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Discussion Starter · #1 ·
Hi There!
I have a 1998 Frontier SE 2.4l SE Automatic. It's a 98, not an 89. I messed up in the title. I'm having an intermittent issue with it bogging down on me. Let me start by saying that I do currently have the Instrument Panel issue that's supposedly common with these trucks (Completely dead- Fuel gauge pegged on full, etc..) but I doubt that's part of this problem as I've been driving it like that for several months before the bog issue started.

I'll be driving along, usually for quite a while 30-45 minutes around town when suddenly it'll just lose power. If I pull over and try to rev it, it will only rev a little bit (no tach) then bog heavily. If I turn the truck off and restart it, it will often go back to normal driving conditions for a while. A previous forum said it was likely the O2 sensor so I changed that but it didn't fix it. A friend who had the same issue on his Frontier years ago said to change the Knock Sensor. The ones at the parts store were $100 but on Ebay I could get them for $6 so I ordered two, just in case. I replaced it (bugger bear of a job as you have to remove the throttle body to get to it) and it seemed to be ok for about a week. Something told me to get off the highway and sure enough, moments later it happened again. I put the spare Knock Sensor on and re-positioned it to the intake manifold this time in case I have to do it again. I didn't get five miles down the road when it bogged down again.

Could it be something as simple as the fuel filter? Or did I get a bad knock sensor out of the box, do you think? Or perhaps one of the other sensors? Oh.. the code that it was throwing at first was "Coolant Sensor Circuit Failure". I replaced the coolant sensor but the code stayed. The check engine light went off on it's own after I changed out the first Knock Sensor, though. After the second failure, the code was, "Manufacturer Code Fault". When I put the new KS in, I reset the codes since it didn't automatically reset like last time, figuring I'd get a fresh go at it. No codes have popped up after this last failure, though. The check engine light hasn't come on, despite the bogging issue.

Sorry for the novel, I figured I'd try to get it all in on the first post. Any advice would be helpful. I'm planning on changing out the fuel filter today and another of the cheap KS's has come in so I might just put it on, too.

Many Thanks!
 

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Discussion Starter · #2 ·
Update on the Frontier: I changed the fuel filter today, finally. Whoever changed it before me installed the last one backwards. They had it flowing towards the tank rather than towards the engine. I'll drive it around a while with the new one installed correctly and see if that fixes the problem.
 

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Thanks for the update. I don't have any advice on your issue unfortunately, but I did fix the thread title for you ;)
 

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Discussion Starter · #4 · (Edited)
I took it on a test run today around the neighborhood and the same problem happened. It bogged down after a bit of driving. I turned it off and turned it back on and the problem went away so I was able to make it home. It's throwing the code, "Engine Coolant Temperature Sensor 1 Circuit". I'm going to swap the Knock Sensor one more time to try that out. The first time it was throwing that code and I changed the KS, the code went away on its own and I was able to drive it for several weeks. Maybe I just got a bad one.

If Anyone has experienced anything like this or has any advice, I sure would appreciate it. I'm grasping at straws, here.

Thanks for fixing the title!
 

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Discussion Starter · #5 ·
The new knock sensor seems to have helped, though the check engine light is still on. I'll be taking it in ever widening circles as the days go on so it doesn't burn me too far from "home", should it fail again. It's actually at a friend's house so I've got to build up the confidence in it to drive it back to home, proper, which is about 30 miles away. This could get interesting. I may reset the check engine light manually again. Advice is welcome!
 

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Discussion Starter · #6 ·
Nope. Not the knock sensor. It finally warmed up enough outside for me to want to take it round and round on a test drive. Sure enough, it failed again. Bogged down just like before. Acted like it was gas-starved. I pulled into a parking lot, turned it off and right back on and it worked just fine for the drive home. I'm really at my wit's end, here. Please give me some advice.
 

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Stop replacing knock sensors! They will not cause a drivability issue! They are only used to sense engine knock so the ECM can retard the ignition timing to help prevent engine damage. If there is an engine knock, it will trigger the knock sensor code, but, that doesn't mean that the knock sensor is bad, only that it is doing its job. It is possible that your problem is caused by the instrument cluster. First, you are still triggering a coolant sensor circuit despite replacing the sensor; this would indicate that the problem may lie in the circuit...and part of that circuit is in the instrument cluster. Also, vehicle speed sensor sends its signal to the instrument cluster, which, in turn relays info to the ECM and TCM. I would first refer the factory service manual for the harness ground locations and make sure they are all good (sometimes the ground bolts will loosen up or corrosion will cause a poor grounding condition. If that checks out okay, I would then send the cluster out for repair and see if you symptoms still exist when you get the repaired cluster installed.
 
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