intake air control valve?

i have some carburetor cleaner.

No, they make a specific cleaner for the MAF. Don't use carb cleaner or anything like brake cleaner. Use the cleaner specific for a MAF. The chemicals in carburetor cleaner and others can damage the sensor.

Joe

Okay.

I bought some MAF sensor cleaner and sprayed some on the sensor today. I sprayed some on it let it sit for a little while and sprayed some more. Yesterday it was flooding so bad it would not run on its own. Today is different,it has been running on its own but not sure how long that will last.I will drive it tonight to see how it runs. I received the new IACV but it's raining so it will not be put on right away maybe in the next few days it will be installed.

Interesting. Just the idea that there is a change makes the concept more realistic. Let me know if it continues. You may have found the problem.

Joe

It tried to quit tonight but I pressed gas pedal, it's still missing a little bit.
I sprayed the MAF while it was still in the throttle body, I was thinking there still might be some spray in there causing it to read wrong, not sure on that but I will try it out again tomorrow. There are 2 small black wires that's on the bottom of a connector on the back side of the plugin, 2 plugins close together )that the IACV is plugged into. do you know what those 2 very small wires are for, if you need me to, I can take a picture of them and send to you. they come off the bottom of the connector and go towards the back and top of the engine? This plug in is closer to the firewall towards the back of motor.

Hi,

That's a tough one from here. Can you see where they appear to lead to? Also, a picture may help.

Let me know.
Joe

If you're looking at the throttle body from in front of the truck you will see the IACV plugin across and to the right of throttle body behind it is another plugin connector that has 2 small black wires that are on the bottom part of the plug in and they go to the back side of the motor behind the throttle body in the top part of the motor . Can I send pictures on here ?

Hi,

Yes, you can upload a picture. As far as the wire's, are you sure they are black? The only thing I can think of in that area is the EVAP purge control solenoid.

They are black or a dark color.

Those 2 black wires goes to the EGR .The new IACV was installed today along with a throttle body bottom gasket and I've have test driven it. everything seems alright for now. will find out later tonight. I'll let you know on how's it's doing. Thanks

Joe, it's still wanting to flood out, do you have any ideas ? I was thinking these after market IACV aren't what we might think they are. I'm thinking about ordering an Hitachi IACV one from someone else online. Give me your thoughts. Thank you

I personally don't like using inexpensive aftermarket parts. There are, however, specific brands I do trust. When you say it feels like it is flooding, is there every an excessive fuel smell that would indicate that as a possibility?

Joe

yes.

Out in the front of my air filter cover the bottom was wet today like it had spit some gas out through it on the bottom part in the mouth of the air filter cover.

I'm going to change distributor cap and see what happens.

Fuel pressure is within spec, correct?

Joe

yes, 34 psi, then it goes up to around 40 or so when engine is off.

I've got a fuel pressure gauge attached to it presently under the hood, I made a t fitting for it about 1 year ago for things like this happening.

At idle it's showing 34 psi, I cannot check it while driving.

That sounds right. It could have kicked some fuel back through if it was stalling. At this point, I'm not too concerned about that.

Joe

I'm still thinking it's the air control valve not functioning properly .

I drove the truck today and it's still not right. I parked it and in a few minutes tried to start it right back up and it was flooding out real bad, took a stick and hit the IACV lightly then started it up but it's still not running correctly.I believe it's the IACV or the wiring related to the IACV. What are your thoughts ? Any thoughts are better than no thoughts, lol.

If tapping on the unit allowed it to start, I would say there is a good chance.

Joe

I drove the truck tonight and it tried to quit a few times,I patted the gas to keep it going. I monitored the engine and the MAF was.64-.69 the temperature rose to 183 deg. the o2 sensors were in the range of 1-1 .
I am thinking about ordering a Hittachi IACV . I also checked when the engine was attempting to die was the fuel pressure dropping & it wasn't, I had raised the hood so I could pull the gas gauge up towards windshield to watch it, worked fine. What's your thoughts on this ? thanks

do these 1997 Nissan trucks have a switch that cuts engine off it oil gets low or do you know for sure?

I have to be honest, I'm not 100% sure. However, I can tell you I never experienced that condition on these vehicles.

Joe

It's weird condition, I checked my oil a little while ago and it's showing low, but this vehicle takes hours sometimes to drain the oil back into the crankcase, might wait until in the morning to check again. One time I didn't allow it to drain back down and over filled it with oil, then had to drain it out. The truck acts like the ignition was just turned off or the gas was just stopped immediately when the truck quits, it's weird, then sometimes it wants to flood when I start it back, then I wait a few minutes then it fires right back up, odd.

Do you think I might have a relay kicking out after it gets hot, maybe working intermittently?

I forgot to tell you that I put another distributor cap on it today.

I ordered another IACV today from an ebay seller that had told me they warrantied this product that I ordered for 2 years. Today it flooded out so bad it quit on me while driving up the road once the motor had got up to operating temperature.If this doesn't work, might have to buy the complete throttle body. Do you think it could possibly be the TPS and it not giving the code for it ? Do those throttle position sensors need to be cleaned occasionally or do you know about that ? Thanks for your answers.

Joe, this is a question that I've been going to ask you but keep forgetting . If I accidentally got some oil or grease on the tip of that PCV that I put in the truck, do you think it could be causing me the problem I have with my truck flooding out? Thanks again for your help.

Honestly, a PCV that is stuck open can cause issues with vacuum. Do you think that is a possibility? Do you feel enough grease got on it to cause it to plug or stick?

Remember I put a new one on, plus I blew both ways to make sure it works correctly and it did.Could I take the hose off PCV and plug the line to see what happens?

Do you think there might be a possibility the line going to the PCV might have a hole in it?

Sure, anything like that is possible. Have you checked for vacuum leaks using carburetor cleaner? If there is a leak, it will draw in the cleaner and the idle speed will increase.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Joe

I need to try that with carburetor cleaner, I think might have a very small problem making me think it's a major one. Thanks

That is very possible. Let me know the results.

Joe

I mean't to say the crank position sensor instead of the PCV in an earlier message I sent you, if I maybe got some oil or grease on the tip of it, do you think it might effect the way it works ? Today I used some carburetor cleaner and there were no vacuum leaks to my knowledge. I ran the truck for a while tonight, it dropped the idling down to zero again and the motor stopped then I took the plastic connection off the mouth of the air filter cover that goes to the plastic air flow all the way across to the drivers side where it sucks the air through a plastic box back to the air filter. The truck seemed to run better that way, maybe the air flow from that plastic box is blocked with debris, maybe leaves or some other material. The truck did not quit after I done that but i need to drive it some more tomorrow.What's your thoughts on that ?

Hi,

The crankshaft position sensor is nothing more than a hall effect magnet. You want it to be clean. As far as the stalling, I think there would be other symptoms. If it is blocked by the grease, I feel it would not function properly at any speed.

Let me know how it runs for you tomorrow with the added air flow.

Take care,
Joe