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.
Healthy urine may have a mild smell but generally does not have a foul odor. In some cases, an unusual or strong urine odor may be due to benign conditions that are not harmful, such as eating certain foods or taking certain medications.rine odor can be a symptom of a variety of conditions, including infection, inflammation, or other conditions of the urinary tract (kidneys, ureters, bladder and urethra). Urine odor can also be caused by diseases, such as diabetes and dehydration, which affect the urinary tract as well as other body systems.