I Need Help with L-Jet / AFC Fuel Injection Topic FAQ

borninabus · Posted: Mon Jun 18, 2012 2:48 pm Post subject:

what kind of exhaust do you have & how rusty is it?
_________________
88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport

SGKent · Posted: Mon Jun 18, 2012 3:03 pm Post subject:

dabble · Posted: Mon Jun 18, 2012 3:18 pm Post subject:

babysnakes · Samba Member Joined: August 19, 2008 Posts: 7106

In the Bentley, FI section, p24.Disconnect decel valve wire from atf pressure switch, ground disonnected wire to clean metal and listen for a click at valve. No click-bad valve.

SGKent · Posted: Tue Jun 19, 2012 10:20 pm Post subject:

if it is a MT then there is one hose going to it that tee's into the plenum and shares a connection with the fuel pressure regulator.

http://www.ratwell.com/technical/VacuumHoses.html

Image may have been reduced in size. Click image to view fullscreen.

dabble · Posted: Wed Jun 20, 2012 10:59 am Post subject:

My bus is a 73 with a 78 2.0. GE is the engine code (I think...).

My vacuum hoses don't look the same as the one in the ratwell picture, but I'll check to make sure they're all connected and not leaking.

Does anyone sell a replacement kit for vacuum hoses? Or should I just try to piece together new hoses?
_________________
1973 Westy with a 78 FI 2000cc
[url=http://www.vw-mplate.com/mplate2-9157.png]Click to view image[/URL]

Randy in Maine · Posted: Wed Jun 20, 2012 11:13 am Post subject:

Post a picutre of your engine set up. Also what is the number on that distriburtor you are running?

Westfabulous · Posted: Wed Jun 20, 2012 11:36 am Post subject:

Stuartzickefoose · Posted: Thu Jun 21, 2012 4:36 pm Post subject:

What is the proper technique for setting the AFM at a rough placement as far as the adjustment for enriching and leaning out the mixture? and how should it be set in relation to the throttle body idle adjustment screw?

1978 FI 2.0
see sig line
_________________
Stuart Zickefoose

2011 Jetta Sportwagen TDi 6 speed manual

206-841-7324
[email protected]

SGKent · Posted: Thu Jun 21, 2012 4:48 pm Post subject:

Stuartzickefoose · Posted: Thu Jun 21, 2012 5:01 pm Post subject:

tootype2crazy · Posted: Mon Jun 25, 2012 6:30 am Post subject:

I have been running FI for about 7 months now and it has been great. The problem I have been having is between 2000 - 3000 rpm it runs rough and pops in the exhaust will revving it. It has a tiny flat spot upon acceleration as well. It has great power overall, though. Especially above 3000 rpm its great.

I suspected the AAR, I took it out adjusted and tested it and it is ok. I also suspected a vacuum leak so I checked every single connection yesterday, taking it all apart and putting it back together, no change. I also thought it might be the coil and distributor cap and rotor. A while back while turning the distributor to adjust the timing the cap came loose while the engine was running, destroying the cap, rotor, and coil. I put a used set on that I had in the basement from and old engine. Is it possible that those parts are causing this? The problem has gotten progressively worse from over the last few months, seemingly from the time I put the ignition components on, although I can't be sure of that.

I also checked and greased all the electrical connections yesterday. It did seem to give it a little more pep, but did not change the rough running between 2000-3000 rpm.

Is there something I'm overlooking or that I should test? I have been through the troubleshooting in the L-Jet manual but I just can't pinpoint anything.
_________________
air-cooled or nothing for me
1978 Sunroof Deluxe Bus (daily driver)
1978 Transporter (mom's, making into a camper)
1970 Single Cab 2.1 turbo/EFI 6 Rib, 78 front beam, vanagon backing plates on rear (project)
2001 GTI VR6 (wife's)

dabble · Posted: Mon Jun 25, 2012 9:15 am Post subject:

Went camping this weekend...

Made it 30 miles to work on Friday with no problems - just some intermittent popping/backfiring.

Put in a full day of work on Friday and started the next 60 mile leg of the trip to Anacortes. More consistent popping/backfiring, loss of power, and felt like the engine was missing. Still made it to Anacortes running and mostly happy.

I re-did the timing and checked all of my ignition and vacuum connections on Saturday before embarking home on Sunday.

Trip home on Sunday had much more backfiring and loss of power. Stopped and re-did timing and checked hoses - couldn't see any problems. One thing I noticed was that my vacuum advance was not working when revving the engine up to 3500 rpm.

Driving home and the bus dies on I-5. It starts and runs, but dies when I let off of the accelerator. I checked for vacuum leaks and couldn't find any, timing is set at static because I can't rev it up to 3500 rpm without it dying.

Towed it home and I'm at a loss. Help? Suggestions on a shop to take it to in Seattle? Sad

_________________
1973 Westy with a 78 FI 2000cc
[url=http://www.vw-mplate.com/mplate2-9157.png]Click to view image[/URL]

Stuartzickefoose · Posted: Mon Jun 25, 2012 10:59 am Post subject:

start with the vacuum advance problem...not good
_________________
Stuart Zickefoose

2011 Jetta Sportwagen TDi 6 speed manual

206-841-7324
[email protected]

SGKent · Posted: Mon Jun 25, 2012 11:07 am Post subject:

tootype2crazy · Posted: Mon Jun 25, 2012 11:20 am Post subject:

Stuartzickefoose · Posted: Mon Jun 25, 2012 11:52 am Post subject:

tootype2crazy · Posted: Mon Jun 25, 2012 12:21 pm Post subject:

Here is the AFM:

It looks ok to me.

Also the ignition is nice and steady.
_________________
air-cooled or nothing for me
1978 Sunroof Deluxe Bus (daily driver)
1978 Transporter (mom's, making into a camper)
1970 Single Cab 2.1 turbo/EFI 6 Rib, 78 front beam, vanagon backing plates on rear (project)
2001 GTI VR6 (wife's)

SGKent · Posted: Mon Jun 25, 2012 12:28 pm Post subject:

the red RTV shows that someone has been in there before. Regular RTV has acids in it that cause corrosion in electronic parts. I see some lines in the circuit board although it does not look bad. If the timing is steady and the stumble goes away above 3000 RPM then it could be anything from a wire wiggling to a bad AFM. You can get some electronic contact cleaner from Fry's or Radio shack and spray a tiny bit on the board to see if it gets better.

Were it me I would start with a full tune up including plugs, valve adjust, compression test etc. It could also be a valve or valve seat floating.

tootype2crazy · Posted: Mon Jun 25, 2012 1:00 pm Post subject:

Just a quick question: what should the normal vacuum be? I have a mighty vac with a gauge on it and would like to see if I'm pulling the correct vacuum. Also I would read this on the plenum, right?

The system I bought was used so I'm betting the previous owner of it was having similar problems. I might just spring for a rebuilt AFM to be sure.
_________________
air-cooled or nothing for me
1978 Sunroof Deluxe Bus (daily driver)
1978 Transporter (mom's, making into a camper)
1970 Single Cab 2.1 turbo/EFI 6 Rib, 78 front beam, vanagon backing plates on rear (project)
2001 GTI VR6 (wife's)


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