Bad injector symptoms??

[diesel_smoke]

I like to know what symptoms will show with my 01' tdi when an injector is bad or going bad? I'd rather not get into my cars issues but again list symptoms of a faulty injector.

Thanks

 

[Diesel Addict]

Knocking, smoking, surging idle. They don't all have to show up at once, but any of these symptoms could be caused by a bad injector. I recommend the use of a cleaning fuel additive on a regular basis to help prevent this situation.

 

[SharanTDI]

How often is it normal to replace injectors?

 

[oilhammer]

More times than not on a TDI bad injectors just means underfueling, which means low power.

 

[LanduytG]

Short of pulling the injectors and testing them, you can tell more from a cold start by looking at the exhaust than you can any other way. I've seen bad nozzles with less than a 100K and I've seen very good ones with over 150K on them. Their is no set magic number when it comes to this. Fuel quality has more to do with injector life than anything else. Using a fuel additive will help as well. If you use a good filter and change them regular and use fuel additive on a regular bases then a clearer is rarely needed.

Greg

 

[Diesel Addict]

How often is it normal to replace injectors?

It really depends on the quality of fuel. Theoretically, if one uses a good fuel additive that has lubricating, cleaning and water-dispersing properties, the injectors can last indefinitely.

More times than not on a TDI bad injectors just means underfueling, which means low power.

Bad injectors will also increase emissions and engine wear.

 

[oilhammer]

Yes, that is true. I was just trying to describe a "seat of your pants" symtom.

When I say low power output, I mean the car is dangerous to drive. Like a bad MAF times 3.

Greg, I actually have another set here I need checked out.

 

[Fortuna Wolf]

At 85,000 miles I had symptoms of knocking, smoking, and once or twice a surging idle. Replaced them with some larger used nozzles that were ultrasonically cleaned. Much nicer, and less smoke.

 

[perrya]

How does an injector lose the ability to maintain fuel pressure causing a misfire. When this happens, can it be fixed or cleaned or is it just time for a new one? What should the specs be for a good injector on VAG?

 

[golffriend]

Hello, I am new to the forum and sorry for bad english...
Had big problem with 2 cylinder - misfire error, 2 injector bad values in group 023 (+20/-30/+12/+18) - 2 cyl. overfueling or too early injection. Engine stalls on idle or while driving. Golf mk4 TDI PD 85kW 2000 variant 6 gear manual. Engine AJM (as remember).
All cleared after EGR restoring (connected) and driving some time with MAF disconnected. Then MAF connected and cold restart cured all!
The problem was intermittent, temperature depending (40-70 C) a few times in month. Allso very hard start after stalling, 1 minute cranking reguired. No air in fuel. Cold start after night with misfiring (no air!). ECU algorythm problem because of EGR being disconnected. Problem arrised only after one month as EGR disconnected.

 

[Dimitri16V]

It was not the MAF
The ECU measures the cylinders response ( combustion ) by measuring the rotational speed of the crankshaft . If a cylinder misfires , the ECU will overfuel that cylinder .That can exceed the injector parameters resulting in an error code

While a bad injector will give the same errors , the compression on the suspect cylinder should be checked first before blaming the injector

 

[golffriend]

In my case that were blow-by gases in fuel return from injectors and seals... I drilled 1 mm hole in thermostatic "T" on fuel filter and no more problems with injectors.

 

[sisyphus]

Ah... What?

 

[BobnOH]

How often is it normal to replace injectors?

My local guru, Jon Hamlton up in Marysville (Rally TDI?) says 80k.
From reading these forums I'm gonna say that's a pretty low number.
Again, just from my reading, I'd say 150k to 200k.
I'm curious as well to know what indicators there are.

 

[csstevej]

Well I went to 350k on stock nozzles.
Started to get some smoke on start up and poor fuel economy.
Switched them out to sprint 520's.
Happier now.

 

[BobnOH]

Well I went to 350k on stock nozzles.
Started to get some smoke on start up and poor fuel economy.
Switched them out to sprint 520's.
Happier now.

That's what we're looking for, thanks Steve.

 

[PunchKangaroo]

I guess you can prolong their life with occasionally using strong dosage of ATF oil mixed with fuel (mechanical nozzles).

My group 13 figures went from
0.46; 0.42; -0.52; 0.59
to
0.05; 0.00; -0.16; 0.09 and oh boy how smooth the idle is now.

Never had this good cold start (-21 degrees) either before.

 

[perrya]

The injector have a mechanical and Electrical component. The electronic side controls to the solenoid and may be OK, thus no code is given until it fails. The mechanical may fail to work well. In this manner, there are no engine codes, but the car is hard to start after sitting overnight and may require 3-4 tries to start until pressure builds up.

 

[muzy]

The injector have a mechanical and Electrical component. The electronic side controls to the solenoid and may be OK, thus no code is given until it fails. The mechanical may fail to work well. In this manner, there are no engine codes, but the car is hard to start after sitting overnight and may require 3-4 tries to start until pressure builds up.

I am unaware of this electrical component in this age of tdi. Tell me more.
Cheers

 

[AnotherPerson]

Maybe he's talking about the injector with the sensor?


Sent from my iPhone using Tapatalk

 

[whitedog]

He is talking about PD and common rail injectors.

 

[turbovan+tdi]

Yep, 04-08 have electrical components. I had an intermittant miss, and my power was down, started perfectly though, 385K on them, changed them out to low mile PD150's, she's a whole new car.

 

[perrya]

From my understanding, the electronic part controls the solenoid. One of my injectors leaked pressure over a long period time of sitting, there were no codes but the mechanical aspect was failing to maintain pressure when starting. After a three tries, it would start and run fine all day. Even parking it for hours, it would start instantly. The problem was usually after sitting overnight that starting was the issue. Anyone have a similar issue? Now, I am having the issue again, no codes, but starts after three tries. I figure the older injectors are now failing (it has 224K). Could it be anything else?

 

[turbovan+tdi]

From my understanding, the electronic part controls the solenoid. One of my injectors leaked pressure over a long period time of sitting, there were no codes but the mechanical aspect was failing to maintain pressure when starting. After a three tries, it would start and run fine all day. Even parking it for hours, it would start instantly. The problem was usually after sitting overnight that starting was the issue. Anyone have a similar issue? Now, I am having the issue again, no codes, but starts after three tries. I figure the older injectors are now failing (it has 224K). Could it be anything else?

Could be a weak lift pump or tandem pump.

 

[perrya]

No that was replaced. After the injector was replaced, it ran fine. Hoping this will not be it again.

 

[Owain@malonetuning]

Assume you mean these? http://www.idparts.com/injector-rocker-bolts-bewbrmbhw-p-1315.html

Kris @ VM autohaus in Burnaby probably has them.