240sx bogging

[tman6500]

Well I replaced the temp sensor and got new plugs and gaped them. The car sounds better but still does the same thing half throttle or wot the car bogs anything less car is fine idles fine revs all the way up fine. No check engine light or any codes.

[Butcher240sx]

What's the tps voltage set at? Maybe take the injectors to get serviced and flow checked.

[BONIN240SX]

anyone else think that maybe ohm/voltage checking the tps? mine didnt throw a code but i changed it and problems went away!

[tman6500]

Tps is like 2 weeks old

[Butcher240sx]

I'd start de looming the engine harness looking for brittle, burnt, or cracked wiring next. The temp sensor you replaced has two wires right, what voltage did you set the TPS for? Ever replace the o2 sensor?

[tman6500]

Yes two wires on temp sensor. TPS was installed. By a shop would think they put it in right as the reading were bad on the original one. The o2 sensor I have never replaced.

[nsfmike240]

sounds like a tps plug is unpluged or needs adjustment

[tman6500]

I will check to see what the shop set the new TPS to. Im guessing I check ohms when closed and then open volts on power wire is what 5v and then ground?

[tman6500]

Just checked the the o2 sensor got the car to normal engine temp and the computer said it was "open-loop" shouldn't it be closed when idle at normal temp?

[Butcher240sx]

Yes it should be in closed. TPS voltage should be right under .5V . Back probe the middle wire and check the voltage. Mine is set at .45V. The O2 sensor is a service item to ne changed every 15K miles. It's only $15. I don't want to see you keep throwing parts at the car so hopefully that is it.

[tman6500]

Going to replace the o2 sensor today.

[tman6500]

O2 sensor in and car is sill doing it. The car runs better and starts right up fast now but still bogging. It it means anything the tip of the sensor was white.

[Butcher240sx]

Any word on the TPS voltage? Are you absolutely sure you have no vac leaks? Was the mafs and dizzy new or used? Does it only bog under load or also when free revving in neutral?

[tman6500]

Have not checked the TPS volts yet. Yes 100% no vac leaks mafs and dizzy are new. Yes only under load but fine revving in neutral.

[tman6500]

So today i was checking all the basic things again some for third time and first i checked the injectors i just drove the car and now the car is cold the first 3 injectors were all around 11.8 .4 off was the most but the forth was at 15.8 then i tuned the engine on and put my ear on the end of a screwdriver which was on the injector could hear the clicking of all the injectors but that forth one. So i was guessing it was bad but after a drive around engine warmed up i tested them again all were around 12.8 and all were clicking like they were working. Could a injector work and sometimes not work.

[Butcher240sx]

absolutely can change with heat. sounds like a bad injector. I thought so, thats why i recomended having them serviced and checked. grab a used one to check before running ot and buying a new one.

[tman6500]

Any point in getting rebuilt injectors or are they not worth it.

[cubaguy]

Seafoam! Jk

[Butcher240sx]

I would start with one that you know is good and see if that is your problem. Might even be a bad injector driver in the ecu. Rebuilt injectors are fine too.

[tman6500]

Taking a working one from friends 240sx on monday

[tman6500]

The injectors in my friends car are 2 months old. Put in one working injector from friends 240sx and still doing it so I then put in the other 3 injectors. I can feel a power difference but still bogging at 50% throttle or wot. Still no codes or check engine light.

[Butcher240sx]

did you lube the new o rings for the injectors? New o rings?

[tman6500]

New o rings yes there was some lube on the injectors how much is needed?

[Butcher240sx]

Doesn't take much lube. Really starting to sound like a wiring or ecu problem. Ignition timing is correct right?

[Butcher240sx]

Make sure you are gettin good voltage at the injector clips.

[tman6500]

Going out this morning it does it when I rev around 4k 4500k

[tman6500]

Friend said it could be a sensor on the transmission?

[Butcher240sx]

So its rpm based or throttle position based?

[KiLLeR2001]

Whats your fuel pressure reading at? Could be a bad pump or bad wiring for the fuel pump. Check voltage going to the fuel pump.

[tman6500]

Couldnt tell which it was will look more in to it tomorrow.

No fuel pressure gauge hooked up last i checked it was 40 psi at idle. Fuel pump is around a month old will check it out tho thanks