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Old 27th April 2015, 10:14   #1
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Default Engine dead spot right after a cold start



Hi All,

I have a Honda City I-VTEC (MT) which has completed 35.5K of regular running. Serviced regularly at the ASC. For the last 4 months I'm observing a strange behaviour with engine and would appreciate any insights as the ASC technicians are clueless -

When the engine is started first time in the morning and if I start driving right away with the engine temp. blue light still on, everything is as expected till I switch from 3rd to 4th gear. At a speed of 40 Kmph, a shift from 3-4 gear leads to a slump in the engine RPM as if the engine was suddenly starved of fuel. It then picks up again but the behavior is consistent for the last 4 months.

The natural suspect was fuel quality in Hyderabad so I switched to Shell and other reliable outlets without any change. The ASC also ran a full diagnostic on the system and did a reset of the ECU. That too did not bring any change to the behavior. The air filter has been replaced too.

Any insights about what to look at or how to troubleshoot will be greatly appreciated as I really need to get this resolved.

-Thanks,
Ashish.
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Old 27th April 2015, 10:37   #2
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Default re: Engine dead spot right after a cold start

Have you tried checking the throttle body, and idle system? Also do check if the injectors and fueling system for any minor blocks. Starvation seems to be a fueling issue hence suggesting these.
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Old 27th April 2015, 11:28   #3
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Default re: Engine dead spot right after a cold start

What i can suggest-
1-Check fuel pump and fuel filter.
2-Injectors.
3-Fuel tank for debris and water.

Looks like a typical fuel starvation issue.
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Old 27th April 2015, 11:33   #4
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Default re: Engine dead spot right after a cold start

Check the Fuel Pump,Fuel Filter and Injectors.
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Old 27th April 2015, 11:54   #5
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Default re: Engine dead spot right after a cold start

Guys this happens during start and cold engine, The OP does not confirm of this behaviour when the engine reaches temperature. its the MAF sensor which might be causing the issue. Ashish can you replicate the issue? does it happen only during a certain conditions? If yes then please take the car to the A S S, ask them to swap the MAF sensor with a working one and try to replicate the issue. If it is gone then you know what is the culprit.

Pramod
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Old 27th April 2015, 12:06   #6
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Default re: Engine dead spot right after a cold start

Thanks for the responses. Can you point me to some good DIY article and a MAF cleaner that can do the job?
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Old 27th April 2015, 13:33   #7
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Default Re: Engine dead spot right after a cold start

See this DIY article on Team-bhp on MAF sensor cleaning

http://www.team-bhp.com/forum/techni...-rs-120-a.html
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Old 27th April 2015, 13:45   #8
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Default Re: Engine dead spot right after a cold start

My Jazz displays identical behavior, despite injectors and throttle body being cleaned regularly. I find that using System G fuel additive helps. But the biggest part is played by the fuel itself. There are times when I get genuinely good fuel and it shows in the drive: pick-up improves and this flat-spot issue subsides on its own.

The important thing to note is that these iVTECs are tuned for 91 octane petrol (there is a bold sticker on the inside of the fuel tank lid of my car saying the same), hence are quite sensitive to substandard petrol which we, unfortunately, often have to make do with, even in Delhi-NCR.
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Old 28th April 2015, 17:51   #9
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Default Re: Engine dead spot right after a cold start

If the problem is only during cold starts then its the O2 sensor.

If you plugin an OBD, you'll get a P0141 or similar error.
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Old 28th April 2015, 17:58   #10
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Default Re: Engine dead spot right after a cold start

I've had this problem in the Fiesta petrol and it was due to faulty O2 sensor. The Fault code will tell this.
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