fusion158
Member Since: 08 Apr 2014
Location: California
Posts: 61
  
|
| Engine not running smoothly, multiple misfires. |
|
I have a 2005 LR3/Disco 3 with 135,000 miles. A few days ago I noticed it was running strangely after I started it, the car was shaking and it didn't sound right. After a few minutes it flashed a warning saying "Reduced Engine Performance" or something close to that. I pulled in and switched off the engine. I let it sit for about 10 minutes and then started again and it seemed to be running smoothly and I continued to my destination.
After a few hours I started the car to head back home and it was running rough again. After a minute the check engine light came on and the reduced performance warning came on again. It also was telling me that my Tailgate was open but when I checked it was closed tight. I managed to nurse the car home.
When I got home I got my basic engine scanner and I had the following 8 codes:
P0300 - Random/Multiple Cylinder Misfire Detected
P0304 - Cylinder #4 Misfire Detected
P0305 - Cylinder #5 Misfire Detected
P0316 - Engine Misfire Detected on Startup (First 1000 Revolutions)
P0300pd
P0304pd
P0305pd
P0316pd
I am currently out of town but will be home tomorrow and I want to have as much info as I can get before I start diagnosing the problem. I already have spark plugs so I will change them to eliminate the simple things.
I read that it could be a capacitor or coil packs. Is there anything else I should check?
|
 22nd Nov 2016 8:06 pm |
|
|
SafariDave
Member Since: 19 Nov 2011
Location: NYC & LA
Posts: 775
|
is it a V8 or a V6?
Did you replace your spark plugs at 90,000 miles or at 10 years?
Dave D3 2005 V8 SE Bonatti Grey "The Rhino" (our NYC D3)
De-tangoed Headlights, D4 2016 Style Black Pack Grille, D4 19" Wheels/ Bridgestone Alenza
D3 2005 V8 SE Bonatti Grey, D4 2016 Style Black Pack Grille (our LA D3)
D2 1999 V8 SD7 Chawton White (our Caribbean Beach truck)
|
| 22nd Nov 2016 8:22 pm |
|
|
geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3169
|
could be a coil pack swap cylinder 4 and 5 with others and see if the miss fire follows where they go  Discovery 3 se gone
Range rover sport supercharged here:)
|
| 22nd Nov 2016 8:39 pm |
|
|
fusion158
Member Since: 08 Apr 2014
Location: California
Posts: 61
|
Oh sorry, I have the V8. I was told the spark plugs were changed when I bought the car with 81,000 miles but you never know if that was true or not, that's why I will replace them regardless.
Thanks for the idea geoffsnook. I'll do that as well and report back tomorrow.
|
| 23rd Nov 2016 12:35 am |
|
|
fusion158
Member Since: 08 Apr 2014
Location: California
Posts: 61
|
So I just finished changing all the spark plugs. The ones I removed all looked pretty good, no unusual burn marks etc. I also swapped the cylinder number 2 coil pack with cylinder number 4 and swapped the cylinder number 5 coil pack with the cylinder number 3 coil pack.
I started the car and went for a very short test drive. It was still running rough and after I started to accelerate on the road the check engine light came on. I came home, ran the scanner and got the following codes:
P0300 - Random/Multiple Cylinder Misfire Detected
P0303 - Cylinder #3 Misfire Detected
P0307 - Cylinder #7 Misfire Detected
P0316 - Engine Misfire Detected on Startup (First 1000 Revolutions)
So the misfire followed the coil pack from cylinder 5 to cylinder 3 but a new misfire happened on cylinder 7 and no misfire from the coil pack the was moved from cylinder 4 to cylinder 2.
Any further suggestions other than to start replacing coil packs?
|
| 24th Nov 2016 6:42 pm |
|
|
fusion158
Member Since: 08 Apr 2014
Location: California
Posts: 61
|
Anyone?
|
| 25th Nov 2016 3:58 pm |
|
|
Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26701
|
Do you know a friend who has another V8 Disco, who would let you swap bits to try before buying them?
Not many V8 experts here I'm afraid.
|
| 25th Nov 2016 4:34 pm |
|
|
fusion158
Member Since: 08 Apr 2014
Location: California
Posts: 61
|
Unfortunately the only other person I knew with one sold it earlier in the year. I found a breaker yard selling the coil packs for $25 each so I think I will buy 4 of them and see how it goes. Better than $110+ for a new one.
|
| 25th Nov 2016 4:39 pm |
|
|
chawki212
Member Since: 25 Aug 2012
Location: Dubai
Posts: 7
  
|
Hi fusion158, how did you solve your missfire problem.
I have codes p0300 p0304 p0305 and p0316. The car it running rough and the CEL is on.
|
| 19th Apr 2019 1:51 am |
|
|
SafariDave
Member Since: 19 Nov 2011
Location: NYC & LA
Posts: 775
|
Try cleaning throttle body just in case.
Dave D3 2005 V8 SE Bonatti Grey "The Rhino" (our NYC D3)
De-tangoed Headlights, D4 2016 Style Black Pack Grille, D4 19" Wheels/ Bridgestone Alenza
D3 2005 V8 SE Bonatti Grey, D4 2016 Style Black Pack Grille (our LA D3)
D2 1999 V8 SD7 Chawton White (our Caribbean Beach truck)
|
| 19th Apr 2019 5:17 am |
|
|
chawki212
Member Since: 25 Aug 2012
Location: Dubai
Posts: 7
|
Will do thank you, any other suggestion
|
| 19th Apr 2019 5:06 pm |
|
|
kajtzu
Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6570
 
|
This is just a stab in the dark but have you thought of the PCV valve? Swapping it doesn’t cost much but if it’s blocked it can lead to really funky and obscure faults.
|
| 19th Apr 2019 6:39 pm |
|
|
fusion158
Member Since: 08 Apr 2014
Location: California
Posts: 61
|
chawki212 wrote:Hi fusion158, how did you solve your missfire problem.
I have codes p0300 p0304 p0305 and p0316. The car it running rough and the CEL is on.
Yes I did. It turned out it was just 1 coil pack that was causing the issue. For some reason it would also cause another coil pack to not work correctly.
|
| 20th Apr 2019 7:03 am |
|
|
SafariDave
Member Since: 19 Nov 2011
Location: NYC & LA
Posts: 775
|
good to know. How many miles on your truck?
Dave D3 2005 V8 SE Bonatti Grey "The Rhino" (our NYC D3)
De-tangoed Headlights, D4 2016 Style Black Pack Grille, D4 19" Wheels/ Bridgestone Alenza
D3 2005 V8 SE Bonatti Grey, D4 2016 Style Black Pack Grille (our LA D3)
D2 1999 V8 SD7 Chawton White (our Caribbean Beach truck)
|
| 20th Apr 2019 3:06 pm |
|
|
chawki212
Member Since: 25 Aug 2012
Location: Dubai
Posts: 7
|
Thank you Fusion158,
I have solved it already, also turned out to be a spark plug coil.
I was away for few days and once I got back, I used my IIDtool there was misfire on 4 and 5.
I cleared the faults and let the engine run for few minutes, p0300 and p0305 came back. Also cleared and again p0305 came back.
I switched coil 5 with 7, cleared and then p0307 showed. So it was fairly easy.
The reason it shows 2 cylinders sometimes is because the of the firing order 1-2-7-3-4-5-6-8.
Hope this helps and thank you again.
Cheers
|
| 20th Apr 2019 3:20 pm |
|
|
