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Old 09-07-2015, 08:30 PM   #1 (permalink)
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Default p0300 p0302 p0303

I bought an 08 Forenza last winter, 10 months ago a rod broke and cracked the block. I replaced the engine with a salvage engine from an 05 reno. I used my original sensors and accessories from my 08. Replaced timing belt(dayco), water pump and basic fluid changes. The engine started and ran fine until 65mph, then I get a flashing MIL and codes p0300 0302 and 0303. However I don't feel a miss or any loss of power. The plugs, coil and plug wires are new (were installed on damaged engine less than 5k ago). I replaced the plugs anyway, even though no damage was evident. I have swapped the injectors with 4 spares, changed the crank sensor, cam sensor, map sensor.

2 months ago I replaced the head gasket, coolant system over pressurized, and coolant in the #4 cylinder. I replaced it, along with the timing belt(gates) and tensioner. Compression is 1 150, 2 155, 3 145, 4 150.
Yes, I know I should have done this when I installed the engine, however I was pressed for time.

The o2 sensors seem to be switching fine on live data when creating a lean or rich condition. I have 52psi of fuel pressure(on rail) at idle and 20 inches of vacuum.

If I keep it under 60mph I never see a code, but from observation 65-70mph takes about 15 miles to flash, 75mph takes less than 10 miles.

I have live data of drives with no code and a couple of when the misfire occurs if this would help.

I'm sure that I'm overlooking something simple and any help would be appreciated.
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Old 09-21-2015, 10:17 PM   #2 (permalink)
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Started getting U0100 two weeks ago. I replaced the ECU and the misfire codes have not come back. Hopefully this helps someone.
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Old 12-10-2015, 10:07 PM   #3 (permalink)
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Well im glad to see im not the only one with the same problem.I also had P0300,P0302 and P0303 Codes.I changed spark plugs,wires,coil pack,catalytic converter,o2 sensors,map,intake and exhaust gaskets,swapped injectors,pressure tested fuel rail,change timebelt,cam sensor..but nothing so i swapped ECU then they disappeared but now they are back under hard acceleration..ive done everything to try to fix it..My guess is that the ecu houses the coil ignition MODULE (within) which probably goes bad overtime.
So i guess i need to get another ecu again!!

Last edited by Optimistic; 12-10-2015 at 10:18 PM.
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Old 12-24-2015, 09:17 PM   #4 (permalink)
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Default Time belt idler pulleys

When there bearings start to fail they cause the time belt to wobble at different engine rpms..i had to learn the hard way p0300..p0302..p0303..then pulley broke causing time belt to slip and all my valves to bend..its a common occurance most forenzas and renos at my local pick part junk yards died this way.
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