1.8 not firing

Asked by Apr 15, 2017 at 09:54 PM

Question type: Maintenance & Repair

2002 Nissan Sentra GXE 1.8 only firing on #1

15 Answers


Should check the engine compression. May have low compression.

Compression Good 150 on all cylinders. Also changed crank and cam sensors.

When I said firing on one cylinder, I mean that's the only spark plug that is sparking when removed and grounded. I also checked sensors with volt meter and wire piercing probe while turning crank by hand...all checked ok.


I'm thinking you need to have the coils tested. That can be done at a auto parts store. I assume the spark plugs are good. Have you checked to see if there is power to the coils?

I swapped coil packs with #1 and all worked as they should. How do I check for voltage at the other three coil packs? Also All fuses under dash and under hood checked good.


With a digital multi meter, start by checking number 1 with the key in the on position to pick up voltage so you know what your looking at.

I checked and yes there is 12 volts going to all coils. Plugs seem to be ok, like I said before plugs and coils all worked on #1.


The only thing I see that it could be would be the camshaft sensor or the crankshaft sensor. I will be back later. Easter stuff.

Sensors were changed. Also checked them with meter.. everything good. Thanks in advance for your help!


Good morning LQ2B, I have found this..." Check for power to the ecm relay. The relay is located behind the glove box. Take the box out and you ned to find the relay with 2 white wires with a blue stripe going to it. Check them for power with the key on. If there is no power,then the wire is broken. The wire usually breaks out by the battery. If you look on the inner fender on the drivers side, the wire runs there and then under the battery. It is the same color all the way. Once you find it under the battery, give it a pull and you will like find the break. At that point either repair that wire, or connect that wire to a wire that has power with the key on. This should bring the check engine light back on. If it does then the car will probably start."


Or replace the relay. Everything I read so far is pointing to this area.

I will try all that you suggested and get back with you later this evening.


Sounds good...

12 volts at Relay ..all checked good. I tryed cranking motor again and you guessed it ...started. So now car runs good but very very hard to start, two codes 1). Po335..crank sensor. 2). Po113 ..intake air temperature sensor high. Any thoughts?


P0335 NISSAN - Crankshaft Position Sensor Circuit...Possible causes; Faulty crankshaft position sensor, Crankshaft position sensor harness is open or shorted, Crankshaft position sensor circuit poor electrical connection, Signal plate may be damage, Starter motor may be faulty, Starting system circuit, Dead or weak battery...Sometimes and in some models, low battery voltage or a weak starter can can trigger a Crankshaft Position Sensor code. Before replacing any parts, recharge or replace the battery......The po113, clean the Mass Air Flow Sensor with MAF spray cleaner, and change the air filter if necessary.

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