I have a 2003 Nissan Altima 2.5L with multiple problems . No i dont still drive this car , but i’ve been thinking about getting it fixed . so here are my problems.
1. No heat at idle or when driving at low speeds - i’ve already tried flushing and “burping” the cooling system . i’ve also changed my thermostats 2 times .
2. Rough idle and sometimes my car shuts completely off at idle (like when i stop at a red light) , and also hesitates / jerk when i try to go faster. I have codes for upstream and downstream oxygen sensors but I have already changed them and I continue to have the same problem .
3. Oil light comes off and on repeatedly. i have already changed my oil and oil filter and continue to have the same problem.
Dunno if you got it fixed or not yet. I had those same issues. My car sat for about 7 years when I joined the military. I recently got home and the other half wrecked her car a week after paying it off. We didn't want another car note so I gave her my car to drive and started fixing up the 03 Altima. You already did both O2 sensors. I'd recommend looking into your crankshaft and camshaft position sensors and your motor mounts. If you live somewhere that doesn't do inspections cut your catalytic converter out and go straight pipe (your CEL will be on unless u put adapters on to fool the ECM) Keep your resonator and muffler so your car doesn't sound stupid like an Accord lol. Hope that helps. lemme know what you did with your car...
I have a 2003 Nissan Altima 2.5L with multiple problems . No i dont still drive this car , but i’ve been thinking about getting it fixed . so here are my problems.
1. No heat at idle or when driving at low speeds - i’ve already tried flushing and “burping” the cooling system . i’ve also changed my thermostats 2 times .
2. Rough idle and sometimes my car shuts completely off at idle (like when i stop at a red light) , and also hesitates / jerk when i try to go faster. I have codes for upstream and downstream oxygen sensors but I have already changed them and I continue to have the same problem .
3. Oil light comes off and on repeatedly. i have already changed my oil and oil filter and continue to have the same problem.
1. - After the engine is fully warmed up, feel the heater inlet and outlet hoses; they both should be hot. If not, the heater core may be plugged up; you can try doing a back flush. If they both are hot, then the AC/heater box air intake door motor may not be operating.
2. - One or more spark plugs may be fouled up.
A common problem with random engine shutdowns is a marginal camshaft position sensor or a marginal crankshaft position sensor. Most of the time when this happens, the "check engine light" never comes on; subsequently when performing an ECU code readout, there was no fault code set. There's been many members here on the forum that have had problems similar to yours and the fix was replacing those two sensors.
The best and cheapest fix for this situation is to replace both sensors at the same time; the reason for doing this is there is no way to determine which sensor is at fault with this type of condition. You can take your vehicle to a dealer/repair shop and they'll tell you there is nothing wrong after they go through with diagnostic tests because at that time the vehicle was running OK. You could end up spending $200 or much more depending on how much time/parts are used.
When replacing sensors, always use Nissan OEM parts from a Nissan dealer; aftermarket electronic items generally are not reliable, don't last long, and many times are DOA. The sensors are not very expensive; around $75.
3. - The oil pressure sensor on the engine block may be marginal or you have low oil pressure which could be caused by several factors. Worn rod/main bearings. Plugged up oil filter. Dirty oil pickup. Most of the time it's the oil pump which may be worn and not producing the proper oil pressure/volume.
You can check the pressure very easily by installing a temporary mechanical oil pressure gauge. You would remove the oil sensor which is located next to the oil filter and install the mechanical oil pressure gauge in it's place; you may need to get an 1/8 BSPT to 1/8 NPT adapter to hook up the gauge.
With the engine fully warmed up, the pressure should be as follows:
idle - at least 14 psi
2000 RPM - 43 psi
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