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In a diesel it will usually hurt fuel economy.
Only time EGR helps fuel economy for sure is in very cold climates.
Don't have to delete anything, just make a sheet metal gasket with no hole for the exhaust to flow through. It's all there and still "working" as far as the ecu is concerned.
EGR on diesels is known for increasing tail pipe soot, decreasing fuel economy and decreasing horsepower.
With this mod you can try it and if fuel economy goes down you can easily undo it. Also I have heard of 1.9t intake manifolds becoming horribly clogged with diesel soot.
On a gasoline engine the EGR being disabled usually decreases fuel milage. It does not effect peak power because the EGR closes at around 1/2 throttle.
Also does it have a cold air intake or intercooler?
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
Last edited by oil pan 4; 07-22-2022 at 05:23 PM..
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