1974 Fuel Injection flooding the cylinders?

[bobswei]

I recently acquired a '74 914 2.0L that's been sitting for quite a while. I just sorted out ignition issues and now have fuel injection problems. It will start "one" time when dead cold. Runs very rough and the obvious smoke out the back. It wont start anymore and has wet, dark plugs after that. It will stumble a little but not enough to start. When I got the car, many of the vacuum lines were not connected. I reconnected the MPS, decel valve (I think that's what it is) and all the lines going to the air cleaner (just re-installed) and then I dry the plugs, let the cylinders air out for a while but wont start till the next day.
Any ideas where to start?
Thanks....

[beatnavy]

So it will start and run for a few minutes? It dies and then won't start again until cold?

Most likely cylinder head temperature sensor (CHT). You may have other issues, but this is a classic symptom and problem. There's a hole in the tin near the spark plug for #3. There should be a wire lead coming out of that hole. When cold resistance is high on this circuit and tells the ECU to richen the mixture. If the CHT is bad, or disconnected, the mixture will stay rich as the car warms up and flood.

There are lots of threads on CHT. Let me see if I can find a good one for you to read-through.

It's possible your MPS is bad, but it definitely needs to be hooked up and functioning (when they fail, the mixture goes very rich). Probably need to test your MPS, but I'd go with CHT as the most likely culprit.

Edit: Read THIS THREAD. There's enough info in that thread that is applicable to you and what sounds like may be a CHT issue.

[bobswei]

Here's the update: First, I read through the link you sent and thought I would try the CHT ohm test. It sat most of the day so I disconnected the CHT. I measured it at 19.7 ohms and fluctuating. Doesn't sound right and I know little about electricity. Then, I started it without the CHT connected. It ran fro about 2 seconds then died. Wont start anymore. Kinda hard to believe that 2 seconds of running makes a big temp. difference. I measured for ohms again and it was around 19.0 and fluctuating. How do you remove the CHT? I see, it unscrews so maybe a deep socket and a wrench (so the wire can come through the socket)?
Thanks for the response.....

[beatnavy]

The CHT should read as follows when you use an ohmmeter (one lead of the multimeter connected to the wire lead, the other to the engine case):

P/N 0 280 130 003 and 0 280 130 012 (Stock for 74 2.0 DJet): about 2.5 K ohms at 68 deg. F, less than 100 ohms with hot engine.

P/N 0 280 130 017 (With stock 73 2.0 DJet): about 1.3 K ohms at 68 deg. F, less than 100 ohms with hot engine.

If it's measuring only 19 ohms when cold then it's not reading right. But it may not be your primary or only problem. To remove the CHT you need a deepwell 13 mm socket and bundle up the wire lead inside the deepwell. When you reinstall, be VERY careful not to thread it correctly. Stripping is a PITA to repair and requires dropping the engine in all likelihood. New CHT's are about $22 and they do fail. If you can't get the lead bundled up inside the deepwell you can also grind the corner off of a 3-inch socket extension and lead it through there.

There's a whole lot of other things you can test as well. Do you have a vacuum pump? Next step might be to test the MPS can hold a vacuum.

Also, have you verified valve settings, dwell, and timing? These things are important before doing a ton more troubleshooting.

[beatnavy]

Also, please read Anders site: D-Jet Troubleshooting.

Awesome resource.

[bobswei]

Hum, I had one lead connected to battery terminal ground.
Yes, I have a vacuum pump. I will try that also. May not be till Thursday before I get a chance to try anything. Also, considering getting a CHT.
Today, I only had a few minutes so tried to start it dead cold. Sputtered but didn't start. Then, nothing. Yea, I set timing by flashing the points. Not sure how close it is or if I did it correctly.
I think, I did come across the trouble shooting article.
I will try again in a few days.
Thanks for the info.....