Cam retard has been checked had it in a shop after I did the distributor he tried to do a relearn on crank sensor and wouldn't work until he adjusted the distributor. Then took it to a different shop after that didnt fix it and they also did a relearn on it and he said the same thing it shouldn't even relearn if it is throwing the P0300.

Will have it rechecked though when I can get it in or get my hands on a decent scanner. Will also be checking FP and such mentioned above.

Again thanks for all the replys.

 

Your positive fuel trims (ST plus LT on a given bank) indicate the ecm is adding fuel to correct a lean or perceived lean condition. If perceived you have a sensor problem (o2, ECT, MAF, etc). If real you have a lean condition that can be caused by air leaking after the MAF, plugged injectors, insufficient fuel pressure, etc. You should follow the instructions above to finish the fuel pressure tests but your trims are not balanced across the banks so you probably have another issue. Injector spray volume can be measured with a balance test using a pulse teste and fuel pressure gauge. Most just replace if suspect. Air after the MAF is probably not a vacuum leak since the trims should get better at higher rpms as the fixed rate leak goes down in impact but you have the opposite. Every sensor can be tested or at least monitored with live data to see if they are wonky. Think ECT, o2, map, BARO ... O2 sensors can be tested but it’s a little involved. You can always just swap banks to see if the issue follows.

George

 

Long term fuel trim on a given bank is merely a longer term average of trim which is the departure from the table look up fuel delivery value for a brand new engine under that set of calculated and sensor conditions. Short term is the momentary departure from the long term average so the present trim or departure from ideal fuel delivery is the addition of the two numbers. Let’s say that you have an intermittent weak fuel pump or injector that’s is usually weak. Fuel delivery will suffer most of the time, the mix is usually lean and the system starts adding fuel (with longer fuel delivery pulses) to compensate. But at this moment fuel delivery is normal. The LT trim has a semi permanent add to the fuel delivery pulse width but it is not required on this day for this moment in time so in short term the correction is removed and the overall trim would be close to zero. The fuel delivery is constantly being adjusted so that the air fuel mpicture is the ideal 14:1 as determined by the O2 sensors. The first priority is always minimal emissions and 14:1 does that.

George