I have a grand caravan with a misfire on cyl 5at idle only. have swapped coil, plug , injector, smoke tested, performed 2 induction services. did a compression test, 145-155 across all cyl. tested voltage at coils. all at 14v. removed valve cover, nothing looks out of the ordinary no broken spring or worn cam from what i can see. will only miss at idle on cyl 5. no miss while driving has good power.

UPDATE: performed leak down test on cyl 1-3-5. all only had 10% leakage. looked at injectors with the autel and found cyl 5 to be reading 1500 us, while the rest of the cylinders were closer to 1800 us. hold the rpm above 2300 and all injectors even out. #5 seems to be reading lower at idle. tested for voltage and it seems to be the same with other cyl. i had already swapped injectors with other cyl. need to see how to test the ecm or wiring on why that injector would be reading less. ALSO, dealer has declined any warranty since it is on bank 1. they would if it were on bank 2

Alan Guesnard
Shop Foreman
Autobahn Service Center
Plano, Texas, USA