When engine is cold or lukewarm it hesitates and sputters

2003 DODGE RAM
158,000 MILES • 4.7L • V8 • 4WD • AUTOMATIC
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2CARUSER
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  • 1 POST
Hesitates and sputters when engine is cold or lukewarm.
Does not do it when hot. does this only one time, then runs
perfect.
Mar 31, 2019 at 5:33 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good morning,

Any codes stored?

Can you check the fuel pressure? Low fuel pressure will cause this issue.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Also, the EGR valve could also be causing this issue if it is partially open causing a vacuum leak.

Roy
Mar 31, 2019 at 6:07 AM
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