EGR valve or Control Solenoid Problem

[Rob_0126]

(91 s-10 Blazer, 2dr, 2wd, 122k miles)

Either the EGR valve or the Control Solenoid is acting up. I plugged both, and the feeling of slipping is gone. I checked the egr and the plunger is fine and it holds vacuum. Could the spring be too weak vs the vaccum of the engine now and causing it to open too much?

Or could the solenoid spring/whatever be bad and opening the egr too much?

ATM, would it fool the cpu if I just unplugged the solenoid from the engine vacuum, untill I figured out the part thats the problem? I dont want to buy both because either or is expensive.

thanks

[Sparky2263]

Most likely the valve opening too far. Solenoid failure results in the egr not opening.

[Rob_0126]

Most likely the valve opening too far. Solenoid failure results in the egr not opening.

welp, guess immah have to buy an egr valve then. So you think the egr spring is weak?

Hey, you said buy oem; I noticed napa sells actual oem replacements. Is that what you meant?

I tried to fool the ECM but no matter what I did (plugged solenoid, cut off vacuum to solenoid, kept vaccum to solenoid and unplugged egr hose), it always sets the check engine lite. Is there another sensor that tells it the solenoid isn't actuating the egr?

[Sparky2263]

Nope. OEM as in an AC/Delco box. Find a wholesaler near you or go to gmpartsdirect.com

[Rob_0126]

Nope. OEM as in an AC/Delco box. Find a wholesaler near you or go to gmpartsdirect.com

Whats difference in one of those and say an echlin?

How much does an ac delco one cost?

[DetroitMuscle]

Whats difference in one of those and say an echlin?

How much does an ac delco one cost?

50 bucks.

[Rob_0126]

50 bucks.

What about quality of parts and so on and so forth.


Someone mentioned on here that the ac delco one was superior to an aftermarket one. Well, If the echlin would be just as good, id rather pay $55 for the echlin, than $80+ for an ac delco. I like acdelco stuff but the egr valve isn't my top priority if it will work fine and stop the slipping feeling.

Matter fact, ac delco oil filters is the only one I trust.

[DetroitMuscle]

What about quality of parts and so on and so forth.


Someone mentioned on here that the ac delco one was superior to an aftermarket one. Well, If the echlin would be just as good, id rather pay $55 for the echlin, than $80+ for an ac delco. I like acdelco stuff but the egr valve isn't my top priority if it will work fine and stop the slipping feeling.

Matter fact, ac delco oil filters is the only one I trust.

Aftermarket parts must meet or exceed OEM quality. You are paying for the delco name, research that brand though and see what the company is about before you buy it, you already know delco is quality, itll fit and its dependable.

[Rob_0126]

Aftermarket parts must meet or exceed OEM quality. You are paying for the delco name, research that brand though and see what the company is about before you buy it, you already know delco is quality, itll fit and its dependable.

Echlin seems to be a quality part maker. I haven't had any problems with there product.

Deciding whether I should just leave the egr plugged, cause the truck runs fine. I know the thing about high temp gases causing pinging, etc, but I got to wonder, all those years vehicles didnt have egr valves and all the emissions crud, and they ran fine, far as I know. Didnt have a problem with the 86 305ho engine I had in my 79 elky; capped the egr hole.

What you think?

[Sparky2263]

Aftermarket egr valves generally come with washers of differing orifice sizes. You look up a chart supplied with the valve and insert the appropriate size orifice. So, the orifice is selected. You can't change spring rate and diaphragm size, material or tension which all affect egr operation. The Delco valve will be correct in all aspects.

There are places to save money. This ain't one of 'em. The above also applies to PCV valves. Much more to it than simply getting the orifice right.

As I said previously, if you simply plug the valve, it will set a code 32 which will induce a less agressive spark advance curve. That will lose power and mileage.

[Rob_0126]

Aftermarket egr valves generally come with washers of differing orifice sizes. You look up a chart supplied with the valve and insert the appropriate size orifice. So, the orifice is selected. You can't change spring rate and diaphragm size, material or tension which all affect egr operation. The Delco valve will be correct in all aspects.

There are places to save money. This ain't one of 'em. The above also applies to PCV valves. Much more to it than simply getting the orifice right.

As I said previously, if you simply plug the valve, it will set a code 32 which will induce a less agressive spark advance curve. That will lose power and mileage.

sigh, how much does the chip cost to get rid of this?

Is it more than buying an ac delco egr valve?

[Sparky2263]

A chip to get rid of the egr (and many other performance enhancing changes) is gonna be $100-250. Do a search here for the different chip suppliers.

I chose to get rid of my egr and get the chip. Well worth it in the long run.

[Rob_0126]

A chip to get rid of the egr (and many other performance enhancing changes) is gonna be $100-250. Do a search here for the different chip suppliers.

I chose to get rid of my egr and get the chip. Well worth it in the long run.

which one did you use? I cant find one yet for my specific year on this site. Maybe Im blind.

[Sparky2263]

I inserted "chip" in our search feature and got tons of hits. Here's one;

http://www.s10planet.com/forum/showthread.php?t=3850&highlight=chip