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Old 04-07-2021, 10:03 PM   #11
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Quote:
Originally Posted by 89'HBV6 View Post
We have another member with a similar problem. Runs crappy when warm.

Wyo_Guy ...have you ever replaced ALL your vacuum lines? Think about what can happen when old rubber get warm and has holes... May want to check this thread. Look at post #5: http://www.infamousnissan.com/forum/...579#post547579
All vacuum lines and coolant lines replaced this past August when one of the small coolant lines under the upper intake started leaking.

Thank you for the link to the other thread. I will start reading that one next.

How does the ECM handle trouble codes? Does it record a code if the temp sensor is showing temperatures outside of normal operation temps? Or does it only record a code if the sensor is no longer functioning? My ECM doesn't currently show a temp sensor code. Does that mean my temp sensor is good?

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Old 04-07-2021, 10:20 PM   #12
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It will store the code until cleared.

...or at least that's what the manual says.
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Old 04-07-2021, 10:23 PM   #13
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Originally Posted by jp2code View Post
It will store the code until cleared.

...or at least that's what the manual says.
Question: What if the problem comes and goes? Will the code clear, if the ECU sees the item, that threw the code, clean again? Or is this new thinking and these are really dumb ECU's?
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What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.

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Old 04-07-2021, 10:42 PM   #14
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I'm not sure if it is smart enough to figure out what is outside range like a new vehicle. My car will say "implausible signal" but I think the D21 can only tell if it there or not. Might be worth checking it with a meter. I have a friend that had cold issues and ended up finding his temp sensor (on his honda) was telling the car it was 200F when it had just been started on a 35F morning and something like 400F when it was up to temp.
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Old 04-14-2021, 02:48 AM   #15
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FIXED!!!!

We went ahead and checked the fuel pressure and it was spot on. We tested it with the engine hot and cold, both were fine. The coolant temp sensor was very close to spec and the resistance went up and down as it should with engine temp. The MAF sensor was spot on per the FSM.

I happened to notice a tick or clicking sound when I would raise the rpm's just above idle which is where you could really get the motor to stumble and fall on its face. The click sounded like a spark. It was just before dark so I replaced the fuel filter and rubber high pressure fuel line waiting for the sun to set. Once it was good and dark, I warmed the motor back up and got it to stumble again. I turned off all the barn lights and started looking where I could hear the clicking and sure enough, I could see some flashing of a spark leaking out of the #2 plug wire. It was WAY down at the end of the plug wire boot. I grabbed a 20 year old plug wire off the parts truck and she fired up and idled smooth as a sewing machine. After a couple test drives, to verify it was good and no new trouble codes, we called it a success. The Carquest premium plug wires are 22 months old and already failing. Good news is they said they would warranty all 6 plug wires.

THANK YOU ALL for the help walking through this kinda odd issue. It runs great after this deep tune up!!
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Old 04-14-2021, 01:07 PM   #16
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Thatll do it!





Also, NGK is recommended for all things spark related in these trucks. Most of us only run NGK plugs and wires.
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