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[quote=”spelunkerd” post=41285]I’m still waiting to learn about how to do a professional fuel injection service. One mechanic told me that the job should be done with each injector individually, not as a group while on the car. I guess I was under the presumption that a bad injector would usually give a lean condition for a single cylinder. But, on thinking about it, if the computer detects a lean condition downstream then it would boost fuel to all, resulting in bad mileage and maybe misfires. Eric, where’s that video you did but never posted, on fuel injection cleaning?[/quote]
Would be very handy to see. I’ve got a spare fuel rail that I’ve pulled the injectors out of so if this is something that can be DIY’d I could practise on them first.
Having said that I don’t think it’s that expensive over here (UK) to get the injectors cleaned. Just really wonderig if this should be done as a service type thing.
Thanks for the replies folks; really sorry I haven’t replied earlier but for some reason the e-mails saying I’d had replies had been auto placed in to one of my folders. Weird!
Anyhow, yeah I have had an alignment done. I’ve never had my injectors serviced. If I did that would also driving it hard sort out the ”sponge” syndrome in the combustion chamber you mentioned?
I’ve got the correct pressures in my tyres and I plan to drive more spirited more often 😉
Regarding the fuel trim: got to be honest I’m only still in school so I don’t fully understand the results of the reading session. I may have to get it done again (as he kindly does it for free) and report the findings here.
Other than that I’m really believing it’s the short journeys and that there’s actually not a problem.
Oh and the car gets to temp in good time and doesn’t overheat or overcool.
Cheers.
Thanks for the replies folks; really sorry I haven’t replied earlier but for some reason the e-mails saying I’d had replies had been auto placed in to one of my folders. Weird!
Anyhow, yeah I have had an alignment done. I’ve never had my injectors serviced. If I did that would also driving it hard sort out the ”sponge” syndrome in the combustion chamber you mentioned?
I’ve got the correct pressures in my tyres and I plan to drive more spirited more often 😉
Regarding the fuel trim: got to be honest I’m only still in school so I don’t fully understand the results of the reading session. I may have to get it done again (as he kindly does it for free) and report the findings here.
Other than that I’m really believing it’s the short journeys and that there’s actually not a problem.
Oh and the car gets to temp in good time and doesn’t overheat or overcool.
Cheers.
Hi Dreamer, thanks for the reply.
Yes I’ve had the scanner put on it. All readings looked normal except my mate who did it mentioned that I have some lazy O2 readings. However, I thought that would simply mean a replacement set of O2 sensors. But he said that they were more than likely being lazy due to something else e.g. vacuum leak, bad MAF sensor etc.
I’ve today done a vacuum leak check (following that guide…thanks for that) and idle never changed.
Apart from cleaning the MAF I’m wondering where to go now.
It is worth mentioning that it is a big car that only really ever does short runs so I’m aware that it’ll pretty much always be running on the choke due to it taking time to get to temp. I’ve also tried to change my driving style.
With all this taken in to consideration it still seems pretty low.
I’m now wondering if perhaps there is nothing wrong as such and perhaps the above factors are solely causing the MPG drop.
Oh and the car has 96000 miles on it 🙂
Thanks for your help 🙂
Hi Dreamer, thanks for the reply.
Yes I’ve had the scanner put on it. All readings looked normal except my mate who did it mentioned that I have some lazy O2 readings. However, I thought that would simply mean a replacement set of O2 sensors. But he said that they were more than likely being lazy due to something else e.g. vacuum leak, bad MAF sensor etc.
I’ve today done a vacuum leak check (following that guide…thanks for that) and idle never changed.
Apart from cleaning the MAF I’m wondering where to go now.
It is worth mentioning that it is a big car that only really ever does short runs so I’m aware that it’ll pretty much always be running on the choke due to it taking time to get to temp. I’ve also tried to change my driving style.
With all this taken in to consideration it still seems pretty low.
I’m now wondering if perhaps there is nothing wrong as such and perhaps the above factors are solely causing the MPG drop.
Oh and the car has 96000 miles on it 🙂
Thanks for your help 🙂
[quote=”Jotmon1″ post=39839]How confident are you that the fuel is up to speck? If you are on to E85 or something similar, the economy per Liter will significantly decrease. Otherwise, if you are not having performance issues, start with the tires and work your way up.
Tire Pressure
Engine Temperature
Fuel Leak
Intake Manifold leak
Vaccum Leak – You can use low pressure water to check for intake leaks.[/quote]Thanks for your reply.
Fuel is standard unleaded, nothing special. And you’re correct i have no performance issues (sorry should have perhaps pointed that out)tyre pressures are correct as per manufacturers rec. for the usual load.
engine temp…. bang on the half way point on the gauge all the time.
no visible fuel leaks and no smell of petrol in the engine bay.
intake/vacuum leak… next on my check list.thanks for that.. i feel im going in the right direction 🙂
[quote=”Jotmon1″ post=39839]How confident are you that the fuel is up to speck? If you are on to E85 or something similar, the economy per Liter will significantly decrease. Otherwise, if you are not having performance issues, start with the tires and work your way up.
Tire Pressure
Engine Temperature
Fuel Leak
Intake Manifold leak
Vaccum Leak – You can use low pressure water to check for intake leaks.[/quote]Thanks for your reply.
Fuel is standard unleaded, nothing special. And you’re correct i have no performance issues (sorry should have perhaps pointed that out)tyre pressures are correct as per manufacturers rec. for the usual load.
engine temp…. bang on the half way point on the gauge all the time.
no visible fuel leaks and no smell of petrol in the engine bay.
intake/vacuum leak… next on my check list.thanks for that.. i feel im going in the right direction 🙂