Huw

Tim (Remove NOSPAM. wrote:
> "Huw" <hedydd[nospam]@tiscali.co.uk> wrote in message
> news:2slp91F1n081oU1@uni-berlin.de...
>> Tim (Remove NOSPAM. wrote:
>>> "AstraVanMan" <Off@WithThanks.com> wrote in message
>>> news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
>>>> It doesn't do it massive amounts (not that I can see in the
mirror
>>>> from the driver's seat) but a mate of mine has said that it
smokes
>>>> quite a bit, and that it can be thick and black (yup, it's a
>>>> diesel!).
>>>>
>>>> Obviously it's the sort of thing you notice more at night than in
>>>> daylight, but this morning when leaving for work (engine had only
>>>> been running a couple of minutes up to this point btw) pulling
away
>>>> not particularly quickly resulted in not particularly thick (but
>>>> still noticeable) smoke in the car behind's headlights.
Obviously
>>>> darkness and headlights do tend to emphasise any smoke coming out
>>>> of any car's exhaust though.
>>>>
>>>> My question is this - does my engine (5-cylinder 140bhp 2.5TDI)
>>>> have a MAF sensor, and is this easy enough to take out and clean
>>>> (should this be neccessary), and if that's all ok, how much
should
>>>> I expect to have to pay to get the injectors ultrasonically
>>>> cleaned.
>>>>
>>>
>>> If you have power loss and no smoke then in typical VAG fashion
the
>>> MAF is buggered. If not then the MAF is fine- you wont get excess
>>> smoke from a faulty MAF.
>>>
>>> At 125k or so the injectors are well past it-
>>
>> They really shouldn't be, although they could be. I've never had a
>> general wear or maintainance problem with them at this mileage on a
>> modern engine although the very occasional one does actually fail
in
>> some way.
>>
>>
>>
>> have them overhauled if
>>> it is getting abit smokey- likewise clean out the EGR system, and
if
>>> possible blank it off- this is a major cause of excess smoke.
>>
>> Yes, all those vacuum operated valves which restrict air flow etc
and
>> which rely on small capillary tubes are a potential nightmare. I've
>> long rendered my Isuzu's system inoperable due to problems. My
Toyota
>> OTOH has been no bother in this area, neither have the Nissans.
Yet.
>>
>> Huw
>
>
> Injectors are past their best at 80k. At 125k they'd be shot. You
dont
> notice the fall off in smoothness, and performance until you fit a
> new / recon-ed set.
>
> Tim..

Not my experience I'm afraid. All I can go on is my experience, but it
does cover a huge number of engines. Within reason, the more an
injector is used, the smoother the combustion, though ultimately the
injectors do wear of course. I have changed several sets of injectors
[before I started to use ATF] with either no result, or twice when the
proffessionaly reconditioned injectors were worse than the original
ones with over 100k on them.
Similarly with injector pumps. Between my own fleet and indirectly
maintaining a large park of other vehicles, I find quite a few
[mainly] rotary injector pumps that need maintainance/repair every
year. The other day one of a fleet of Nissan vans came in as a result
of the driver opening the fuelling out and upsetting something
internally. Sent it away to one of the most reputable frachise
specialists in the Country and it came back exactly the same, with
shovel loads of soot coming out of the exhaust. Second time lucky
though.

To put some figures on injector wear, I have found that the average
use before an injector actually needs some work done to it is about
every 450,000,000 cycles. This equates to about 150,000 miles on
average I would have thought.
I have one Mitsubishi Shogun with the old 2.5 indirect injection
engine presently that has led a very hard life, with much heavy towing
and its share of two minute runs, and which has never had its fuel
system touched apart from filter changes. 145,000 and it smokes and
runs no worse than new. Unless an injector suffers a catastrophic
failure, I can see no reason to change or touch the injectors any time
soon.

My moto has always been, "if it ain't broke, don't fix it, but if it
is broke, get the job done quick"

By the way, My BMW 3.0 diesel needed a single new injector at around
15,000 miles.

Huw


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/04

Bikeman

Sorry for the "off" question, but everyone can tell me, that how many
torque has this engine? And in which rpm. range achieve the max?

Thx a lot, Bikeman

Bikeman

Sorry for the "off" question, but everyone can tell me, that how many
torque has this engine? And in which rpm. range achieve the max?

Thx a lot, Bikeman

Bikeman

Sorry for the "off" question, but everyone can tell me, that how many
torque has this engine? And in which rpm. range achieve the max?

Thx a lot, Bikeman

Bikeman

Sorry for the "off" question, but everyone can tell me, that how many
torque has this engine? And in which rpm. range achieve the max?

Thx a lot, Bikeman