Hey,


So ive got an 1989 f250 4x4 with the 7.5L efi and i recently put heders in and im having issues with the EGR pipe that threads into the heder and am thinking about just capping it of and being rid of it. i know what its for and passing smog isnt really a priority for me cause im just going ot get classic vehicle plates for it. With that said is there really any negitive effects (legitimately) of getting rid of the EGR (without the usual of not passing smog). only thing ive read is the exhaust temperatures can get hot.

 

This is as common as oil debates.

A functional EGR valve serves its purpose and one important purpose is reducing cylinder head temps. It also helps reduce pollution and the ECM or PCM also uses it to lean out the fuel/air mixture.

Some have seen no Ill effects of eliminating it, others have stated and had issues with engine "Ping".

Others will chime in....

 

Mine has been blocked off on my EFI 4.9 for years with very good results. A 7.5 may or may not react the same.

 

ok, with it helping to run a leaner fuel mixture by reburning the gases, it runs more effecient? ive read about how the engine will ping. cant i just advance the timing a bit to fix that?

 

My EGR valve was stuck closed for a little while and I can say that the fuel economy improved a little bit when I repaired it. How ever I didn't really have any bad side effects that I was aware of other than that blinding check engine light coming on while I was cruising at 75 down the interstate. As far as pinging goes, I live in colorado and run 85 octane fuel, never had a pinging issue with or without the EGR.

 

You would "Retard" the ignition timing if it were to "Ping"

I had to block off the EGR in my '92, 300 simply because I didn't have $160 for Fomoco EGR valve. And lesson learned on part store EGR valves...I'll never buy one of them again. I've had 2 different valves and one stuck, the other would never work correctly, and the 3rd that I replaced years earlier, snapped off in the EGR tube...Fun, fun....

 

Dang that sucks timbersteel! And thanks for the info! I wasnt able to get that EGR pipe mounted onto the hedder so i just capped the hedder and unplugged the EGR. check engine light came on but i didnt hear any pinging and the truck sounds how a big block 460 should sound! took it for a test drive and it drives great!

 

I just put a pair of headers on my 97 7.5l and just capped the EGR off. I haven't noticed anything yet. The check engine light did come on.

 

ya i just capped teh headder witht he plug and i unplugged my egrand my engine light is on as well. to be honest though, my truck's performance doesnt feel any different its just louder haha

 

If you want things to act as normal, like the CEL, just block off the EGRV with a sturdy plate and gaskets, and plug your EGRV back in.

 

Nah im not worried about the cel being on, thanks for the tip though!

 

Well that light just might tell you that there is another issue brewing, just saying..

 

Wise words, right here.

 

You will get more part throttle power with it blocked, the egr turns your 460 into a 414.

The ecm leaning out the mixture is a common misconception. It doesn't lean out the mixture...it reduces fuel to account for the reduction in air associated with the egr cycle. The afr remains the same (although the afr cannot be perfectly calculated with egr, because the exhaust entering the intake has an air:fuel reading [despite being an actual 0:0] of whatever was discharged at the valves opening and not necessarily what is entering the cylinders via injectors and fresh air) but overall "air" is reduced, so the computer adjusts accordingly.

 

yes i know that ive theres other issues i wont know cause the light will always be on but i cna do teh check my self every. so often to make usre its going good. '89F2urd, will it stil be like a 414 with it just unplugged?