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8th September 2019, 09:44 | #1 |
I really should get out more.......
Rover 75 connoisseur se v6 auto Join Date: May 2014
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P300 misfire under load
Car is juddering at 2500 rpm - when accelerating - Reader shows p300 random cylinder misfire - i know this can be due to many reasons - first one being failed ignition coil/HT leads / spark plugs/gapping etc. Anyway whilst having a look at these things i had a look at the battery which i have always had low resting voltage readings 12.2-3 (under RAC warranty and they insist its OK) and both terminals are covered in quite extensive whitish/green deposits - never seen this before on any of my batteries. So could a defective battery produce misfires?
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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. |
8th September 2019, 09:50 | #2 |
I really should get out more.......
Rover 75 connoisseur se v6 auto Join Date: May 2014
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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. Last edited by Yorkshire GOC; 15th June 2023 at 16:06.. |
8th September 2019, 11:31 | #3 |
This is my second home
All Trophy Blue ,ZT260#50 , ZT CDTI Auto, ZR105+ and 1.8T Firefrost spoiling the Set . Join Date: Nov 2006
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Got that at the moment on our 1.8T ...
we got P303 which is P300 on Cyl 3. And also P313 misfire ref Low Fuel ?? Going to give the plug/ Coils a good looking at ? C
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The Three Bloo's Wifey's Zr105, MY CDTI & 260 #50 and Number One sons 1.8T in Firefrost When I were a lad Zero to 142 in 10.25 secs at the Pod on my Blown Norton. 210 Kart Champ in 70's |
8th September 2019, 12:22 | #4 |
I really should get out more.......
Rover 75 connoisseur se v6 auto Join Date: May 2014
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Had AA Man to look at battery - which i have never been happy with - tested again and all fine reading 12.4 - which i always thought was the minimum resting voltage? - but he also ran other tests and the battery is OK .
However he tested the battery with the engine on - and as he turned the ignition you could here the distinct crackle/snap of a spark - he immediately said my HT Leads are discharging to earth - and that's causing the misfire -so pleased i called them out albeit for a different reason - will get new leads and packs ASAP . One simple diagnostic to remember for the future.
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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. |
8th September 2019, 20:41 | #5 |
This is my second home
All Trophy Blue ,ZT260#50 , ZT CDTI Auto, ZR105+ and 1.8T Firefrost spoiling the Set . Join Date: Nov 2006
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Had peep today , found plug 3 a bit fouled up .and cyl 2 plug hole filled with oil
All plugs had massive gaps All cleaned and re gapped to 0.7 , resealed cam cover , all running on 4 now, will see how it gets on next week. C
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The Three Bloo's Wifey's Zr105, MY CDTI & 260 #50 and Number One sons 1.8T in Firefrost When I were a lad Zero to 142 in 10.25 secs at the Pod on my Blown Norton. 210 Kart Champ in 70's |
8th September 2019, 21:56 | #6 | |
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R75 Saloon. Join Date: Feb 2009
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Quote:
This, however, does not mean the battery is defective in action, just that there is an acid leak. Spark plug leads should be well away from any metallic parts of the engine. Even new leads if looked at in complete darkness can show faint arcs to earth. The spark will ALWAYS take the easiest route. If the leads are starting to age the spark will jump through the insulation. However if the lead is well away from any earthing point the spark will go to where it's supposed to go.-- |
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9th September 2019, 08:19 | #7 |
This is my second home
Roverless + 1.7D Sportage Join Date: Aug 2014
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There was a factory note about the plug lead contacts becoming corroded and sometimes coming off the plug. A new set of front leads transformed my 99 V6 and the old ones were coming apart where they fit to the plugs. No doubt the 4 cylinder versions would be of the same type/manufacturer?
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