My truck is a 2000 Chevy Silverado with the 4.8L dbc manual trans I bought a gen 3 5.3 from a 2003 suburban not knowing it was dbw. Will the 2003 engine bolt in and have all same electrical and run if I just put my 4.8 dbc throttle body on it???

 

yeah it'll be fine, just use the intake manifold and harness from the 4.8.

 

okay so no extra harness needed? And the 2000 manifold will bolt onto the 03?

 

Pull the Intake and put them two Engines side by side, they will literally be identical. Could use any of them Intake Manifolds just bolt up your Cable Throttle Body.

 

You'll definitely have to swap the intake. I tried just swapping throttle bodies once and it didn't work.

 

Ummm not with a 2000 and a 2003, literally the same manifold. Gen III.

You probably tried to go Gen III to Gen IV which is 3 bolt or 4 bolt, lets share all the details here.

 

The intake manifold will be different, so use the 2000 model for the DBC set up. Also the oil pressure senor is different so you will need to swap that as well.

Since you have a 2000 with manual trans 4.8, when you remove the fly wheel assembly look at the back of the crankshaft. If it extends past the rear main seal area by around 1/2 inch or more you will need a special spacer and longer bolts to take up the additional length from the original crank.

Also being a 2000 model, you would likely have an EGR Provision for sure on the passenger side and possibly Air injection if it was a 50 state emissions truck. Use which ever exhaust manifolds you need to be compliant in your area.

Things you will definitely want to consider doing while the engine is out. New Rear main seal, Pull the oil pan and change the O-ring on the oil pump pick up tube and a new pan gasket, New exhaust manifold bolts. The front crank seal can be done in the Vehicle, but it's easier to do while it's out.

 

typically the 2000 years had EGR and the 2003 didnt, so the egr port on the 2003 will be blocked.

other than that, should be pretty similar. i'd just use the 2000 intake manifold as it is personally.

 

Fun fact for you both:

4.8l didn't have EGR.

 

nice, never had one. had a few 5.3s of both vintages though.

 

Fun Fact For Everyone. Your wrong!

The 1500 series all had EGR from 99-01 But not all had Air Injection.

EGR was on both 49 federal and 50 State California Compliant trucks
AIR Injection was Only on 50 State California Compliant trucks.

In 2002 on the 1500 series trucks, seem to have gone away from the EGR and air injection just prior to going with the 1 MB PCM in 2003.

 

Considering I've never seen a 4.8l with EGR on it I find it hard to believe every one of them 4.8l 1500 Trucks was 2002 only.. put a Supercharger on a 2000 model that was factory stock, didn't have it.

It is what it is.

 

Not saying they couldn't have them for certain regions or something but my buddy had an early 2000 with a 4.8L that had an EGR and he purchased it from Alabama area. It did not have Air injection.

I have always seen an EGR but not always AIR Injection. Based on what I was able to find when I had my 2000 this is what I came to understand. At that time they didn't have standardized 50 state emissions vehicles. The federal vehicles were cheaper to produce because they didn't have the extra equipment. But as other states jumped on the CA emissions the feds mandated they all be the same.

Here is a 2001 with a 4.8 in Michigan with the attached emessions label.

 

I've never seen a truck with the AIR System on it. Stationed in Arkansas was there for 14 years and moved to the Panhandle of Florida. Maybe the region.

 

AIR Injection was a California thing. It's really dumb. It works only on cold start and runs for 200 some odd seconds. There is a remote mount pump mounted in the second battery area on the passenger side. It injects air into the exhaust stream to help light of the Catalytic converters faster.

I will see If I have a picture on my old laptop. It has two 1 way diaphragm valves, One on each side to prevent the exhaust from coming back up through the system and leaking to atmosphere. Again something that could be fixed with better tuning.

 

My old 2000 Silverado 1500 with 5.3L had EGR and Air Injection. I guess its actually called Secondary Air injection.

Look on the Right passenger fender towards the rear and you will see the pump. There is an approximately 1 inch diameter hose coming off that the goes to each manifold. The portion that bolts to the manifold is Stainless there is also a metal portion that goes up and around the back of the intake manifold. At each junction there is Secondary Air Injection Check Valve.

 

Here is a parts break down of the system.

 

I know what it is because I took it off of my Z06 when I put the TSP Stainless Headers on. Took all of it off and it's in a box here. Tuned it out and removed all of it off the car. It was a 30 sec pulse of air into the Cat frum my understanding.

 

Look at your OEM tune then. On the trucks it's 210 seconds on time.

 

Using HP Tuners it just gives me the ECT to enable/disable it at. Can't see anything else.

Well, nice to know what that little tray in the passengers side corner Engine Bay of my 2001 2500HD was for, the connector is there just hanging always wondered what went there. AC stuff is plugged in as it should be.