914 Fuel Injection

[cjllong]

I have a 75 914 with a 2.0 motor. It originally had a 1.8L, but I acquired a 2.0 from a wrecked 73 914. When the 2.0 was rebuilt and installed, the mechanic installed the 1.8L fuel injection system and told me it was superior to the 2.0L fuel injection system. I drove the car for 2 years and never had a problem. All of the sudden, the car wouldn't start. I took it to a local German auto mechanic, (The guy who originally did the conversion left town), and he said he would fix it. Well.... A new fuel pump, plugs, other stuff, and the big one.. a new computer, the darn thing still has the same symptoms. It simply dumps fuel into the valves when starting, causing it to flood almost instantly. He checked the fuel pressure regulator and it seems to be fine. He's telling me that the computer is holding the injectors open too long, causing excessive fuel to flood the motor. $1300.00 later, he says he'll do the rest of the diagnosis for free. I think I payed for his education of the 914 fuel injection system, and I don't think he learned anything. If anybody out there had the same issue, please help me! I am extremely desperate!

Chris

[bowlsby]

Could be one or more of several things.

Leaky injectors or cold start valve?
Bad engine temp sensor?
Miscalibrated AFM?

Putting a 1.8L injection on a 2.0L engine is not a good thing even if the parts are more modern, unless the system was properly calibrated for it. If it is a stock 1.8L setup unmodified I would hink you would be lean most of the time.

I am more familiar with the D-jet system, you might try the 914world.com site, there are a couple of L-jet Gurus there. Ask for Clay Perrine.

[Tobra]

AFM would be my bet.

Most of the L jet(what you have)style FI can be checked with a ohm meter. Excessive resistance in wiring also strong possibility

[cjllong]

Tobra,

What is AFM?

[maddeye]

here

[cjllong]

Thanks for the help,

I'm assuming the AFM is the Air Flow Sensor. I almost fell out of my chair when I saw the price! Where exactly is the AFM and is there a way I can test it? I tried to find it on the various diagrams, but I couldn't. All your help is greatly appreciated!

Chris

[Dave at Pelican Parts]

Dig out your Haynes manual, it has procedures for tsting the 1.8's EFI bits. There is a resistance test for the AFM. You can also push the flap in it open by hand and see if it sticks anywhere; if so then is needs to be replaced.

The AFM hangs off the side of the air cleaner. It's got a quarter-circle "bump out" on the side, and an electrical connector.

--DD

[Tobra]

A fair number of remanufactured(Python was firm, midamerica the vendor) FI bits recently came on the market for VW's, which is likely quite similar to those used on the 914. Also some new stuff. For example, this looks like a pretty sweet fuel new german pump

It is air flow controlled, but temperature dependant. Those are old sensors with *****ty wiring, check those too. The club/world has something that will help you. I think you need a test light too.

The shop manual for the Superbeetle has a whole chapter on L jet, complete with a portly bald German gentleman indicating the air cleaner in one photo, which has a dinky little opening for how big it is. The air cleaner, not the guy.

[IROCPORSCHE73]

why not just go to carbs man ? Good luck

[Conrad W Peden]

For the 6-800 bucks for carbs and a switching to an appropriate cam, I'd stick with FI

This is coming from a formerly pro-Carb guy. Now with a 73 2.0 with FI

[RandyLok]

Originally posted by IROCPORSCHE73
why not just go to carbs man ? Good luck

FI is far superior to carbs for a lot of reasons, especially with a stock cam.

While LJet on a 2.0 isn't the easiest combination to optimize, it can still be made to work better than carbs.

Wait... Did I see this car on Ebay recently?

[Bleyseng]

Check the CHT first of all.....

[bluemm]

CJLLONG. I have a Pelican rebuilt (just like new)AFM that I bought 1 year ago but never installed because of other issues with my fuel injection. I converted to carbs. This AFM is still in the box. If you can use it let me know and I will sell it cheap.