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Rough idle and engine warning light
- Wrighty
- Member
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- Joined: Tue Jan 05, 2016 10:47 am
- Location: Sheffield
Rough idle and engine warning light
I've got a rough idle which started a few days ago, originally when starting up in the morning it would have to automatically put on a few revs to keep running.
Then yesterday it was idling rough whenever I stopped even after a good length drive.
Today the orange engine light came on, still the same rough idle as yesterday.
Any idea guys? I don't have access any diagnostic equipment myself unfortunately
Then yesterday it was idling rough whenever I stopped even after a good length drive.
Today the orange engine light came on, still the same rough idle as yesterday.
Any idea guys? I don't have access any diagnostic equipment myself unfortunately
- Smartbear
- Lifer
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- Location: a barn in Somerset
Rough idle and engine warning light
Unless you get it scanned it’s all guessworkWrighty wrote: ↑Fri Jul 27, 2018 7:05 pm I've got a rough idle which started a few days ago, originally when starting up in the morning it would have to automatically put on a few revs to keep running.
Then yesterday it was idling rough whenever I stopped even after a good length drive.
Today the orange engine light came on, still the same rough idle as yesterday.
Any idea guys? I don't have access any diagnostic equipment myself unfortunately
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
- Wrighty
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- Location: Sheffield
Rough idle and engine warning light
Yeah unfortunately so Rob, hopefully it'll flag up exactly what it isSmartbear wrote: ↑Fri Jul 27, 2018 7:08 pmUnless you get it scanned it’s all guessworkWrighty wrote: ↑Fri Jul 27, 2018 7:05 pm I've got a rough idle which started a few days ago, originally when starting up in the morning it would have to automatically put on a few revs to keep running.
Then yesterday it was idling rough whenever I stopped even after a good length drive.
Today the orange engine light came on, still the same rough idle as yesterday.
Any idea guys? I don't have access any diagnostic equipment myself unfortunately
Rob
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- Lifer
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Rough idle and engine warning light
Breakdown cover may read codes for free. Investing in a scanner should pay for itself in one use though.
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.
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Rough idle and engine warning light
I agree you need to read the codes. But when I had a similar problem I fixed it by cleaning the vanos solenoids.
It's a no cost repair. Plenty of info on here especially a thread under my name.
It's a no cost repair. Plenty of info on here especially a thread under my name.
2007 3.0 Si
Montego Blue
Manual
Montego Blue
Manual
- ph001
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Rough idle and engine warning light
What model? If it's a 2.0l, Valvetronic motor or eccentric cam sensor a distinct possibility... viewtopic.php?f=3&t=102843&p=1532625&hi ... c#p1532625
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Rough idle and engine warning light
If the EML is on, there should be a code to read.
I bought a Bluetooth ODB2 reader from ebay for a few quid and the Torque app showed me the codes.
I bought a Bluetooth ODB2 reader from ebay for a few quid and the Torque app showed me the codes.
- Wrighty
- Member
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- Joined: Tue Jan 05, 2016 10:47 am
- Location: Sheffield
Rough idle and engine warning light
2004, 3.0
Codes read,
2882 bank 1 fuel trim
2883 bank 2 fuel trim
Leading towards a split air hose somewhere I reckon. Unable to see where yet though
Knocking noise disappears when the clutch is pressed (in neutral) Definetly coming from the flywheel-cluch area. These have DMF's right?
Edit: realise I didn't mention this second issue in the original post!
Codes read,
2882 bank 1 fuel trim
2883 bank 2 fuel trim
Leading towards a split air hose somewhere I reckon. Unable to see where yet though
Knocking noise disappears when the clutch is pressed (in neutral) Definetly coming from the flywheel-cluch area. These have DMF's right?
Edit: realise I didn't mention this second issue in the original post!
Last edited by Wrighty on Thu Aug 09, 2018 2:13 pm, edited 1 time in total.
- Wrighty
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- Location: Sheffield
Rough idle and engine warning light
Codes cleared, will see if they return after a drive this evening
- Wrighty
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- Posts: 212
- Joined: Tue Jan 05, 2016 10:47 am
- Location: Sheffield
Rough idle and engine warning light
Same light returned a few days later. Spotted a small split in rubber elbow inbetween the airbox and inlet manifold.
Changed this morning and light cleared again... rough idle still present...
Changed this morning and light cleared again... rough idle still present...
- Wrighty
- Member
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- Location: Sheffield
Rough idle and engine warning light
Convinced myself that it isn't a vacuum leak anywhere but definitely fuel/air mix related, my average mpg (over a good distance) has dropped by 3mpg since the issue started. Also oil usage noticeably decreased too although i'm not sure how related this is...
MAF sensor suspected knackered, after good run C110 was reading this:
10.5kg/h (clutch pedal down)
9.5kg/h (clutch pedal up)
I believe 13kg/h is what it should be, can anyone confirm?
Unplugged the MAF connector earlier and it stared up and it idled as badly as usual. I am unsure as to what this indicates, does the car automatically default to some stored setting when it detects the MAF sensor is unplugged? Or is mine broken hence why unplugging it makes no effect on how the car runs?
Will electrical contact cleaner be a suitable thing to clean it with?
Seems I have created more questions than answered ones today!
Wrighty
MAF sensor suspected knackered, after good run C110 was reading this:
10.5kg/h (clutch pedal down)
9.5kg/h (clutch pedal up)
I believe 13kg/h is what it should be, can anyone confirm?
Unplugged the MAF connector earlier and it stared up and it idled as badly as usual. I am unsure as to what this indicates, does the car automatically default to some stored setting when it detects the MAF sensor is unplugged? Or is mine broken hence why unplugging it makes no effect on how the car runs?
Will electrical contact cleaner be a suitable thing to clean it with?
Seems I have created more questions than answered ones today!
Wrighty
- srhutch
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Rough idle and engine warning light
Thislaurieballard wrote: ↑Thu Aug 02, 2018 12:13 pm If the EML is on, there should be a code to read.
I bought a Bluetooth ODB2 reader from ebay for a few quid and the Torque app showed me the codes.
An ELM327 adapter and torque app for under a tenner, you can read and reset EML easily.
- Wrighty
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- Location: Sheffield
Rough idle and engine warning light
Further codes other than the ones mentioned in my earlier post @srhutch? I was expecting slightly more info from the C110 when reading the codes through that.srhutch wrote: ↑Tue Aug 28, 2018 8:30 pmThislaurieballard wrote: ↑Thu Aug 02, 2018 12:13 pm If the EML is on, there should be a code to read.
I bought a Bluetooth ODB2 reader from ebay for a few quid and the Torque app showed me the codes.
An ELM327 adapter and torque app for under a tenner, you can read and reset EML easily.
Wrighty
- ph001
- Lifer
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Rough idle and engine warning light
The fuel trim codes basically mean it can't compensate the injection any further to account for an incorrect mixture. Could be:
MAF
Air leak
EGR valve
O2 sensors (usually bring up their own codes though)
...be nice if you could swap the MAF for a known good one to eliminate but MAF problems are pretty rare on the 3.0l. EGR valves certainly get gunked up pretty often though and the pipe can degrade which leads down to the sump.
The knocking noise which disappears when you press the clutch is a very common DMF noise and nothing too much to worry about.
MAF
Air leak
EGR valve
O2 sensors (usually bring up their own codes though)
...be nice if you could swap the MAF for a known good one to eliminate but MAF problems are pretty rare on the 3.0l. EGR valves certainly get gunked up pretty often though and the pipe can degrade which leads down to the sump.
The knocking noise which disappears when you press the clutch is a very common DMF noise and nothing too much to worry about.
- Wrighty
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- Location: Sheffield
Rough idle and engine warning light
Thanks ph001,ph001 wrote: ↑Wed Aug 29, 2018 10:34 am The fuel trim codes basically mean it can't compensate the injection any further to account for an incorrect mixture. Could be:
MAF
Air leak
EGR valve
O2 sensors (usually bring up their own codes though)
...be nice if you could swap the MAF for a known good one to eliminate but MAF problems are pretty rare on the 3.0l. EGR valves certainly get gunked up pretty often though and the pipe can degrade which leads down to the sump.
The knocking noise which disappears when you press the clutch is a very common DMF noise and nothing too much to worry about.
Yes hopefully cleaning the MAF will clear it.
Unfortunately I do not know of anyone local to swap it with. I will definitely look into the EGR valve, not something I'd considered.
Yeah the DMF noise is something that it's always had, it has just been exaggerated recently with this rough idle. Starting and turning off the car with the clutch depressed helps massively
Cheers