hitbyastick

I just read a few posts regarding this problem that I have. It's on my 74 2.0 with stock D-Jet. Car starts great, idles very well, cold or hot. Once I blip the throttle it sounds like it's dieing for a second, then comes back. Sometimes when I cruise it starts bucking. I've gone through the usual suspects but I can't get this resolved.

Things I've done:
Complete tune-up
EFI trigger points
Throttle body adjust
CO Adjustment
Checked compression which came out great
Timing adjusted
Breaker Points replaced
Checked for vacuum leaks 100 times over
Cylinder head temp sensor replaced
Measured just about every resistance on every component I could find
Fuel pressure checked and adjusted
Fuel and air filters replaced.

So far everything checks out. If I'm cruising and it bucks, more throttle takes care of it and it pulls very strong.

Do fuel injectors wear out? Maybe I need to get a set.

If anyone has a suggestion of something I missed, please let me know. Or if not, maybe I'll get a set of webers because even though the car is completely original (minus the color and the engine rebuild), I'm getting tired of messing with the ol' D-jet

--Christoph

racer

Failing TPS?

hitbyastick

I've replaced it with two other ones that I had lying around with no change.

racer

When you've replaced fuel filters, are they clogged? Perhaps crud in the tank is an issue? Can you see any rust when you look in the tank?

Matt Romanowski

You can get the injectors cleaned. Somone mentioned a good place in Peter's injector thread.

hitbyastick

Fuel tank is clean with absolutely no rust. Filters always come back clean also. I also re-did all the fuel lines when I rebuilt most of the car. I think I'll play with the injectors and see if that helps at all.

Peter Zimmermann

Just curious, did you check the ground strap between the tail of the transmission and the body?

hitbyastick

I just looked at it. It's not rusty or anything, just really, really greasy from a broken CV seal a couple of years ago. I'll run to the parts store this weekend and grab a new one and clean all the contacts.

Is there a way to backflush those injectors?

Peter Zimmermann

Honestly, your problem doesn't sound like injectors. That said, the only thing that I've done with old 914 injectors is to fill them with PB Blaster and let them soak for half a day. When I drained them I did get some crud, but ended up buying a set of "rebuilt" ones.

I've experienced the issue you're dealing with, but it was so many years ago (at least twenty) that I haven't been able to recall what we did. I seem to remember that it was something silly like a loose wire/bad ground with the fuel pump circuit, bad fuel pump relay...that type of thing.

Next time that you experience the problem, wiggle the ignition switch key (don't try to accelerate, keep the problem at its worst) gently, without actually turning the key off. DANGER, you don't want to turn it so far that the steering locks!!!

racer

How old is your relay board? I had to replace mine on my '76 a few years ago. Looked find from the top, looked like a dried up lake bed on the bottom (you know, where you can see the connection wires )