Revo CAI stalling issues

Rob C

Rob C

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I fitted my new Revo CAI last night but now the car doesn't seem to idle properly all the time. And when pulling up to a junction with the clutch down and putting it into first the revs just die and the car stalls. Doesn't splutter or anything, just dies.

Anyone have any ideas as it's driving me crazy as it's become undrivable in start stop town situations?
 
Is the MAF fitted correctly,and the wiring undamaged?

If there any leaks around it,or it's been damaged when being transplanted to the new intake,idling issues could occur,and the wiring/connector aren't exactly Mil-spec either.
 
Thanks Alex, I should have said I had it fitted as I'm not very technically minded but I will take a look but it looked like it was fitted ok when I looked last night.
 
It's pretty delicate and the wiring is frankly rubbish.

As the only thing you've changed is the intake,the MAF is a prime suspect unless you've dislodged anything else.

Is the return hose from the DV fitted correctly?
 
All the wires look ok to me and MAF seems to be fitted ok. I've attached a photo so people can confirm it all looks ok?
Image
 
It does look ok.

That leaves possible damage to the MAF itself or a hose loose somewhere?

The best next step is to log it and find any fault codes.
 
audi upgrades
I have checked all the hoses I can and it all seems OK but I am going to get the person who fitted it to take a look later on this week.

In the mean time I didn't find any fault codes that seemed relevant to the issue?

09-Cent. Elect. -- Status: Malfunction 0010
2E-Media Player 3 -- Status: Malfunction 0010
37-Navigation -- Status: Malfunction 0010
42-Door Elect, Driver -- Status: Malfunction 0010
52-Door Elect, Pass. -- Status: Malfunction 0010
56-Radio -- Status: Malfunction 0010

Hopefully I have attached a YouTube video of how the revs settle when they drop, I'm pretty sure before it just dropped to the idle rpm and didn't bounce around. Sometimes the revs drop completely and the engine stalls.



Could this be unrelated to the CAI and be a coincidence it happened at the same time?

Any feedback would be appreciated
 
Was the battery disconnected while he was working on the car?

Also forgot to ask if it's been mapped?
 
No the battery was left connected as far as I know.

Yes I believe so but don't know who by as it was mapped when I bought it even though it was advertised as standard.
 
I think you're going to have go and get it logged to find out what's going on.
 
I thought that would be the case, it's trying to find somewhere that is relatively local and trust worthy to do the work.

I think I will wait to get it checked over by the guy who fitted it first to make sure its all as it should be.

Then maybe refit the original air box to see if the problem re occurs. That way I will be able to eliminate if its the CAI that is causing the issues or something else.
 
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Is the CAI connection onto the turbo good.
It's a little tight down there and can be a little tricky removing and refitting.
Have they used the oem clip on the hose or a jubilee clip?
 
Also have you tried running the car with the maf disconnected at all?
 
I believe so, the car is going back to the guy tomorrow and I will get him to check everything people have suggested.

-Ju- said:
Is the CAI connection onto the turbo good.
It's a little tight down there and can be a little tricky removing and refitting.
Have they used the oem clip on the hose or a jubilee clip?
Click to expand...

We fitted it as per the instructions and I think it was the OEM clip? would you recommend replacing it with a jubilee clip?

-Ju- said:
Also have you tried running the car with the maf disconnected at all?
Click to expand...

I haven't no, without sounding stupid, what would this prove? (My technical knowledge doesn't stretch that far)
 
Rob C said:
I believe so, the car is going back to the guy tomorrow and I will get him to check everything people have suggested.



We fitted it as per the instructions and I think it was the OEM clip? would you recommend replacing it with a jubilee clip?



I haven't no, without sounding stupid, what would this prove? (My technical knowledge doesn't stretch that far)
Click to expand...

The clip can be a tricky little ****** to get on and as this is after the maf, any air getting in here will not be calculated and will affect the mixture.
Disconnecting the maf will take it out of the loop and the ecu will revert to predetermined values. It can help to diagnose a faulty maf or a leak
 
-Ju- said:
The clip can be a tricky little ****** to get on and as this is after the maf, any air getting in here will not be calculated and will affect the mixture.
Disconnecting the maf will take it out of the loop and the ecu will revert to predetermined values. It can help to diagnose a faulty maf or a leak
Click to expand...

Thanks, I will give it a go and see how I get on!
 
Took the car to the guy who fitted the CAI (who is a good friend of mine). Checked all hoses for leaks, nothing. Checked the MAF, all OK.

Ended up putting the original engine cover/air box back on and it's back to normal, no more idling issues.

So I'm guessing this has something to do with the unknown map that is on the car? And the only way around this is to get it re mapped?
 
Rob C said:
Took the car to the guy who fitted the CAI (who is a good friend of mine). Checked all hoses for leaks, nothing. Checked the MAF, all OK.

Ended up putting the original engine cover/air box back on and it's back to normal, no more idling issues.

So I'm guessing this has something to do with the unknown map that is on the car? And the only way around this is to get it re mapped?
Click to expand...

Possibly.....best way is still to log it and find out what it's doing.

Or....different map,CAI and proper setup.
 
S3Alex said:
Possibly.....best way is still to log it and find out what it's doing.

Or....different map,CAI and proper setup.
Click to expand...

Can you 'log it' using VCDS? Although I think this may be a bit beyond me, even if I did manage to do it the result probably wouldn't mean much to me. May just leave the CAI off for the time being, wait until I have a bit more money and get someone to sort it properly.
 
Rob C said:
Can you 'log it' using VCDS? Although I think this may be a bit beyond me, even if I did manage to do it the result probably wouldn't mean much to me. May just leave the CAI off for the time being, wait until I have a bit more money and get someone to sort it properly.
Click to expand...

I'm not a VCDS expert,but that will give you fault codes etc rather than a lot of raw engine data.

The best way is to have it hooked up to a laptop and look at what the fuelling,timing etc are doing whilst the engine is running.
 
S3Alex said:
I'm not a VCDS expert,but that will give you fault codes etc rather than a lot of raw engine data.

The best way is to have it hooked up to a laptop and look at what the fuelling,timing etc are doing whilst the engine is running.
Click to expand...

Thanks Alex, you've been a great help!
 
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Rob C said:
Thanks Alex, you've been a great help!
Click to expand...

If only because I've been here a while and been through the process of sorting weird problems a few times too!

Worst for aggro was dealing with a throttle body with incorrect load factor correction.
Car basically thought it was pulling load all the time,so it was running about 25% overfuelling....

Took 2 cars running together,and both hooked up to laptops to find that out.
 
The only thing I can think of is if the little rubber seal on the maf sensor has stuck to the engine cover so when fitted to the cai it's drawing air?
 
I'm pretty sure everything was transferred over

I don't know how trust worthy it is but we did a smoke test on the intake, taking the hose off at the DV end and putting smoke in from there. The only place smoke came out was from the cone filter.
 
I had this exact same problem, When I removed my Forge Twintake and replaced it when my Revo one I have now, I was totally baffled as I had only changed a performance filter for a performance filter.

I had a all kinds of fault codes, And spent a little while making sure everything and all was ok no leaks etc, All connections plugged in, I cleared all the codes and drove the car again to see if it would sort itself out but it never!! I unplugged the MAF and everything became fine so I knew I was in the right area at this point, A friend at work has a 2.0L Octavia so I checked his MAF and it was the same as mine so I swopped it over plugged it in and hey presto it was fixed :) So I ordered a new one. I would definitely look at the MAF and if you can try swopping it with another one, I still don't know why or how mine ******** up but they are very temperamental.
 
Craig-P said:
I had this exact same problem, When I removed my Forge Twintake and replaced it when my Revo one I have now, I was totally baffled as I had only changed a performance filter for a performance filter.

I had a all kinds of fault codes, And spent a little while making sure everything and all was ok no leaks etc, All connections plugged in, I cleared all the codes and drove the car again to see if it would sort itself out but it never!! I unplugged the MAF and everything became fine so I knew I was in the right area at this point, A friend at work has a 2.0L Octavia so I checked his MAF and it was the same as mine so I swopped it over plugged it in and hey presto it was fixed :) So I ordered a new one. I would definitely look at the MAF and if you can try swopping it with another one, I still don't know why or how mine ******** up but they are very temperamental.
Click to expand...

Thanks for the info Craig, I will definitely give this a go when I get around to fitting the CAI again!
 
I think the MAF is a pain at times.

When it works it's fine but troubleshooting problems with it and things like the PCV seem to be the TFSi's Achilles heel.
 
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So a little update on this. Just had the CAI put back on with a brand new MAF and its exactly the same :-(

I guess that eliminates the MAF.
 
Just a little update as I know there has been a few discussions regarding the same issue.

I fitted a VWR CAI this evening and it has the same issue as the Revo so I guess it eliminates the Revo being problematic. I will say the VWR is much quieter and more to my taste.

I guess the next thing is to get the car mapped again so it runs properly with the CAI.
 
Considering what you've already had checked out and discussed with Alex, it sounds like it could be due to the fact that the car was remapped with the standard air filter on and then you've put on a new intake after which has an increased air flow. So the ECU is trying to run using old parameters which is not going to function properly, so getting it mapped with the CAI is your best bet.

I had my Revo CAI fitted and then a Revo stage 1 remap both done on the same day by a VAG specialist (VAS Motion) and have had no issues whatsoever.
 
Yeah I guess the logical thing to do is to get it mapped with the CAI on.

But speaking to various people they have said adding a CAI to a standard or stage 1 car shouldn't cause these problems but on the flip side I can see the potential reasons why it would has issues.
 
Rob C said:
Yeah I guess the logical thing to do is to get it mapped with the CAI on.

But speaking to various people they have said adding a CAI to a standard or stage 1 car shouldn't cause these problems but on the flip side I can see the potential reasons why it would has issues.
Click to expand...
Get yaself down to amd and get it sorted before show season mate
 
Last night I replaced the DV with a revision D and also replaced the PCV and touch wood the stalling issue has gone.

The old DV looked OK so I would say it was the PCV that was causing the problem.

Thought I would post this as I know there were a couple of people with similar problems with CAIs.
 
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