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  Topic Review (Newest First)
07-19-2019 03:49 PM
spiderserie4 so are you saying the 'rough running' really only occurs when the car warms up?
07-19-2019 06:44 AM
SkiBum
Quote:
Originally Posted by alfalori86 View Post
Ok Updates! Found fuel regulator its brand new! Disconnected vacuum line and no raw gas. I started the car and got a spray bottle with water and sprayed what vacuum lines i could see no leaks. The car idles fine what I found was after driving it and stopping at a red light it got rough but not immediately at startup while standing.
Looking for a vacuum leak with water doesn't work, need some to be type a combustible liquid. Have you pulled your dipstick to look for an RPM change yet?
07-19-2019 06:39 AM
alfalori86 Ok Updates! Found fuel regulator its brand new! Disconnected vacuum line and no raw gas. I started the car and got a spray bottle with water and sprayed what vacuum lines i could see no leaks. The car idles fine what I found was after driving it and stopping at a red light it got rough but not immediately at startup while standing.
07-19-2019 12:28 AM
spiderserie4 fuel pressure regulator is number 2 in diagram:
https://www.alfabb.com/bb/forums/8158178-post2.html

Top hose is vacuum hose from plenum (apart from checking this for raw fuel, also make sure the hose is not cracked)
Bottom hose is fuel return line.
07-18-2019 01:43 PM
SkiBum
Quote:
Originally Posted by alfalori86 View Post
Where is the fuel pressure regulator?
on the end of the fuel rail, above the distributor.
07-18-2019 01:40 PM
alfalori86 Where is the fuel pressure regulator?
07-17-2019 08:02 PM
GV27 Yeah, just to back up SkiBum and reiterate my point from earlier: no points, no condenser - it's modern computerized ignition. Going to a Petronix unit would be a step backward and highly unlikely to improve anything.

Cap and rotor are a whopping $35.
07-17-2019 04:48 PM
SkiBum He has a 86 with the original L-jet system. No points, no condenser, distributor is basically just a 4 way switch....
07-17-2019 04:44 PM
Calguy 17 I have a 1976 Alfetta GT and recently replaced the original a worn out Marelli distributor with a Pertronix unit.
The installation is very easy as long as you can find TDC and have a timing light. My old GT runs like new
and starts immediately. Gas mileage has also improved. Points and condensers are stone age today. Go with electronic ignition and you will never look back.....
07-17-2019 02:26 PM
SkiBum Also pull the dipstick during idle to see if idle changes. Should drop around 300 rpm. If not, you have a leak somewhere!
07-17-2019 01:47 PM
ballough510
Quote:
Originally Posted by alfalori86 View Post
All great advice and much appreciated. I used the link above to resolve vacuum leaks when I first got it. That is what lead me to replace the air intake duct. Will try the spray bottle technique to be sure i dont have new issues.
Pull the vacuum hose....off the fuel pressure regulator it takes 2 seconds. Do that FIRST!!
07-17-2019 01:42 PM
alfalori86 All great advice and much appreciated. I used the link above to resolve vacuum leaks when I first got it. That is what lead me to replace the air intake duct. Will try the spray bottle technique to be sure i dont have new issues.
07-17-2019 11:38 AM
Alfa69GTV1750
Quote:
Originally Posted by SkiBum View Post
I purchased an L- jet Spider that had been sitting for 17 years. I replaced all the wires, plugs, cap, rotor, along with injectors, fuel pumps, FPR, and hoses but still ran rough. Found a few vacuum lines that were compromised. Still ran rough. Finally found all the vacuum leaks and now she runs fine. I HIGHLY suggest running through the L-jet troubleshooting guide and take nothing for granted. The smallest vacuum leak will make the car run poorly. Good luck! I know you will find your issue...
A great way to find vacuum leaks is with a spray bottle of starting fluid. If you spray it around the various vacuum sources and air ducts a vacuum leak will show up as a change in idle speed. You can also use something non-flammable like brake cleaner. WD-40 works too, but its still flammable and messy.
07-17-2019 10:58 AM
ballough510 Pull the vacuum hose of the FPR and see if the vacuum circuit is full of raw fuel.
The diaphragm is probably broken causing poor idle. Not the ignition at all. Seen it dozens of times.
RML
07-17-2019 09:58 AM
SkiBum I purchased an L- jet Spider that had been sitting for 17 years. I replaced all the wires, plugs, cap, rotor, along with injectors, fuel pumps, FPR, and hoses but still ran rough. Found a few vacuum lines that were compromised. Still ran rough. Finally found all the vacuum leaks and now she runs fine. I HIGHLY suggest running through the L-jet troubleshooting guide and take nothing for granted. The smallest vacuum leak will make the car run poorly. Good luck! I know you will find your issue...
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