Josh_Path2346

Before all of these issues it would run just fine with or without the air cleaner. After the car wash incident it got a new cap, rotor, and wires. I also cleaned the plugs just to be sure. Not sure if I could build a smoke machine but that would be something I might have to take to a shop and I doubt anyone around here could figure it out. The EGR has since been deleted and is blocked off by a gasket and metal plate that I made, which I suppose I could check and make sure. I just finished rebuilding my other throttle body, and plan to put it on tomorrow when I get a chance. I have the entire FSM in my Google drive, and since this seems to be a vacuum problem with a code 55 on the ECU (1988), there's no way I can use the OBD system. I have several MAFs that I tried with the rebuilt TBI but neither of them changed anything. When I rebuilt the new TBI unit, I took it all the way down to just the shell, meaning I even removed the throttle bearings, seals, and butterfly shaft and then put them all back after it was clean. The only thing I could have found was that the idle up solenoid with the blue shrink wrap on it has exposed wires at the end. However after the car wash incident it did seem to clear up, but a whistling noise and persistent lack of power developed which led me to take this course of action.

It seems that no matter what I do I can never get this right. I've rebuilt several different throttle bodies using components from several different vehicles and none of them seem to work, aside from the original one that came with the car, of which I have never opened. I've tried different methods of cleaning each part of the throttle body including submerging in a ultrasonic cleaner and then reassembling with a gasket kit and following the instructions to the letter. Whenever I put on a different throttle body it acts like it's not getting any signal to the mass air flow sensor, the idle surges up and down and it sounds like a massive vacuum leak. This is a problem for which I brought it back to the local dealer in 2019 and had them fix by running a wire directly from the MAF to the ECU. Recently I decided to fix this myself as I discovered what they had done and was not very pleased. I tore apart the entire wiring harness and replaced several shielded cables and installed brand new, watertight connectors on everything related to the engine. Since then it had been running great for about 2 weeks. I took it through a car wash and noticed that my idle was below 500, something that I tuned myself, and the engine usually hovered around 850 while sitting at idle in park. I decided I've had enough, and since I had a spare intake, I removed all of the vacuum ports and plugged them with brass plugs wrapped with plumbers tape to get an airtight seal. Since replacing the throttle body it is been doing exactly what it did 5 years ago, which is a surging idle that is between 1,500 and 2,500 RPM, vacuum leak noise, but it isn't running rough. Their fix was, as mentioned above, just a stopgap to get me out of their shop. I guess my question is, is there something I didn't do right when rebuilding my throttle body? Is there something I'm missing as far as deals or gaskets? Does anyone have a spare TBI unit I can buy that might help solve this problem? If I keep running into trouble I'm going to just buy the Weber carb kit and be done with it. The instructions I followed can be found here: https://drive.google.com/file/d/1purnxdLGXwa3QRe0OGG8C_oKFBT-y7iQ/view?usp=drivesdk And the rebuild kit I used is here: https://www.rockauto.com/en/catalog/nissan,1988,pathfinder,3.0l+v6,1211791,fuel+&+air,throttle+body+repair+kit,12939

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I cant seem to find new weather molding for the 2 big side windows on the first gen Pathfinders. Amazon, Nissan Parts Deal, eBay produced no results, so Im thinking about pulling it out and using flex seal to fill the gaps? Anyone point me towards a solution?

I cant seem to find new weather molding for the 2 big side windows on the first gen Pathfinders. Amazon, Nissan Parts Deal, eBay produced no results, so Im thinking about pulling it out and using flex seal to fill the gaps? Anyone point me towards a solution?

I have already checked for codes and it gave me #55 (no malfunction). Its a new tbi unit so Im assuming the whistling is because I cleaned the EGR port and the pipe on the mixture pre-heater is making it whistle. Ita at a shop (that I work at) and Ive gotten it to run. However, it is extremely rough. The surging has gone done quote a lot, it idle and runs, but is very, vey rough. I replaced the 2 injectors and we tried messing with some vacuum lines but its stop really rough. Maybe ignition timing?

And the whistling noise is coking from inside / underneath the throttle body. However I have just swapped tbi units and its still whistling so its not a gasket. Im thinking the mixture heater pipe is causing the EGR tube to make a whistling noise

Im pretty sure it isnt timing because itll run for just a few seconds then ill choke itself out while it sputters to a stop. My timing belt was serviced before I bought this truck but the sticker has been wiped clean so I cant see the mileage anymore.

What happened, did you get it fixed? Im having a similar problem

I have an '88 Pathfinder 3.0 v6 that has been giving me trouble for the past 5 months. I just replaced the throttle body (entire unit, sensors too) and now I have a whole new problem. It used to surge up and down erratically, but now it wont even stay running. I think its flooding itself out. It also has a high pitched whistle (no, I dont have a vacuum leak. Ive checked) and will run fine for a few seconds then stumble and die. Ive been struggling for months with this problem, can someone please help me?

Tried searching for a vacuum leak but nothing worked. Sprayed everywhere with starting fluid and nothing happened. Gonna replace the tbi unit

How did cleaning your tbi go? Did it start working again or give you any problems? I rebuilt mine and now its wheezing and whistling and revving up and down

Thanks, Ill give it a try. Anything else I could test while Im at it? Im pretty close to just buying a new Throttle Body unit

Well, it does have suction, but I can put my hand over it and it doesnt change anything. I have tirelessly searched this and other forums for a problem like mine and havent found an answer. Im close to just sending it somewhere to get fixed

I searched for vacuum leaks and couldn't find anything. Sprayed every hose on both ends and the engine didnt react. After a few minutes amd a couple starts I ended up vapor-locking it and gave up. Got any other ideas?