Engine Miss & Petrol Smell In Cold Start

[LancerL]

I have Corolla CE110 and from recent some times when it start for the first time of the day (specially cold weather) it starts in one turn, runs rpm nearly 1,500 and then a engine miss comes for like 10 seconds then disappear. At that time if I bent down and smelled silencer it gives a little Petrol smell. But in next second the miss disappear, it smells as perfectly normal with water steam.

No issue in pulling power or anything else and no different in fuel economy also.

Only observation when engine hot and with A/C off there is slight vibration sense on steering wheel. That also random and not always.

Is this something that I have to pay attention or it could be something that is normal. But I haven't experience this before.

Please share your comments.

[Rumesh88]

  On 10/9/2015 at 4:44 AM, cefiroA33 said:

Thanks romesh for your advice. In face i am not sure about the TPS in my car. Is there any good work shop to repair these sort of issues? cos I dont think my current mechanic would be capable of doing such repairs.

Regards,

Personally I'm unable to recommend someone. But you can find recommendation in threads like http://forum.autolanka.com/topic/15719-agent-maintenance/page-2?hl=bulugaha#entry253986

http://forum.autolanka.com/topic/15974-good-mechanics-technicians-workshops/?hl=bulugaha#entry261430

[LancerL]

Hi all, sorry for the long silence...

At last I found which was causing above miss in cold start and the petrol smell

You might remember that I did a DIY fuel injector cleaning sometime back?

One thing I found while I was re-fixing the injectors to the inlet manifold is that one or two Orings which seals injector to the inlet manifold was loosen.

Since that was a afternoon and I was tired with cleaning, I did not bothered to visit any auto part shop to replace those.

But with further reading of the forum for similar incidents faced by other members, I got a clue that this might due to sucking excess air from the loosen Orings to the particular cylinder or two which cause a lean mixture.

So the oxygen sensor which detects it, signal injectors to flow more fuel as it thinks the mixture is lean, when mixture is too rich due to above, it will cause an imbalance which we called it as an Engine Miss Fire and smelled un-burned petrol from the tail pipe.

So that coming weekend I again removed injectors and taken out all inlet manifold side Orings and took it to a Auto part shop, cost for four Orings was just Rs. 85/- so I brought another set for further use.

Replaced all four Orings carefully, cleaned manifold holes with throttle body cleaner and a paper tissue and reinstalled injectors back to the manifold.

Disconnected positive battery terminal for a while to reset ECU and reconnected and start the engine and let it to worm up and had a decent drive about 15mins with A/C off.

Its almost nearly two months by now to the job and I have never got this miss and petrol smell again.

So my final conclusion was that this was due to one or more vacuum leaking Oring from inlet manifold.

Project was so interesting although it took lot of time but the satisfaction I got out of this cannot me measured by money.

But if I took this to a Garage for the same, my total bill would exceed Rs. 10,000/- for sure including a tuneup, replacement of Plugs, Fuel filter, Air filter and etc...

Thanks a lot for all of you who has given advises and directions to get this success.