Rich G

93 f-350 7.5l automatic 2wd

I changed the battery and now the truck runs like crap, it stutters and the check engine light flicks on/off.

This problem is super intermittent... what I noticed though is that when it's running bad the computer won't run codes (the code scanner just says 000 and the self test won't start), it also seems like the fuel pump will just continue to run. It's hit or miss.. when it runs bad it has no power, seems like it's trying to move out from second or third gear and idles terribly.. check engine light flickers on and off. Then, the next minute it runs perfectly.

It ran perfectly before changing the battery and ever since has problem.

Just tried pulling the codes again and got KOEO/CM it got a 10,20,30 and that was it... what's weird is it took quite a while for that test to run and even when I removed the code scanner the stuff under the hood continued to click and actuate... I want to say it's the computer but just hate to guess..

Any advice is appreciated.

Chris_1

iTrader: (1)

Check the ground

Rich G

What ground? The big battery cable?

BLDTruth

Yes its the most likely culprit considering you just changed the battery. The continous fuel pump problem is a sign of a bad ground as well. Might just want to follow that black battery cable and clean up all the connections.

Rich G

Will do, thanks

88xlt

You didn't by chance put the battery in backwards, ie the positive battery post hooked to the ground cable? Not likely with the posts being different sizes but it could happen. Just a thought.

Rich G

Nope, thanks for the suggestion though.

Fleet truck

This happened to me two weeks ago - warning light sometimes came on, and when it did it ran poorly. Battery and ground connections were good. Turned out to be a loose connection to the alternator. Pushed it back in and it was good to go. Good luck.