1999 Dodge Dakota Didn't pass smog

1999 DODGE DAKOTA
Avatar
RLVB
  • MEMBER
  • 2 POSTS
1999 Dodge Dakota 6 cyl Automatic 176618 miles

My NO reading was too high at 15mph and close to too high at 25mph( 15mph max 512 reading 971, 25mph max 765 reading 760). This truck has been very well taken care of. Within the last 5,000 miles it has a completely new exhaust system, including both O2 sensors, a new EVAP system as well as the PCM. I appreciate some help on what to do next.

Thanks,
Jun 29, 2009 at 3:41 PM
Advertisement
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
For a start clean out the EGR valve make sure its opening and closing properly and check the knock sensor
Jun 29, 2009 at 3:47 PM
Avatar
RLVB
  • MEMBER
  • 2 POSTS
I have checked both manuals I have for my V6 3.9L 1999 Dodge Dakota Pick up and I do not have an EGR Valve and I can't find any information regarding a knock sensor. Are there any other suggestions?

Thanks,

RLVB
Jun 29, 2009 at 7:12 PM
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Justr checked my reference Mit1 ondemand5.com it doesn't have the EGR and KS-check the following below

Carbon buildup on pistons and in combustion chamber;

Over-advanced ignition timing;

Defective knock sensor;

Engine overheating (check thermostat, fan, coolant level);

Exhaust restrictions.
Jun 29, 2009 at 10:09 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.