Engine sputters at idle PLEASE HELP!

INFORMATION Integra Help
1

After my car warms up, at an idle it starts to sputter. When I drive it, it sputters til about 2.5k rpm and then it goes. I’m thinking its a air vaccum problem but maybe im overlooking something. Please Help

2

ya check your pcv valve and vacuum connections. buy a haynes manual and download the helmes. try a search

3

I’ll try looking at the PCV valve tomorrow. Is there any sign of a bad one? Also, My car will run ok if I unplug the O2 sensor right? If I unplug it and the car runs fine then I’ll know thats the culprit. Am I correct in saying that?

4

O2 sensor

5

Originally posted by jgn77
I’ll try looking at the PCV valve tomorrow. Is there any sign of a bad one? Also, My car will run ok if I unplug the O2 sensor right? If I unplug it and the car runs fine then I’ll know thats the culprit. Am I correct in saying that?

Yes, you are correct.

6

This is the popular belief but is not the case…

Consider this scenario… you have a poorly functioning CTS that’s causing your fuel injectors to pulse too much under little load when warming up and causes a rich condition (the car sputters b/c it is being flooded).

Now… you ASSUME that the O2 sensor is the problem, so you unplug it. Ahhh ha… the idle returns to normal. now… when you unplugged the O2 sensor, the car is now running in limp mode with preset data from all inputs.

How do you know that the CTS isn’t the problem?? You don’t. If you want to test the O2 sensor, use a dmm when running or a dmm with a blow torch on the bench… .1…0…1… (.1V or 0V to increase the stoichastic (sp??) fuel ratio to optimum… in my idiot-speak – the correct ratio or A/F (14.8.x : 1 I think that’s close)… start the flame wars…

Anyway… enough b.s. for now… your ECU could be recieving a faulty reading from the MAP sensor also (one of the best predictors of engine vac. according to your ECU). If you force the car into limp mode by setting a code, all yo have determined is that there’s a problem SOMEWHERE. Read the code and see where it points… this will help narrow things down.

Email me privately and I may be able to help you out.

Thanks guys!

Andrew.

aka neex.

7

it’s most likely your spark plugs and wires.