I NEED HELP. I am leaving on a trip and I am beyond confused. I have codes come up 1300 304 & 308. I have so far changed the wires(sti), spark plugs(denso iridium), ran a fuel dinrail injector cleaner, replaced the the head gasket and new fuel pump. We measured the resistance in the coil and it seems ok. I have not changed any of the coils or injectors. I have been dealing with this for months and can get no consistency. I can go 200+ miles with no codes and then it appears. It is amazing after doing all these things I have lots of power and can't even tell when it missfires other than the code. The odd thing is the history of the codes are misfire in 4 and 6 then it was just 4 and now it is 4 and 8. It seems to me this could be a camshaft sensor, coil or injector or maybe an O2 sensor. The valves were replaced with the head gasket. I have brought this to at least some of the highest rated mechanics in Portland OR but no avail. Should I just replace these items or BLOW IT UP and call it good.

 

Replace the crank shaft position sensor.
There is a write up on how to do it on the top of the page.

 

Spike, the crank sensor has nothing to do with a misfire, it is a hot start sensor only with no grey area.

As for the actual issue, how many miles on the truck? I would consider doing a compression test if this is a high miler truck, run a can of 44K thru the tank and keep an eye on the coil as a possible problem.

 

Actually it can Mike, we have had several people on here with a random mis fire that was cured with a new crank sensor.
It is a cheap and easy thing to rule out since his plugs and wires are all new.
Remember that the crank sensor controls spark and while the #1 symptom is a stalling when hot or a no start when hot it can also send weird spark signals.

 

Thanks for both of your inputs. To clarify the car has 109000 on it. The problem is the issue is not consistent. I can not get the car to repeat the code. I will do a compression test to verify but I was wondering if being on the same bank would have anything to do with it and that is why I was wondering if it could be an O2 sensor. Where is the link for the camshaft sensor. I have replaced so many parts already another one won't hurt.

 

A bad O2 will not cause a mis fire code.
In the write up section on the top of the DII page is a write up on how to replace the crank shaft sensor NOT the cam sensor.
The crank sensor is about $60 at AutoZone, the cam sensor is about $300.
Replace that one if you want to but I wouldnt, I would replace the crank sensor.

https://landroverforums.com/forum/di...t-reads-26352/

 

Thanks. I did mean crankshaft. It looks pretty simple and it looks like other people had have some pretty good luck not using the T5

 

Those people were completley wrong.
Think about it, all the crank sensor does is send a signal to the ECU that then fires the coils and fuel pump. It can not in any way be selective and cause a misfire, trust me on this, I am not wrong.

 

Straight from rave:

"It is vital that the correct air gap is maintained, if the air gap becomes too wide the CKP signal becomes too weak, causing possible engine misfires to occur."

I would think that a bad crank sensor might have too weak of a signal, and have symptoms similar to an air gap that is too large.

Here are the symptoms from RAVE about a failing sensor:

"In the event of a CKP sensor signal failure any of the following symptoms may be observed:
l Engine cranks but fails to start.
l MIL remains on at all times.
l Engine misfires (CKP sensor incorrectly fitted).
l Engine runs roughly or even stalls (CKP sensor incorrectly fitted).
l Tachometer fails to work.
l Flywheel adaption reset – ferrous contamination"

 

You stated that the heads were rebuilt. Were the exhaust guides replaced or trimmed?