Fuel injection help!!!

[72squareguy]

Hey fellas, just checking in here. I haven't done anything with the squareback these passed 2 days. I've been busy working on a friend's 68 type 1 that's been sitting in my garage. All I've been doing is starting up the squareback just to move it. Still starts right up everytime. I have that other MPS on it's way. It looks just like the E system MPS. The guy said it says "72-73 VW" on it. So it sounds like an E component to me. Then my next thing I'm gonna do is carefully try to pull out the little female connectors out of the plastic connectors for the injectors and see what they look like. Clean them and try to tighten them up. I will keep you guys informed when I do that.

[72squareguy]

Okay guys here's my latest. Yesterday I screwed with it for a bit. I put my other throttle switch on yesterday and adjusted it per bentley. I noticed it's a aftermarket replacement from God knows when because it doesn't have the VW part number on it like my other one. It only has the Bosch number. Anyways I did that and screwed with the injector connectors with a small pick. I tried to just scratch them up a bit to get some scrap off them in there . And tried to squeeze em together for a better connection. I also did the same with the trigger contacts connector. I put the original distributor back on and set timing the timing as best as I can. The timing is still jumping around dramatically. I went to drive it, it did it's litter rev limiting thing once it got to that rpm. I floored it, it sputtered then it finally worked passed that issue them rpms increased normal. I tried to do that in second gear. It was not having that.!! So I guess I can say I got somewhere.

My roommate is telling me to just put the carbs back on it. I say no! I want to keep the original F.I

[KTPhil]

[72squareguy]

[KTPhil]

Good question... odd coincidence for it to happen with two distributors, but that would seem more likely than a worn drive gear or dog.

[72squareguy]

So I have another dumb question, a different fuel pump wouldn't cause weird issues right? For example, I didn't put an original style pump on it I couldn't find one so I bought a late model type 4 inline pump for it and of course just ran the plumbing different. (by putting the return line straight back to the tank) But still set the pressure to 28 psi. I know the original pump's plumbing was different. I'm sure there's a reason they did it that way right?

[Donnie strickland]

The type of fuel pump wouldn't be the cause, no.

VW/Bosch wanted to make sure there would be sufficient fuel supply for the injection system, but after several years they went to the later style, once they were sure there would be no ill effects.

I, and many other Samba users, run the Airtex E2000 pump, and run the return straight to the tank.
_________________
71 Elm Green FI A/T Squareback

[72squareguy]

[Tram]

[Donnie strickland]

[72squareguy]

Now I know that motor does that a little bit more compression than stock. (.050 fly cut heads)
Now that wouldn't screw with it would it? If anything its getting more vacuum ?

[72squareguy]

So it's also doing this weird thing at idle. It'll jump up and down every so often. I'm gonna take a video of it here shortly and post it.

[72squareguy]

Here's a video I just did. The first voltage on the meter is what my generator is putting out and second is at the primary side of the coil. You can hear what the idle is doing. It'll seem to idle a little high then when you bump the throttle with your hand as I did, it'll go down.... then it'll kick back up. you can hear it at the end of the video. I can't find a vacuum leak anywhere. I've been using a can of carb cleaner with a straw and sprayed it all over it could leak. Nothing changes the idle.
I'm guessing this problem is probably related to the driveability problem I've had.

https://youtu.be/CB4MLGOtBrw

[Hip2besquare]

I had a very similar situation happen on my 73 squareback, it wound up being a bad condenser on the distributor after I replaced that it ran like a champ. I tried everything just like your doing but after replacing condenser it cleared right up.

Richie

[72squareguy]

[72squareguy]

So I wanted to re check fuel pressure. I went and bought another gauge because my other one is all screwed up so I tossed it.
Then I come home to recheck pressure and found this....

So I think.... some of a bitch!!!
I was all excited thinking "I found the problem". I bumped it up to 28 psi. And of course with my luck.... it didn't change a damn thing....

[KTPhil]

My brief experience with fuel pressure that low is that it runs, but runs roughly and smells rich, even though it is actually running lean. Mine wasn't burning the coarse low pressure mixture so the exhaust stank of fuel. Yet it didn't actually have enough fuel to burn and run right. Bumping it back up to 28/29 made a big difference. So if yours didn't change, I wonder what else is wrong that made a lean/coarse mixture not make a difference.

[72squareguy]

[FastbackFynn]

[KTPhil]