Will a leaking exhaust flex cause any running issues

[220bhp]

I have a leak from the flexy at the bottom of the 3inch down pipe .
Will this cause any running issues.
Just trying to rule this out as I am having
Random boost cuts and running issues again.
I have done a boost leak test, and vacuum test,
finding no leaks .
Changed plugs, change maf and fitted new plug.
No codes.
The cuts are intermittent with good burst of good performance then mor
Cuts

[adam g]

A leak at the bottom of the downpipe won't cause a boost cut. My exhaust effectively vents most of its gas there when the bypass valve is open and it has no effect on engine smoothness at all.


Sent from my D5803 using Tapatalk

[bernsaudi]

Coils wiring, earth points on intake manifold?

[220bhp]

It's an rs2d 3b. Leads and distributor are new
Coil is original earth wires have been checked
,but I will check and lean them again.
This problem is very inconsistent

[newsh]

Will a leaking exhaust flex cause any running issues

Time for new pins in the MAF connector?

How about diverter valve diaphragm? Did you vac check that?

[220bhp]

I fitted a new maf plug John.
changed the turbosmart diverted valve for a forged , still the same

[adam g]

I had a recent issue with an intermittent crank sensor fault that felt like a boost leak. I guess the 3b equivalent is Hall sensor on the dizi , could be worth checking it and associated wiring. Or timing pick up on the flywheel.

Sent from my D5803 using Tapatalk

[newsh]

Will a leaking exhaust flex cause any running issues

Hall sensor in 3B dizzy is equivalent to Camshaft sensor in ABY.

Lou, keep an eye on the rev counter, see if it drops to zero when you get the cut. If so could be ECU wiring or a crank sensor

[220bhp]

I have just been out and tried it John, and
the revs do not drop that much.
The cuts are more frequent now , so it is getting worse
I am going to double check , and do another leak test.

[220bhp]

Spent all afternoon on the car
Done a leak test on the inlet track including blocking the pipe from the n75 to the wastegate. It holds pressure with no leaks .
Went on to test the rest, still with the wastegate blocked of .
Used soapy water . A few bubbles from the back of the ISV witch I have applied epoxy
Before , but hardly anything.
Replaced the n75 with my spare witch I know is ok . But the car is still not lettin me use full throttle, it cuts at 1.5.
My ,son says it's boosting more than the map, which was done by PRJ , and l am sure when he mapped it it was in the reagent of 1.8 to 2bar.
Can't get hold off him to check.
If anyone has had there rs2 speck 3b live mapped by him maybe they could verify this.
I have not had a chance to check the wireing to the n75, only a visual check.
I will have another go tomorrow and try to check the codes.
Othher than that I am stumped once again.nay advise is much appreciated.

[newsh]

PRJ RS2 map will be 1.8Bar I would think.

[newsh]

And no codes??

[newsh]

Check static timing.

[220bhp]

Thanks John . I had It in mind that it was 1.8.
I am having trouble reading the codes at the moment
Proberbly the cable I will have to dig out my le.
I will check the timing tomorrow .
Would an issue with the timeing cause a cut.

[adam g]

Does it cause the engine to cut out completely or just lose boost/power?

Sent from my D5803 using Tapatalk