OK so I have been doing some searching the last 3 hours. All I keep coming up with is circles on what it could be.

CEL codes 0901, 0304, 0608

now from what I read the O2 sensor can be caused by the misfire from cylinder 1. also vice versa that misfire can cause the other.

car ran fine up until tonight. Got off work car hand CEL on all a sudden drove home fine though. Ran codes, did search came back out and car was shaking bad while in Drive (auto) and holding down brake pedal. once I start to drive the car drives perfectly fine. Once i slow down and start Braking RPMs drop to below 500 and the shaking starts again. I can hear a noise from the engine, pinging or ticking or knocking type of noise never heard before....

any ideas and help is appreciated. thanks in advance

 

What are codes : 0901 - 0304 - 0608 ????? I'm not taking the time to look them up cause I'm pressed for time. Sounds like a bad coil pack ... but what are the codes?

 

0901 is the Front Right Htd 02 sensor heater, 0304 is knock sensor, 0608 is the cylinder 1 misfire. Could the coil packs really cause that shaking though...

 

I would address the more serious codes which pertains to misfires first. Chances are the other codes will be fixed when you find the problem.

Three main things to check.

1. Loss of spark. (Dead coil, dead spark plug, dead spark plug wire)
I mention spark plug wire AND coil because I'm not sure if a 95 max is coil over plug.

Run the engine and start pulling out each coil. You'll notice a drop in RPM as you pull a coil, if you do, put it back on the spark plug and keep going. Chances are you're going to find one that doesn't change engine RPM at all. That's where you wanna focus your diagnostic. At that point you can swap a coil that you know is good with the one you know is bad (EX: if you find coil 2 has no change in rpm when you pull it, switch it with coil 3. After that if pulling coil 3 doesnt make any RPM change you know the coil is bad.

2. Bad spark plug.
same procedure as #1 except you're pulling the spark plug out of the one where there was no change with removal of the coil.

3. Loss of compression in a cylinder. You'll need a compression tester for this test.

Hope this helps.

M.

 

Remove and check spark plug for fouling. If its good, then swap the coil packs with another and clear codes. If the misfire comes back on the same cylinder, then its the fuel injector.

 

thanks for all the help I will try all those and hopefully get things fixed. And to be sure the front coil packs should be the ones I need since they fire left to right the rears would be my last 3. correct me if I am wrong

 

Looking at the front of the engine bay, this is your cylinder numbers

1 3 5 (back of engine)

2 4 6 (front of engine)

 

got it. Thanks for all the help. Hope I can resolve this easily.

 

Yes absolutely a dead coil could cause the shaking. I just fixed a friend of mine's accent 2008 with the exact same problem ur describing. Except hers was a 4 cyl so the shaking was way worse. Turned out to be a bad coil.

Someone mentioned injector, that can be true but i'd put my money on a coil gone.

 

im starting to think its the spark plug. I just pulled the each coil one by one to see the loss in rpms the number 1 didnt move. and didnt move when i moved another coil to that spot. i had to stop cuz it was too late and i couldnt find my spark plug wrench....

 

Well, ur making progress

In that case, one of two things. Spark plug or bad injector. Swap spark plugs and see if that changes anything. If not you might wanna start checking resistance values on injector #1 You can check the injector pulse with a noid light also if you're equipped for that

your injector resistance should be between 10-14 Ohms If it's not between this spec, the injector is faulty.

Check if you have power going to that injector also:
Unplug the connector to injector #1. With the engine off and key on you should have 12V at the connector's red wire when you plug one end of the DVOM into the red wire and the other on a ground source.

Also if you plug back in the connector and run the car. You can backprobe the injector's connector and you should see it bounce between 0-12V on your DVOM.

Hope this helps

M.

 

Ya making progress slowly but surely.

Ya first thing I'll do is swap the spark plugs tomorrow
and see what results I get. I'm hoping it's that. Best case scenario. Not really looking forward to do the injector. It's odd too after I unplugged the coils and did the last few things. The major shaking stopped. The car was back to normal idle rpms. But the cel is still on and the misfire is still there

 

ok as for a update I replaced all spark plugs and reset ecu. car started fine had low idle for a odd reason, hoping that will go away. drove for about 10 mins and no CEL.
lets see how the next day goes and if anything changes

thanks for all the help so far so good.....