RE: [DML] Injectors
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RE: [DML] Injectors



Roger, When cleaning and testing injectors you have to have the right
equipment like the Bosch injector tester. Page 60 of the technical manual
the opening pressure will be around 3.5 bar. You most likely blowing 100+
lb's thru them to obtain a pattern will not work. The rest holding pressure
should be after 10 min should be 1.7bar.
I charge $79.95 to clean and test pattern and holding pressure and install
new boots. If they won't clean then the cleaning is free with the purchase
of new in injectors at $390.00.
John Hervey
www.specialtauto.com




-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
dmc12rb
Sent: Thursday, October 19, 2006 4:00 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Injectors

What should the correct fuel pressure be (at the injectors)?  

About 800 miles ago I had the injectors in my D cleaned/tested by one 
of the vendors. (This was done at the same time I replaced the water 
pump and the car has not run the same since then. Horrendous gas 
mileage, a popping sound in the exhaust and poor acceleration.)
 
I have cleaned the injectors in a ultrasound cleaner, using a Techron 
concentrate. While testing them after the cleaning I occasionally 
notice an incomplete spray pattern when blowing compressed air 
through them. Changing the pressure appears to have an effect and I 
am curious about the cause.
 
My test method is far from scientific, using compressed air and a 
makeshift contraption to connect it to the injector. It appears that 
I need about 70 PSI to get anything through the injectors. Does 
anybody know of a reasonably priced spray pattern tester or have any 
other suggestions? (Yes, I know that I can have them cleaned and 
tested by a vendor again -- or buy a new set for about $500, but I 
would like to know if I have an injector problem or not before I take 
that step.)
 
Roger
VIN1074 





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