Tag Archives: EGR

EGR valve problems can cause a check engine light. Read our latest questions and answer articles.


2001 Pontiac Grand Prix Check Engine Light

I recently replaced my EGR valve because the check engine light code came up on my car, along with that I also had to replace my catalytic convertor, from what the mechanic I went to said, is that the bad EGR valve caused the catalytic converter to clog, I don’t know how true this is because…

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1999 Buick Park Avenue Stalls In Park and Turning

I have a 1999 Buick Park Avenue that stalls while decelerating and the gauges go crazy also sitting in park stalls and when turning corners. Seems like you might have a wiring problem that is acting up when the engine/drivetrain moves. An engine harness could be rubbing somewhere and making contact on decel or turns.…

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Location Of 2000 Buick Century Emission Control Valve

I cant find the  emission control, the picture is too blurry to see it. Can you help? I have a 2000 Buick century 2000. And p0440 and p0442 says i have a leak also. ProTech What emission control component are you looking for? There are many on each vehicle.The codes you have are both for…

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2002 Chevrolet Malibu Has A Very High Idle

2002 Chevy Malibu w/3.4L idles @3,000 rpm. The TPS, PCV, fuel filter, fuel pump assembly, and charcoal canister was replaced after vacuum hoses were repaired. What else could cause this problem? Well really the only thing that will do that would be a bad throttle position sensor, or a major vacuum leak. A stuck open…

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Vehicle Emissions System Problems And Repairs

Based on the amount of repairs we do on emission components on just about every type of vehicle, I thought I would write an article talking more about the parts and workings of the emission control systems on late model vehicles. More often than not, when we get a car or truck that comes in…

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1996 Pontiac Grand Am Code P0171 and EGR

HI,I have a 1996 Pontiac Grand am that has two codes P0401 and P0171 can the two be relayed I know one is EGR flow insufficient and the other is fuel system lean. do you think the EGR Valve is staying open causing the lean. ProTech: They can be related yes. The p0171 is a lean code, and…

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2003 Chevy Silverado Check Engine Light and Transmission Slipping

What is the cause of reduced engine power? ProTech: What year, make and model of vehicle? 2003 Chevy Silverado 1500hd 6.0 engine. Is the check engine light on as well? Most times there has been a failure on a computer controlled component that has set the check engine light on, and that will usually cause…

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2001 Pontiac Grand Prix Service Engine Light P1404

The service engine soon light came on and when the diagnostic code registered a P1404 number. What is that? I had the converter changed several months ago because it was plugged. ProTech: What year and model vehicle do you have? 2001 Pontiac Gran Prix GT with 3.8L V-6. The EGR valve? Ok, that code is…

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Location of Coolant Bypass on Chevrolet Impala 3800

Were is the bypass hose on a 3800 V6. ProTech: Are you referring to the coolant bypass hose? Yes The 3800 does not really have a bypass hose. It is a small plastic 90 degree elbow. It is located in the upper intake manifold on the front of the engine. I was thinking that because…

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