2G Two Codes: p1400-emission controls and p0505 idle control

[daltah]

The codes I pulled off of my car are p1400-emission controls and p0505 idle control. Anybody have any good tips to what this is? Thanks

 

[blueninteytwo]

what are the symptoms of the problem? obviously you're having one, and if you're not, clear the codes and go on your merry way.

 

[daltah]

The car idles at 1200 rpms and it sounds and smells like it might be running rich because it pops and gurgles a little at idle and the exhaust has a strong smell.

 

[95 'clipse RS]

check for boost leaks, and check your ISC motor (Idle Speed Control). then if its still not it, check out your emissions system, hoses, canister, purge solenoid, and possibly the gas cap. hope this helps

 

[synthetek]

P1400 is the MDP sensor

 

[daltah]

Where is the ISC motor and how do I check it to see if its good? Also can emissions control code be from a o2 sensor and high flow cat?

 

[synthetek]

Where is the ISC motor and how do I check it to see if its good? Also can emissions control code be from a o2 sensor and high flow cat?

The ISC motor is on the lower part of the throttle body here is some info about testing the ISC http://dmtalon.v8eaters.com/ISC.html . As my post above says the P1400 code is the MDP sensor which is located on the top of the intake manifold. The obdII scanners form autozone & stuff don't always give the correct description of the code, thats why it says P1400 emission control, its just giving you a generic description you need to cross reference those codes to the actual cel codes specifically for our cars to get the correct description. A bad or non existent cat would give a code for a bad rear o2 sensor, but that is not the code you are getting. Check your MDP first, the MDP code can also be related to EGR problems.

 

[daltah]

The ISC motor is on the lower part of the throttle body here is some info about testing the ISC http://dmtalon.v8eaters.com/ISC.html . As my post above says the P1400 code is the MDP sensor which is located on the top of the intake manifold. The obdII scanners form autozone & stuff don't always give the correct description of the code, thats why it says P1400 emission control, its just giving you a generic description you need to cross reference those codes to the actual cel codes specifically for our cars to get the correct description. A bad or non existent cat would give a code for a bad rear o2 sensor, but that is not the code you are getting. Check your MDP first, the MDP code can also be related to EGR problems.

How do I know if the MDP is working and the EGR is too? Thanks for the help

 

[daltah]

How do I know if the MDP is working and the EGR is too? Thanks for the help

Would I test it the same way as the other one?

 

[synthetek]

The MDP is on top of the intake manifold, its a little sqaure with a bolt on each side of it. Take it off & make sure the hole in the bottom is not plugged and clean it if its dirty.

 

[Artago]

Hey I figure I'd hop in on this thread. I have the same codes P1400 and P0505. I also have a P0136 code (even though I have a brand new rear O2). I also have major idle issues. Plus my Vacuum is inconsistant, at idle it holds at 10-11 HG.

Anyways, I just tested my ISC, so I know it's fried. Also, it's physically broken. So I ordered a replacement.

Regarding the MDP, I checked the hole beneath it, it's not plugged at all. How do I test the MDP itself?

Also, could the P0136 be related to any of this?

Can anyone participating on this thread give me an update of their progress? It would really help me out. I'll update after I get my new ISC and install it.

Bye for now,

Tom