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Author Topic: Weird behaviour when cold  (Read 972 times)

Offline alexmccabe

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Weird behaviour when cold
« on: October 28, 2013, 01:55:30 pm »
My car exhibits some weird behaviour when the engine is cold. If I hold the throttle pedal at one place whilst driving just after turn on, the car will kangaroo back and forth, sometimes quite violently. It's as if I am in a car with someone that doesn't know how to use the clutch properly. Once warmed up this doesn't happen.

I've also noticed weird idle when cold - mid temp. It kinda feels like it's misfiring on a cylinder, but not as jumpy, and it is quite infrequent. In my MK4 2.0 GTi, this was caused by the ignition coilpack, but it was a lot more aggressive.

What could be causing this behaviour? It is going in for a diagnostic tomorrow, but I am wondering if I can go into it with a bit of knowledge before hand.
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MK5 Golf GTi 197BHP Tornado Red

Offline Tortaruga

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Re: Weird behaviour when cold
« Reply #1 on: October 28, 2013, 09:52:40 pm »
That sounds like a fuelling issue. Have you replaced your cam follower?
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Offline Tortaruga

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Re: Weird behaviour when cold
« Reply #2 on: October 28, 2013, 09:56:21 pm »
Although a fuel supply issue wouldn't go away when the engine has warmed up. I don't know, sorry.
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Offline alexmccabe

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Re: Weird behaviour when cold
« Reply #3 on: October 28, 2013, 10:53:38 pm »
Quote from: Tortaruga on October 28, 2013, 09:52:40 pm
That sounds like a fuelling issue. Have you replaced your cam follower?

Yeah I replaced the cam-follower, though the old one was barely worn.
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Offline Human Joist

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Re: Weird behaviour when cold
« Reply #4 on: October 28, 2013, 11:39:37 pm »
I have the same symptoms with my dsg gti. I have just changed the sparkplugs as they had been in for 50k and that's improved the situation but now cured it. I was also thinking maybe coilpacks
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Offline alexmccabe

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Re: Weird behaviour when cold
« Reply #5 on: October 29, 2013, 03:43:03 pm »
The service today showed that the spark plugs were rusted and leaking. Got all new ones, but might have to replace one of the ignition coils.
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Offline Human Joist

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Re: Weird behaviour when cold
« Reply #6 on: October 29, 2013, 05:20:05 pm »
Is there a way for testing the coil packs at all
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Offline Tha_Don

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Re: Weird behaviour when cold
« Reply #7 on: October 29, 2013, 06:47:41 pm »
I have the same problem. I've changed the spark plugs but it didn't solve the issue. Let us know if you get it sorted please mate.
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Offline joelee

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Re:
« Reply #8 on: October 29, 2013, 07:33:04 pm »
Have you tried the temp sender unit as that controls the fueling and so on

Sent from my HTC One using Tapatalk
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Offline alexmccabe

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Re: Weird behaviour when cold
« Reply #9 on: October 30, 2013, 10:26:15 am »
Quote from: Tha_Don on October 29, 2013, 06:47:41 pm
I have the same problem. I've changed the spark plugs but it didn't solve the issue. Let us know if you get it sorted please mate.

Will do. It seems to be behaving much better now, but I will keep an eye on it. If you can afford to, replace the ignition coils as well.
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Offline Tha_Don

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Re: Weird behaviour when cold
« Reply #10 on: October 30, 2013, 08:28:46 pm »
Quote from: alexmccabe on October 30, 2013, 10:26:15 am
Quote from: Tha_Don on October 29, 2013, 06:47:41 pm
I have the same problem. I've changed the spark plugs but it didn't solve the issue. Let us know if you get it sorted please mate.

Will do. It seems to be behaving much better now, but I will keep an eye on it. If you can afford to, replace the ignition coils as well.

Cheers mate. That was next on my list actually. Seeing as it's pay day tomorrow I might have to treat her to some  :happy2:

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