Apparently I need a new computer for my 1974 2.0 with D-jet fuel injection, Fuel Injection running too rich. Anybody know where to find NOS, rebuilt units or know where to send to repair one? Options

[tumamilhem]

Apparently the computer in my 1974 2.0 is not working properly and making the car run rich. Does anybody know where I can find another one or who to go to have mine rebuilt? It's for a 1974 2.0 with D-jet fuel injection.

Also my 3rd cylinder is misfiring. Would this have anything to do with the computer? If not, any idea what may be causing it to misfire? I have a new working AAR valve installed, my MPS works, no bad wiring in the wire harness or spark plug wires, the timing and dwell are on point and the valves are adjusted.

(IMG:style_emoticons/default/confused24.gif)

[brant]

there should be someone with one in the classifieds
I'm surprised, but anything is possible.

did you ever put an ohm meter on the cht to 100% rule out that the new one you installed wasn't faulty?

[JawjaPorsche]

Pelican Parts

http://www.pelicanparts.com/cgi-bin/smart/...C%2520Each%2520

Have you had your injectors cleaned?

[tumamilhem]

Yes, CHTS ohm reading checks out fine and the injectors are clean. Car was not misfiring before. Idle issue before was the AAR valve. Which was also causing the car to not start once it got hot. My mechanic took it for a drive after and those issues (seemed) to be resolved (will really know about the car not starting once hot after I drive it for a while). But during the test drive, he said the 3rd cylinder started misfiring. New issue I guess. :/

[brant]

I believe the computer is only for adjusting and measuring fuel

I don't believe it has anything to do with spark

pull the offending plug and check plug condition
too much fuel could of fouled it?
but that heavy amount of fuel would still likely point back to the CHT or MPS.

put a spare plug into the wire and check for spark
or better yet, put a timing light onto the wire and check for spark.

brant

[tumamilhem]

Thanks for the tip, Brant. He checked the plugs. They are dry and look good and sparking. CHTS is new and working and MPS is working (was tested by Jeff Bowlsby). The only thing he has found in his research is faulty wiring or bad computer. The wiring is fine so he is assuming it is the computer by process of elimination. Everything else is working as it should. Is there any way to test the computer?

[914itis]

What's the part number on the computer? I may have one

[rhodyguy]

post the ecu #. (IMG:style_emoticons/default/agree.gif)

[JeffBowlsby]

Could be a bad injector on #3...was that checked for consistency and spray pattern? Also, the ignition wires can mess with the fuel injection wiring (EMI) if they are in close proximity...especially the #3. Is the wiring separated?

On the FI harness, if you would want to send it to me I would be happy to check it out to see if it needs anything at no cost other than shipping both ways.

[euro911]

Check/clean the trigger points?

[SirAndy]

Apparently the computer in my 1974 2.0 is not working properly and making the car run rich

I highly doubt it. They *rarely* ever go bad.

And it's not really a "computer" either, there really aren't any sophisticated electronics inside at all.

My money would be on either one or more faulty sensors or broken wiring.
(IMG:style_emoticons/default/popcorn[1].gif)

[euro911]

Jeff, don't you have an ECU test board/box?

[r_towle]

Apparently the computer in my 1974 2.0 is not working properly and making the car run rich

I highly doubt it. They *rarely* ever go bad.

And it's not really a "computer" either, there really aren't any sophisticated electronics inside at all.

My money would be on either one or more faulty sensors or broken wiring.
(IMG:style_emoticons/default/popcorn[1].gif)

(IMG:style_emoticons/default/agree.gif)

You should listen to the advice here, it's most likely not the ECU, which is hardware a/f maps the work or do not.
There is no way an ECU could affect tuning.

Inputs are
Cylinder head temp sensor
Throttle position switch
Manifold pressure sensor
Ambient air temp sensor

If this have all be properly checked, and the FI wiring harness has been checked, along with your ground connections and the fuel pressure, it will be an ignition issue.

Two things mentioned
Injectors sometimes get dirty after 40 years and can stick open
Cold start injectors can stick open all the time and spray in raw fuel

Both of these things can also make it run rich.

Not sure of your location, but there may be better mechanics to bring your car to that are more familiar with D-jet fuel injection.
It's not complicated, and everything can be tested in an hour or so to rule out part replacement methodology

[r_towle]

Just saw you are in Jacksonville Florida.
How close are you to series9 shop?
Joe Sharp just moved there to work at the shop and those two know djet tuning in their sleep.

[stugray]

I have a complete 2.0L FI system with ECU, 5 Green injectors, and all sensors + harness.

I would be willing to part with the entire system, but I do not even know an approximate value.

[rhodyguy]

i would talk to one of the 2 joes at SERIES9. buy new injector seals. they're cheap. and talk to stu.

[Cap'n Krusty]

Make sure ALL the ground wires under the intake plenum are secure on the tabs AND that the wiring integrity at the crimped on connectors is good. Harnesses age, just like everything else, and a compromised ground will certainly cause the symptoms you describe.

The Cap'n

[JeffBowlsby]

Jeff, don't you have an ECU test board/box?

I do, just have not had an opportunity to test it yet. It inteposes the ECU into a complete car set-up...I have a 1974 2.0. :thinking:

[Ferg]

I have one for I think a 73 2.0

part # 0 280 000 037

has not been tested.

Ferg

[r_towle]

I have two bosch Djet test machines if you think that would work.

rich