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Discussion Starter · #1 ·
I have a question regarding the EGR valve on my 1994 Ford FI 460 V8 F53 chassis RV. I may want to completely disable the EGR valve. From what I can see, simply plugging the EGR pipe port in my exhaust header with a like-sized plug fitting and leaving the EGR valve attached to the side of the throttle body with the vacuum lines disconnected and plugged should be all I need to do. FWIW the EGR valve doesn’t leak and I can’t find anything wrong with the valve itself (but then that’s not my question here). Is there anything I’m forgetting when I disable the EGR valve?

Thanks for any and all insight regarding this matter.

Steve
 

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I have a question regarding the EGR valve on my 1994 Ford FI 460 V8 F53 chassis RV. I may want to completely disable the EGR valve. From what I can see, simply plugging the EGR pipe port in my exhaust header with a like-sized plug fitting and leaving the EGR valve attached to the side of the throttle body with the vacuum lines disconnected and plugged should be all I need to do. FWIW the EGR valve doesn’t leak and I can’t find anything wrong with the valve itself (but then that’s not my question here). Is there anything I’m forgetting when I disable the EGR valve?

Thanks for any and all insight regarding this matter.

Steve

The additional part throttle timing added during EGR operation at cruise can cause pinging if the EGR is disabled.




S
 

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Discussion Starter · #5 ·
Thank you all for your input. I do have one question left though. What does WOT mean?

Steve

BTW the reason I'm contemplating dumping the EGR valve is that I have an intermittent stalling problem. The last time it happened was on a long downgrade with a stop light at the bottom. Never a good time to lose your power brakes on your 33' Class A RV because of engine stalling. So far I've replaced the idle air control (IAC) valve, the throttle position sensor, the EGR valve position (EVP) sensor, the EGR valve control solenoid, as well as cleaning and servicing the EGR valve itself while checking for leaks in the valve as well as vacuum leaks in the valve and the system. Though I'm certain not everything needed to be replaced, these FI parts are all 21 years old and spent 16 of those years in the rust belt so I don’t feel terrible about replacing them. However, even though the engine runs good and hasn't stalled in a while I'm still get a 334 error message (EGR closed valve high voltage) on my Scangauge. I don't need a repeat downhill engine stall so that's why I'm thinking of dumping the EGR valve.
 

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Thank you all for your input. I do have one question left though. What does WOT mean?

Steve

BTW the reason I'm contemplating dumping the EGR valve is that I have an intermittent stalling problem. The last time it happened was on a long downgrade with a stop light at the bottom. Never a good time to lose your power brakes on your 33' Class A RV because of engine stalling. So far I've replaced the idle air control (IAC) valve, the throttle position sensor, the EGR valve position (EVP) sensor, the EGR valve control solenoid, as well as cleaning and servicing the EGR valve itself while checking for leaks in the valve as well as vacuum leaks in the valve and the system. Though I'm certain not everything needed to be replaced, these FI parts are all 21 years old and spent 16 of those years in the rust belt so I don’t feel terrible about replacing them. However, even though the engine runs good and hasn't stalled in a while I'm still get a 334 error message (EGR closed valve high voltage) on my Scangauge. I don't need a repeat downhill engine stall so that's why I'm thinking of dumping the EGR valve.
Hi Steve ,
I just had my 1997 460 f53 Damon in the shop and it is doing the same issue. I am taking it back in for reason. Did you solve it ?
 

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If you simply unplug the EGR vac hose you will suffer a cel with no driveability issues.
If you block exhaust gas flow but have the EGR valve functional along with the position sensor you can end up with part throttle rattle. The position sensor alerts the ECM to add additional timing for EGR flow.

This is why a plugged EGR passage / valve can cause ping at part throttle.

My very late 1997 F250 OBS 2wd SB runs better with the vac hose disconnected.
Throttle response is better as is throttled torque.
I've checked fuel economy both ways and the difference is .5 mpg.

Banks cat back
Banks filter lid and filter with no silencers.
15* BTDC no spout. I DO NOT tow or haul heavy loads.
180*f high flow stat.

As I've gone through these mods fuel economy has increased about 10%

Headers go on when I build one of my stroker EFI combos for my own truck lol.











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