Author Topic: Misfiring 1.8t  (Read 2160 times)

Offline mk4Martin

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Misfiring 1.8t
« on: 17 April 2009, 22:30 »
Thought I would ask here as you guys have always been great help on my Golf GTI plus the level of knowledge is not as high on the briskoda site (Dont tell them I said so though)

This on my Octavia vrs 1.8t. I know they are very simular to mk4 1.8t especially the anniversary.

Think I have slight problem.Thing is that first and second gear are a bit 'choppy' in regard to the way that they deliver acceleration at lower revs (say 1k to 2.5krpm) - it can be a bit flat at a given rev, or it can surge ahead, and it seems uneven and inconsistent. This is most noticeable from cold, but is still there once the engine is up to temperature (albeit to a lesser degree). That said, the engine doesn't appear to be down in power and economy remains roughly as it's always been.

I'm wondering whether either thing is just a symptom of a car getting older (it's sitting at 48k right now, and was last serviced in November, so it ought to be okay).

Not the MAF as I have checked
Not the dump valve as I have upgraded to forge 007p
Not remap as it was doing this before and after.

Any Ideas

Offline sambo

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Re: Misfiring 1.8t
« Reply #1 on: 17 April 2009, 22:40 »
Have you checked the coilpacks?
Sam



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Offline mk4Martin

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Re: Misfiring 1.8t
« Reply #2 on: 17 April 2009, 22:52 »
Not a mechanic. Would I need to take it to a garage to check the coil packs ?

Offline RTechUK

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Re: Misfiring 1.8t
« Reply #3 on: 17 April 2009, 23:00 »

A good clean of the throttle body could sort your problem out. A dirty TB will mess all the fuel mapping up it can offset mixture to compensate to for what would be a poor idle, this offset can have a knock on effect across the whole rmp range and cause a slight surge at part throttle.
If  the TB clean dont work and you get stuck you can pop over to Hinckley and we can put your car on the rolling road and carry out some low speed load data logging and try and work out whats going on.

Dont waste your money on paying a garage to plug there pc in to your car to tell you the aint nothjing wrong becasue they cannot log the data.I am sure me or ben can find 15 mins spare to point you in the right direction for free.

Nick



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Offline mk4Martin

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Re: Misfiring 1.8t
« Reply #4 on: 17 April 2009, 23:07 »
Nice one thanks. By the way I have been done some research for a couple of hours and it seems other AUQ engines get this too. Infact it's common but no solutions in any threads.

Offline richw911

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Re: Misfiring 1.8t
« Reply #5 on: 17 April 2009, 23:39 »
Brake light switch........

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Offline RTechUK

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Re: Misfiring 1.8t
« Reply #6 on: 17 April 2009, 23:52 »
Nice one thanks. By the way I have been done some research for a couple of hours and it seems other AUQ engines get this too. Infact it's common but no solutions in any threads.

Would your car be a 2003 build date?

Nick



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Offline mk4Martin

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Re: Misfiring 1.8t
« Reply #7 on: 18 April 2009, 18:39 »
not sure when exactly built but its an 04plate

Offline RTechUK

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Re: Misfiring 1.8t
« Reply #8 on: 20 April 2009, 12:28 »
not sure when exactly built but its an 04plate

Away around this issue is to use an older code from a 2002 build ecu with the same HW.

Nick



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