Slight miss at idle, loss of power, bad consumption

[SaadUK]

Dear Experts,


I am having this issue, the car has started to miss a bit at idle, one can feel the vibration at idle. The fuel consumption is poor and feel loss of power especially torque.

 

[marius]

Coilpack on the way out

 

[SaadUK]

Thanks for the reply. Please advise how to find out which coil is bad? Also can it be injector clogged issue aswell?

 

[SaadUK]

Bump...

 

[re_guderian]

Dear Experts...

... Please advise how to find out which coil is bad?

hard to nail down w/o a code. You can get a new one, and rotate it through the positions to see if it goes away.

.Also can it be injector clogged issue aswell?

Yes.

Not to be short with you, but I've been chasing down similar issues for a looooong time, but without the power loss. Just a miss/stumble. Very difficult to trace down. OTOH, I've put about 25K miles on it like that, including 1500 last weekend where I got 15 MPG, so I'm learning to deal...

 

[SaadUK]

Today I acquired the following readings. Are they of any help to. Diagnose the problem?

 

[PADDO]

Your LTFT values suggest too much fuel/not enough air. Here is a screen shot I took several months ago. Not saying my results should be considered benchmark, but I'm very happy with my overall performance and fuel consumption. Maybe you have a failing injector? I assume you've done the standard MAF and throttle body clean, good air filter, checked for vacuum leaks, spark plugs are good and burning clean with uniform color across all cylinders - the list goes on

Sent from my iPhone using IH8MUD

 

[SaadUK]

Thank you very much for the reply. Ill check each and everything you mentioned above. One thing I would like to mention is that today upon initial start, the car gave thick bluish smoke for a very short period, maybe a couple of sec. But it never gave the smoke again. Is that any indication or normal.

 

[FlammableFishie]

I'm not very knowledgable... Could O2 sensors have anything to do with this?

 

[PADDO]

Thank you very much for the reply. Ill check each and everything you mentioned above. One thing I would like to mention is that today upon initial start, the car gave thick bluish smoke for a very short period, maybe a couple of sec. But it never gave the smoke again. Is that any indication or normal.

I also note your idle speed seems high at 790rpm, my hot idle in park, no ac, is closer to 700rpm, ignition advance at 20 degrees, mine ranges from 11 to 14 at idle and with throttle position of 14 degrees and yours it at 16. The negative LTFT numbers say that your ECM is reducing the injector duration to reduce fuel delivery to get back closer to the optimal designed fuel/air ratio or on the flip side there isn't enough air for the fuel being delivered. The ratios are all close so whatever is going is probably common to both banks and their sensors, so I'd look at MAF, throttle body crud build up and air filter to start with. It wouldn't hurt to run a can of brand name fuel system cleaner through too. I like BG44k. About the bluish smoke on start, not exactly normal for a healthy 2UZ, is it using oil? Is this a new problem coincidental with the aftermarket exhaust or something that has developed over time?

 

[SaadUK]

Dear PADDO,

Today I acquired new readings through techsream. I havent done anything to the car howver the these readings are with AC turned off.

Thank you