Cylinder 1 hesitation


#1

what would cause intermitant hesitation when AT down shifts climbing a grade in cruise mode or not incruise. have changed plug wire and plug 3 times and also changed coil…no help

1997 e-150 140K miles


#2

fuel filter


#3

would it only cause a check engine lite indicating cylinder 1?


#4

Probably not. If you’re getting a misfire in cylinder #1 it’s either an ignition problem or the fuel injector for that cylinder.


#5

Are you getting a DTC PO301 (misfire #1)? If you want to see if it’s caused by the fuel injector, swap #1 fuel injector with another. Run the truck for two “trips”. If the misfire (DTC P030x) goes to the other cylinder, the fuel injector was the fault.


#6

taking it my mech on monday he was trying less expensive fixes but did think it may be the fuel injector
I will suggest switching injectors as suggested
much thanks to you both


#7

nm


#8

this latest check engine lite was indicating cylinder 6 and new wire and plug seems to have worked… so far so good