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Username Post: EGR Valve Replacement        (Topic#364079)
Blueseasons 
Contributor
Posts: 190

Reg: 10-13-11
01-21-21 09:12 PM - Post#2812596    

I live in the chit state of California and we have mandated emissions test every 2 years. I took the 88 K1500, 350 in today and I was told the EGR isnt pulling vacuum. I have 2 questions about this. 1. If it is broken shouldnt that cause the "check engine" light to go on? Thats what happened 10 years ago when it went out. 2. I have one on order. When I install it do I need to do anything like clear codes or some other ritual to make it work, or does it just kick in? thanks.



 
CowboyTrukr 
"10th Year" Silver Supporting Member
Posts: 4568
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
01-21-21 11:06 PM - Post#2812598    
    In response to Blueseasons

Clearing codes on an ‘88 is very easy. Disconnect the battery ground for about 30 seconds. Reconnect and you’re good.

The EGR will work as needed without any additional process.

You ordered the EGR, or the EGR solenoid?

Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
Blueseasons 
Contributor
Posts: 190

Reg: 10-13-11
01-22-21 08:37 AM - Post#2812628    
    In response to CowboyTrukr

EGR. Valve. The guy said it, the valve, wasnt holding vacuum and i asked should I just replace it. He said yes. I have no idea what a EGR Selinod is. A few months ago I had an intermittent idle problem. It would start fine, then run rough, lose power and the Check Engine light would come on. After a while it would clear up and drive fine. This condition eventually went away. I chalked it up to a temporary carbon clog in the EGR, which I know can happen. I was surprised it didnt pass inspection. It starts and runs fine. No symptoms that either part isnt working. How can I tell if its the valve or the solenoid?




Edited by Blueseasons on 01-22-21 08:52 AM. Reason for edit: No reason given.

 
CowboyTrukr 
"10th Year" Silver Supporting Member
Posts: 4568
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
01-22-21 01:54 PM - Post#2812646    
    In response to Blueseasons

The valve should be able to be tested by using a hand vacuum pump. You should be able to draw vacuum and have it hold indefinitely. Doing it while the engine is running will tell you instantly if it opens, as well.

There is a check to make sure the EGR solenoid is plumbed correctly as well.

Here’s where the vacuum source gets connected.



Attachment: FE73E313-750D-44F4-8D60-100447D41A4E.png (950.04 KB) 17 View(s)

Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
rockfangd 
"8th Year" Gold Supporting Member
Posts: 3090
rockfangd
Age: 34
Loc: Utica ny
Reg: 04-13-10
01-22-21 04:41 PM - Post#2812656    
    In response to CowboyTrukr

also must make sure it is the correct one.
There are 2 types. Positive, and Negative.
You can tell which one it has by the solenoid type.
If you can get the numbers off the old egr valve that may help as well.
Not surprised the engine light is not on. Those lights are almost non existent. I forgot my 90 even had one lol. Only came on once in the 12 years I had it.
I feel bad for you having to get emissions inspection on a vintage vehicle. Should be exempt as there are so few left

Old School GM fan FOREVER


 
Blueseasons 
Contributor
Posts: 190

Reg: 10-13-11
01-23-21 05:41 AM - Post#2812706    
    In response to rockfangd

It does suck. But California has taken it upon itself to force its citizens to be responsible for cleaning the air for the rest of the planet and that comes at a price. We have "special" gasoline here too. Only used here so it can only be made here so its very expensive as well. They charge MORE for doing my truck because it is old. The newer ones take less time and effort. I have had this truck for over 12 years and I know little about it, simply because it has had very few problems. It's an automatic and shifts pretty bad but it's been great otherwise. Our other 2 vehciles are WJ Jeeps. Whole different story. The last time I had to replace the EGR valve. It was $25. I just paid $70 for this one! WTH?



 
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