Defective ignition coil(s) Bad spark plug(s), spark plug wires, or spark plug boots. Faulty fuel injector(s) Malfunctioning fuel delivery system (fuel pump, fuel pump relay, fuel injectors, or fuel filter) Major engine vacuum leak. EGR valve stuck in the wide open position. Clogged EGR ports.
The following conditions can sometimes cause smelly urine, but they are uncommon: 1  urinary stones â these may cause an ammonia-like odour (read about bladder stones and kidney stones) 2  a bladder fistula â this is an abnormal connection between your intestines and bladder.
Urine odor. Urine odor: Introduction. Urine odor: Smelly urine or urine odor symptoms. See detailed information below for a list of 12 causes of Urine odor, Symptom Checker, including diseases and drug side effect causes. Â» Review Causes of Urine odor: Causes | Symptom Checker Â».