Common questions

What to do if you have a problem with your EGR valve?

What to do if you have a problem with your EGR valve?

Ok, here we go. The quickest way to eliminate a potential problem with your EGR valve is to take it out of the mix completely without having to remove it from the engine. Here is how by-pass it for diagnostic purposes. Loosen the 27mm nut at the egr pipe, the loosen the two at the egr pipe to plenum.

What does it mean when your fuel injector is irregular?

A single, solid spray or irregular pattern means the injector needs cleaning, or that an internal part wore out or broke. You can try to fix an irregular fuel spray pattern by adding a quality cleaning fuel system additive to the fuel tank. Or take your car to the service shop and have them clean the system.

Can a throttle body fuel injector be inspected?

Photo courtesy of Albertas Agejevas on Flickr. Unlike injectors on throttle body fuel injection (TBI) systems, those used on an Electronic Fuel Injection (EFI) configuration don’t have their fuel spraying accessible for inspection.

How can I tell if my EFI injectors are working?

So it’s hard to check the spraying pattern of each injector without the proper equipment. However, you can use a couple of tests that can reveal whether one or more injectors are working on your EFI system and whether the fault is within the injector itself or the controlling circuit.

What does EGR stand for in exhaust valve?

EGR Valve stands for exhaust gas recirculation valve, which breaks down exactly what it does. Recirculating the exhaust does a few things for overall performance. First, it optimizes the fuel to air ratio without pulling in extra air from the intake.

What happens if the EGR valve is open all the time?

If the EGR valve stays open at all times and the exhaust fumes are being fed to the engine constantly, the engine gets deprived of oxygen. With too much fuel burning and less oxygen, a black smoke gets produced and escapes from the exhaust pipe especially when the car is idle.

Can a blanked off EGR improve engine performance?

Of course its not. The EGR pumps warm used air back into the engine instead of cold clean air. If you were to blank of the EGR, it would continuously get cold air thus an improvement in performance. For people looking for the best performance upgrade (such as myself), a remap with a blanked off EGR will provide excellent results.

Is the exhaust gas recirculation valve still present?

ProCarReviews is reader-supported. We may earn commission on sales through our links at no extra cost to you. View policies. The Exhaust Gas Recirculation Valve (often called EGR) is present in the majority of cars post 1990’s.

Why is the Check Engine light not coming on?

Even if the check engine light hasn’t come on, you may find a pending code that can guide you in your diagnosis. False input or lack of input from sensors like the crankshaft position sensor (CKP) or camshaft position sensor (CPS) can prevent the engine from starting.

What causes a 1989 Chev crew cab to stall?

I have a 1989 v3500 chev crew cab with a 454. Started stumbling at low throttle, stalling when I came to a stop or any low rpm activity. Checked for vaccuum leaks, reset base idle, tested sensor components, ran Win aldl diagnostics, could not get it to run right.

Where is the diagnostic box on a 1987 EFI truck?

1985-1986 (and some 1987‘s) EFI trucks do not have this box, you’ll find the spot to jump it at the DRIVERS side fenderwell. It is the connector that has 2 wires (not 1, not 3 or 4, just 2).

What are the symptoms of a faulty EGR valve?

A faulty EGR valve can cause several trouble symptoms to appear. These directly relate to the operation of the engine and emission systems with no effect on the automatic overdrive (AOD) transmission, driveline or nonemission-related equipment. Symptoms can include stalling, rough idle, hesitation upon acceleration and overall power reduction.

When does the Check Engine light come on on an EGR?

Check Engine Light comes on. An illuminated Check Engine Light is another symptom of a bad or failing EGR control solenoid. If the computer detects an issue with the EGR solenoid, circuit, or system, it will set off the Check Engine Light to notify the driver of the issue.

How is the EGR system controlled by the computer?

The EGR system is controlled by the EGR control solenoid. When the EGR control solenoid is activated, a passage is opened up that allows exhaust gases into the intake manifold. The EGR solenoid is controlled by the engine computer, and activated at very specific times in order to achieve…

When did the EGR system start on diesel trucks?

In an attempt to reduce diesel exhaust pollutants, the concept of the Exhaust Gas Re-circulation (EGR) system was implemented on all diesel trucks around the year 2007, per EPA regulations.

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Ruth Doyle