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No acceleration after replacing the EGR valve?

Tiny
RANDYDUNN10
  • MEMBER
  • 2003 MAZDA TRIBUTE
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
EGR valve had a hole blown in the side, replaced the EGR valve now the car won’t accelerate.
Saturday, January 28th, 2023 AT 7:18 AM

17 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Hi,

When you replaced the EGR, was a new gasket used? Also, there is a vacuum supply to the EGR. Is that connected? If you start the engine and remove the vacuum hose, is there a vacuum source present?

Let me know.

Joe

See pic below.
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Saturday, January 28th, 2023 AT 10:24 PM
Tiny
RANDYDUNN10
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New gasket with EGR valve. No strong vacuum present.
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Sunday, January 29th, 2023 AT 7:09 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

Follow the vacuum hose to see if it is cracked, damaged in any or disconnected.

Let me know what you find.

Joe
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Sunday, January 29th, 2023 AT 3:02 PM
Tiny
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Should there be strong vacuum?
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Sunday, January 29th, 2023 AT 3:22 PM
Tiny
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What causes the side to blow out on an EGR valve?
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Sunday, January 29th, 2023 AT 3:23 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

As far as the vacuum, it is controlled by an electronic vacuum regulator valve. So vacuum changes based on conditions. It will fully actuate the EGR once the vehicle is warm, under a moderate load, and the PCM determines it can open

The thing is this. If there is no power, it sounds like the EGR is open at all times. We need a vacuum for it to open, so let's try something.

I attached a pic of the EGR vacuum regulator below. Allow that to remain connected, but I want you to remove the vacuum supply at the EGR itself. At the end of the vacuum hose you disconnected, plug it with a screw or something that will prevent vacuum loss.

Test drive it and see if it runs any differently. If it does, the regulator may be faulty

Let me know what you find.

Joe

See pic below.
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Monday, January 30th, 2023 AT 3:34 PM
Tiny
RANDYDUNN10
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No pictures, I’ll be heading back to the shop tomorrow and I’ll let you know what I find.
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Monday, January 30th, 2023 AT 3:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Hi,

Wow. I'm getting old. LOL Sorry about that. I did attach it this time. If you can, before taking it in, try what I suggested. It will only take a couple of minutes.

Let me know.

Take care,

Joe

See pic below.
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Monday, January 30th, 2023 AT 7:40 PM
Tiny
RANDYDUNN10
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Would this cause the valve to explode?
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Tuesday, January 31st, 2023 AT 3:14 AM
Tiny
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Okay, tried what you recommended. No change.
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Tuesday, January 31st, 2023 AT 12:26 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

Okay, I was thinking something was causing full vacuum at all times and the valve was being held open. Were you able to take it in today?

As far as the damage, the only thing I could think of is if it cracked, damaged, or removed and not installed correctly. Do you have a pic of it that I could see?

Let me know.

Joe
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Tuesday, January 31st, 2023 AT 6:43 PM
Tiny
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I have not taken it to a shop. I was hoping we could figure it out.
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Tuesday, January 31st, 2023 AT 6:55 PM
Tiny
RANDYDUNN10
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The EGR valve that exploded was the pen part.
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Tuesday, January 31st, 2023 AT 6:56 PM
Tiny
JACOBANDNICKOLAS
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Hi,

That's an odd one. Do you remember any backfiring? Also, could you have a plugged catalytic converter?

Joe
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Tuesday, January 31st, 2023 AT 7:03 PM
Tiny
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Could a bad catalytic converter throw a check engine light?
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Wednesday, February 1st, 2023 AT 1:12 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

If the converter was bad, it should set a code such as a P0420. However, anything is possible.

Also, since we had an EGR that was blown out, that could have been an escape for the exhaust if the converter was an issue. Once you installed the EGR with a new one, the leak was repaired as well. A plugged converter will certainly cause a power loss. Take a look through this link. Also, as a simple test, remove the upstream oxygen sensor (pre-cat) and see if you get the power back.

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

Let me know.

Joe
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Wednesday, February 1st, 2023 AT 1:58 PM
Tiny
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Sent it to a shop today. I’ll let you know what they say.
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Wednesday, February 1st, 2023 AT 3:14 PM

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