Competition Time.

[Frenchy]

Righto Fellas,
A small prize sent to you if you can figure this out,first one to give the right answer will have this car related (useful) prize sent to them !
Story:
Car was taken apart last year to fit a Lambda probe into the exhaust cross over pipe to run an AFR gauge, snapped off various studs in the turbo outlet pipe so a strip down was on the books, then put back together, since then i have had an intermittent fault, now and again a backfire on boost and a hesitance to pull, back off and it cleared ?
Eventually last week i thought i had it sussed, i found a cracked inlet tube on the one way vacuum valve, so replaced and everything was fine !
Need to put a few miles shakedown on now as i have just changed belts with the Germany trip coming up, today no misfire but still a hesitance intermittently to pull, but fine most of the time, got to be fuel or ignition which has been checked and double checked ?
So bonnet up again and i have sorted it hopefully...........what was it ?
Answers on a postcard !
A prize as stated to the first correct answer []

Love this forum []

 

[Eldavo]

Left the vacuum tube off the top of the wastegate?

 

[George Elliott]

Dizzy or a HT Lead arcing

good that you located the problem

it is a great forum

George

 

[Frenchy]

Wrong answers try again Chaps.

 

[tscaptain]

Tesco fuel.........?[]

 

[pauljmcnulty]

Left the handbrake on? Rotor arm? Family of mice in the air filter?

 

[George Elliott]

has to be relevant to the probe lads.....


OK - faulty probe....?

George
944t

 

[loc944]

You were backing off the throttle because you were scared of too much Boost!

Alan.

 

[George Elliott]

spark plug up the left

 

[Frenchy]

Keep guessing lads, turned out that by having things apart everything pointed to something I hAd done, this was the case with the backfire but the hesitancy turned out to be unrelated.
A clue tomorrow

 

[edh]

throttle cam / cable snagging on a jubilee clip?

 

[barks944]

Did you actually put it in the crossover pipe? Got a feeling your sensor won't last very long...

 

[frankydoom]

OIL FILLer cap was missing/loose or faulty thrttle switch

 

[Frenchy]

No still no correct answer, Barks it was further up the downpipe from the turbo outlet, it is now fitted in the crossover pipe under the transmission tunnel, how will this affect longevity ?

 

[944 man]

Fierce heat. Its always a compromise on a turbocharged car.

 

[Frenchy]

Barks, it is on the outlet side not the feed. I felt that the bung from Porsche was too near the Turbo housing.

 

[944Turbo]

Sounds like split rubber coupler to the intercooler, but if its in the area of the exhaust

One of the bungs was loose?
missing or loose exhaust 'gasket' coupler

 

[George Elliott]

OK,

if not the suggestions above......

you found it....it was simple.....bonnet up....quick fix......

......the one way valve in the vacuum system was installed in the reverse direction.

(hesitation was probably due to consequent fuel damper fluctuating....)

if not

I give up[]

George
944t

 

[Masher]

You really know how to get people hooked, don't you!

As a complete non-techie and knowing not how these things work, the question I am asking myself is whether something was put back into the hole the Lambda sensor used to be in. My previous thought ref sticking throttle appears to have been dismissed already.
Mick

 

[Eldavo]

ORIGINAL: George Elliott

OK,

if not the suggestions above......

you found it....it was simple.....bonnet up....quick fix......

......the one way valve in the vacuum system was installed in the reverse direction.

(hesitation was probably due to consequent fuel damper fluctuating....)

if not

I give up[]

George
944t

Correct or not, I really hope it's this one!!!