2003 Hyundai Sonata engine hesitates

2003 HYUNDAI SONATA
32,000 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
SOUTHSTAR
  • MEMBER
  • 1 POST
I recently had my oiled changed 2 weeks ago. since then my car feels like it is getting ready to stall while driving on the road. When I come to a stop and proceed to go forward it only goes about 5-10 mph then eventually goes into gear? Could they have put the incorrect oil in my car. They used a Prolene QT 10W30 oil
Jul 16, 2009 at 2:19 PM
Advertisement
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
2003 Hyundai Sonata engine hesitates

Possible causes on hesitation:

Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
Jul 16, 2009 at 2:35 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
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 new question

Frequently Asked Problems for This Vehicle