EGR bleed solenoid

My 1982 chevy k10, 305 v8, has a broken EGR bleed solenoid, P/N "1997532". I can not find a replacement.

I assume when power is applied to this component it allows the carbuertor vacuum to operate the EGR valve. So if this isn't installed will the EGR function?

I also read about two different types of EGR, positive or negative pressure configurations. Do both styles require this solenoid?

Is it possible to some how bypass this solenoid?

I am worried this old truck won't pass my city required emissions testing if I start removing the emissions control stuff.

Any suggestions?

On my truck, the former owner had removed the EGR valve and put on a block off plate. All the vac lines were removed and thrown away. These motors stock especially in later years will often ping quite a bit without the EGR valve. So I had the same problem as you. I'm honestly not sure why there is a bleed solenoid or when it actuates, but what I ended up doing was I just went without the solenoid, and since my TVS was gone to I went without that as well. I simply ran the vacuum line from the EGR valve to a ported vacuum source on the carburetor. That's how it was done on older engines anyway. The TVS keeps the EGR from opening before the engine is warmed up. Ported vacuum will keep the EGR closed at idle, wide open at cruise and then close up as the throttle is opened.

Basically what I'm saying is you can have a functional EGR valve even without those pieces, it may not operate exactly as GM intended, but it will certainly be better than no EGR at all.

Does anyone know where you can buy a new one? Currently rebuilding my 82 C10 and staying stock with everything. Any help would be appreciated

bwolff0820 said:

Does anyone know where you can buy a new one? Currently rebuilding my 82 C10 and staying stock with everything. Any help would be appreciated

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As far as I know they are no longer made. So your options are a wrecking yard, E-bay or doing without one. An EGR does not have to have the bleed valve to function. GM obviously wanted it to be there and it would be best if it was, but you can get by just doing away with the bleed valve and connecting the EGR to a ported vacuum source.

That’s what I was thinking after searching the internet and could find one. I’ll check some local junkyards and se if they have one and if not I’ll just bypass it. Thanks for the help

bwolff0820 said:

That’s what I was thinking after searching the internet and could find one. I’ll check some local junkyards and se if they have one and if not I’ll just bypass it. Thanks for the help

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I am really a big fan of running factory equipment on a stock motor, but in some cases its just not possible. It'll work fine for you even if you end up bypassing it.

I agree. The truck I’m starting to rebuild sat for about 15 years and I’m trying to get everything out back to stock so I can have a good starting point to see what all needs to be done to it. Unfortunately I know a lot of parts are no longer manufactured especially some of the emission parts.

Look on amazon. Thought I posted this at the start of this thread,I guess I didn't push the save button They have them on Amazon. If you can't find yours 1 for a 4.9 cadillac will work if you change pitails.

Ricko1966 said:

Look on amazon. Thought I posted this at the start of this thread,I guess I didn't push the save button They have them on Amazon. If you can't find yours 1 for a 4.9 cadillac will work if you change pitails.

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I saw that the other day but didn't suggest because of the different pigtail, but yea changing that out could be a good idea.

Okay @SirRobyn0 I just read your earlier post,where you stated you didn't know the purpose of the egr bleed solenoid. The purpose of the egr bleed solenoid is it is pulse width modulated so there is a duty cycle,like an injector to control the amount of time the egr valve has vacuum. The egr valve side has a slow bleed to atmosphere so the egr can close when the engine vacuum is gone. This way they can control how far the valve is open by varying on off time on the solenoid. Me personally would like for it to work correctly but would run with the solenoid bypassed before I'd run without egr. Just an FYI for anyone that wants to know.

We used to add vacuum restrictors when vehicles had an EGR induced drivability issue. Too much EGR flow. They would still pass emissions test with them. It took 2-3 in series. Just a suggestion if bypassing the bleed creates a problem.

One source probably not the cheapest.

Ricko1966 said:

Okay @SirRobyn0 I just read your earlier post,where you stated you didn't know the purpose of the egr bleed solenoid. The purpose of the egr bleed solenoid is it is pulse width modulated so there is a duty cycle,like an injector to control the amount of time the egr valve has vacuum. The egr valve side has a slow bleed to atmosphere so the egr can close when the engine vacuum is gone. This way they can control how far the valve is open by varying on off time on the solenoid. Me personally would like for it to work correctly but would run with the solenoid bypassed before I'd run without egr. Just an FYI for anyone that wants to know.

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I remember that now that you say it, which I think is why running it to a ported vacuum source "close enough" even though it's not the same.

@fast 99 those are just a restrictor, correct? My thinking is if your going to restrict vacuum as a delay,which is a freaking great idea, I would think a brass aquarium pump valve would be a easy one shot deal,you need less restriction,twist it out,more restriction,twist it in.

Yes, it slows down the opening of the valve. Valve still works and opens just as far, only slower. We were getting high numbers of off idle and mid-range drivability complaints. It was a tool in the box to sneak one by the inspectors, still meet tailpipe emissions limits and pass under hood inspections. Like I said earlier it takes 2-3 to have a noticeable effect, more the better.

I understood it was a restrictor and understood it would delay opening what I was saying is I think just 1 aquarium valve would give a person any amount of restriction they needed.