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9dreizig's Avatar
 
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injectors

So I tore off my intake manifold today as I've had the crazy vacuum leak and low boost.. so figured I'd replace all the turbo seals, the injector gaskets, etc..
So my questions is ,, should I have my injectors cleaned ? As long as I have everything apart , does it make sense ?
If so what's a good place to get it done?
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Old 10-18-2008, 04:25 PM
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Yes, it makes sense. I always soaked mine in injector cleaner be used brake cleaner with the red plastic tube stuck in them to get them clean and check the spray pattern.

There was a good write up here (or Rennlist) from someone who did something better. He lifted the pintles with a coil of wire, soaked them in cleaner, and blew them out with air. Repeated until they were good to go.

Do a search and try this first if you want to save some money.

Last edited by A930Rocket; 10-18-2008 at 04:41 PM..
Old 10-18-2008, 04:37 PM
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+1 on the wire holding pintles open, soaking in techron or strong solvent.

Which car are you woring on? If it's the 80 model, you can take the injectors to any diesel fuel injection shop and they will screw right on to their injector tester for Mercedes and etc.

I haven't had much luck w/ the later style screwing on as they have a finer thread pitch which isn't as common on the diesels

The diesel injector tester is OK for testing spray patter as long as you use slow, easy pumps, they are not really designed for the lower operating pressure of the CIS injectors but you can make do in most cases.

If it's the later injectors you can always use a piece of hose and hose clamps to connect the injectors to the pressure tester

Find the thread mentioned above as it gave great pictures and explanations about backflushing through the pintle side w/ them held open w/ wire and that seems like the best approach yet.

If you want to get really silly, obtain an ultrasonic jewelry cleaner and soak them in a glass jar filled with solvent in the cleaner
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Last edited by rsrmike; 10-18-2008 at 04:54 PM..
Old 10-18-2008, 04:51 PM
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Mike, so you fil the unit with water and then place the jar in the tank of water after putting the injectors in to the jar filled with injector cleaner?
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

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Old 10-19-2008, 01:10 AM
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Quote:
Originally Posted by rsrmike View Post
+1 on the wire holding pintles open, soaking in techron or strong solvent.
.....
Find the thread mentioned above as it gave great pictures and explanations about backflushing through the pintle side w/ them held open w/ wire and that seems like the best approach yet.

If you want to get really silly, obtain an ultrasonic jewelry cleaner and soak them in a glass jar filled with solvent in the cleaner
The ultrasonic cleaner made a difference for me. I couldn't get all injectors running properly until some had done about 15 minutes in the u/s cleaner (with water).

I think one of the most important points is to try and do the back-flushing before you attempt to pump fluid through in the normal direction, otherwise you will blow all the crud further into the injector.
That's what originally happened to mine. The shop I took them to gave them a burst in their ultrasonic cleaner and then pumped fluid through in the normal direction to test the pattern. This almost blocked them up solid. They said they were stuffed and I should get new ones. They didn't believe me that the car was running OK beforehand.

This is the thread rsrmike referred to ...
Blocked Injectors - how to clean?
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Old 10-19-2008, 06:22 AM
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So you put them in the tank of water and then thoroughly flushed them out after?
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 10-19-2008, 12:16 PM
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Quote:
Originally Posted by NathanUK View Post
So you put them in the tank of water and then thoroughly flushed them out after?
No, the water is just the fluid I used in the ultrasonic cleaner.
When not in the u/s cleaner, the injectors were being soaked in injector cleaner.
Bill
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1988 Carrera - 3.6 engine (with ITBs, COPs, MS3X) and a whole set of turbo body panels waiting in the attic.
Day job ... www.sspowdercoat.com.au
Memories: '68 912, '72 911T, '80 911SC, '84 911, '85 930, '86 930, '87 911
Old 10-19-2008, 05:19 PM
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So you placed them in the tank of water for 15 mins and then flushed them out with injector cleaner?
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 10-20-2008, 10:29 AM
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Doug Siegel
 
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6 new injectors for sale. $450. PM if interested.
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Old 10-21-2008, 07:20 AM
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