Djet - No start, Where to next Options

[slu234]

This is my barn car that has been sitting for 30 years. It is a 1970 1.7L stock D-jet FI. I pulled the engine and also the FI wiring harness to freshen up some sheathing and a few terminals. Here's the list of FI and ignition repairs/replacements done. Engine back in last month and still sorting a few things out...

The engine did run (rather poorly though) before all of the following.

-New plugs, wires, points, condenser, rotor and cap.
-New blue coil
-New fuel pump and hoses
-Added fuel pressure gauge in line.
-Fuel pressure at 30psi - jumpered fuel pump at relay to set
-New vacuum hoses
-Verified all ECU connections using Bowlsby's checklist on his site (although had no help to verify both trigger points operation while cranking - not cranking, had one side open and one side closed)
-Fuel injectors were sent out about a year ago for cleaning - were put back in and run but have been sitting since then (possibly clogged??)
-New vacuum advance/retard canister
-Static timing done and points gap set for initial start up.


The engine will turn over easily by the starter and will run for a short burst on starting fluid. I do not hear the "brrrrrrr" or "clicks" of the FI's clicking as the throttle is opened (i did verify that the TPS is connected and working while going over Bowlsby's checklist).

Are my FI's stuck or clogged, ECU dead, what else?? (IMG:style_emoticons/default/headbang.gif)

Where next?

I am so close to getting this thing on the road after about 2 years of sorting things out. I would greatly appreciate any direction.

Thanks guys!

Brian

[detoxcowboy]

I would check your actually getting fuel to the injectors first (be carefull), you say it starts and runs with starter fluid.. raise the static timming a tad.. hold the pedal down when your starting it.. then of course check spark but you say it will run so.. cht connected properly?

Trouble shooting
Preliminary checks
Prior to trouble shooting the fuel injection system, check the following items:
l Battery condition.
l All electrical connections.
l Hoses or mating surfaces for vacuum leakage.
l Fuel lines for leakage.
l Ignition system.
l Idle speed and mixture.

Trouble shooting;

Engine Will Not Start, Fuel Pump Inoperative

Check the following: Defective fuse, fuel pump. fuel pump relay, main relay or electrical
circuit. Fuel pump relay should click when ignition is switched on and off. Should have
voltage from main relay terminal No. 87 to fuel pump relay terminal No. 86. Fuel pump relay
terminal No. 85 should have good ground from ECU.
NOTE: Fuel pump operates approximately ½ to 1 second after switching ignition on.
Relay is grounded from ECU. Ensure fuel pump operates during cranking.


Engine Will Not Start, Fuel Pump Operates

Check the following: Defective wire to starter terminal No. 50, Manifold Pressure Control
(MPC) sensor and/or wiring, temperature sensors and/or wiring. Inadequate pressure in main
fuel system, wire connector for distributor contacts disconnected and/or open circuit. Pressure
should be 28 psi (2.0 kg/cm2) with starter operating.

d-jetronic go through procedure..

http://www.rennlist.com/techarticles/djetronicfuel.htm

trouble shoot pdf.....

http://www.agua.nu/ds-files/tony-jackson/g...bleshooting.pdf

and a touch more, it sounds like your very close with just 1 issue.. re-post again with more info on further attempts..

#1 All Porsche 914 Throttle Position Switches (TPS) have only 4 electrical wires, but later cars had 5 pole wire terminal connector housings with one blank pole. A 4 pole TPS wire terminal connector housing can be installed into a 5 pole TPS, the wires are in the same order, just locate it correctly.

#2 Wire terminal connector housings are either indexed so they cannot be installed wrong (polarized), or it does not matter how they are oriented as long as they can be inserted into the FI component (non-polarized).

#3 Wire terminal removal from the wire terminal housings takes special tools and knowledge to avoid destroying the wire terminal. Trying to remove them, you'll only be lucky half the time, mostly the wire terminal locking lances break, making the electrical reconnection impossible or untrustworthy.

#4 TS=Thermo switch (1 pole), TTS=Thermo-time switch (2 pole), CSV=Cold Start Valve
Wiring for the CSV and TS/TTS is within the FI harness, but is controlled by the regulator plate, not by the ECU (Engine Control Unit).

#5 The CHT sensor (TS2), if disconnected or an open circuit, will not allow the car the start.

[slu234]

I would check your actually getting fuel to the injectors first (be carefull), you say it starts and runs with starter fluid.. raise the static timming a tad.. hold the pedal down when your starting it.. then of course check spark but you say it will run so.. cht connected properly?

Trouble shooting
Preliminary checks
Prior to trouble shooting the fuel injection system, check the following items:
l Battery condition.
l All electrical connections.
l Hoses or mating surfaces for vacuum leakage.
l Fuel lines for leakage.
l Ignition system.
l Idle speed and mixture.

Trouble shooting;

Engine Will Not Start, Fuel Pump Inoperative

Check the following: Defective fuse, fuel pump. fuel pump relay, main relay or electrical
circuit. Fuel pump relay should click when ignition is switched on and off. Should have
voltage from main relay terminal No. 87 to fuel pump relay terminal No. 86. Fuel pump relay
terminal No. 85 should have good ground from ECU.
NOTE: Fuel pump operates approximately ½ to 1 second after switching ignition on.
Relay is grounded from ECU. Ensure fuel pump operates during cranking.


Engine Will Not Start, Fuel Pump Operates

Check the following: Defective wire to starter terminal No. 50, Manifold Pressure Control
(MPC) sensor and/or wiring, temperature sensors and/or wiring. Inadequate pressure in main
fuel system, wire connector for distributor contacts disconnected and/or open circuit. Pressure
should be 28 psi (2.0 kg/cm2) with starter operating.

d-jetronic go through procedure..

http://www.rennlist.com/techarticles/djetronicfuel.htm

trouble shoot pdf.....

http://www.agua.nu/ds-files/tony-jackson/g...bleshooting.pdf

and a touch more, it sounds like your very close with just 1 issue.. re-post again with more info on further attempts..

#1 All Porsche 914 Throttle Position Switches (TPS) have only 4 electrical wires, but later cars had 5 pole wire terminal connector housings with one blank pole. A 4 pole TPS wire terminal connector housing can be installed into a 5 pole TPS, the wires are in the same order, just locate it correctly.

#2 Wire terminal connector housings are either indexed so they cannot be installed wrong (polarized), or it does not matter how they are oriented as long as they can be inserted into the FI component (non-polarized).

#3 Wire terminal removal from the wire terminal housings takes special tools and knowledge to avoid destroying the wire terminal. Trying to remove them, you'll only be lucky half the time, mostly the wire terminal locking lances break, making the electrical reconnection impossible or untrustworthy.

#4 TS=Thermo switch (1 pole), TTS=Thermo-time switch (2 pole), CSV=Cold Start Valve
Wiring for the CSV and TS/TTS is within the FI harness, but is controlled by the regulator plate, not by the ECU (Engine Control Unit).

#5 The CHT sensor (TS2), if disconnected or an open circuit, will not allow the car the start.

All good stuff....Thanks!

I should be able to get back to the car in the next day or so..


- the fuel pump does run for 1-2 seconds when the key is turned.
-Fuel pressure does rise when the pump runs for the 1-2 seconds (30psi)
-FI harness has been verified 2 to 3 times terminal to terminal with meter on the bench and on the engine
- have verified that the TPS is wired correctly - seeing open/close circuit pulses through throttle movement - by using meter attached at ECU plug terminals
- have verified CHT, and TS from ECU plug terminals

I'll pick up the few remaining checks you have listed and will get back with my results.

Will probably need to pull the injectors and crank to see if they are in fact pulsing fuel. It puzzles me that I do not hear the enrichment injector pulses when I open the throttle, especially when everything else is checking out on the wiring.

I'll go over it again.....

Thanks for your help - detailed and much appreciated.

Regards,
Brian