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Ask Peter Bagley Your Own Question
Peter Bagley
Peter Bagley, Toyota mastertech
Category: Saturn
Satisfied Customers: 510
Experience:  master tech at Toyota dealer
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99 saturn sl2, EGR valve stays open, causing poor

Customer Question

Hi! 99 saturn sl2, EGR valve stays open, causing poor acceleration, slugglish, jerking, so changed out EGR valve, but no change. Mechanic just disconnected, and runs fine, but I want to correct problem
JA: What is the model of your '99 Saturn?
Customer: sl2
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: changed plugs, and rear cat converter, and EGR vavle
JA: Anything else you want the mechanic to know before I connect you?
Customer: Yes, Need to know why EGR valve staying open?
JA: How many miles are on the car? Have you noticed any leaks lately?
Customer: 164,000 no
Submitted: 4 months ago.
Category: Saturn
Expert:  Peter Bagley replied 4 months ago.

Hello and welcome to just answer. I value your input to my questions so I may help you better. Is there any engine light on or trouble codes? Is your EGR vacuum or linear type?

Customer: replied 4 months ago.
Linear, I'm getting P0405, but it is disconnected now to keep valve closed.
Customer: replied 4 months ago.
I need to know if it sounds like a connector issue, or could it be the PCM(ECM)?
Expert:  Peter Bagley replied 4 months ago.

Just a moment I have the wiring for this

Expert:  Peter Bagley replied 4 months ago.

Here is the wiring for the EGR

Customer: replied 4 months ago.
Does it have a fail safe on these that would cause it fail open?
Expert:  Peter Bagley replied 4 months ago.

What I see is that the map sensor comes into play as this type of EGR operates on pressure readings rather then vacuum, and the only one input for that is the map sensor. I would check that and it's connector first before looking at the ECU

Customer: replied 4 months ago.
Thank you, ***** ***** that's okay, then the next step would be the ECU?
Expert:  Peter Bagley replied 4 months ago.

Yes if the proper message is sent at the right time to the ECU then it can be the ECU is reading wrong.but check that first.

Customer: replied 4 months ago.
Okay, I'll try that when I get home. Thank You!
Expert:  Peter Bagley replied 4 months ago.

good luck and let me know