error code.

Dale

white90conv

I don't think there is a diagnostic switch on the '90. The computer tests the system some other way. When I had a bad EGR, the light wouldn't come on until I had been cruising on the freeway for 10 minutes or so. So you won't always see the light.

conv90

Disabling the EGR via chip modification for me means:
Flags:
-Remove the flag on the Error code mask relate to 24 to 34 errors.
in this case I will remove the falg from the 32 only.
The effect on this will be that NO MORE 32 CODE wil be displayed.
The problem with the EGR exists, but you wiil be not have the warning on your SES light.

Constants:
EGR diagnostic min. veihicle speed. Stock speed is 30 mph
I put it 255 mph
Egr Enable min. MAT temp. stock is -17.50 (Deg. C) It will be 151.25.
EGR % TPS Enable Threshold decreased to 0% (from 3.91% )
EGR % TPS Disable Threshold decreased to 0% (from 3.13% )
Tables:
EGR % Duty Cycle vs. RPM vs. MAP table decreased to 0% across the board.
EGR Duty Cycle Multiplier vs. temp decreased to 0 across the board.

The very funny(?) thing is that I have ready to install a Hooker 2149 LT headers kit (the one with smog stuffs...) and I'm near to disable EGR and Air pump....
-Beppe-