Petrol injectors. A Godsend or a nightmare!

[jimathan]

Petrol injectors. A Godsend or a nightmare!
Don’t ignore them, they won’t go away. Read on. They can be sorted!

Injector cleaning and testing now available at down to earth prices!


Petrol injectors are NOT fit and forget. They need maintenance just like any other component on your car. Even new ones are not guaranteed to work correctly. New ones are shipped with corrosion inhibitors in them that don’t always wash away when you start your engine. Old ones have problems to. Over time they begin to clog up with varnish type deposits that have been left behind by the lead replacement additives, along with other chemicals that are found in modern fuels.
Many experts agree that injectors need to be cleaned and checked for consistency every 25 to 30,000 miles. (Google it. There’s plenty of info on the subject).
Certain types of engine installation make maters much worse, & in these the injectors will need cleaning more often.
For example. When the injectors are buried deep under cover, or located in such a way that there is little or no air flow around them. This is because when you turn off the engine the injectors are left in poor airflow with little or no ventilation. This allows them to dry out and bake on any deposits that have been left behind.
LPG is worse still because you are driving around without any fuel going through your injectors to aid in cooling.
All this can lead to injector fowling. Likely symptoms will be hesitation or poor acceleration, especially when cold, rough take up after deceleration, loss of power, and poor economy.
This is how it works. Typical five cylinder Volvo.
The injector on cylinder no1 starts to clog up, just a little, let’s not over do it.
The lambda censor now begins to see un burnt oxygen in the exhaust pipe; this is because you are still drawing in the correct amount of air.
The ECU (electronic control unit) now turns up the fuelling to compensate for the weak mixture until the excess oxygen is used up.
We now have the correct mixture on no1 cylinder. Problem is cylinders 2/3/4/& 5 are now being over fuelled. The result is poor economy and loss of power because the engine is no longer running efficiently, not to mention what it is doing to the environment & your pocket!

So what’s the answer?
Well most garages don’t have the equipment to check & clean injectors. Most probably don’t even know they can be cleaned. (or won’t admit to it) Most of them will tell you they are shot at and must be replaced. Ranging from £40 to £140, and even going to close on £200.00 each for some cars, plus vat, plus the mark up at the garage, plus fitting equals well out of pocket.
The truth is that 90% of all PETROL injector problems can be sorted if they are cleaned in the correct way using the correct equipment.
I recently had a problem with my 98 v70 AWD 2.5T that was injector related.
I found someone that specialises in checking & cleaning injectors. At £16.90 + vat each it wasn’t cheep. But it solved the problem & the car runs better than it ever did.
Being a retired engineer, and sick of being ripped off, I decided I was going to build a machine to do the job myself at regular intervals. (I run on LPG). Say no more.
After searching the net and acquiring all the knowledge I needed, I have built a machine for checking & cleaning injectors correctly. The principle of operation is the same as many other commercially available machines costing upward of three or four grand. (Some cost over ten grand.) It uses an electronic oscillator to simulate the cars ECU. It not only does this while testing the injectors, but also while they are being cleaned in an ultrasonic cleaner, while at the same time they are being back flushed under pressure to wash out any debris. (back flushing under pressure is an option on most machines)
I CAN NOW OFFER A CHECK/CLEANING SERVICE

This will restore 90% of faulty injectors to their original specification.
The service will cost £6.00 per injector, £7.00 with new “O” rings. (Additional services can be done, please ask for full details.)
+ £6.90 return
P&P. This is for next day special delivery with extended insurance up to £2,500.00. Excluding (Saturday delivery) Injectors are always returned the same day, providing they arrive before 3pm.
Injectors should be sent RECORDED DELIVERY, and well packed. All the injectors that are returned and stated to be in full working order will be guaranteed to function correctly or your money back. If requested, a report can be sent to your email address stating the condition of the injectors before & after service. This is an “AT COST” 0 PROFIT service to the members of the forum, but please remember that it’s not just Volvo’s that have injectors.
Any injectors not previously cleaned by me may require adaptors making to fit them on the machine. This only takes a day or les and shouldn’t be a problem. Most injectors can be returned same day.
Anyone interested can mail or PM me for further details.
Please see the pictures Below for details of the cleaning/ checking procedures.

All Injectors are pree cleaned in the ultrasonic cleaner before work commences. Most will arrive like this.



Injector spray patterns are observed here. You can see no1 looks to be restricted, no2 is ok, & three four & five are restricted & just making a fine mist.



Now they are being flow tested. Note how uneven the flow rate is


Here they are set up ready for cleaning.



Then back into rig for observation. These look good now. All spraying the same.



Then onto the flow test. This set looks good & needs no further cleaning. Note how the volume has increased on all five. These came from a car that apparently didn’t have a problem! (Not much)



Bagged & ready to go. Job done!



I have some injectors in stock that I can send out on loan for anyone that can’t take their car off the road for three days. I would need pics and numbers of your injectors to confirm compatibility before I could do this. Stock is limited at the moment but growing slowly.