question

iTrader: (2)

Hey guys, recently I was experiencing a cylinder 7 misfire, so I changed my plugs and wires and clean the maf. The car runs good, put sometimes is idling rough and my scanner is saying Cylinder 7 misfire still. It was saying this before I changed the plugs and wires also. I clean my maf with some MAF cleaner, and cleaned the TB blade with some carb cleaner. My car is running a lot better, and the only codes it are throwing are the ones for the misfire, and for my knock sensor. Would a knock sensor cause a misfire like this? I wouldn't think so, but what do you guys think? Do you think it could be a bad coil pack? Any info is appreciated.

spaz1

iTrader: (9)

I don't think a knock sensor would cause this. I 'd swap the coil pack to another cyl and see if the miss moves. If that doesn't change anything move the injector. If that doesn't do anything then Comp test?

98transamtx

iTrader: (1)

it's the coil!

question

iTrader: (2)

Thanks man, gonna swap em around and see what happens. Anyone know how much a single coil pack costs?

LS1Aggie

iTrader: (2)

You can pick up a coil pack for $60-$100 depending on the brand you want. They are available at Autozone and other parts stores.

question

iTrader: (2)

So...swapped the coil pack from Cylinder 1 to Cyl 7 and vis versa, cleared codes and took her for a driver. Pop, P0307..cylinder 7 misfire. Where do I go from here? Should I check the injector or move straight to a compression check? Is there anything else I may be over looking?

question

iTrader: (2)

Like to get a little more work done on this today if the daylight is good, should I proceed with swapping injectors?

LS6427

iTrader: (2)

Of course, a leaky injector will cause a misfire.

Could be bad wiring that goes to the coil.

spaz1

iTrader: (9)

I'd say it is probably the injector. It seems like the rear ones get all the **** that is in the fuel system.

608kZ28

i have this very same problem. lol

9987ta

Valve spring may be cracked or broken...check compression in that cylinder.

therobman

iTrader: (39)

i had the same problem in number 7 and eventually blew the motor #7 ringland let go i hope this is not ur case

question

iTrader: (2)

Ouch, some scary replies out there. What is the easiest way to go about swapping injectors? Lets hope that this is the case. Any insight is appreciated it, if you have the same problem post in here!

Now this is just me thinking, BUT is it possible using seafoam could of messed up an injector in a higher mile car? It seems to be about the time my performance went downhill was AFTER I seafoamed. Just food for thought.

608kZ28

im gonna swap the coil packs tommorow

question

iTrader: (2)

Let me know how it goes, we seem to be in the same boat.

608kZ28

well its not the coil pack. im just fearing its something big thats causing the issue.

spaz1

iTrader: (9)

It's the injector then. Think positive.

608kZ28

im trying too. i love this car

cntrmnt02ss

iTrader: (2)

my friends trans am had a bent valve on #7

cntrmnt02ss

iTrader: (2)

leak down test #7 that will pinpoint your problem if you got good leakage on #7, look at the injector