removing the fuel injector bolts
#1
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Hello. Does anyone know how to remove the fuel injector bolts off the S4 intake manifold? I bought new ones. Their is 4 of them and they hold down the fuel injector rails
#2
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They are nuts, and I use a 1/4" drive with a 10mm socket on it.
#5
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You can usually remove stud with the "double-nut" technique. Run a nut part-way down on the stud, run a second nut down until it touches the first, then tighten the two nuts together. Turn the lower nut to remove the stud.
#6
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Wait a minute. Take some pictures of what you are doing, there is no rubber between the fuel injection rails and the intake.
#7
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NOTE use compressed air to blow out the sand from the injector bases prior to removing the injectors.
then use a vacuum cleaner to clean the adjacent areas.
NOTE WD40 sprayed onto the bases of the injectors will make them easier to remove apply this after compressed air
then use a vacuum cleaner to clean the adjacent areas.
NOTE WD40 sprayed onto the bases of the injectors will make them easier to remove apply this after compressed air
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#9
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Wait, stop- don't double nut anything just yet....
Is the engine in your '89 original? There some early '87 intakes that had the double-stud rubber isolators to hold the fuel rails to the intake. And the fuel rails are specific to those early intakes .
The intake pictured in the first thread below is an early '87, there are no ribs flanking the flappy bearing hole.
https://rennlist.com/forums/928-foru...-mounting.html
Another discussion:
https://rennlist.com/forums/928-foru...-s4-model.html
Here's a pic DR supplied that illustrates the fuel rail difference (same part number in PET, but NOT the same part!) Early ('87 only) on top vs. '88-95 on the bottom:
![](https://webfiles.uci.edu/redwards/public/DR%20early-top%20%20vs.%20late-lower%20S4%20fuel%20rails%204-8-14.jpg)
If your intake is an '89 and original to the car, there should just be bare studs inserted into the intake, as below. There is _zero_ reason for those studs ever to be removed from the intake.
Is the engine in your '89 original? There some early '87 intakes that had the double-stud rubber isolators to hold the fuel rails to the intake. And the fuel rails are specific to those early intakes .
The intake pictured in the first thread below is an early '87, there are no ribs flanking the flappy bearing hole.
https://rennlist.com/forums/928-foru...-mounting.html
Another discussion:
https://rennlist.com/forums/928-foru...-s4-model.html
Here's a pic DR supplied that illustrates the fuel rail difference (same part number in PET, but NOT the same part!) Early ('87 only) on top vs. '88-95 on the bottom:
![](https://webfiles.uci.edu/redwards/public/DR%20early-top%20%20vs.%20late-lower%20S4%20fuel%20rails%204-8-14.jpg)
If your intake is an '89 and original to the car, there should just be bare studs inserted into the intake, as below. There is _zero_ reason for those studs ever to be removed from the intake.
![](https://webfiles.uci.edu/redwards/public/S4%20Intake%20fuel%20rail%20mounting%20studs%2010-19-14.jpg)
#10
Nordschleife Master
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To compensate for the shorter fuel rail legs, they used spacers:
![](https://cimg4.ibsrv.net/gimg/rennlist.com-vbulletin/884x663/img_3451_823e8c31ce6dc0fc7cf73aefedd61b355c1cf491.jpg)
![](https://cimg5.ibsrv.net/gimg/rennlist.com-vbulletin/1024x768/img_3452_82f4796d72b3e885e90586df118ddb62b1c406f4.jpg)
(I did this to my '89 back in '08
![banghead](https://rennlist.com/forums/graemlins/banghead.gif)
![](https://cimg9.ibsrv.net/gimg/rennlist.com-vbulletin/1024x768/img_1058_ec73abac45c668570a224c21bd4b921fe0c73e3f.jpg)