# 1996 Toyota Previa - Black exhaust **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** toyota\ **Created:** [May 31, 2020, 3:31pm UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106 "2020-05-31T15:31:45Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Bubba19](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Bubba19](https://community.cartalk.com/u/Bubba19)\ **Post date:** [May 31, 2020, 3:31pm UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106/1 "2020-05-31T15:31:46Z")
96 Previa SC black exhaust and rough engine ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [May 31, 2020, 9:01pm UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106/2 "2020-05-31T21:01:42Z")
Is the check engine light on? Offhand it sounds like the throttle body needs to be cleaned or possibly the timing is off. ---
**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:** [June 1, 2020, 12:22am UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106/3 "2020-06-01T00:22:42Z")
Have someone check if the coolant temp sensor for the computer is bad. > **[Symptoms of a Bad or Failing Coolant Temperature Switch (Sensor)](https://www.autoblog.com/2019/07/24/symptoms-of-a-bad-or-failing-coolant-temperature-switch-sensor/)** > > The coolant temperature sensor, also known as the coolant temperature switch, is an engine management system sensor that is used to monitor the temperature of the engine’s coolant. Tester ---
**Author:** ![Bubba19](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Bubba19](https://community.cartalk.com/u/Bubba19)\ **Post date:** [June 1, 2020, 3:54pm UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106/4 "2020-06-01T15:54:08Z")
Thanks Dave for the suggestion. I also think the EGR might need cleaning. Do you have any suggestions on how to clean or remove to clean? Brian ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [June 1, 2020, 4:45pm UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106/5 "2020-06-01T16:45:57Z")
Here’s a description of how to clean your vehicle’s EGR valve, courtesy of the folks at NAPA. [http://knowhow.napaonline.com/clean-egr-valve/](http://knowhow.napaonline.com/clean-egr-valve/) If you were talking about the throttle body, the folks at Mobil have you covered. [https://www.mobil.com/en/lubricants/for-personal-vehicles/auto-care/vehicle-maintenance/how-to-do-it-yourself/proper-throttle-body-cleaning-guide](https://www.mobil.com/en/lubricants/for-personal-vehicles/auto-care/vehicle-maintenance/how-to-do-it-yourself/proper-throttle-body-cleaning-guide) ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [June 1, 2020, 5:16pm UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106/6 "2020-06-01T17:16:09Z")
Is the check engine light on? ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [June 1, 2020, 5:39pm UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106/7 "2020-06-01T17:39:34Z")
> [@texases](#): > > Is the check engine light on? I asked that yesterday. We still don’t have an answer. ---
**Author:** ![Bubba19](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Bubba19](https://community.cartalk.com/u/Bubba19)\ **Post date:** [June 1, 2020, 6:01pm UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106/8 "2020-06-01T18:01:45Z")
Yes, the CEL is on, black exhaust & rough idle. B ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [June 1, 2020, 6:07pm UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106/9 "2020-06-01T18:07:25Z")
Okay then, the check engine light means the van has stored a code. Go to any shop or auto parts store and have the code read, that will tell you where to look. Post back with the result. ---
**Author:** ![MikeInNH](https://avatars.discourse-cdn.com/v4/letter/m/a587f6/32.png) [@MikeInNH](https://community.cartalk.com/u/MikeInNH)\ **Post date:** [June 1, 2020, 6:08pm UTC](https://community.cartalk.com/t/1996-toyota-previa-black-exhaust/165106/10 "2020-06-01T18:08:07Z")
> [@Bubba19](#): > > Yes, the CEL is on, black exhaust & rough idle. First thing to do is get the code read. It’ll give you a more definitive answer to what the problem could be.