Technical Car Experts Answers everything you need: EGR solenoid problem

Sunday, October 21, 2012

GMC Sonoma Stalls and idles low

The problem is related to Faulty EGR valve.

First of all in such cases if your check engine light is on then there is a code that needs to be scanned,this could be related to the problem here.Anytime a check engine light comes on this means there is a problem that needs to be checked into.

On most of such cases the problem is noticed due to egr valve that is partially stuck open as this will lower the idle slightly and may stall out the engine.

In case of faulty egr valve the engine will idle slightly rough and possibly cause the truck to shake.

On GMC sonoma egr valve,it is located just in front of your engine throttle body and right in front of the upper radiator hose where it connects to the top of your engine.

Another faulty part can be idle air control motor
That can also cause the low idle and stall.

Visually see if there is any kind of carbon build up in the throttle body bore where the throttle plate is,if you see then get the throttle system cleaned.That carbon build up can cause restricted air flow into the engine at idle and can also cause this.

Now to start your problem troubleshooting,first check by removing the air intake over the top of the throttle body,then take a cloth with some carb cleaner or brake cleaner on it and wipe out the throttle bore with the throttle plate open as best a s possible.Then see if it idles normally and if the stalling is gone.

If it is not then the idle air control motor and Egr valve will need tested with a tester and a scan tool,if found faulty it will need replaced.

Most likely this will either be carbon build up in the throttle body,or a faulty idle air control motor or egr valve.

Get these possibilities checked,these will help.
Thanks.

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Saturday, March 10, 2012

1993 Corvette Coupe Displays Code 26?

In this case the customer noticed Service engine light on dash and in scanning the error code 26 is shown.

In this case as per the error code 26 the problem can be faulty EGR or faulty Vacuum relay controlling EGR or its issue with ECM.

In most of cases ECM checked out to be faulty.

The fault code that is setting is due to the Engine Control Module (ECM) sensing that one of the four outputs of Quad Driver 1 is drawing excessive current. The code sets to alert us to this so that continued over-current does not cause the failure of the ECM. Quad Driver 1 controls the Evap canister purge solenoid, the EGR control solenoid, the AIR solenoid relay, and the AIR bypass solenoid valve. What is likely happening is that under the heat of the engine one of these four solenoids is shorting out causing the code to set. With the fault present the ECM may shut these solenoids off to avoid burning up the quad driver, this may be why you can not test the EGR solenoid with the fault present. One way you can test the EGR solenoid in its failed state would be to test the resistance of the solenoid. I would also suggest to test the solenoid cold so that you have a base line to compare to. What I suspect is that you will find the EGR solenoid is shorting out with the engine hot, you will then see the resistance of the solenoid fall drastically to less than a few ohms. The solenoid will usually be in the 15 to 100 ohm range. I don't know the exact spec for the resistance of the solenoid. Yes you are correct the EGR solenoid is near the fuel rail and has a vacuum line that connects to the EGR valve. I would doubt that you are having an AIR problem as this system does not usually run unless at wide open throttle or just after cold start-up. If you suspect the EGR solenoid you could also disconnect the solenoid then clear the codes. If you drive the vehicle you will cause other codes to set related to the EGR solenoid, but if you don't get the 26 code then you likely have the culprit.

This details will help.
Thanks.

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