I have a code scanner i can do that with. What should the fuel trim readings be?

I will check all the ground wires. I did replace the coil packs since the problem started so it can't be them. The spark plugs looked healthy too at the time, but maybe i should check them again.

Would a spark issue only be a problem on cold start?

Sorry i must sound naive but how would i go about this. Any details would really help.

 

Ideally fuel trims should be zero. The long and short term fuel trims tell you how much the fuel the ECU has to pull or add to make stoich (14.7) in closed loop mode. If you see large numbers, it just means the ECU is making large compensation to the ideal fueling number in order to get the mixture it's trying to get to. Short term is just what it say, adjustements over a short time span. Long term is how much fuel it's learned it's had to add or subtract.

If you have low oil pressure when you start to the timing chain tensioner isn't tensioning and then the oil pressure build as it warms. I'm thinking something oddball like that.


The cam and TDC sensors are sending pulses to the ECU. It uses these pulses to determine RPM's and when to fire the spark plugs among other things. I was suggesting looking as the patterns on an oscilloscope to see if the patterns look different hot versus cold.

 

great, thanks for all of the advice.

So next, i will:

1. Check spark plug gaps with feeler gauges
2. Check all of the engine bay ground points are clean
3. Hook up code scanner and check fuel trims
4. Fit an oil pressure gauge and check pressure
5. Fit a fuel pressure gauge (don't know where i will find one of these)
6. See if i can get an oscilloscope to monitor crank and cam pulser signals

 

Data Streaming reads:

Spark Advance: 20
Short Term Fuel Trim 0
Long Term Fuel Trim 0

 

i just took my spark plugs out and they are all gapped wrong a 0.0275 instead of 0.045. They are quite black and they were soaking wet with fuel when i took them out. The fuel evaporated off in a min or so once they were out. I hadn't tried to start the car for at least 3 hrs before removing them.

The spark plugs are Denso Iridium vk22. Should they be Denso Iridium ik24?

What do you think. Could this be the problem?

 

What is the clicking noise all about? I would fix that first.

 

the clicking only happens when the problem occurs on cold start. I have allways assumed its the timing chain clicking from lean to rich etc. I know it is all part of the same problem.

I just re gapped the plugs to 0.045" and put them back in. The engine did start smoother and when i blipped the throttle a puff of black smoke came out and then it ran really nicely. I'll see tomorrow if the situation has improved on cold start.

 

Any updates. I haven't checked into s2ki in awhile. My p1259 error had nothing to do with fuel and it shouldn't. Its usually only an issue with oil pressure above 6k rpms

 

I have just bought an oil pressure gauge for the car to check the oil pressure situation out.

I have also bought new spark plugs for the car because the wrong ones were fitted. I'll get a chance to fit both this weekend with a bit of luck. I'm hoping there isn't an oil pressure issue for obvious reasons, but i'm betting that there probably is, because thats what the P1259 means.

My P1259 came on on both occasions at idle just after the car was started and way under 6k rpm

 

Drop the oil pan and check the pump, last thing left basically.