bogging

[bobbyk]

i have a 95 w/ a 2.4 that is fuel injected. i haven't been able to get it into the shop yet so i figured i'll ask you guys for some input. when i start the truck after it sits for awhile it'll idle fine but when i start driving it boggs down bad and starts popping. it's been progressively getting worse and more frequent. i'm thinking maybe the fuel pressure regulator but i wanted to see if anyone else has had this issue.

thanks for any help

[camoit]

That or dirty injectors, timing is off, tight valves, Timing belt has slipped or getting ready to break. Vacuum leek, MAF is dirty. Fuel filter is plugging up.

[bobbyk]

Thanks. The timing is good, I just did the belt a couple months ago. I also did the fuel filter. So we'll see what happens when I get it in shop. I'll keep you guys updated.

[bobbyk]

well i just checked it out on my lunch. its my idle speed motor position sensor. $320 our price, it lists for $500.....holly crap! the good thing is that if i let it warm up it'll idle rough for a minute then clear up...for now. so maybe i can get some more time out of it before it completely shits out.

[camoit]

Is the engine light on? If so you can pull the codes with a multimeter.

[bobbyk]

The light isn't on but there is a code stored, I checked it with the verus. It's code 15(motor position sensor) apparently it doesn't stay light because it clears up. I checked the resistance in the sensor and its not within spec. I'm just waiting now to get some money for the sensor.

[recian]

The idle sensor has no issue with bog off idle. You sure you don't mean the TPS? Throttle position sensor? Because that would make sense

[bobbyk]

it boggs if jump in the truck cold and start driving but if i let it idle before driving it'll idle rough for a second then the rpm will bump up. it usually does this twice then i can drive it with no problems. the motor position sensor controls the plunger in the idle speed contol motor. i tested the resistence in all of the sensors and that was the only one not within the specs. but i'm gonna get into it alittle more before i spend that much money. just haven't had the time lately.

[BradMph]

Sounds like carb settings or dirty mixture needles, choke settings.
TPS can cause hesitating and rough idle and such. The wife's car coded a tps error and it was getting scary sometimes crossing a busy intersection with the delay the engine would do when hitting the gas.

[LSR Mike]

Brad,
No carb or needles, or choke, the 95 4g64 is Fuel injected, not picking on ya. It's sounding like a o2 sensor going bad. not working when it's cold so the ECU is in limp mode, once it warms up and is sending a good signal, the ECU goes closed loop and adjusts the mixture correctly for the environment.

Is this a cols start issue only?

[BradMph]

ohh ooops...thanks Mike no problem bud!. Sometimes when our microwave is running it effects the metal plate I have and I start to hear radio stations and voices and all kinds of weird things. Thanks again :cheers:

[bobbyk]

Yea, it is cold start only.

[LSR Mike]

ohh ooops...thanks Mike no problem bud!. Sometimes when our microwave is running it effects the metal plate I have and I start to hear radio stations and voices and all kinds of weird things. Thanks again :cheers:

do ya pee your pants also?:grinno:

[bobbyk]

Ok so I'm all fixed up now. I hooked up the verus again and went into the trouble shooter section and checked code 15. There was a hint in there that a build up in the throttle body can cause the code. So I cleaned it and adjusted the throttle screw and tps sensor. No more weird idle, bogging and codes.

[camoit]

That was an easy fix. Helps to have Verus