Rough idle then a bad miss with blinking check engine light

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rocky

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Started up with rough idle then as i accelerated felt a bad miss then check engine light started blinking , pulled over and light quit blinking and went out . Still running rough ...............260k miles , this happened before and i believe the shop replaced a coil pack , probably another has gone bad ?
 

Judge Mills

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Sounds like a bad coil, but, you need to pull the codes first. Places like Autozone will read your codes for free.
 

MWguns

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Def need to pull codes first. I had an issue similar to yours, and was only getting a single lean code P0174 i believe. I checked all my vacuum lines, and ended up needing to put a fuel pump and filter in it. Runs like a top now.
 

jaytron

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I second checking for vacuum...the PCV line/valve is common problem.....spray some brake cleaner when idling rough in area along the PCV line and if it picks up to normal then you have a leak somewhere(might not be the PCV line just a vacuum leak also)
 

Judge Mills

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Doesn't brake cleaner melt certain types of plastic?

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texasscot

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Get codes (best to buy a cheap reader).
Identify which cylinder is misfiring.
Swap coilpack from the misfiring cylinder with one of the others.
Clear codes.
Start engine.
If code reappears on the same cylinder, pull spark plug and check gap. If gap is big get new plug.
If code appears on the cylinder you put the coilpack from the original misfiring cylinder on, change the bad coilpack.
You can buy 8 coils on eBay for around the price on one at the local autostore.
If this doesnt work then its something else :)
 

cmeswme

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I have a 2003 Ford Expedition with the 4.6 engine, 2 wheel drive. Having similar problem. Inconsistently go to accelerate and I get the hesitation or mild sputtering. But no check engine light. Funny though, I notice this happening on and off around 41 mph. I'm scratching my head to change all the plugs or coils, maybe replace the injectors ??? Checked for codes, nothing there, no codes. :(
 
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