General Motors Complaint - LS1 Engine "Piston Slap Defect Scandal"
I made the mistake of buying a new 2000 Chevrolet Silverado 4x4 Z71 Extended Cab truck from Tony Chevrolet of Anchorage. Within 1500 miles I noticed an engine noise and took it to our local dealers service dept in my home town of Wasilla where Tony Chevrolet also happens to have another dealership. I was told the noise was normal and all the new LS1 engines made this noise. I took them at their word because I had always been treated right at this dealership. This truck has been a pure lemon from day 1 with many other numerous problems including a drive train vibration that is still present, with new problems almost monthly. Around 8-2001 I found out a large number of LS1 powered cars and trucks 4.7,5.3,6.0,8.1 Liter engines suffer from a design defect called "Piston Slap". The Firebirds,Camaro and yes, even the Vette motors suffers from this defect. GM has numerous TSB stating there is nothing to worry about, this is just a normal noise your engine makes. If it's normal, why don't all the LS1 engines sound this way? We tried to use the BBB autoline that the GM 800 number recommended and figured we had a open and shut case since the truck had been to the dealership the required amount of times to be considered a lemon. Boy were we wrong. GM has the BBB autoline in their back pocket, why else would they recommend using the program? I have 23000 miles on my truck, you can lay down under the oil pan and listen to the knocking noise coming from above the oil pan. My truck pings on very small hills without a load and it doesn't make a difference what gas is used. A person can leave the engine idling and walk around the front of the truck and hear a tapping noise. But that's normal also! If your thinking about buying a new or low mileage GM car or truck don't! Are you willing to take a chance on your hard earned money? GM will not back up the basic 3 yr 36 K mile warranty and it won't do you a bit of good if they try to sell you a warranty if your buying used. If you happen to own a GM vehicle, next time you change your oil, take a sample and send it into an independent company who does oil analysis and have your oil checked to see if it's clean or dirty. Don't depend on GM to tell you the truth about their oil analysis. If your oil is showing normal wear you got lucky and shouldn't have anything to worry about. If your sample shows abnormal wear it's time to document the findings and get ready for an uphill battle with GM. I'm not a GM basher, I've owned 7 GM vehicles and have been proud to own them. They have been mostly trouble free and the service dept's have always treated me very well. With this Silverado, I've been lied to, cheated and defrauded. I was told GM had a fix for this "customer concern". They would either replace the pistons with the "updated pistons" or have a new engine installed. Now I'm told they will do neither, because there is not a problem. My independent oil analysis tells a different story. I did call GM's 800 Customer service line today 4-17-02 to update our case file and let them know the knocking and pinging is getting worse. I was again told that GM is working on another fix for the "customer concern" issue and they would let us know when they are ready to address the issue. GM has great bunch of hard working employees who are forced to lie about this defect or are told to say nothing at all. If you want to help fight for your rights and have your GM vehicle fixed, take a look at this website link below and it also has links to other sites who are fighting the same cause. There is also a number of the V6 engines used in GM cars that suffer from Piston Slap Defect". The best thing you can do is educate yourself about this Defect. I'm almost sure this will turn into a Class Action Lawsuit/ Scandal before everything is said and done. Remember how GM handled the gas tank defect a numbers of years ago to save a few bucks? Will I buy another GM vehicle? NO! I've persuaded 2 people not to buy new GM pickups, all I had to do was let them listen to my engine. That's at least $60K GM doesn't get a profit from. Hey GM! how many other owners do you think are doing the same thing?
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