ateupsoldier

it started flashing shortly after i installed new steeda under drive pulleys. it goes off roughly between the 2500-3000 rpm range and kills acceleration. i looked up the diagnostics code and it says cylinders 4 and 7 misfire. is this just a sparkplug issue that coincidentally went off after UDP installation, or is the new UDP's throw something off?

mustangman281

Unless your alt is bad I don't see how underdrives could cause a missfire. Bad sparkplugs won't throw a misfire code.

ateupsoldier

could it be power coils then?

mustangman281

What is your volt meter doing?

ateupsoldier

all the meters are normal, but i did notice the red light on my battary just now, maybe its that? would a low battary cause misfiring?

mustangman281

Go to Advanced, they can test you battery and alt without even taking them out of the car.

ateupsoldier

what is advanced? im currently stationed here in germany so its hard to find people that know what thier doin with anything ford. lol

mustangman281

I was talking about advanced auto parts but I doubt they have it there in germany. You need to get your alternator tested.

ateupsoldier

well i think i fixed the problem, i got a new battery and no lights are flashing now. i did get the alternater checked and they did say it was bad. i think because i have aftermarket pulleys it might read that way. anyways thanx for your advice

96MustangGT23

Attempted to detail car tonight and got a Check engine light after getting engine wet, with lo pressure water.

Any suggestions? Will disconnecting the battery reset computer ?