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Discussion Starter #1 (Edited)
Hello All,

First time poster, long time lurker. Would love some advice on this one please.

My wife’s Swift is driving me crazy. It is a 2005 Swift with 125KM on the clock. I have had ongoing misfire problems for the past 6 months. I have also had a recurring P0420 code.

After replacing the pre-cat o2 sensor the P0420 was resolved.

The intermittent and repeated misfire was initially diagnosed as a faulty coil. You could see where the spark was arcing out of the coil. All coil packs, leads and plugs were replaced. Issue went away for a couple of months.

Misfire returns. Same symptoms, intermittent misfire, no CEL, only under load. Mechanic said they had a bad batch of coils and replaced again. Also put new Iridium plugs in. No misfire for a couple of days. But then returns.

Also a P0108 CEL code appears. Data shows that the manifold pressure when the CEL went on was 118KPA (probably about the atmospheric pressure). Car is running fine otherwise so I clear the code and it sensor is reading normal (about 35KPA when idle or 100KPA when turned off with key on).

Next visit to mechanic, coils inspected and appear fine. Mechanic replaces cam angle sensor. A couple of days later and it is still missing intermittently but only when cold. Take to mechanic but it was running perfectly.

Where it is at now. About every few days, when the car is started (when engine is cold), it shakes and shudders like mad and loses revs to the point of almost stalling. It only corrects itself after revving it up a few times. It then drives with a bad misfire, bunny hopping under load, for the first KM or so until warm. It then runs perfect, really well in fact. When I plug in scanner immediately it shows misfire in various cylinders and random misfire. I have attached the freeze frame data from one of the recent episodes.

What could be the cause of the most recent issue?

Appreciate any thoughts on this as the mechanic is also scratching his head.
 

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Whatching your post with interest.

Also my first post.

2008 model swift similar mileage. Only difference is that I have no misfiring I have a sudden revvingto 6000rpm and is now happening more frequent. Difference is it happens at random while driving. Realy scary when gearing down and suddenly she takes off.
 

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Hello mastamike,

I am also facing the same issue. I am driving Swift 2009 lXi and for the past one year i am facing the same. I even built the engine again completely replaced spark plug, Ignition coil, head, nd all. But it is still ter and as u said it is coming and going .
Yesterday (30/01/2016) gave it to Maruti for servicing the problem and hoping for the best.

One Doubt -Did u noticed or heard any hissing when u pressing the gas pedal? Cos, whenver i hear that noise , i see this misfiring. Yesterday when i was on the way to Maruti i dont see any jerk or miss and engine was so normal.
My doubt is may be of Vaccum Leak is happening.
 

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OP:

Scary that your mechanic cannot diagnose the issues..

You very well may have a vacuum leak, which is best tested when cold.. You will need to watch your fuel trims for proper diagnosis, and/or use a spray water bottle and cover all intake joints, you will hear and see the results..

... Philip
 

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Hi aquanaut20,
Today they have tested my vehicle for Spark plug and Ignition Coil and there is no issues with that. They have checked the Vaccum leak also and i was told it is fine.
Next check is ECM. if that is also fine then they said they need to check the Engine - valves, spring etc.

4 months back only i reworked the engine fully for 60k. :(
 

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If they are checking for leaks when hot they will not locate, heat expands the intake runners, did they use a smoke machine??

A compression test will check the valves and engine timing.

... Philip
 

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Yes aquanaut20, they told something about Compression machine only. Engine Hot - i am no sure, and mostly they would have done when it is Cold. Since car was there for last two days, it shouldn't had run.
Will check with them today.
 

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I presume the mechanic has used a scanner to check the O2 and Fuel trims, then used a scope to check the current ramps on the injectors and coils, then on to the wave forms for the Crank and CAM sensors...

BTW, they shouldn't be throwing parts unless they have confirmed they are N/S..

... Philip
 
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