EGR to EVP

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Dec 21, 2015 | 02:29 PM

4.9LOldFordTruck

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EGR to EVP

I pulled codes and got code 33 on KOER. I found my EGR and there was no hose on it at all. Ok I bought a hose that fits it right but my question is. The vacuum routing shows the EGR connects to the EVP. On the diagram it shows the EVP near the front of the truck. I looked and all I see is a vacuum hose going to a vacuum reservoir. Is that where I could connect the hose to? Or where would the EVP might be? Truck is a 1990 4.9L F150

Dec 21, 2015 | 02:38 PM

rla2005

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From: Kentucky

The EVP (EGR Valve Position) sensor sits on top of the EGR valve. Like the gray sensot on top of the EGR in the photo below.

The EVR (EGR Valve Regulator) is controlled by the computer to open the EGR under certain conditions.

Typical EVR:

One side of the EVR has manifold vacuum. The other is the small amount of vacuum allowed through to open the EGR valve.

Some good reading here:

EVR

EVP

Dec 21, 2015 | 02:50 PM

4.9LOldFordTruck

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So if the sensor is on top which I did go and see. Yet the routing shows the egr connected to something in the front. I would take a picture of the diagram but my phone doesnt have auto focus which sucks.

Dec 21, 2015 | 03:22 PM

rla2005

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The vacuum routing can be a bit deceiving, but I can guarantee you there is no vacuum connection on the EVP sensor, it's electrical.

Not sure where the EVR is located on a 4.9L engine. I'm a gas V8 guy.

Dec 21, 2015 | 03:54 PM

Redneckfordf2502002

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From: Backwoods of Snowflake AZ

EVR is on the bracket for the igniton coil on my 92 I6 just like my 88 308.
You probably are thinking of your vacuum canister (coffee can) If I remember correctly their is a line from your intake manifold to the EVR you will have to find out weather it is the top or bottom line as it is hard for me right now to check on my trucks. From the other line on the EVR it goes to the egr valve.
Trav

Dec 21, 2015 | 04:22 PM

rla2005

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From: Kentucky

Quote:

Originally Posted by Redneckfordf2502002

If I remember correctly their is a line from your intake manifold to the EVR you will have to find out whether it is the top or bottom line as it is hard for me right now to check on my trucks. From the other line on the EVR it goes to the egr valve.
Trav

The bottom port is the manifold source vacuum port:

Thanks Trav for the EVR location.

Dec 22, 2015 | 02:25 PM

4.9LOldFordTruck

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I found a green wire hanging near my EVP. I pulled it up to see it and their was a small screw in it. Took it out put it back on the EGR and retested it. Still got code 33. The hoses are connected to the ports. The only hose I cant check is the one that goes to source vacuum. On my diagram it goes behind the engine and to a reservoir on the other side.