# Fuel injectors **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** astro, chevrolet\ **Created:** [April 26, 2011, 3:49am UTC](https://community.cartalk.com/t/fuel-injectors/64085 "2011-04-26T03:49:33Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![astovanmagiccarpet](https://avatars.discourse-cdn.com/v4/letter/a/e9a140/32.png) [@astovanmagiccarpet](https://community.cartalk.com/u/astovanmagiccarpet)\ **Post date:** [April 26, 2011, 3:49am UTC](https://community.cartalk.com/t/fuel-injectors/64085/1 "2011-04-26T03:49:33Z")
What is the life expectancy of injectors before fuel economy is affected? I have gotten a range of answers from different sources such as( not neccessary to replace,just clean) to definitley replace after 80,000 to 100,000 miles . I have a 91 astrovan 4.3 L ENGINE with throttle body.Injectors never changed. It has304,000 miles runs good except may occassionally stall when stuck in traffic during summer/spring but starts right up again. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [April 26, 2011, 4:06am UTC](https://community.cartalk.com/t/fuel-injectors/64085/2 "2011-04-26T04:06:45Z")
An easy way to check the injectors spray pattern on a throttle body is with a timing light. Hook up the timing light and start the engine. Point the timing light at the injector noozles. The timing light will have a strobe effect where if there are any droplets of gas coming out of the injectors it will be seen. If all that is seen is a clean cone spray pattern there’s nothing wrong with the injectors. Tester ---
**Author:** ![astovanmagiccarpet](https://avatars.discourse-cdn.com/v4/letter/a/e9a140/32.png) [@astovanmagiccarpet](https://community.cartalk.com/u/astovanmagiccarpet)\ **Post date:** [April 26, 2011, 4:37am UTC](https://community.cartalk.com/t/fuel-injectors/64085/3 "2011-04-26T04:37:29Z")
sounds logical and a great idea thanks