Weird Idoling Problem With Vid Inside*****

[240sx_Guy]

http://www.flickr.com/photos/41312676@N ... hotostream

To start off, I have made sure that I do not have a boost leak or vacuum problem. I replaced all the throttle body lines and re-did all the piping properly. It's funny that my car ran worse after that. Also, the MAF was changed.

The Problem: As you can see in the vid, I have good vac when the car is idling properly but then it drops as well as the vac. The car burps like crazy and can't hold a healthy idol. When the car warms up, it idols better but not perfectly. What is weird is that under full boost when driving the car runs like a champ but at idol it is s***. Also when I step on the gas there is a huge lag but the engine feels healthy once it catches up. It almost feels like the car cant get enough air but then the air catches up to it and it run decently. it also back fires at time.

more info: the car does not have an O2 sensor wired in. it ran properly without it, just a bit rich (car still runs rich)

any ideas?

[SR86]

Odd. What's your TPS set to? It should be around 0.460 volts closed and around 4 wide open if I'm not mistaken.

[240sx_Guy]

I am not sure on that. how would i test this?

any other suggestions? anyone? i am really desperate.

[240sx_Guy]

i just found out how to text it. i will be back soon

[Mazza]

Another thing I might look into are spark plugs, these often get overlooked after I changed and gaped them on my RB it ran a ton better.

[Mazza]

I just watched the video again and it looks like it is maybe a sensor because it seems fine at first then when it goes into normal operation it seems bad...

Still might want to look at the plugs...