I have a misfire on all 4 cylinders. It is something to do with the fuel system. I'm trying to all diy checks before I buy any new parts.
I have used seafoam only in the gas tank while I had the misfire and it went away for the rest of that tank but as soon as all the seafoam is gone it comes back. The fuse is good for the fuel pump. I couldn't find which really is for the fuel pump though. I was also wondering how to check the fuel pump with a multimeter.
If anyone has any other suggestions on what to do please let me know.
Thanks in advance!

 

Bump

 

Read my thread on my misfiring problems. Good place to start. Give a case of techron a run through. Worked for me.

 

Buy higher test gas from a different source. This happened to me at the very beginning when I found myself in the middle of nowhere in the middle of the night on the way home and had to buy 92 octane from a truck stop. I will NEVER make that mistake again, scared the crap out of me. I'm going 93+ from now on, NO MATTER WHAT.

 

After it started I have tried multiple different gas stations including an ethanol free 93 I have near me with no changes. The cel will go off with great has but it still misses. It's not a constant miss either I just randomly misses. Mainly when idling and heavy throttle

 

Nota loafer you got a link to it?

 

How did you decide it has to be the fuel system?

 

Your issues could be one of many things. e.g. coils, spark plugs, injectors, valves, rings, fuel pump, etc.

We need more information. If you can, try and find a buddy who you can trade coil packs with. If your plugs are old, replace them and chalk it up as routine maintenance anyway. If the problem still persists see about swapping some injectors. You can also do a leak down test to see if you're losing combustion and where/how much.

 

^ agree.

You can also post in your sub-forum and see if anyone is willing to swap parts with you.

 

I already replaced plugs. I did the hearing test on the coils where you pull it out and see if the motor bogs down and all four of them changed it so those are good
I have it down to fuel because seafoam in the gas tank fixed the problem until that tank was empty