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Old 09-04-2015, 10:32 AM   #1
Bigchad
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1998 frontier misfire po301 knock sensor

Hello guys and gals. I have a 1998 frontier 2.4 ltr. Just started misfire so here's a list of what I've done still misfireing. New plugs,wires,cap,rotor button, all new vacumn lines,new o2 sensors,new exhaust manifold and gaskets,new downpipe. Checked compression test all checking 165 psi,checked spark with tester all good. Checked injectors all have 8.5 ohms and noid light shows good on wire connectors. Please let me know if anyone has any suggestions. Thanks for reading.
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Old 09-04-2015, 02:12 PM   #2
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Re: 1998 frontier misfire po301 knock sensor

The ignition coil is inside the distributor. If the coil is breaking down then you'll have to replace the whole distributor. They'll usually work ok when the engine is cold but start to misfire as the engine warms up. Last one I replaced was about $120 aftermarket (Cardone). You can go "bone yard" but who knows how long they'll last. Not an uncommon problem on Nissan 4's and sixes.
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Old 09-04-2015, 02:19 PM   #3
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Re: 1998 frontier misfire po301 knock sensor

Will this make misfire even when it's cold engine. I start it and it runs really rough and after five minutes of running it starts to miss worse and then dies. It will restart and do the same thing. When I replaced plugs number 1 was fouled. After fifteen minutes of running I pulled all plugs again and all were fouled. I changed again from nkg this time with AC delco and still has misfire.
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Old 09-04-2015, 02:44 PM   #4
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Re: 1998 frontier misfire po301 knock sensor

Let me start over. I thought I saw P0300. Is that the only code you're getting? P0301 is a misfire code for cylinder #1. The NGK plugs are more suited to that engine than the AC's. Where did you get knock sensor?
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Old 09-04-2015, 02:56 PM   #5
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Re: 1998 frontier misfire po301 knock sensor

It came up knock sensor code but I was told it would with cylinder misfire. I've also been told egr valve clogged is this possible
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Old 09-04-2015, 03:16 PM   #6
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Re: 1998 frontier misfire po301 knock sensor

I know there's a common problem with most early 3.3's with knock sensor codes but it mostly pertains to relocating the sensor and doesn't cause a misfire. Not sure if it affects 2.4's. Have you checked fuel pressure? And all the injector resistances are the same? (unlikely but the offender will be way off the other 3).
Recheck all your work then try this for help: troubleshootmyvehicle.com › Nissan › 2.4L, 2.5L
The guys got a pretty good trouble shooting tree with logic you'll understand.
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Old 09-04-2015, 03:16 PM   #7
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Re: 1998 frontier misfire po301 knock sensor

if you can, use a volt/ohm meter and see if injector for #1 has resistance, compare it to one of the other ones. will need to unplug the wire from it to check it
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Old 09-04-2015, 03:23 PM   #8
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Re: 1998 frontier misfire po301 knock sensor

I unplugged all the injectors and did ohms reading all four are reading 8.5 ohms. Noid light showed all wiring is working properly. Was told that egr valve passage could be clogged up. Is this possible even at cold motor. I just even bought another cap and button to double check and still misfireing bad.
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Old 09-04-2015, 03:26 PM   #9
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Re: 1998 frontier misfire po301 knock sensor

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Old 09-04-2015, 03:29 PM   #10
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Re: 1998 frontier misfire po301 knock sensor

What's there an echo on this website?
I would think an EGR issue would affect all cylinders the same.
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Old 09-04-2015, 03:35 PM   #11
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Re: 1998 frontier misfire po301 knock sensor

Ok I am going to retest engine light codes and see if it is all that the com is throwing. I will look at the website posted and see if it helps. Thanks again for all your help Guy's.
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Old 09-04-2015, 03:37 PM   #12
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Re: 1998 frontier misfire po301 knock sensor

and unless egr valve is stuck it should not be open while engine is cold. this is the correct link to pages to trouble shoot p0301

http://troubleshootmyvehicle.com/nis...isfire-codes-1
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