Hi Guys ,
a bit more info/advice needed please,
on cold start up my car sounds like a bag of spanners , its only when its cold and settles down within a minute or two or within a few hundred yards of pulling away , not sure if this is normal or not but my S8 and S6 weren't this noisy .
i have checked the oil and we're fine there , i have official Vagcom from the days of owning my other 2 on and it threw up fault codes "miss fire on cylinder 3 and cylinder 8 . So i'm wondering if this could be coil packs / plugs and contributing to the problem.
once the car is warm , the engine sounds sweet and pulls like a train with no flatspots
Any ideas or anyone had similar issues ??
cheers
Dave
Cold Start up issues
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Davie Bow
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Cold Start up issues
Current : Audi RS6 Avant (C5)
Ferrari 348 TB
Lotus Elan SE
VW Golf GTI Cab MK1
VW T4 Campervan
Toyota Celica GT4 ST165
Mazda MX5 MK1
Daimler V8 250
Ferrari 348 TB
Lotus Elan SE
VW Golf GTI Cab MK1
VW T4 Campervan
Toyota Celica GT4 ST165
Mazda MX5 MK1
Daimler V8 250
Re: Cold Start up issues
Could be misfire when cold. Maybe an SAI problem causing weak mixture / air leak when activated.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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Davie Bow
- Neutral
- Posts: 29
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Re: Cold Start up issues
What's the SAI ? , cheers
Current : Audi RS6 Avant (C5)
Ferrari 348 TB
Lotus Elan SE
VW Golf GTI Cab MK1
VW T4 Campervan
Toyota Celica GT4 ST165
Mazda MX5 MK1
Daimler V8 250
Ferrari 348 TB
Lotus Elan SE
VW Golf GTI Cab MK1
VW T4 Campervan
Toyota Celica GT4 ST165
Mazda MX5 MK1
Daimler V8 250
Re: Cold Start up issues
= Secondary Air Injection
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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Weiß-sechs
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Re: Cold Start up issues
The rattle is probably unrelated to the fault codes. I had this with mine from cold....sounded like a million miler taxi for half a minute or so, turned out to be the cam chain tensioner. Both cams on each bank are connected by a chain and the tensioner for these is hydraulic; they wear over time and miles so don't tension the chains correctly until the oil has thinned enough. From memory, off side is an easy fix, near side a biatch....or vice versa 
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Davie Bow
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- Posts: 29
- Joined: Mon May 29, 2017 8:00 am
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Re: Cold Start up issues
Thanks guys ,
I'm gonna do the cam belt again anyway just for my own piece of mind so will do the thermostat and chain tensioners at the same time .
What's the situation with these secondary air intakes , are they likely to need replacing or can i just remove and clean them ?
I'm gonna do the cam belt again anyway just for my own piece of mind so will do the thermostat and chain tensioners at the same time .
What's the situation with these secondary air intakes , are they likely to need replacing or can i just remove and clean them ?
Current : Audi RS6 Avant (C5)
Ferrari 348 TB
Lotus Elan SE
VW Golf GTI Cab MK1
VW T4 Campervan
Toyota Celica GT4 ST165
Mazda MX5 MK1
Daimler V8 250
Ferrari 348 TB
Lotus Elan SE
VW Golf GTI Cab MK1
VW T4 Campervan
Toyota Celica GT4 ST165
Mazda MX5 MK1
Daimler V8 250
Re: Cold Start up issues
Well that sounds painful.
The SAI can be deleted, it just fills with water anyways. I can't remember if it needs to be mapped out or not.
No matter where you go, there you are.
Re: Cold Start up issues
It does. I tried it with SAI removed but no changes to the map.
There's 2 elements that need to be mapped out, ideally, to allow you to remove all the gubbins.
Or, if you just remove the pump & the valves - blanking off the ports in the head, it's a simpler change to the map and you can just leave the solenoid valve on top of the intake manifold electrically connected (but not connected to the manifold etc)
I did the latter.
There's 2 elements that need to be mapped out, ideally, to allow you to remove all the gubbins.
Or, if you just remove the pump & the valves - blanking off the ports in the head, it's a simpler change to the map and you can just leave the solenoid valve on top of the intake manifold electrically connected (but not connected to the manifold etc)
I did the latter.
"not a professional engineer, mechanic and mechanist"
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