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Latest on the Djet runnability (archive)
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Posted by Robert 73 CSi on November 07, 2001 at 21:08:32:

I have not completely fixed the problem with my Djet but wanted to throw my latest observations out there in case it sparks some ideas.

Here are the problems I have fixed with the D-jet:

1. Replaced the vacuum transmitter. Not sure that this did much, but at least I am sure I have a good one.

2. Unstuck the no. 1 fuel injector.

3. I noticed that the car was not starting to a high idle when cold and then settling down to 800-1000 rpm when warm. Upon further inspection I found that the cold start air valve was not working. It sits in a box under
the driver's side of the engine and in fed by a hose off of the heater. This box was plugged at the inlet by scale, this was not allowing water to circulate which didn't allow the air valve, thermo-time switch, or temp sensor 2 to work properly. It also meant the throttle switch was improperly
adjusted. That is all ok now.

The strange thing is that sometimes it runs very poorly, and then sometimes it will get to redline in 1st and 2nd. When it will get to redline it is jerky from 3.5 to 5.5k, then it seems to catch from 5.5k to redline. Sometimes it backfires when you try to push it, meaning that you push it, it will not rev, you give up and step on the clutch, and it backfires. Not sure what that means, yet. I've looked for a PCV valve and have not found one.

I don't think the computer is the problem, but if I had a spare with a red dot I'd try it.

One person wrote me about resistors, there are none on a D-jet external of the resistance in the fuel injectors. The injectors seem good at about 3 ohms. One odd thing - the Djet I think was initially designed for a four cylinder engine. I checked the wiring for the FI's and 1 and 3 seem to be in parallel, 2 and 4 seem to be in parallel, 5 is alone, and 6 is alone. Not sure if this is supposed to be the case. Does anyone out there know better?

Beyond that I am stumped. I plan to pull the plugs this weekend and check them. Also, suspect I may have a spray pattern issue with the FI's but pulling them to check looks like a job and a half. I loaded the tank with gumout, will see if this has an effect.

That's about all for now. If anyone thinks of a possibility I'd be very grateful.

Robert

Regards,

Robert



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