Rough idle and running rich. - Nissan Forum
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post #1 of 35 Old Jul 10th, 2010, 07:48 PM Thread Starter
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Rough idle and running rich.

Hi all,

New hear and having some issues with a 97 Pickup I just bought. It is the 2.4l with a 5 speed.

It isnt running rough, but at idle it isnt smooth, it rattles the truck a bit. Also it smells like it is a little rich.

Plugs look good, wires are newish, and I am going to check timing. I cleaned the MAF as well.

I am getting a code that says P0175 System too Rich (Bank 2).

Any ideas. thanks

Other than that what do you guys think.
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post #2 of 35 Old Jul 10th, 2010, 08:38 PM Thread Starter
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Ok, the timing is fine, 10 degree's.

Forgot to add I am getting about 16 mpg as well. Thought these little pickups did better than that.
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post #3 of 35 Old Jul 10th, 2010, 08:56 PM
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i was told on mine which is a 97 hb 2.4 4x4 5 speed i would get no more then 14 mpg but only thing i could tell u is to mess with ur air fuel mixture screw cause mine was to lean but mine wouldnt run on its own and everyone will tell u check for vacuum leaks but seems to never be my problem but if i figure mine out i will let u know
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post #4 of 35 Old Jul 11th, 2010, 02:01 PM Thread Starter
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Well got an update, for those following along.

I went ahead and seafoamed it, man I didnt relize that it would smoke that much. But it seems to smooth some things out in the engine a little bit.

Also I changed out the cap, rotor, and spark plugs. The plugs looked absolutely horrendous. They were wet, very black and had some soot on a couple of them. I am guessing it burns some oil along with these plugs have not been changed in a very very long time. Also seemed to help with smoothing out the engine a bit.

Now for another possible problem. I think I might need to change the timing chain. It is rattling like non-other. I thought the rattle was from loose heat shielding but upon further inspection today under the hood it is coming from inside the engine in the area of the timing chain. Never heard an engine do this before, also never owned a nissan, so I am think chain after reading over other post on the topic.

If you guys got any input let me know. So the search continues.

Thanks

Brian
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post #5 of 35 Old Jul 11th, 2010, 03:17 PM
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was there no stored codes (mode 1)? cause i bet its the o2 sensor or theres something wrong with injectors. if theres no codes for any sensors maybe just try some fuel injector cleaner.
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post #6 of 35 Old Jul 11th, 2010, 03:21 PM Thread Starter
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No codes for the o2 sensor, but was think about replacing them later on just to see. I put some cleaner in the gas tank today so hopefully it will clear things up.
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post #7 of 35 Old Jul 11th, 2010, 11:19 PM Thread Starter
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Another update. Just noticed this when I got home tonight. When i came to a stop tonight the truck will surge rmp's at idle, surge's from 700 to 1000. Any way I will try to track this down as well. Thanks

Brian
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post #8 of 35 Old Jul 12th, 2010, 03:06 AM
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What do running rich means? Sorry, i really don't know.

You are the only exception...
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post #9 of 35 Old Jul 12th, 2010, 09:56 AM Thread Starter
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Means it is getting more fuel that the engine needs, the exhaust smells really heavily of fuel.
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post #10 of 35 Old Jul 12th, 2010, 11:17 AM
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the truck has OBDII system so it will store codes if there were any. check the charcoal canister and lines to it. its above the spare tire under the bed.

Dave
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post #11 of 35 Old Jul 12th, 2010, 11:26 AM Thread Starter
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Quote:
Originally Posted by kd7skx View Post

I am getting a code that says P0175 System too Rich (Bank 2).
From above. Thanks
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post #12 of 35 Old Jul 12th, 2010, 10:19 PM
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Quote:
Originally Posted by kd7skx View Post
Another update. Just noticed this when I got home tonight. When i came to a stop tonight the truck will surge rmp's at idle, surge's from 700 to 1000. Any way I will try to track this down as well. Thanks

Brian
My truck has been doing this as well, it is a 1987 HB 4x4 with the v6 motor and 5 speed transmission. It was getting really bad and then it got better when I changed the idle speed and moved the distributor cap a couple degrees, but it is starting to act up again, very inconsistent times to...

I looked for vacuum leaks and none, so I do not know what is going on here. Hopefully someone can help our problem here. I also notice, on my oil gauge that when my truck surges it will go from a good idle, around 16 when warm, to like 6, then catches itself and shoots it up for around 25, then back down to low pressure... very strange, also seems to do it more when running in reverse, which doesn't make sense... didn't do it today though. Going to get some injector cleaner though and run it through my tank since I need to fuel up... sub gauge is at 1/16 -.- Lol.
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post #13 of 35 Old Jul 13th, 2010, 02:01 AM
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PCV valve, or valve cover gaskets.

Quote:
Originally Posted by BBDirtbiking View Post
My truck has been doing this as well, it is a 1987 HB 4x4 with the v6 motor and 5 speed transmission. It was getting really bad and then it got better when I changed the idle speed and moved the distributor cap a couple degrees, but it is starting to act up again, very inconsistent times to...

I looked for vacuum leaks and none, so I do not know what is going on here. Hopefully someone can help our problem here. I also notice, on my oil gauge that when my truck surges it will go from a good idle, around 16 when warm, to like 6, then catches itself and shoots it up for around 25, then back down to low pressure... very strange, also seems to do it more when running in reverse, which doesn't make sense... didn't do it today though. Going to get some injector cleaner though and run it through my tank since I need to fuel up... sub gauge is at 1/16 -.- Lol.
With that type of oil pressure surge, you could check your valve cover gaskets, or you pcv valve, air getting in thru your gaskets will cause the pressure to fluctuate....PCV may be in need of replacing.
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post #14 of 35 Old Jul 13th, 2010, 02:58 AM
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Quote:
Originally Posted by GeoBMX4Life View Post
With that type of oil pressure surge, you could check your valve cover gaskets, or you pcv valve, air getting in thru your gaskets will cause the pressure to fluctuate....PCV may be in need of replacing.
It is more of a surge of my oil pressure related to idle, like when my truck is just idling (note: Doesn't happen always, seems to be better after adjusting idle and distributor cap) I give it a little bit of throttle and it gets up all right, but when it drops back down it drops low, then it catches itself, at the point where it is lowest the oil pressure would be the lowest. After it catches itself, it shoots over my normal idle speed, then drops back down low, and same thing happens... Some times it does this quite a lot and frequently, which is what is confusing, if it did it all the time I wouldn't be as confused. If I have time I will check the PCV valve tomorrow, thinking about it now, that could be the culprit although I always did oil changes well before recommended mileage... I will have to check it out, thanks for that suggestion.
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post #15 of 35 Old Jul 14th, 2010, 10:34 PM Thread Starter
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So I bought a code reader and ran the code again. It is p-0171 now instead of p-0174 earlier.
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