sluggish 1.8t

Yorkshire GOC · 19th April 2019, 12:20

Hi -for the last 2 weeks my car has been sluggish mainly at low revs -

OBD -shows no faults or misfires
No dark smoke
No turbo whine

So am i looking at the possible failure of the pierburg boost valve ?

Strangely enough the car engine sound has got much throatier and sounds similar to when my exhaust manifold gasket failed - i notice on Rimmers site there is turbo/exhaust gasket - if this is failing would it cause the turbo to under perform - and of course cause the throatier sound?

Sheraton · 19th April 2019, 17:02

doesn't sound like a failing Boost Control - when this Fails the Car will NOT be "Sluggish" - more "Hyperactive", until fuel shut off

an Exhaust leak should be easy enough to diagnose - may be worth checking all the Service parts, Air Filter condition, plugs, Oil, leads etc.? - I've been looking at changing the Leads on my Car for Magnecore (?) if i recall the brand - I've heard of these being an improvement for a K-Series - I'm interested to try these with Standard Plug Gap(1.0mm) and see how they fare

What do you have the Spark Plug Gap set at ? - I'm sure I'm at 0.60mm

Id be inclined to throw a shot Redex in the Fuel for Good Measure regardless

Paul.

Yorkshire GOC · 19th April 2019, 17:43

Hi -plugs are at 1.00mm and to be fair in my 6 years of ownership its not been an issue. Service due next month - and i run her on Forte as opposed to redex. I am leaning more toward the exhaust gasket on the turbo failing - the engine sounds like i am driving a V8 -which was the same when the exhaust manifold gasket went - looking on the net the turbo gasket does wear out.

Sheraton · 19th April 2019, 19:58

Quote:

Originally Posted by Yorkshire GOC

Hi -plugs are at 1.00mm and to be fair in my 6 years of ownership its not been an issue. Service due next month - and i run her on Forte as opposed to redex. I am leaning more toward the exhaust gasket on the turbo failing - the engine sounds like i am driving a V8 -which was the same when the exhaust manifold gasket went - looking on the net the turbo gasket does wear out.

Sounds a Good call - Exhaust leak affecting the oxygen sensor readings at low RPM then becoming insignificant as Engine speed and Boost Increase ?

i'd assume this could cause an AFR fueling issue ? - (if so would it run lean or rich?)

hope you get to the source of the issue

Paul.

Yorkshire GOC · 21st April 2019, 11:55

will advise when new gasket fitted if that has solved the issue.

19th April 2019, 12:20	#1
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,061 Thanks: 1,842 Thanked 623 Times in 469 Posts	sluggish 1.8t Hi -for the last 2 weeks my car has been sluggish mainly at low revs - OBD -shows no faults or misfires No dark smoke No turbo whine So am i looking at the possible failure of the pierburg boost valve ? Strangely enough the car engine sound has got much throatier and sounds similar to when my exhaust manifold gasket failed - i notice on Rimmers site there is turbo/exhaust gasket - if this is failing would it cause the turbo to under perform - and of course cause the throatier sound? __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

19th April 2019, 17:43	#3
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,061 Thanks: 1,842 Thanked 623 Times in 469 Posts	Hi -plugs are at 1.00mm and to be fair in my 6 years of ownership its not been an issue. Service due next month - and i run her on Forte as opposed to redex. I am leaning more toward the exhaust gasket on the turbo failing - the engine sounds like i am driving a V8 -which was the same when the exhaust manifold gasket went - looking on the net the turbo gasket does wear out. __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

21st April 2019, 11:55	#5
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,061 Thanks: 1,842 Thanked 623 Times in 469 Posts	will advise when new gasket fitted if that has solved the issue. __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

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19th April 2019, 17:02	#2
Sheraton Posted a thing or two Rover 75 1.8t Join Date: Oct 2015 Location: Edinburgh Posts: 1,377 Thanks: 384 Thanked 409 Times in 267 Posts	doesn't sound like a failing Boost Control - when this Fails the Car will NOT be "Sluggish" - more "Hyperactive", until fuel shut off an Exhaust leak should be easy enough to diagnose - may be worth checking all the Service parts, Air Filter condition, plugs, Oil, leads etc.? - I've been looking at changing the Leads on my Car for Magnecore (?) if i recall the brand - I've heard of these being an improvement for a K-Series - I'm interested to try these with Standard Plug Gap(1.0mm) and see how they fare What do you have the Spark Plug Gap set at ? - I'm sure I'm at 0.60mm Id be inclined to throw a shot Redex in the Fuel for Good Measure regardless Paul.