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Old 01-03-2022, 01:02 AM   #1
SpeedholeS
 
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Default EGT code ka24e. Do you recommend replacing the EGR valve as well ?

Hi guys and gals,

My 94 d21 is throwing an intermittent exhaust gas temperature sensor code.

I would like to know if it would be wise to replace the EGR valve as well as the EGT sensor ?

Has anyone experience with this ?

I plan to replace the 0xygen sensor and EGT sensor regardless.

Appreciate any input

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Old 01-03-2022, 01:56 AM   #2
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I would take the egr stuff off and clean it before I replaced anything. It’s likely to be clogged.
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Old 01-03-2022, 12:40 PM   #3
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OP: If you haven't removed a KA24E's EGR valve (with the engine in place), you are in for a treat. Start presoaking the big nut on the crossover tube, to the exhaust pipe, for many days with Liquid Wrench, etc. And find/order a new tube before starting -- I got mine via RockAuto.
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Old 01-03-2022, 12:49 PM   #4
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Quote:
Originally Posted by LugNut1990 View Post
OP: If you haven't removed a KA24E's EGR valve (with the engine in place), you are in for a treat. Start presoaking the big nut on the crossover tube, to the exhaust pipe, for many days with Liquid Wrench, etc. And find/order a new tube before starting -- I got mine via RockAuto.
He's right. Soak it hard for days and days. When they put in those tubes, the Japanese engineers never expected anyone to take them out almost 30 years later. This is surgery for sure.
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Old 01-03-2022, 04:07 PM   #5
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The guys are correct on every point about the EGR.

Serious surgery for sure! I did it twice on my KA24E(4-cyl.) I had to push and have the EGR tube scrape the firewall just for it to clear the back end of the engine block to remove it. Not fun. Not in the slightest. I did however have an exhaust leak that was coming from that crossover tube and replaced it with the one in the link. SO MUCH EASIER TO INSTALL, due to the relaxed bends in the tube. It literally slides into place. No fussing with it at all!

But check that the EGR is actually functioning before attempting removal surgery.
1.) Start your truck
2.) Warm it up
3.) CAREFULLY(it's hot under there), push up on the valve from underneath with the truck idling
4.)If while pushing up on the valve the truck starts to sputter and wanting to stall out. Your EGR is good
5.) If while pushing up on the valve while the truck is idling, the truck doesn't sputter and stall out and you've pushed the valve from underneath up and down with no changes in the idle, bad EGR valve

If you decide to remove the EGR Valve, it can be cleaned out very easily. It accumulates sand and particles from the road as you drive the vehicle. It's an open design. Meaning the EGR housing has slots or openings that make up the housing and the valve is exposed to sand and crud potentially causing the valve to stick in place. It's vacuum operated. So any debris caught in between the housing and the valve will cause it to get stuck. I originally cleaned mine out with canned/compressed air used for computers. It worked fine after that. But it eventually failed later. That was the second time I had to remove and replace it.

This is the EGR tube link for anyone interested in checking out that "much easier to install" cross-over tube:

https://www.amazon.com/Genuine-Nissa...%2C209&sr=8-20
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Old 01-04-2022, 11:57 AM   #6
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Quote:
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5.) If while pushing up on the valve while the truck is idling, the truck doesn't sputter and stall out and you've pushed the valve from underneath up and down with no changes in the idle, bad EGR valve
Or the airflow is clogged up.

Get a wrench that fits the big EGR nut. I can't remember if it is a 22mm or 24mm, but you certainly want an actual wrench instead of an adjustable wrench or a pipe wrench.

If it looks clogged up (most likely), you can use carburetor cleaner on it, but you may also need some sort of pick tool to dig the carbon out.
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Old 01-04-2022, 12:41 PM   #7
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Or just buy a new valve; aftermarkets are not that expensive. And at this age, replacing is a good choice for future reliability.
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Old 01-04-2022, 02:45 PM   #8
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Or just buy a new valve; aftermarkets are not that expensive. And at this age, replacing is a good choice for future reliability.
+1

You are still going to need a big wrench to get the old one off, though.
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Old 01-05-2022, 06:05 PM   #9
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Thanks for the heads up everyone. I'll definitely address the EGR valve as well as the EGT sensor.

This is the first American Nissan I've owned. All of the Canadian trucks do not have an EGT sensor to throw the fuel ratios out of whack. So I've never run into this issue even on ka24e engines with 500,000km.

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