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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 10-08-2016
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I am: Cheyenne
Join Date: Oct 2016
Location: Listie
Vehicle: 1997 Ranger
Drive Type: 4x4
Engine: 4.0
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Egr delete help

I'm new here and have a few questions. Please forgive my lack of knowledge. I'm looking into buy a 97 ranger with a 4.0 from a friend. He put headers on it and said he did an egr delete but that he needs a computer to turn the egr off before I can drive it. Everything I've read on different forums seems like as long as everything is closed off right it runs fine just throws a CEL? So I looked into to tuners and was wondering if the sct x4 can shut off the egr? I saw it done on a diesel but not sure what the difference would be with this engine. I guess my question is do I need to get a custom tune or can the tuner just turn the egr off? Thanks in advance for any help :)
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Old 10-09-2016
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I am: Ron Dean
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Vehicle: 1994 Ford Ranger
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Welcome to the forum

The EGR(exhaust gas recirculation) system allows for more aggressive spark timing, so certainly doesn't hurt performance, quite the opposite.

NOx is a toxic emission that spikes to very high levels when cylinders heat up too much.
Cylinders heat up when you accelerate or otherwise load up the engine.
Heating up the cylinders also causes pre-ignition(pinging/knocking) with 87-89 octane gasoline.

If you add a bit of exhaust gas to the intake as engine is loaded up it will slow the burn in the cylinders which keeps the heat levels down, so less NOx and no Pinging with regular gas.
Less NOx was the big concern, no pinging was a by product but.......a bonus since the only other way to prevent pinging is to run more expensive higher octane gas or to change the spark timing to ignite the gas before it can pre-ignite, which lowers power and so MPG as well.

Yes, you can program EEC-V computer to ignore EGR system, but you will also have to change spark curve to prevent pinging on Regular gas.

It is easier to add a bung on a header pipe and restore the EGR system if you still have the parts.
Any exhaust shop can add the bung with correct placement and size to match existing EGR tube.
Your lungs will thank you along with any kids or grand kids you may have now or in the future.

Last edited by RonD; 10-09-2016 at 12:04 PM.
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