16v Kangaroo fixed. Worth a KB piece?

[TrentSC 0]

It's taken me a while, but my mildly problematic 2.0 16v kangaroo problem appears now to have been sorted. Having tried out a number of different possible issues, it boiled down to a split in the intake air duct which, when replaced, solved the problem completely.

 

Having done a lot of searching on this board, it seems that this is not the rarest of problems and that there's a large number of possible solutions. I was wondering whether it would be useful to pool the information from the myriad of threads on the subject to create a piece for the knowledgebase which gives a walkthrough of possible causes and solutions? I'd be happy to act as a central point of information, contributing my own experiences and working with others far more skilled than me.

 

Searching an otherwise excellent forum such as this can be problematic and fruitless if one isn't certain what to search for, and it seems to this fairly new arrival on this board that the knowledgebase is underused, and this could be a useful resource for people like me who are newly arrived in the Corrado community.

 

What's the general view? If there's a positive response, I'm happy to start work on it. And if someone's already started, I'm happy to add my 2p...

 

Cheers!

[Jim 2]

We're always really keen for new KB items, especially as the valver gets overlooked quite often whilst people concentrate on G60 and (more often) VR6 based articles.

 

Go for it! :)

[TrentSC 0]

We're always really keen for new KB items, especially as the valver gets overlooked quite often whilst people concentrate on G60 and (more often) VR6 based articles.

Go for it! :)

 

OK, let's give it a go.

 

Right, so who has experience of this problem, and what did you do to try and fix it? What worked, what didn't, what drove your decisions about what order to try things?

 

All experiences are very welcome, even if you haven't fixed it yet! Post here, or PM me and I'll add your own experience to the mix.

[Yandards 0]

As Jim said, always worth doing an article.

 

Pics are good, and I always assume that I am working with someone who has not picked up a spanner before when writing one.

 

You could do a general topic on the subject of vacuum leaks (as this is what this is) and likely locations/failure points to check for rough running, a trouble shooting chart etc.

[TrentSC 0]

As Jim said, always worth doing an article.

Pics are good, and I always assume that I am working with someone who has not picked up a spanner before when writing one.

You could do a general topic on the subject of vacuum leaks (as this is what this is) and likely locations/failure points to check for rough running, a trouble shooting chart etc.

 

Agreed on the pics - they always illuminate a point very well.

 

It's not just vacuum leaks, though. I've spoken to several people who experienced similar problems and found the causes elsewhere. They include the rotor arm, HT leads, plugs, fuel filter, lamda probe, fuel pump, fuel pressure regulator... That's one of the reasons why i think a KB piece on this would be useful - go through each item one by one, talk about minor differences in symptoms, ease & cost of repair, that sort of stuff.

[Yandards 0]

As Jim said, always worth doing an article.

Pics are good, and I always assume that I am working with someone who has not picked up a spanner before when writing one.

You could do a general topic on the subject of vacuum leaks (as this is what this is) and likely locations/failure points to check for rough running, a trouble shooting chart etc.

 

Agreed on the pics - they always illuminate a point very well.

 

It's not just vacuum leaks, though. I've spoken to several people who experienced similar problems and found the causes elsewhere. They include the rotor arm, HT leads, plugs, fuel filter, lamda probe, fuel pump, fuel pressure regulator... That's one of the reasons why i think a KB piece on this would be useful - go through each item one by one, talk about minor differences in symptoms, ease & cost of repair, that sort of stuff.

 

Excellent, 16v rough running troubleshooting guide sounds like a good title.

[TrentSC 0]

Excellent, 16v rough running troubleshooting guide sounds like a good title.

 

Cool - sounds like we have a title. Now, all we need to do is to start filling it...

 

I'll get started with completing that list of possible causes.

[larkin 0]

any update on the KB entry for the 16v rough running troubleshooting guide/vacuum leaks etc?

[n3p 3]

Sounds good, will keep my eye on this ;)

[TrentSC 0]

any update on the KB entry for the 16v rough running troubleshooting guide/vacuum leaks etc?

 

OK, here's the first pass. I'm very happy for input, corrections, amendments and additions, especially to the terminology!

 

Problem

You get into your shiny Corrado, fire up the engine, drop it into first and. As you pull off, the power drops off significantly before either picking up again or stalling. The symptoms have been variously described as stuttering or kangarooing.

 

Background

The Corrado

[n3p 3]

good job!

[TrentSC 0]

good job!

 

Thanks, but it needs some work. I'd appreciate some input from a technical perspective, especially on the MAF sensor...

[larkin 0]

cheers trentSC, some good info there, will be folllowing this thread..

 

going to try and trace a possible vacuum leak this weekend so this should be a help

 

one tip i read on another post somewhere was that you can spray a little carb cleaner on the various vacuum lines between the filter and the tb. if there is a vaccum leak then you will hear the engine change tone / splutter when the carb cleaner enters the system. might be worth adding to the kb..

[Trickygti 0]

I have problems with my 9A kangarooing slightly when cold, but after carrying out a fault code read with VAS5052 it was found that the ECU is not recognising when the TB is in Idle position, I've carried out a check on the micro switch and all seems to be fine so I'm assuming its the wiring to the ECU. Haven't got round to replacing the wire yet though as I dont have a Corrado wiring diagram. If anybody has one for the 9A and could possibly email me a copy I'd be very appreciative.

[boost monkey 0]

I thought kids were taught in school these days about how bad the vw 16v intake systems are? :shrug:

[easypops 8]

My bad idle was caused by 2 broken wires(burst inside the plastic covers) on the plug that attaches onto the throttle potentiometer.....only took about a year to find :D ....that was after a new MAF, distributor, leads, throttle potentiometer, fuel pump, and a replacement throttle body and many times cleaning the ISV .

 

This is a pic of the plug.....usually attached to the throttle body

[boost monkey 0]

Took you about a year to find?!

 

continuity tests on a multimeter for the extreme winnage.

[easypops 8]

Took you about a year to find?!

 

continuity tests on a multimeter for the extreme winnage.

 

Mate, I'm a picture framer.....before i had a corrado , when the car went wrong it went to a garage.....happy to get my hands dirty now......the problem that took a year to find was missed by 3 garages including a supposed vw specialist, so i was quite pleased that i was able to find the problem.....which was intermittent so didn't always annoy

[boost monkey 0]

understandable, but a lightbulb and two wires would work just as well. it's school-level physics :shrug:

[TrentSC 0]

My bad idle was caused by 2 broken wires(burst inside the plastic covers) on the plug that attaches onto the throttle potentiometer.....only took about a year to find :D ....that was after a new MAF, distributor, leads, throttle potentiometer, fuel pump, and a replacement throttle body and many times cleaning the ISV .

 

This is a pic of the plug.....usually attached to the throttle body

 

Would you be willing to put a few words down on paper so we can update the appropriate section of this draft Knowledgebase Article?

[easypops 8]

My bad idle was caused by 2 broken wires(burst inside the plastic covers) on the plug that attaches onto the throttle potentiometer.....only took about a year to find :D ....that was after a new MAF, distributor, leads, throttle potentiometer, fuel pump, and a replacement throttle body and many times cleaning the ISV .

 

This is a pic of the plug.....usually attached to the throttle body

 

Would you be willing to put a few words down on paper so we can update the appropriate section of this draft Knowledgebase Article?

 

yes , no worries mate.......do you mean actual paper? or put it on a word document? let me know what you want exactly and i'll be happy to help.

[easypops 8]

understandable, but a lightbulb and two wires would work just as well. it's school-level physics :shrug:

 

That sounds good....so one end goes at the faulty plug and the other goes where? in the ecu somewhere i guess?

Well I for one wont be doing any tampering in the ecu. and i dont think you'll find that many people on this forum who would be prepared to start messing about in there.....but i may be wrong.

Quite sure there will be no school physics pupils doing it anyway....

I do have a multi-meter by the way :D

[TrentSC 0]

Would you be willing to put a few words down on paper so we can update the appropriate section of this draft Knowledgebase Article?

yes , no worries mate.......do you mean actual paper? or put it on a word document? let me know what you want exactly and i'll be happy to help.

Why don't you put something here? The plan is to create a single point of reference for addressing a specific symptom, so your input would be very valuable.

[boost monkey 0]

ECU? No, not at all.

 

Never mind, I was just trying to state that continuity is a relatively simple thing to check where electrical systems are concerned.

[easypops 8]

ECU? No, not at all.

 

Never mind, I was just trying to state that continuity is a relatively simple thing to check where electrical systems are concerned.

 

No worries mate, the wires were broken inside the plastic sheathing and ,in truth just found it by luck.....I never even thought of checking for continuity as all bad idle problems i had read about on here were to do with the isv, fuel filter, fuel pump, 5th injector, maf, coil ,dizzy........and i had replaced all of these (unplugged the 5th injector).

where would i have checked for continuity?.......only asking as it would be good to know.....and having followed mostly all of your posts, you seem to know the corrado inside out.....having turned one inside out :clap: :D