Hey Bucke77 or other VTCOA Mechanics

[Get Bit]

Genric question for you..

When reading a generic OBDII scanner hooked to a 5 gas analyzer, you notice that the particular car you are working has a high amount of HC's and the car failed emissions yesterday. The customer states that it runs rough at idle, but the car runs well at off idle or WOT operation. Using your scanner you also notice that a vaccum line is loose under the hood, and the Injector pulsewidths are higher than idle operation by 1.2 Miliseconds, and the LTFT is at -6.

What is the problem??? :dontknow:

 

[Nowwhat]

Genric question for you..

When reading a generic OBDII scanner hooked to a 5 gas analyzer, you notice that the particular car you are working has a high amount of HC's and the car failed emissions yesterday. The customer states that it runs rough at idle, but the car runs well at off idle or WOT operation. Using your scanner you also notice that a vaccum line is loose under the hood, and the Injector pulsewidths are higher than idle operation by 1.2 Miliseconds, and the LTFT is at -6.

What is the problem??? :dontknow:

bad muffler bearings.....

 

[Get Bit]

Thanks, I was trying to narrow it down between that and a bad flux capacitor.

 

[FerrariTruck]

Genric question for you..

When reading a generic OBDII scanner hooked to a 5 gas analyzer, you notice that the particular car you are working has a high amount of HC's and the car failed emissions yesterday. The customer states that it runs rough at idle, but the car runs well at off idle or WOT operation. Using your scanner you also notice that a vaccum line is loose under the hood, and the Injector pulsewidths are higher than idle operation by 1.2 Miliseconds, and the LTFT is at -6.

What is the problem??? :dontknow:

well if there is vacuum line loose this will cause a lean condition only at idle. at higher rpms the vacuum leak doesnt affect it much. The injector pw's are higher as the engine management istrying to compensate for the leak. check induction system for leaks, try using a can of brake cleen and spray down the intake manifold and see if theres a change of rpm when you spray in a particular spot(ie the leak)

 

[TheMoparConnection]

what kind of vehicle are you working on...engine etc???

 

[BOOMER]

make sure the cats are not clogged, and the downstream 02 sensors are working correctly

 

[Stingray]

How did the scan tool indicate a vacuum line was off? And your pulsewidths are higher but the LTFT at -6 indicate the PCM is pulling fuel. Is the fuel pressure regulator leaking fuel into a vacuum line?