Diesel misfire

scorpio · 26th February 2018, 13:22

I know that the title sounds silly but that's the only way I can describe it. Every so often the car blips and it feels like a misfire, the EML comes on for a split second then everything goes back to normal.

I have changed the pcv and serviced the engine, put a working maf sensor in, both pumps are running. I am running out of ideas can anyone give me a clue please.

tantallon · 26th February 2018, 13:24

Sticking injector .Loose electrical connection .Check all connections first

rustymotor · 26th February 2018, 13:35

Have you tried a disconnect battery reset it may help..

Arctic · 27th February 2018, 11:09

HI Peter.
What state is your EGR & manifold in also the MAP sensor, have they ever been cleaned, do you have a bypass EGR, check the vacuum pipes are not rubbing from the EGR solenoid, all the above worth looking at nano meet not far away pop over and get a free T4 session.

BigRuss · 27th February 2018, 12:22

Although both pumps are running I suspect the likely cause of your 'misfire' is that one of them is about to fail.

That is what I have found in the past, if the car has more than a quarter of a tank then it's likely to be the underbonnet pump

Russ

scorpio · 28th February 2018, 16:19

I have a EGR bypass and the manifiold and MAP sensor have been cleaned, there is about 3/4 tank of fuel it only seems to happen when it has been running for a while.

I have also noticed that the thermostat maybe stuck open as it is struggling to warm up.

scorpio · 8th March 2018, 11:21

Well its all fixed, it was the under bonnet pump that was failing. I changed that and put a new fuel filter on and no more misfire.

Now I have a new problem black smoke on acceleration.

DMGRS · 8th March 2018, 11:35

Black smoke could be the intercooler O rings leaking:
https://www.dmgrs.co.uk/collections/...er-o-rings-kit

Very common. Other common causes include a blocked inlet manifold / EGR valve, or an over-reading MAF sensor.

scorpio · 8th March 2018, 11:37

Hi Matt, I have already done them I got them from you last year,

Arctic · 8th March 2018, 22:10

[QUOTE]

Quote:

Originally Posted by scorpio

Hi Matt, I have already done them I got them from you last year,

[/QUOTE

]

Peter if you make one of the nano meets this year maybe we could double check them I have the bends already made up, also the three Viton ring mod ones

all FOC

26th February 2018, 13:22	#1
scorpio Loves to post 75 Tourer zircon silver Join Date: Dec 2015 Location: Birmingham Posts: 270 Thanks: 47 Thanked 32 Times in 27 Posts	Diesel misfire I know that the title sounds silly but that's the only way I can describe it. Every so often the car blips and it feels like a misfire, the EML comes on for a split second then everything goes back to normal. I have changed the pcv and serviced the engine, put a working maf sensor in, both pumps are running. I am running out of ideas can anyone give me a clue please. __________________ Peter Rover 75 Tourer Connoisseur CDT Auto Zircon Silver

27th February 2018, 11:09	#4
Arctic Give to Learn Freelander 2 Join Date: Aug 2010 Location: West Midlands Posts: 18,694 Thanks: 1,155 Thanked 6,407 Times in 3,874 Posts	HI Peter. What state is your EGR & manifold in also the MAP sensor, have they ever been cleaned, do you have a bypass EGR, check the vacuum pipes are not rubbing from the EGR solenoid, all the above worth looking at nano meet not far away pop over and get a free T4 session. __________________ Arctic Givology Learn to Give Everything is Achievable ad altiora tendo. Check out our Nano meet dates http://www.midlandsnanomeets.co.uk/ http://www.the75andztclub.co.uk/index.php?thepage=howto " You do the work , we supply the expertise "

27th February 2018, 12:22	#5
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,405 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	Although both pumps are running I suspect the likely cause of your 'misfire' is that one of them is about to fail. That is what I have found in the past, if the car has more than a quarter of a tank then it's likely to be the underbonnet pump Russ __________________ Replacement Key Service http://https://the75andztclub.co.uk/...d.php?t=244732 Full T4 Testbook diagnostics available. Diesel ECU repair and replacement. Options enabled or disabled as required. Diesel X-Power 135 and 160bhp, Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.

28th February 2018, 16:19	#6
scorpio Loves to post 75 Tourer zircon silver Join Date: Dec 2015 Location: Birmingham Posts: 270 Thanks: 47 Thanked 32 Times in 27 Posts	I have a EGR bypass and the manifiold and MAP sensor have been cleaned, there is about 3/4 tank of fuel it only seems to happen when it has been running for a while. I have also noticed that the thermostat maybe stuck open as it is struggling to warm up. __________________ Peter Rover 75 Tourer Connoisseur CDT Auto Zircon Silver

8th March 2018, 11:21	#7
scorpio Loves to post 75 Tourer zircon silver Join Date: Dec 2015 Location: Birmingham Posts: 270 Thanks: 47 Thanked 32 Times in 27 Posts	Well its all fixed, it was the under bonnet pump that was failing. I changed that and put a new fuel filter on and no more misfire. Now I have a new problem black smoke on acceleration. __________________ Peter Rover 75 Tourer Connoisseur CDT Auto Zircon Silver

26th February 2018, 13:24	#2
tantallon Gets stuck in ROVER 75 SALOON Join Date: Apr 2017 Location: Peterborough Posts: 597 Thanks: 386 Thanked 316 Times in 144 Posts	Sticking injector .Loose electrical connection .Check all connections first

26th February 2018, 13:35	#3
rustymotor Posted a thing or two Rover 75 Tourer Join Date: May 2017 Location: Hull Posts: 1,848 Thanks: 216 Thanked 432 Times in 340 Posts	Have you tried a disconnect battery reset it may help..

8th March 2018, 11:35	#8
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	Black smoke could be the intercooler O rings leaking: https://www.dmgrs.co.uk/collections/...er-o-rings-kit Very common. Other common causes include a blocked inlet manifold / EGR valve, or an over-reading MAF sensor. __________________ 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

8th March 2018, 11:37	#9
scorpio Loves to post 75 Tourer zircon silver Join Date: Dec 2015 Location: Birmingham Posts: 270 Thanks: 47 Thanked 32 Times in 27 Posts	Hi Matt, I have already done them I got them from you last year, __________________ Peter Rover 75 Tourer Connoisseur CDT Auto Zircon Silver

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