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Car misses in the mornings.

Tiny
CJSOARES
  • MEMBER
  • 1999 TOYOTA CAMRY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
Upon Startup and immediately accelerating, the engine "misses" and the tachometer needle either drops to zero or bounces erratically. The car can also switch off at this point. Any suggestions as to what might be the cause. The problem usually disappears when the engine is warmed up.

My car is a Toyota Chaser JZX100
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Sunday, December 12th, 2010 AT 7:33 AM

17 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
This seems to be a problem with the ignition coil. Have the coil tested.
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Sunday, December 12th, 2010 AT 7:44 AM
Tiny
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That was fast. Thank you KHLow2008.

I will have it checked and let you know how it goes. Although I will be taking an overseas trip and my not get a chance to do it this December, but will surely do it in Jan 2011. Have a very Merry Christmas and a Happy New Year 2011.
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Sunday, December 12th, 2010 AT 8:48 AM
Tiny
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Hi again KHLow2008,

Do you know what the part number of the ignition coil for my car might be? I might go right ahead and order one and have it replaced without doing any tests.

I am a complete newbie with cars but would like to try and get this fixed by my self if I can.

Thanks,

John Soares
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Sunday, December 12th, 2010 AT 9:01 AM
Tiny
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Any idea why this happens in the mornings?
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+1
Sunday, December 12th, 2010 AT 9:42 AM
Tiny
KHLOW2008
  • MECHANIC
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When engine is cold, fuel is richer which would be harder to ignite and weak sparks would tend to misfire. After warming up, the same sparks would be easier to ignite as fuesl is leaner and conditions are warmer.

Have the spark plugs and wires cheked out as well.

Our database does not have any information on the ignition coil specification so I am not able to provide you with the part number.
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Sunday, December 12th, 2010 AT 2:08 PM
Tiny
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Thanks KHLow2008
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Sunday, December 12th, 2010 AT 4:19 PM
Tiny
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I figured out the Ignition Coil par number for my car and it's 90919-02216. Correct me if I am wrong, because my car is a six cylinder, there should be six of these in there right?
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Sunday, December 12th, 2010 AT 4:23 PM
Tiny
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Anyways, I can only see two ignition coils and what I did is, I disconnected the cable to one and what happened is that the car started but turned itself off after like 5 seconds. How do I test which ignition is giving trouble? It's a VVT-i 2.5l Engine.
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Sunday, December 12th, 2010 AT 4:29 PM
Tiny
KHLOW2008
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Yes, for 6 cylinders there shold be six if it is Direct Ignition System. Usually not all would be faulty. A resistance test of the coils might indicate which is faulty.
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Sunday, December 12th, 2010 AT 4:29 PM
Tiny
KHLOW2008
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If you have spark plug wires to the spark plugs, it could be a 2 coil system. Each coil would supply 3 cylinders. You have to perform a resistance test on the ignition coil. Get the spark plug wires ohmed out as well.
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Sunday, December 12th, 2010 AT 4:39 PM
Tiny
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Thanks a ton KHLow2008.

I will check it out and let you know how it goes.
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Sunday, December 12th, 2010 AT 5:15 PM
Tiny
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KHLow2008 do you have a manual showing how a 2 coil system works. Would like to read about it just for my info.
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Sunday, December 12th, 2010 AT 6:14 PM
Tiny
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Hi again,

Could you please tell me what the connector(s) in the pic are for (Marked in red arrows)?
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Sunday, December 12th, 2010 AT 7:16 PM
Tiny
KHLOW2008
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The upper terminals are for power supply and signal from the Ignition Control Module and to tachometer.

The lower spout is for the distributor coil wire.

Our database does not have any information on your vehicle so I am not able to get any information for you regarding the dual coil system. Yours should be dual coil with distributor.
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Monday, December 13th, 2010 AT 12:39 PM
Tiny
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Thanks.

Just a quick one, can water in the gas tank also cause this?
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Monday, December 13th, 2010 AT 12:45 PM
Tiny
KHLOW2008
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Yes, it definitely would cause misfiring but it would be rather consistent, not only when engine is cold.
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Monday, December 13th, 2010 AT 1:11 PM
Tiny
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Yeah, that's right. Thx
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Monday, December 13th, 2010 AT 1:40 PM

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