Archive for the 'LeSabre' Category

p0440 Buick LeSabre 2000

Question: My 2000 BuickĀ  LeSabre has just failed the yearly emissions test. It had code PO440 for evap system leak. I changed the gas cap like a mechanic suggested, but the code came right back. What should I try next?

buick-lesabre

buick-lesabre

Answer: OK, you’ve got a leak somewhere in the evaporation system. Mechanics like myself use a smoke machine and scan tools to search for the leaks. Sometimes this can be a Royal Pain. BUT, in the case of your LeSabre, the vent valves go bad quite a bit. So you might take a change and install a new vent valve on the evap system. You can buy it at any dealer and they can show you a picture of where it goes on their computer. Since they’ve had a lot of problems with these vent valves, I’d advise purchasing the newer design valves which only the dealers presently have in stock.



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