Quite suddenly my latest project MG ZT-T is running very roughly.

Abott10 · 9th August 2016, 22:00

Yesterday I used this ZT-T quite a lot. I became aware of a progressive decline in performance. Acceleration was patchy and trying to use it produced long periods ( 3-5 seconds ) of misfiring which would clear and the car would accelerate quickly and smoothly with sudden very brief and sharp loss of power which I suspect was boost cut. Something of which I have not experienced with K-Series Petrol Turbos before.

It became so bad that I turned around and headed for home. The car still running roughly and even the "Check engine" light came on and off a few times. Also was prone to stall at slow speeds when coming to a stop. Obviously some things were not right.

I decided to connect my T-300 Programmer which produced seven fault Codes, five "Historic" and two "current". More of this later.

Right, removed the Ignition Coil Packs wanting to look at the condition of the Spark Plugs. As soon as I put the Plug Removal socket on the No.1 Cylinder Spark Plug I felt it was only finger tight. No need for a socket drive to remove. Also lots of hardened oil on the Spark Plug and at the bottom of its location. No.2 Plug was very tight ~ not from over tightening but from oil hardened holding all the threads needing extra effort with the Socket drive. It came out intact which was a relief. The Spark Plugs in cylinders 3 and 4 were also finger tight loose with oil at the bottom of their locations.

Carefully removing No. 4 Plug there was a drop of liquid large enough to quench any spark. Inlet Manifold Gasket past its sell by date. So, that's another renewal.

I cleaned the plugholes then fitted new Spark Plugs and refitted a couple of spare coil packs and turned the key. Immediate start. No hesitation or delay and engine smooth and soon settled to a reliable idle.

These were the "Historic" codes:~ 1232; 0234; 1300; 1316 and 0300.

The "Current" Codes :~ 1520 and 0302.

My hard copy list of Generic DTC Definitions runs from P0001 to P0999.

Code 0234 = "Engine Overboost Condition". I have a good Boost gauge so that's another area to check.

Off now to check those fault code DTCs higher than 999... more new tricks learning for this old dog. Never too old to learn.

DMGRS · 9th August 2016, 22:03

Overboost will be this item: https://www.dmgrs.co.uk/products/1-8...erburg-germany

Jules · 9th August 2016, 22:06

Looks like those plugs have not been changed for years !!!

TomRS · 10th August 2016, 11:52

P1232 - Fuel Pump Speed Primary Circuit Malfunction
P1300 - Boost Calibration Fault
P1316 - Injector Circuit / IDM Codes Detected
P1520 - Intake Manifold Runner Control Circuit Malfunction
P0300 - Random/Multiple Cylinder Misfire Detected
P0302 - Cylinder 2 Misfire Detected

Thats What i found from a generic list, not so sure about the Manifold runner control mind...

Yorkshire GOC · 10th August 2016, 13:02

I had something similar on my turbo tourer - turned out to be a failed rocker gasket - certainly was plenty of oil around the plugs and when the gasket was replaced she has run fine ever since.

TomRS · 11th August 2016, 07:22

Upon buying a used car i will service the car myself literally within the first few days.
usually the same day of purchase.

I like to get to know what i have, i'll do filters/plugs/box oil/ PS fluid etc, all those things that are overlooked i'll change.

Makes me feel comfortable about then going off and abusing it.

I wont rev a car up and drive it quick until i've put my own oil/filters in at least, you dont know whats in there you cant trust what folk say anymore!

bl52krz · 13th August 2016, 19:19

I have had two rear shock absorbers since May, Monroe, and decided to start fitting them today. Managed to get one done, will do the other one on Monday.Got two front discs Delphi, and pads to fit also, so looks like a busy week ahead.

9th August 2016, 22:00	#1
Abott10 * Join Date: Apr 2014 Posts: 227 Thanks: 1,275 Thanked 1,917 Times in 1,328 Posts	Quite suddenly my latest project MG ZT-T is running very roughly. Yesterday I used this ZT-T quite a lot. I became aware of a progressive decline in performance. Acceleration was patchy and trying to use it produced long periods ( 3-5 seconds ) of misfiring which would clear and the car would accelerate quickly and smoothly with sudden very brief and sharp loss of power which I suspect was boost cut. Something of which I have not experienced with K-Series Petrol Turbos before. It became so bad that I turned around and headed for home. The car still running roughly and even the "Check engine" light came on and off a few times. Also was prone to stall at slow speeds when coming to a stop. Obviously some things were not right. I decided to connect my T-300 Programmer which produced seven fault Codes, five "Historic" and two "current". More of this later. Right, removed the Ignition Coil Packs wanting to look at the condition of the Spark Plugs. As soon as I put the Plug Removal socket on the No.1 Cylinder Spark Plug I felt it was only finger tight. No need for a socket drive to remove. Also lots of hardened oil on the Spark Plug and at the bottom of its location. No.2 Plug was very tight ~ not from over tightening but from oil hardened holding all the threads needing extra effort with the Socket drive. It came out intact which was a relief. The Spark Plugs in cylinders 3 and 4 were also finger tight loose with oil at the bottom of their locations. Carefully removing No. 4 Plug there was a drop of liquid large enough to quench any spark. Inlet Manifold Gasket past its sell by date. So, that's another renewal. I cleaned the plugholes then fitted new Spark Plugs and refitted a couple of spare coil packs and turned the key. Immediate start. No hesitation or delay and engine smooth and soon settled to a reliable idle. These were the "Historic" codes:~ 1232; 0234; 1300; 1316 and 0300. The "Current" Codes :~ 1520 and 0302. My hard copy list of Generic DTC Definitions runs from P0001 to P0999. Code 0234 = "Engine Overboost Condition". I have a good Boost gauge so that's another area to check. Off now to check those fault code DTCs higher than 999... more new tricks learning for this old dog. Never too old to learn.

9th August 2016, 22:03	#2
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	Overboost will be this item: https://www.dmgrs.co.uk/products/1-8...erburg-germany __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

9th August 2016, 22:06	#3
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	Looks like those plugs have not been changed for years !!! __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

10th August 2016, 11:52	#4
TomRS Posted a thing or two Mk1 ZT 190 - Mk2 ZS 180 - Mercedes E63 AMG S - Ford Ranger Hawk Join Date: Mar 2016 Location: Middlesbrough Posts: 1,456 Thanks: 123 Thanked 409 Times in 281 Posts	P1232 - Fuel Pump Speed Primary Circuit Malfunction P1300 - Boost Calibration Fault P1316 - Injector Circuit / IDM Codes Detected P1520 - Intake Manifold Runner Control Circuit Malfunction P0300 - Random/Multiple Cylinder Misfire Detected P0302 - Cylinder 2 Misfire Detected Thats What i found from a generic list, not so sure about the Manifold runner control mind... __________________ http://i66.tinypic.com/5cd6xj.jpg

10th August 2016, 13:02	#5
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,064 Thanks: 1,842 Thanked 623 Times in 469 Posts	Mis fire I had something similar on my turbo tourer - turned out to be a failed rocker gasket - certainly was plenty of oil around the plugs and when the gasket was replaced she has run fine ever since. __________________ 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.

11th August 2016, 07:22	#6
TomRS Posted a thing or two Mk1 ZT 190 - Mk2 ZS 180 - Mercedes E63 AMG S - Ford Ranger Hawk Join Date: Mar 2016 Location: Middlesbrough Posts: 1,456 Thanks: 123 Thanked 409 Times in 281 Posts	Upon buying a used car i will service the car myself literally within the first few days. usually the same day of purchase. I like to get to know what i have, i'll do filters/plugs/box oil/ PS fluid etc, all those things that are overlooked i'll change. Makes me feel comfortable about then going off and abusing it. I wont rev a car up and drive it quick until i've put my own oil/filters in at least, you dont know whats in there you cant trust what folk say anymore! __________________ http://i66.tinypic.com/5cd6xj.jpg

13th August 2016, 19:19	#7
bl52krz This is my second home Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008 Location: Birmingham Posts: 11,392 Thanks: 6,587 Thanked 2,262 Times in 1,729 Posts	I have had two rear shock absorbers since May, Monroe, and decided to start fitting them today. Managed to get one done, will do the other one on Monday.Got two front discs Delphi, and pads to fit also, so looks like a busy week ahead. __________________ Great Barr, Birmingham.