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Major Problem With Idle...

Gunr32

By Gunr32,
in Engines & Forced Induction

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Gunr32 Enthusiast

Gunr32

Posted
Posted

hey guys,

My oxy sensor wiring from the loom ended up on my manifold and melted both sides..So i bought a new sensor today and installed it.For the loom side i bought a plug with 3 wires attached to it..

i soldered (properly done) the plug with three wires to the loom side,and plug the oxy senor in..everything looked perfect...

The problem is when the air-conds on and i accellerate and let go the car losses idle and shuts off...

yet another problem is that when the car is running i dc and re connect the afm,the cars shuts off..

car has lost power,its boosting but not enough,backfire,uses alot fuel now,basically running rich..

i have checked the afm,tps,iac, all the connections on all the electrical and seems to be fine..

Im thinking its something got to do with o2 sensor,maybe the soldering??

btw its s15 sr20det,walbro fuel pump,fmic,13psi boost,full zorst,stock ecu,

help needed asap plz...

thanks,

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GeeTR Grand Master

GeeTR

Posted
Posted

Straaange.

The ECU could have been damaged, I would have thought pretty unlikely though.

Have you checked the ECU for error codes? Note sure about a S15 ECU, but a Skyline one doesn't shut the car off when you DC the AFM; it goes into limp mode.

Did the car act like this when the O2 sensor was DC?

rob82 Mentor

rob82

Posted
Posted
hey guys,

My oxy sensor wiring from the loom ended up on my manifold and melted both sides..So i bought a new sensor today and installed it.For the loom side i bought a plug with 3 wires attached to it..

i soldered (properly done) the plug with three wires to the loom side,and plug the oxy senor in..everything looked perfect...

The problem is when the air-conds on and i accellerate and let go the car losses idle and shuts off...

yet another problem is that when the car is running i dc and re connect the afm,the cars shuts off..

car has lost power,its boosting but not enough,backfire,uses alot fuel now,basically running rich..

i have checked the afm,tps,iac, all the connections on all the electrical and seems to be fine..

Im thinking its something got to do with o2 sensor,maybe the soldering??

btw its s15 sr20det,walbro fuel pump,fmic,13psi boost,full zorst,stock ecu,

help needed asap plz...

thanks,

You shouldn't solder any wires on any car - they should all be crimped.

What happens if you disconnect the 02 sensor then do an ECU reset by removing it from the harness for 5 seconds? Does it only stall when the AC is on? Is there an ATMO BOV. SR20's shouldn't stall with the AFM disconnected unless there is some other major problem.

green 33 Explorer

green 33

Posted
Posted

I am far from an expert when it comes to O2 sensors so could be wrong about the following statement.

I have heard that one of the wires to the o2 sensor reads the ambient temp and this wire cannot be soldered shortened or the like, but would have thought it would only refer to the wires between plug - sensor.

I have also heard that the ECU can be effected from shorts, best check there would be to borrow a mates ECU swap them over and see if that is infact your issue,

Would be a bonus if you could keep us updated, so many times you read ppl's problems - suggestions, but rarely you read how it was fixed.

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