307 EGR delete?

[techg8]

Is it advisable to delete the EGR setup on a CCC 1986 307?

I assume it would kick a code without the components but other than that is there a downside?

The EGR valve and EGR solenoid are FUBAR on my 86 307. The solenoid looks pricey to replace

 

[DoubleV]

It would NOT be wise to delete your EGR on a CCC engine. It won't throw a code if you did but you would most likely get part throttle pinging. Get a new solenoid from the boneyard.

On another note, I don't know how well a swirl port 'HO' 307 will run on the non-swirl port ECM of your 83, but it won't be optimal. If you then use the matching ECM from a 86/87 HO engine, I'm not sure your 83 CCC wiring harness will match up to it exactly ( EGR and RVB stuff is different, maybe others ). You could of course just use a CCC wiring harness that matches the 86/87 ECM.

 

[olds307 and 403]

I believe the earlier computers have a less timing built in. I have a vin y computer out of my 88 CSC, you can have it for shipping.

 

[techg8]

On another note, I don't know how well a swirl port 'HO' 307 will run on the non-swirl port ECM of your 83, but it won't be optimal. If you then use the matching ECM from a 86/87 HO engine, I'm not sure your 83 CCC wiring harness will match up to it exactly ( EGR and RVB stuff is different, maybe others ). You could of course just use a CCC wiring harness that matches the 86/87 ECM.

I got the wiring harness for the 307 with the 307 but the ECM connectors were cut.

I am planning on sourcing a ECM for the 307. The 6cyl ecm and harness I have in a box on the shelf.

I also have a complete setup - ecm, harness etc from an 86GP but it looks a bit different - I think from a 305

I willprobably find some spare connectors somewhere and fix the correct harness that came with the 307.

 

[olds307 and 403]

On my non CCC 307's, no problem without EGR. Is the later ECM different between Y and 9?

 

[DoubleV]

On my non CCC 307's, no problem without EGR.

Maybe you're just lucky? Maybe you're getting a little bit of silent detonation and don't even know it? Maybe you keep the cylinder temps down because you're running too rich? Maybe you just have a better engine than others ( they're all mass produced after all ). Could be lots of things really, I don't know, but I still say it is unwise ( not impossible, just unwise ) to delete the EGR on CCC engine, especially a swirl port one. There's nothing to gain from it's removal anyway so what's the point anyway? Why take the chance?

Is the later ECM different between Y and 9?

Yeah I'm pretty sure there are differences but I would guess the differences would be minimal. I know the later swirl port ECM's provide ALOT of part throttle timing advance though and use leaner carbs. Take away the EGR and you could be rattling your engine to pieces without even knowing it.

 

[techg8]

From a hows-it-work point of view,

It looks like the 1986 Solenoid assembly houses three vacuum solenoids -
idle load compensator
rear vacuum break (carb)
EGR Gas recirc

The ECM provides the ground for each of these according to its programming.

The only one I care about is the rear vacuum break because it has to do with the choke operation.
I do have a single solenoid from the former V6 setup so maybe I will just hook that one up.

Or Ill see if I can find a used 86 solenoid assembly and hook it all up right to avoid the detonation possibility. This route would likely give the best results, or at least be "correct" for the engine

Thanks for the input guys.

 

[techg8]

I just found the Solenoid Assembly in the garage on top of a Buick 430 I have on a stand. I must have thrown it there on disassembly.

So now Ive got it , I guess I will put the EGR in place.

 

[olds307 and 403]

I agree on the EGR is needed with the CCC. I personally would consider using the earlier ECM, supposedly over 60 degrees timing in the swirl port one! Then again, I would have milled those heads to hit 9 to 1. I may have had mild unnoticeable pinging on my 307's, didn't do any damage, many trouble free miles. My 307's never ran hot, unless water pumps or rads went south.

 

[DoubleV]

The only one I care about is the rear vacuum break because it has to do with the choke operation.
I

The RVB operation is totally useless I assure you. You don't need it at all. The front vacuum break ( choke pulloff ) is the one you need. All the rear one does is open the choke sleightly more after about 30 seconds or so after a cold start so your engine doesn't run as rich for like a few seconds before the choke opens up all the way . Totally useless! It was there for one reason and one reason only; to get the engine to pass one of the cold start emission requirements of the day. Did I mention it's useless? :wink:

So run the EGR and ditch the RVB and ILC.

Go to the boneyard and get the EGR/RVB/ILC solenoid from any old 307 equipped car. Probably some B body cars to choose from. You can then get the mounting bracket for it too.