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Discussion Starter · #1 ·
This video https://youtu.be/oPI55lAhrcQ shows my 164 cloverleaf idling after having pulled and rebuild the engine, thoughts and opinions would be appreciated on the high idle (2000 rpm) and what sounds like possibly unburnt fuel popping and banging.

Day off today so wont be back to the car till tomorrow, gathering views before tackling the problem.

Thanks in advance.
 

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Hey Rodger, hope you're well.

This is probably no help whatsoever but............When CM Garage Services done the belt on my 2.5 a few years back the car was idling at about 1100 rpm and running lumpy as hell when I got it back. They thought it was needing re-timed so pulled it all apart again to check but that side of things was fine. After much searching they discovered that the front bank of spark plugs were fairly new but the rears were shot. They swapped in a set of new plugs (all 6) and everything was running as normal again. The reason they never changed the plugs as part of the belt service - according to the service history they had been renewed by an Audi specialist 2 months before by the previous owner. They obviously couldn't be arsed with the hassle of the rears so left them in but charged the poor guy for the six plugs and the labour!

Like I say, probably no help but you never know!
 

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That doesn't sound at all right! My first guess would be at least one cam being a tooth out. Acceleration sounds crisp enough though. Second thought would be a big air leak somewhere.
 

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Discussion Starter · #4 ·
Hey Rodger, hope you're well.

This is probably no help whatsoever but............When CM Garage Services done the belt on my 2.5 a few years back the car was idling at about 1100 rpm and running lumpy as hell when I got it back. They thought it was needing re-timed so pulled it all apart again to check but that side of things was fine. After much searching they discovered that the front bank of spark plugs were fairly new but the rears were shot. They swapped in a set of new plugs (all 6) and everything was running as normal again. The reason they never changed the plugs as part of the belt service - according to the service history they had been renewed by an Audi specialist 2 months before by the previous owner. They obviously couldn't be arsed with the hassle of the rears so left them in but charged the poor guy for the six plugs and the labour!

Like I say, probably no help but you never know!
Hi Scott

I'm in the process now of swapping out the plugs along with a spare set of coil packs and harness, should have done it before i put her back together, I'll post the results in a couple of days.

The high RPM was down to my mixing up a couple of the plugs, one being the throttle body one :( hey ho complex beastie.

Still the popping remains, but only when warm after around 20 - 30 seconds... we shall see.

That doesn't sound at all right! My first guess would be at least one cam being a tooth out. Acceleration sounds crisp enough though. Second thought would be a big air leak somewhere.
Hi Avocet... I'm not subscribing to the timing being out at this point, the engine was rebuilt on the bench with the correct tools by someone who knows the busso inside and out, of course I wont rule it out, for now going through the more obvious things in the hope that all is well, I'll post my findings in a couple of days.

Both, thanks for your comments, much appreciated.
 

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Discussion Starter · #6 ·
Great - keep us posted. Fingers crossed that the plugs, coil packs and harness do the trick. :thumbup:
Happy to report I have a sweet Busso :)

New plugs, swapped out loom and coil packs... all good :)

Managed to break the egr valve in the process, this has now been removed and replaced with a blanking plate :)

Next up bleed the pesky clutch which is new master slave and flexi pipe... proving a pita thus far :)
 

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Discussion Starter · #8 ·
Brilliant - glad you got the engine sorted Rodger. It's gonna be one sorted 164 when it's done.
Thanks Scott

It's a labour of love and will remain a work in progress, will be nice to put some miles on her and look ahead to hopefully getting the suspension sorted, unsure of whether to go stock (expensive) or to seek out Koni's... not ruling out having my shocks refurbished if I can find someone to undertake that task.

Next a little further along will be throttle bodies... that will be fun with a bespoke harness the order of the day :)

How is the engine working out in your 166 ? last i heard from Derek it was sweet ...

Rodger
 

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Brilliant - glad you got the engine sorted Rodger. It's gonna be one sorted 164 when it's done.
Fur Coat tay add yesterday oan Back tay ra Future Day "GREAT SCOTT". :censored: :biglaugh:

My how you have come on since thom thermostat change awe those years ago.:yes:

But my timing is oot unlike AS's.

Top Job AS

Pomeo
 

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Thanks Scott

It's a labour of love and will remain a work in progress, will be nice to put some miles on her and look ahead to hopefully getting the suspension sorted, unsure of whether to go stock (expensive) or to seek out Koni's... not ruling out having my shocks refurbished if I can find someone to undertake that task.

Next a little further along will be throttle bodies... that will be fun with a bespoke harness the order of the day :)

How is the engine working out in your 166 ? last i heard from Derek it was sweet ...

Rodger
Engine is great Rodger, thanks. Runs like a dream and doesn't miss a beat. I owe you a few beers for that one. I was up at their unit last weekend chatting to David and the boys have gone all GTV these days. 2 x V6s, one with nitros!!!!

If you ever need advice/help with bits for the 164 you should pop into JM in Falkirk and have a chat with John. He spent many years looking after and rebuilding Enrico's QV and was always coming up with solutions to unique problems because of obsolete parts. He ended up fabricating various bits and pieces for it over the years if I mind right.

Did you ever move the Proteo 166 on?
 

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Have you checked the air flow meter by pass screw as as they wear people trnd to wind them right in to compenssate.
If you have the money I would buy a new one as they never normally get replaced.
The normal issue isthe little circuit board inside the black box on the top of the AFM. The track it runs the throttle setting on gets very worn.
If you search youtube "porsche 944 air flow meter " you will understand a bit better. Yes it uses the same AFM.
 
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