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.
With the metabolism of phenylalanine taking a backseat, its concentration in the blood and urine increases. In such circumstances, the urine is said to be emitting a strong, foul, musty or mousy smell. Other Causes-. Diabetes: Health problems too can lead to foul smell in urine.