Should I add an EGR? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

83 Scottsdale · 10-23-2015, 05:51 PM

I have a 1983 K10. The original engine was a 305 but it was swapped to a crate 350 before I bought it. I was diagnosing a problem my truck had, and I read somewhere that the EGR could be plugged which was causing the problem. So I looked at my engine and I found that I don't have an EGR. There is a plate bolted on where the EGR should be and the manifold vacuum line is plugged off. So I'm thinking that when they swapped engines, they didn't put the EGR on. I did more research on EGR's and apparently they add 1-2 mpg. My question is if I should buy and EGR and install it, or just leave it? I think they run about $50-70 so would it be worth it or not? Also, would it mess with my timing? Any help is appreciated!!!

Thanks.

68c10owner · 10-23-2015, 06:07 PM

I took mine off and the truck runs better. Cant comment on the mileage but if you do add it you will need more than just the EGR valve. You will need the EGR solenoid and the valve that goes into the air cleaner. If you dont need to smog your truck leave it off.

83 Scottsdale · 10-23-2015, 06:19 PM

Quote:

Originally Posted by 68c10owner

I took mine off and the truck runs better. Cant comment on the mileage but if you do add it you will need more than just the EGR valve. You will need the EGR solenoid and the valve that goes into the air cleaner. If you dont need to smog your truck leave it off.

Ok, thanks. I'm going to assume that my truck doesn't already have those either. I cant find any pictures or diagrams of it for my truck, so I don't know where everything plugs in at. Do you have any pictures of yours or know where I could find one?

Thanks.

Dead Parrot · 10-24-2015, 05:10 PM

It may have had one originally. But since the motor was swapped and it sounds like the PO removed most of the emissions, probably best to proceed as though it won't have emissions. Adding them back piecemeal is a good way to add to your frustration level.

What's the problem you are trying to fix?

Tom · 10-25-2015, 06:47 PM

Who said EGR adds mileage? Think of it this way: how does adding spent exhaust with no energy to put into the combustion cycle for motivating the truck down the road add mileage? Its purely for emmisions.
EGR, or the lack of, is not causing your problems.

83 Scottsdale · 10-27-2015, 12:32 AM

Well, my problem has been dubbed "the morning miss". Early in the morning when I first drive it, I go up this small hill at low rpms and the engine will miss. I've read that it could be the timing, it could be moisture in the distributer, it could be a pinhole in a spark plug wire, or it could be the EGR crapping out. That's what got me looking into the EGR stuff. It seemed to be the most common problem. I don't know what the issue on my truck is but I find that if I just warm up the engine a bit longer then it doesn't happen. So I'll just stick with warming up my engine until I can figure it out for sure. And to the one saying it doesn't increase mph, I read that because it recirculates the exhaust, your engine uses less fuel, and the oxygen percentage is lower. This all causes the timing to be a bit more efficient. That's why I wanted to add a EGR. I read stories where people bought an EGR delete kit and their milage went down. I guess it just depends on the vehicle it's in.
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kody1234 · 10-27-2015, 08:07 AM

it may just need a tune up.

**hatzie** · 10-27-2015, 09:03 AM

Is the EGR valve still on the intake or did the PO install a proper block off plate?

83 Scottsdale · 10-27-2015, 11:10 AM

Quote:

Originally Posted by hatzie

Is the EGR valve still on the intake or did the PO install a proper block off plate?

There is a block off plate where the EGR should be. And I don't see the EGR solinoid. But I do see the vacuum tube from the manifold was just cut and had a screw blocking off the line.
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68c10owner · 10-27-2015, 12:45 PM

My 85 has this same problem. it misfires until it warms up. Probably a EGR solenoid which I believe to be the same issue as mine. I removed my EGR and installed a plate and it runs better but still have that misfire in the morning. After about 30 seconds it goes away. But if your truck doesnt even have a EGR solenoid then I dont see how that can be the problem.

83 Scottsdale · 10-27-2015, 02:32 PM

Quote:

Originally Posted by 68c10owner

My 85 has this same problem. it misfires until it warms up. Probably a EGR solenoid which I believe to be the same issue as mine. I removed my EGR and installed a plate and it runs better but still have that misfire in the morning. After about 30 seconds it goes away. But if your truck doesnt even have a EGR solenoid then I dont see how that can be the problem.

Yeah, I was diagnosing the problem and I went to check my EGR and then realized that I don't have one. So then I was wondering if I should have one or not. So that's why I was asking you guys if I should install one or not. It looks like it will cost too much anyways. Not worth it too install one.
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10-23-2015, 05:51 PM	#1
83 Scottsdale Registered User Join Date: Aug 2014 Location: Wyoming Posts: 35	Should I add an EGR? I have a 1983 K10. The original engine was a 305 but it was swapped to a crate 350 before I bought it. I was diagnosing a problem my truck had, and I read somewhere that the EGR could be plugged which was causing the problem. So I looked at my engine and I found that I don't have an EGR. There is a plate bolted on where the EGR should be and the manifold vacuum line is plugged off. So I'm thinking that when they swapped engines, they didn't put the EGR on. I did more research on EGR's and apparently they add 1-2 mpg. My question is if I should buy and EGR and install it, or just leave it? I think they run about $50-70 so would it be worth it or not? Also, would it mess with my timing? Any help is appreciated!!! Thanks. __________________

10-23-2015, 06:07 PM	#2
68c10owner Registered User Join Date: Oct 2003 Location: Carmichael, California Posts: 3,006	Re: Should I add an EGR? I took mine off and the truck runs better. Cant comment on the mileage but if you do add it you will need more than just the EGR valve. You will need the EGR solenoid and the valve that goes into the air cleaner. If you dont need to smog your truck leave it off. __________________ Anthony

10-24-2015, 05:10 PM	#4
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,490	Re: Should I add an EGR? It may have had one originally. But since the motor was swapped and it sounds like the PO removed most of the emissions, probably best to proceed as though it won't have emissions. Adding them back piecemeal is a good way to add to your frustration level. What's the problem you are trying to fix?

10-25-2015, 06:47 PM	#5
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,698	Re: Should I add an EGR? Who said EGR adds mileage? Think of it this way: how does adding spent exhaust with no energy to put into the combustion cycle for motivating the truck down the road add mileage? Its purely for emmisions. EGR, or the lack of, is not causing your problems. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

10-27-2015, 08:07 AM	#7
kody1234 Registered User Join Date: Jan 2015 Location: durham nc Posts: 13	Re: Should I add an EGR? it may just need a tune up.

10-27-2015, 12:32 AM	#6
83 Scottsdale Registered User Join Date: Aug 2014 Location: Wyoming Posts: 35	Well, my problem has been dubbed "the morning miss". Early in the morning when I first drive it, I go up this small hill at low rpms and the engine will miss. I've read that it could be the timing, it could be moisture in the distributer, it could be a pinhole in a spark plug wire, or it could be the EGR crapping out. That's what got me looking into the EGR stuff. It seemed to be the most common problem. I don't know what the issue on my truck is but I find that if I just warm up the engine a bit longer then it doesn't happen. So I'll just stick with warming up my engine until I can figure it out for sure. And to the one saying it doesn't increase mph, I read that because it recirculates the exhaust, your engine uses less fuel, and the oxygen percentage is lower. This all causes the timing to be a bit more efficient. That's why I wanted to add a EGR. I read stories where people bought an EGR delete kit and their milage went down. I guess it just depends on the vehicle it's in. Posted via Mobile Device

10-27-2015, 09:03 AM	#8
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,916	Re: Should I add an EGR? Is the EGR valve still on the intake or did the PO install a proper block off plate? __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

10-27-2015, 12:45 PM	#10
68c10owner Registered User Join Date: Oct 2003 Location: Carmichael, California Posts: 3,006	Re: Should I add an EGR? My 85 has this same problem. it misfires until it warms up. Probably a EGR solenoid which I believe to be the same issue as mine. I removed my EGR and installed a plate and it runs better but still have that misfire in the morning. After about 30 seconds it goes away. But if your truck doesnt even have a EGR solenoid then I dont see how that can be the problem. __________________ Anthony



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