The ones you found are for the 2000 and up Neons, he is talking about a '95 Neon and they have different mounts. They use to have the Rex inserts for the first gen Neons, but they are no longer listed on their site.

 

Bad O2 sensors are not a direct cause of the misfire. Yes they probably aren't helping the fact but there might be something else wrong. Maybe the timing belt is off a tooth? Spark plug wires need to be replaced? How about a bad fuel injector or two. I had an injector go out on one of my altimas and it acted just like that. Just because you got an o2 sensor code dosen't always mean that the o2 sensor is bad. It just means that the o2 sensor is seeing something that its not supposed to. Your best bet is to takr your car to a shop that can do a full run diagnostics check on it. They should be able to give you a lot better idea whats wrong with it. It sucks haveing to take your car to a shop but sometimes you just have to do it.

 

It may not be in direct relation to it but he's not throwing any codes. And on top of that a fouled injector or plug could be caused by the cars running rich due to a bad O2 sensor. 9 times out of 10 when a Neon throws an O2 code it is in fact the O2 sensor. If his timing was off it would throw a code 11, which it is not. So, the running rich is in escence caused most likely by the O2 sensor.


CODE Description of Trouble Code
11 Timing belt skipped 1 tooth or more from initial learned value, Intermittent loss of either camshaft or crankshaft position sensor, No crank reference signal detected during engine cranking
12 Direct battery input to PCM was disconnected within the last 50 key-on cycles
13 No change in MAP from start to run
14 MAP sensor voltage too low
15 No vehicle speed sensor signal
17 Closed loop temp not reached or engine cold too long
21 02s sensor problem (oxygen sensor), upstream or down stream
22 Engine coolant temp sensor out of range
23 Intake air temp sensor out of range
24 Throttle Position sensor out of range
25 Idle air control motor circuits, target idle not reached (+/- 200),vacuum leak found
27 Injector control circuit
31 Evap purge flow monitor failure or evap solenoid circuit
32 EGR system failure
33 A/C clutch relay circuit
34 Speed control Solenoid circuits
35 Rad Fan control relay circuit
37 Torque converter clutch solenoid CKT or park/neutral switch failure
41 Generator field not switching properly
42 Fuel pump relay control ckt, Auto shutdown relay control ckt, No ASD relay output voltage at PCM, Fuel level sending unit volts out of range, Fuel level unit No change over miles
43 Multiple/ single cylinder misfire
44 Battery temp sensor volts out of range
46 Charging system voltage too low
51 Fuel system lean
52 Fuel system rich
53 Internal control failure
54 No Cam signal at PCM
55 End of error messages (If you get this only, no errors were found)
62 PCM failure SRI mile not stored
63 PCM Failure EEPROM write denied
64 Catalytic Converter Efficiency Failure
65 Power steering switch failure

 

There is no code for bad fuel injector the only thing that is close is:
27 Injector control circuit
But that only tells you if the injector is doing something wrong electricly it doesn't say if it is spraying right or not. Most of the time a bad injector will throw that code. But sometimes like my car did they will just not spray but won't throw a code at all. A bad o2 sensor cannot foul up an injector, spark plugs yes, but it takes dirt and grim to plug an injector not just more fuel. Although if it is spraying more fuel it is at a very slightly higher risk of getting clogged.

 

It would only throw code 11 if the belt was put on and then skipped a tooth but if it was put on, off a tooth a lot of times it won't throw a code. I work at a parts store Believe me I have see a lot of weird **** happen sometimes just because the computer says there is no problem doesn't mean their isn't a problem.

 

I don't know how familiar with Neons you are but, I've been around these cars quite a long time and the upstream O2 sensor does talk to the computer and delegates how much fuel is added into the engine. If the O2 sensor is seeing something different it's either going to tell the computer to add more fuel or not enough fuel to try and corect the problem.

If it's running rich and adding more fuel then it's going to dump fuel into the cylinder that the engine can not use. What happens is it's going to clog the injector, foul the plugs and ruin the cat. Of course this takes quite a bit of time.

 

Thats the same setup as any electronic fuel injected vehicle. But you would have to fill up the intake manifold with fuel before you clogged the fuel injector from running rich, which seems to to be down right impossible.

 

It's not, the injecotrs on a Neon are at the very top of the intake runners. The tops of the runners are pitched down into the cylinders, well not quite but you get the drift. They are pitched down to the intake valves so what happens when running rich is the fuel pools at the ends of the runners which happen to be where the nose's of the injectors are. So they do get clogged quite easily. I wish I had my 24lb. injectors here so I could grab one of my spare manifolds and show youm but I haven't ordered the injectors yet.