# Truck blows white smoke when first starting up need to pass emissions what can i do **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, 1500\ **Created:** [September 13, 2018, 5:13am UTC](https://community.cartalk.com/t/truck-blows-white-smoke-when-first-starting-up-need-to-pass-emissions-what-can-i-do/124910 "2018-09-13T05:13:23Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\ **Post date:** [September 14, 2018, 4:19am UTC](https://community.cartalk.com/t/truck-blows-white-smoke-when-first-starting-up-need-to-pass-emissions-what-can-i-do/124910/7 "2018-09-14T04:19:23Z")
This is a link to an old thread that detailed what I did to get a 1993 Caprice to pass emissions testing in NJ. > [@Failed NJ Emissions, High HC and CO at Idle](https://community.cartalk.com/t/failed-nj-emissions-high-hc-and-co-at-idle/54230): > > Background 1993 Chevrolet Caprice 5.0 V8 (L03) TBI 76.4k miles, driven 944 miles since 1/1/10 New AC Delco plugs installed at 74141 miles, 9/17/09. Original O2 sensor and catalytic converter, no check engine light (OBD-I) Took the Caprice to the NJ Inspection station. HC (Standard - 220 ppm) Idle reading: 3735 High Idle reading: 79 CO (Standard - 1.20%) Idle reading: 4.36% High Idle reading: 0.36% Any thoughts why there is such a large diffe… DB is correct, you have to get the cat good and hot to pass. The Caprice failed once because the wait at the Inspection station was too long. Good luck, Ed B. --- _[View the full topic](https://community.cartalk.com/t/truck-blows-white-smoke-when-first-starting-up-need-to-pass-emissions-what-can-i-do/124910)._