egr restrictor plate
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egr restrictor plate
I have the same problem on my 93 six that everyone else has. I have unhooked and plugged the egr, and it has fixed the surging and hesitation problem. For the restrictor plate, do I drill one 1/8 hole or two? Which passage am I doing this for, top or bottom?
Thanks for the help.
Thanks for the help.
New User
Joined: Jun 2002
Posts: 23
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From: Coeur d'Alene USA
egr restrictor plate
You only need one hole in the restrictor plate because
the other hole is blocked off and not functional. Drill
the hole in the side that the exhaust gases flow through
and install with two new gaskets, one on each side of the
plate. You will be pleasantly suprised at how much better
your engine performs.
91 f150 4x4
300 six w/5speed
the other hole is blocked off and not functional. Drill
the hole in the side that the exhaust gases flow through
and install with two new gaskets, one on each side of the
plate. You will be pleasantly suprised at how much better
your engine performs.
91 f150 4x4
300 six w/5speed
Freshman User
Joined: Mar 2002
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egr restrictor plate
I have an 87 4.9L, no check engine light on the panel. I made my restricter plate with out the 1/8" hole so the EGR is just blanked off. The engine runs very smooth without hesitation in any range of RPM and the fuel mileage improved slightly.
Posting Guru
Joined: Dec 2001
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From: Southeast FLA
egr restrictor plate
I just put two 1/8" holes so I wouldn't have to worry about aligning it up.
But I have to admit I think I should have just gone ahead and blocked it off totally - or at least tried it that way.
Nonetheless, I don't like wht90lx's lack of a description of symptoms, and his lack of specs on his truck, when asking about a 'fix' that might not apply to his truck. Everyone else does not have the problem, and it doesn't seem that all '93's have it based on the reports here (or at least not to me - I guess we haven't done a 1993 inline-six poll though). But, wht90lx, it's your truck, and if you want to go playing around with it then go right ahead.
But I have to admit I think I should have just gone ahead and blocked it off totally - or at least tried it that way.
Nonetheless, I don't like wht90lx's lack of a description of symptoms, and his lack of specs on his truck, when asking about a 'fix' that might not apply to his truck. Everyone else does not have the problem, and it doesn't seem that all '93's have it based on the reports here (or at least not to me - I guess we haven't done a 1993 inline-six poll though). But, wht90lx, it's your truck, and if you want to go playing around with it then go right ahead.
Cross-Country
Joined: Oct 2002
Posts: 98
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From: North Dakota
egr restrictor plate
I have a 1991 F-150 300 I-6 5 speed that was having the very same issue described here in this thread. I have been trying to figure this out off and on for at least two years. I had it to two mechanics who mostly just cost me a couple hundred dollars and never really fixed anything. I put the plate in and bolted it down, and drove the pickup.......I would have sworn to god that this wasn't the same pickup I had yesterday. Not a once did it buck, surge, jerk, hesitate, or however you want to describe the symptoms. I'll check back in a week and let you know how it holds up. I would like to know why this works. Anyone here is free to tell me. Thanks all. Feedguy.
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From: Wichita USA
egr restrictor plate
Well very basically the EGR valve is a calibrated vacuum leak. The amount it is allowed to leak is determined by the EEC programing. As the engine wears through normal use on this application it is unable to compensate. The restrictor plate cuts off most of the flow which gets rid of the lean misfire you were experiencing. It still allows the EGR to function so no CEL problems. As I undersand it.
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New User
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egr restrictor plate
I had the same problem with my 92 auto. Did the plate and it's a new truck. Also picked up about 2 mpg. I chased my tail on that for 1 year, new EGR, position sensor and vacuum solenoid, plus the tuneup stuff, TPS. Should have done the plate first.
BTW, it's the top hole.
Dave
>I have the same problem on my 93 six that everyone else has.
> I have unhooked and plugged the egr, and it has fixed the
>surging and hesitation problem. For the restrictor plate,
>do I drill one 1/8 hole or two? Which passage am I doing
>this for, top or bottom?
>
>Thanks for the help.
BTW, it's the top hole.
Dave
>I have the same problem on my 93 six that everyone else has.
> I have unhooked and plugged the egr, and it has fixed the
>surging and hesitation problem. For the restrictor plate,
>do I drill one 1/8 hole or two? Which passage am I doing
>this for, top or bottom?
>
>Thanks for the help.
Posting Guru
Joined: Dec 2001
Posts: 2,017
Likes: 2
From: Southeast FLA
egr restrictor plate
I dunno, but remember the plate should be completely vacuum/pressure tight. I used two new EGR gaskets (one on either side) and completely coated both gaskets with a gasket sealer.
Did your symptoms change at all when you did your block-off plate? What were they to begin with?
Did your symptoms change at all when you did your block-off plate? What were they to begin with?
It's one week later. I've driven about 100 miles, just to and from work. Not a single symptom. Pickup is cured. Thanks to this forum. I'll keep you on my favorites list! 
New User
Joined: Oct 2002
Posts: 18
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From: Colora U.S.A.
egr restrictor plate
Disconnected the vacuum from the EGR for two days commuting (approx 200 mi) then, this weekend, built and installed the restrictor plate along with a new fuel filter. What a difference 
. Runs great (after I manage to get it started and it is warmed up) and I have no more problems pulling hills or stumbling or acceleration dying off. Pulls strong all the way to 4000 rpm (I haven't pushed it any past that). A big to whomever stumbled across this fix and chose to share it with the rest of us.
George
87 F150, 4.9L, Tremec 4 spd Manual 163,000 miles and counting.
. Runs great (after I manage to get it started and it is warmed up) and I have no more problems pulling hills or stumbling or acceleration dying off. Pulls strong all the way to 4000 rpm (I haven't pushed it any past that). A big to whomever stumbled across this fix and chose to share it with the rest of us.George
87 F150, 4.9L, Tremec 4 spd Manual 163,000 miles and counting.
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49l, 73, block, egr, f150, fix, idi, inline, instructions, lean, misfire, plate, restricter, restrictor, symptoms
