90 HF throwing code 12 EGR checked out now what ???????????
90 HF throwing code 12 EGR checked out now what ???????????
ok well the other day my check engine light goes on so i get the code 12 EGR. So i asked around and people told me to check the valve to see if it holds vaccuum and it does. Then they also tried telling me to clean it with a wire brush cause it might be clogged so i did that . After all that i reset the ECU and then the next night it goes on again for the same code. what else should i do or look at ? please help
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Re: 90 HF throwing code 12 EGR checked out now what ??????????? (DeDonDeRosa)
EGR code only comes on if the lift sensor doesn't work or if it doesn't detect lift.
There is a rod connected to a rubber diaphram inside the EGr. When the intake manifold creates vacuum, it pulls the diaphram and the rod lifts. The lift sensor detects that movement.
Cleaning the EGR won't do a damn thing for this.
When you checked to see if it held vacuum, did it hold it completely or did it bleed off slowly? It's supposed to NOT bleed off.
Anyway, i have an EGR for sale if you want to try another. Maybe your lift sensor on the top of the EGR is dead.
PM me if you want it.
There is a rod connected to a rubber diaphram inside the EGr. When the intake manifold creates vacuum, it pulls the diaphram and the rod lifts. The lift sensor detects that movement.
Cleaning the EGR won't do a damn thing for this.
When you checked to see if it held vacuum, did it hold it completely or did it bleed off slowly? It's supposed to NOT bleed off.
Anyway, i have an EGR for sale if you want to try another. Maybe your lift sensor on the top of the EGR is dead.
PM me if you want it.
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