91sport_tn

the car will start up and idle fine, at least some of the time. once you rev it up it just seems like it drops a cylinder or two. one plug was fouled, so all new plugs and we checked the wires. firing order is right. what could this be?

Tony71502

Timing way off

91sport_tn

can it get that far off without physically changing it?

Tony71502

Was it running fine before? Did this just start happening?

91sport_tn

it had been running fine, maybe a little rich. this just suddenly happened. were thinking maybe something to do with an injector or fuel rail. I just do not want to tear in to it without a few ideas.

AdderMk2

google: Ford mustang cylinder balance test

mjr46

focus on the cylinder with the fouled plug, use a insulated plier, and pull the plug wire off while car is running and see if you can notice a change in rpms, if none is noticed make sure you have a working plug, if plug is good, do a compression test on that cylinder and go from there.

91sport_tn

Plugs and wires all look to be good, but looks like I have some more things to check. Were going to try and dig up an injector to swap out and see if that helps, if not compression test should be next. I still need to put a new connector on so I can check my codes too, because I'm sure that would help quite a bit. Thanks for your help guys.

Tony71502

Compression tests FIRST. Why throw parts(injector) at it? Check codes first...

mjr46

exactlly!!! why not start with the easiest tests op??