higher than normal boost before judder

fizzgig656 · 12th August 2012, 19:06

Hi all, I though I sorted a problem a few months ago but have had it happen again today. Normally when cold and in 2nd gear ill pull out of the end of my road and put my foot down. I have the turbo kick in and where I normally feel the peak of boost I feel a little more (asssuming a boost higher than normal) before I get a miss fire, then drive fine.
I believe this to be an ecu instigated miss fire as its sensed an overboost. Both are present in the logs.
Any ideas guys. Is it going to be a stickly wastegate? Faulty boost controller? I'm guessing the higher boost or jolt or rise in temp sorts it.

sworks · 12th August 2012, 19:07

Check that all the vac pipes are still attatched to the turbo

fizzgig656 · 12th August 2012, 19:14

Quote:

Originally Posted by sworks

Check that all the vac pipes are still attatched to the turbo

Yes, I also replaced them last time. Well the 3 that go from the top near the air filter(isn't that the boost controller?)?

sworks · 12th August 2012, 19:17

boost controller is located on the side of the airbox

fizzgig656 · 12th August 2012, 19:24

Quote:

Originally Posted by sworks

boost controller is located on the side of the airbox

I got it right, yes I replaced the two down to the turbo and one short one to the airbox out. Ensured I got the the right way round too. Didn't just pull the all of at once... Boost and runs fine if or when it does it. Sometimes I can release the throttle before it happens as I feel a nice but over powerful 2nd gear. It's not a constant either. Gut feeling says something sticking or not opening.

VVC-Geeza · 12th August 2012, 19:29

Did you replace the plugs/coils?

If so those symptoms are typical of a faulty boost control valve.

fizzgig656 · 12th August 2012, 19:30

See I don't think it helps that the car is an 05 and when I got her last year shed only done 29k. Think it had been driven by a "mrs daisy" so never problably opened the wasegate, hell probably never used the turbo?

fizzgig656 · 12th August 2012, 19:34

Well I'm skeptical of garages. Bit but they did change them for me under warrenty and after my request. Helped at bit at the time, would coil packs be on way out again. So new controller then? They easy to get?

fizzgig656 · 13th August 2012, 09:44

Quote:

Originally Posted by fizzgig656

Well I'm skeptical of garages. Bit but they did change them for me under warrenty and after my request. Helped at bit at the time, would coil packs be on way out again. So new controller then? They easy to get?

Or should I consider a manual boost controller?

VVC-Geeza · 13th August 2012, 15:37

Sounds like you can't be sure the garage changed the coils.

If it was me I would buy and change the complete ignition set
http://www.ebay.co.uk/itm/2307776836...84.m1423.l2649

If that doesn't solve the problem then I would change the boost control valve.I bought one recently as a spare,they are the genuine Rover OEM item but at half list price

http://www.ebay.co.uk/itm/ws/eBayISA...m=260949412835

Those items should cover all possible causes of your fault.

12th August 2012, 19:06	#1
fizzgig656 Regular poster rover tourer 1.8t Join Date: Jul 2012 Location: ipswich Posts: 86 Thanks: 7 Thanked 2 Times in 2 Posts	higher than normal boost before judder Hi all, I though I sorted a problem a few months ago but have had it happen again today. Normally when cold and in 2nd gear ill pull out of the end of my road and put my foot down. I have the turbo kick in and where I normally feel the peak of boost I feel a little more (asssuming a boost higher than normal) before I get a miss fire, then drive fine. I believe this to be an ecu instigated miss fire as its sensed an overboost. Both are present in the logs. Any ideas guys. Is it going to be a stickly wastegate? Faulty boost controller? I'm guessing the higher boost or jolt or rise in temp sorts it. __________________ Rover 75 1.8t tourer facelift Connoisseur parking sensors, K&N, towbar, cat back stainless down turned exhaust. love old cars, mg's,triumphs etc If any one has in interest in model engineering on a amateur/basic scale have a look at my progress of a gt6? Mostly hand made parts... http://www.tssc.org.uk/index.php?option=com_fireboard&Itemid=55&func=view &id=64300&catid=195&limit=10&limitstart=0

12th August 2012, 19:07	#2
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,065 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	Check that all the vac pipes are still attatched to the turbo __________________ ................................................. 'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle

12th August 2012, 19:17	#4
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,065 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	boost controller is located on the side of the airbox __________________ ................................................. 'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle

12th August 2012, 19:29	#6
VVC-Geeza This is my second home 2005 Connoisseur SE 1.8 Turbo,2004 45 1.8 Connoisseur and my beloved 1998 VVC Coupe. Join Date: Nov 2009 Location: Derby. Posts: 8,762 Thanks: 2,022 Thanked 1,016 Times in 739 Posts	Did you replace the plugs/coils? If so those symptoms are typical of a faulty boost control valve. __________________

12th August 2012, 19:30	#7
fizzgig656 Regular poster rover tourer 1.8t Join Date: Jul 2012 Location: ipswich Posts: 86 Thanks: 7 Thanked 2 Times in 2 Posts	See I don't think it helps that the car is an 05 and when I got her last year shed only done 29k. Think it had been driven by a "mrs daisy" so never problably opened the wasegate, hell probably never used the turbo? __________________ Rover 75 1.8t tourer facelift Connoisseur parking sensors, K&N, towbar, cat back stainless down turned exhaust. love old cars, mg's,triumphs etc If any one has in interest in model engineering on a amateur/basic scale have a look at my progress of a gt6? Mostly hand made parts... http://www.tssc.org.uk/index.php?option=com_fireboard&Itemid=55&func=view &id=64300&catid=195&limit=10&limitstart=0

12th August 2012, 19:34	#8
fizzgig656 Regular poster rover tourer 1.8t Join Date: Jul 2012 Location: ipswich Posts: 86 Thanks: 7 Thanked 2 Times in 2 Posts	Well I'm skeptical of garages. Bit but they did change them for me under warrenty and after my request. Helped at bit at the time, would coil packs be on way out again. So new controller then? They easy to get? __________________ Rover 75 1.8t tourer facelift Connoisseur parking sensors, K&N, towbar, cat back stainless down turned exhaust. love old cars, mg's,triumphs etc If any one has in interest in model engineering on a amateur/basic scale have a look at my progress of a gt6? Mostly hand made parts... http://www.tssc.org.uk/index.php?option=com_fireboard&Itemid=55&func=view &id=64300&catid=195&limit=10&limitstart=0

13th August 2012, 15:37	#10
VVC-Geeza This is my second home 2005 Connoisseur SE 1.8 Turbo,2004 45 1.8 Connoisseur and my beloved 1998 VVC Coupe. Join Date: Nov 2009 Location: Derby. Posts: 8,762 Thanks: 2,022 Thanked 1,016 Times in 739 Posts	Sounds like you can't be sure the garage changed the coils. If it was me I would buy and change the complete ignition set http://www.ebay.co.uk/itm/2307776836...84.m1423.l2649 If that doesn't solve the problem then I would change the boost control valve.I bought one recently as a spare,they are the genuine Rover OEM item but at half list price http://www.ebay.co.uk/itm/ws/eBayISA...m=260949412835 Those items should cover all possible causes of your fault. __________________