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3rd August 2011, 12:52 | #1 |
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Mil Codes P0172 & P0300 Plus misfire
Hi if you have been reading i have had a few problems with my MG ZT 2.5 160.
I have codes P0172 & P0300 and have a misfire on Cyl 1,3,5 between 1500 & 2000 rpm and clears after 2000rpm.cyl 3 & 5 are worse than cyl 1. I have put another inlet manifold on recently and also 2 recondition vis valves. This is what i have done so far. Changed Plugs & leads. Swapped coil packs between Cylinder 1 & 5 but no change. Checked that there is a good earth inc from the coil packs. Any help and info would be great as dont know what else to do. Many thanks Rob |
3rd August 2011, 14:00 | #2 |
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See Post 2 Entry 62, Parts 1,2,3, etc. for a generic codes listing.
Click: http://www.the75andztclub.co.uk/foru...ult+codes+list These will not include the bespoke MGR codes which requires a T4 or similar to interpret properly. Yours are: P0172 System Too Rich (Bank 1) P0300 Random Misfire Detected Which may or may not help. TC |
3rd August 2011, 14:37 | #3 | |
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Hi T-Cut i know what the code mean's i am looking for anyone with any info to what a cure could be. like i said i got a misfire on Cyl 1,3,5 so this is to do with the P0300 code but i can't seem to find why it is doing it. Also been told i am getting the 2 fault codes as they could be link so looking for some advice where to go from here as i have change, swapped the things i could do. Cheers, Rob |
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3rd August 2011, 19:58 | #4 |
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Hi, well P0300 Random Misfire Detected can some times be down to worn plugs but you changed these it cant be this, have you checked the wires to all 3 coils maybe damaged?
P0172 System Too Rich (Bank 1) Maybe a air leak on the inlet manifold? If not any of above may be fuel injectors?
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3rd August 2011, 21:42 | #5 |
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If you got a multable missfire code whiuch you do have then it will flag it as running rich as it is putting unburnt petrol down the exhaust. So you missfire is on bank one looking at it
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4th August 2011, 06:52 | #6 | |
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misfire
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Does the car mis-fire all the time? I know you say ok above 2000..... |
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4th August 2011, 07:58 | #7 |
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Rob, have a word with Jake ( reg sec ) his blue zt is/was suffering the same missfire on the front bank, not sure if he has cured it yet, we were looking at changing coil packs and leads to the front bank.
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4th August 2011, 09:02 | #8 | |||
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Cheers for all your input. Rob |
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4th August 2011, 09:05 | #9 | |
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Quote:
Also if there was a leak on the inlet manifold would this cause a misfire on bank 1?? Cheers Rob |
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4th August 2011, 16:28 | #10 |
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Also if there was a leak on the inlet manifold would this cause a misfire on bank 1??
No! it would just over fuel! I been thinking about your misfire, sometimes other things like water/oil can get into the pistons and cause a misfire but they will not be picked up by the ecu and be in form of a fault code! Also lack of fuel will cause a misfire, i had this on my ZT with a lpg faultly injector which i got a fault code which states 'misfire due to lack of fuel' So you can not have any of the above! So as yours is getting codes its got to be on the electric side, so check the wiring/earths going to the 3 coils. Is there anyone near you who you could swap coils with just to try?, but its got to be around the same age V6 because around 2003 onwards the coil are different and dont have spark plug leads.
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