4 Misfire codes!!! - Land Rover Forums : Land Rover and Range Rover Forum

Maximummd · 11-11-2012, 01:06 PM

Ok so the codes are

P0304 Cylinder 4 misfire detected
P0300 Random misfire detected
P0303 Cylinder 3 misfire detected
P1319 Misfire with Low/empty fuel drive cycle C: Signal out of range-above maximum

I just replaced the headgasket a few weeks ago. These codes seemed to of come on during the morning when its nice and cold. Spark plugs where changed and wires were too.(Changed with the STI ones)

Any idea what might be causing these?

Disco Mike · 11-11-2012, 01:17 PM

Sure, 2 mis-fires. Did you use new plugs and 8 mm silicone wires, if so who's.

Maximummd · 11-12-2012, 11:53 AM

Yea new plugs and wires. They were the 8 mm STI wires, and NGK 2756 V Power platinum plugs. I erased the codes and later that night I got the light coming on again. Seemed to happend again. I'll double check the codes later as I have to stop by a auto parts store to check.

Maximummd · 11-12-2012, 06:24 PM

Do you think an exhaust leak around clinder 3&4 could possibly be causing these codes? I was dealing a leak around there earlier. Maybe I didn't fix it all the way.

Plov · 11-13-2012, 05:20 AM

3 and 4 are on opposite banks of the engine so i don't think an exhaust leak could effect both. Have you checked that you don't have the leads the wrong way round for the two plugs. Check against the diagram in this post Multiple cylinder misfire diagnosis help request

Keep us posted on what you find.

Maximummd · 11-15-2012, 06:22 PM

Well since then the check engine light has turned off and hasen't turned back on yet. It's been about 3 days and I ran it throught the DEQ here. Should I just conisder this a one time fluk and not to worry about it again?

Maximummd · 11-16-2012, 12:28 PM

So the check engine light came back on during my drive home yesterday. So I'm going to double check the diagram. But while reading through the topic that you posted Plov I'm wondering if it would be something like a random sparkplug not working so well. So I'll double check that I have the wires right, and pull out the plugs and have a look at them.

Maximummd · 12-01-2012, 12:46 PM

Well, I decided to swap the plugs figuring if it was an issue with the plugs it would then show miss fires on a different cylinder. So I swapped plugs of 3 and 4 cylinder with 1 and 2. I noticed that the plugs werent very tight when I took them out. Made sure to get them tight this time around after the swap. Been 3 days and no lights have come on and the check engine light went out.

Maximummd · 12-02-2012, 04:14 PM

Well didn't work. Guess 4th night did the trick. Engine light popped on again and now these are the codes on it, any ideas?

P1300 catalyst damaging misfire multiple cylinders drive cycle C: signal out of range above maximum
P1415 Secondary air system fault bank 2 drive cycle D: signal implausible
P0308 Cylinder 8 misfire detected
P0306 cylinder 6 misfire detected
P0300 Random misfire detected
P0304 cylinder 4 misfire
P0303 cylinder 3 misfire
P0153 02 circut slow response (bank2, sensor 1)

What is going on here?!?! I never had the cylinder 6 or 8 misfire?

jhdylan · 12-06-2012, 10:47 AM

Coil Packs???? I have just had the 300, 303, 305 and the occasional 307 over the last 3 days... No longer driving. will be replacing the coil packs Tomorrow morning. will let you know if that helps me out.

Disco Mike · 12-06-2012, 11:01 AM

Might want to send me your number and I'll call you, see what might be wrong.

Maximummd · 12-06-2012, 11:20 AM

Quote:

Originally Posted by jhdylan

Coil Packs???? I have just had the 300, 303, 305 and the occasional 307 over the last 3 days... No longer driving. will be replacing the coil packs Tomorrow morning. will let you know if that helps me out.

Could be... I figured it would just give out to slowly die if it was a coil pack. And to have both go out at about the same time?! Then again, I have noticed since yesterday that a few times only when it's cold the engine seems to shutter. Run pretty rough for a bit at idle only. I stuck it in neutral one time and that fixed it while i was at the light.

Let me know if it fixes your problem though.

Quote:

Originally Posted by Disco Mike

Might want to send me your number and I'll call you, see what might be wrong.

will be sending you my number in a few minutes. You helped me with the head gasket with a phone call and I much appreciated that help!!!

Maximummd · 12-06-2012, 11:26 AM

*meant NOT to slowly die.

Also just figure I would through everything out. I was going to take the family to go get a christmas tree and was taking the rover. Started her up and the air wouldn't come on. Neither would the wiper blades work!! both were working the night before just fine. Turned the car off and started it back up and they worked no problem. On the way home from getting the tree same thing! Neither the wiper blades or air worked. No power what ever. Just drove home. next morning both just fine. Since then no problem?!

Anyone know's what gives here? Figured it wasn't a fuse...

jhdylan · 12-07-2012, 02:43 PM

Okay so replaced the Coil Packs today so far no codes Truck runs GREAT... only code was a p0413 due to me not fully connecting the main plug for the SAI switch. Real test will be tomorrow as I have 1 hour and 30 minute each way highway run to make. But if you are still having those misfire codes... I STRONGLY recomend having a look at replacing the Coils..

Scrubo · 12-11-2012, 05:23 AM

I had misfires from 3 and 4 before. I had new Bosch Platnium's in there and she didnt like it. So I switched them out with Champion Platnium's and now she runs better. I also have STI wires on them as well. Try those out, maybe they could help out some of the misfires?