EGR removal & check engine light

g0thiac

Master Mechanic
Sep 6, 2020
303
43
So now that my Caprice passed inspection, I was wondering how to go about the EGR removal.

As of right now, I’ve taken the vacuum line out, plugged the hose going to the carburetor, and the ones leaving the t stat housing, and unplugged the sensor.

Is a block off plate all I need now? And also, guessing it’s needing a code reader to reset the ECM and get rid of the light? Thanks.
 

g0thiac

Master Mechanic
Thread starter
Sep 6, 2020
303
43
So reading the codes, it seems to be 15 for the error here. Or the coolant temp sensor more specifically.

Is there a resistor I can wire in the connector to make the ECM turn off the light? Just thinking that's all.

1620438686700.png
 

MrSony

Geezer
Nov 15, 2014
6,127
113
Des Moines, Iowa
on something that is bone stock removing egr isn't really necessary unless it's broken. it doesnt rob power or harm anything.

Code 15 is for low temp, wire could be broken or have a bad ground possibly.
 
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Clone TIE Pilot

Comic Book Super Hero
Aug 14, 2011
2,625
113
Galaxy far far away
Only thing I can think of is if your Caprice uses CCC, you can install a ZZ4 performance PROM chip to delete EGR. But you will also need a 87 or 88 L69 ECM.
 
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g0thiac

Master Mechanic
Thread starter
Sep 6, 2020
303
43
on something that is bone stock removing egr isn't really necessary unless it's broken. it doesnt rob power or harm anything.

Code 15 is for low temp, wire could be broken or have a bad ground possibly.
It's not completely broken, but it is the original unit and I'd imagine is definitely covered with carbon deposits.

And for sure, I unplugged it because I plan to replace the housing, since a new one with the EGR plugs and temp sensor is more expensive than the other standard AC Delco one with the two holes that are filled by two brass plugs.
 

Kra5379

Apprentice
Apr 30, 2019
63
18
So reading the codes, it seems to be 15 for the error here. Or the coolant temp sensor more specifically.

Is there a resistor I can wire in the connector to make the ECM turn off the light? Just thinking that's all.

View attachment 174909
So reading the codes, it seems to be 15 for the error here. Or the coolant temp sensor more specifically.

Is there a resistor I can wire in the connector to make the ECM turn off the light? Just thinking that's all.

View attachment 174909
Code 15 is Temperature circuit is open (the engine must run for 5 minutes under 800 RPM to set this code) and it’s usually related to a code 14 which indicates a shorted coolant sensor. Check your wiring to the coolant sensor for breaks, insulation chafing, corrosion in the plug if everything is good replace the sensor. The coolant sensor is one of the most important inputs for the ECM, it uses it to calculate and adjust air/fuel mixture, timing adjustments etc. I wouldn’t recommend trying to bypass it if you plan on continuing to run an ECM controlled engine
 

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