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Old 12-09-2016   #1
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Fiat punto grade 1.4 sounds really bad

Hi there, I've changed the sparks, leads, and coil pack now my engine either won't start or when it does sounds uneven stinks of petrol and vibrates violently(sounds like a diesel). I'm really at odds what's happened what I've done wrong and how to fix it. I drive a fiat punto grande 1.4 2009
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Old 12-09-2016   #2
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Re: Fiat punto grade 1.4 sounds really bad

Have you put the plug leads on in the right order from the coils? (i.e., replaced one lead at a time)
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Old 12-09-2016   #3
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Re: Fiat punto grade 1.4 sounds really bad

Stupidly no... the new leads have completely different numbers on them compared to the old ones, but I have been assured they are the correct ones
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Old 12-09-2016   #4
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Re: Fiat punto grade 1.4 sounds really bad

Quite possibly you've put the wrong leads to the wrong plug. By sounds of things anyways its firing incorrect.

did it fire ok before you changed the leads and coil packs? If no then i'd be looking at how you've plugged in the new leads.
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Old 12-09-2016   #5
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Re: Fiat punto grade 1.4 sounds really bad

Before the change yes it sounded normal, no vibration etc I've tried every different combination but still can't figure it out
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Old 12-09-2016   #6
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Re: Fiat punto grade 1.4 sounds really bad

In which case, you've either put the leads on the wrong plugs from the coil, or you have a faulty coil.

The coil should have a number next to each output, this will be your cylinder number. Cylinder 1 starts at the timing belt side of the engine, and cylinder 4 at the gearbox side.
Ensure you have the leads from the corresponding cylinders to the correct output number on the coil. That should sort you.
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Last edited by MrDerv; 12-09-2016 at 12:00.
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Old 12-09-2016   #7
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Re: Fiat punto grade 1.4 sounds really bad

you've possibly got the combination wrong so in order of the timing of sparks.

either this or one of the new leads could be faulty. Try using your old leads but you need to have the combination correctly or else it will always misfire
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Old 12-09-2016   #8
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Re: Fiat punto grade 1.4 sounds really bad

Is it literally a guessing game when it comes to the combination or can I find out correct sequence some where? What's the best way about it?

I do hope it's not a faulty new coil lol
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Old 12-09-2016   #9
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Fiat punto grade 1.4 sounds really bad

Quote Originally Posted by brickfoot View Post
In which case, you've either put the leads on the wrong plugs from the coil, or you have a faulty coil.

The coil should have a number next to each output, this will be your cylinder number. Cylinder 1 starts at the timing belt side of the engine, and cylinder 4 at the gearbox side.
Ensure you have the leads from the corresponding cylinders to the correct output number on the coil. That should sort you.



Both old and new coils doesn't have a number on the outputs
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Old 12-09-2016   #10
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Re: Fiat punto grade 1.4 sounds really bad

Quote Originally Posted by Qwerty91q View Post
Both old and new coils doesn't have a number on the outputs
Looking further into it, is the coil mounted to the top of the engine?

If so, the lead order is 1-1, 2-2, 3-3, 4-4. Looking directly

I.e. cylinder 1 lead connects to the first plug hole on the coil, and so on. Work from the timing belt side of the engine first.
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Old 12-09-2016   #11
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Re: Fiat punto grade 1.4 sounds really bad

Quote Originally Posted by brickfoot View Post
Looking further into it, is the coil mounted to the top of the engine?

If so, the lead order is 1-1, 2-2, 3-3, 4-4. Looking directly

I.e. cylinder 1 lead connects to the first plug hole on the coil, and so on. Work from the timing belt side of the engine first.

Yes the coil is mounted on the of the engine.

I understand the lead order but the lead numbers I have are

1, 1, 2, 7
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Old 12-09-2016   #12
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Re: Fiat punto grade 1.4 sounds really bad

Quote Originally Posted by Qwerty91q View Post
Yes the coil is mounted on the of the engine.

I understand the lead order but the lead numbers I have are

1, 1, 2, 7
Ignore the lead numbers. Just go for connecting cylinder 1 spark plug to output 1 of the coil and so-on.
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Old 12-09-2016   #13
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Re: Fiat punto grade 1.4 sounds really bad

Quote Originally Posted by brickfoot View Post
Ignore the lead numbers. Just go for connecting cylinder 1 spark plug to output 1 of the coil and so-on.

Ah got you, I have tried this when I changed the leads and the coil. When the the problem started. Even does it when I reverted to the old coil and leads
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Old 12-09-2016   #14
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Re: Fiat punto grade 1.4 sounds really bad

So I've managed to get the car running and it doesn't vibrate violently. It now however sounds like a diesel still and Judders slightly. Is this a misfire?
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Old 12-09-2016   #15
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Re: Fiat punto grade 1.4 sounds really bad

Quote Originally Posted by Qwerty91q View Post
So I've managed to get the car running and it doesn't vibrate violently. It now however sounds like a diesel still and Judders slightly. Is this a misfire?
Did you disconnect anything else? the VVT solenoid perhaps?
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