Fuel Injectors not spraying

[BrokeDownAgon]

Hey All your help would be much appreciated.
I have an 84 Westy with a 2.1 engine but all components of a 1.9 including a digijet ECU.
My engine will not start but is cranking. I have checked for spark and have it. I thought it could be a weak fuel pump so replaced it with a spare and new post filter. Still won’t start. Checked return fuel line and when turning over I have gas cycling through system. (Don’t have a pressure gauge).
Checking my injectors I do not have any spray pattern or leaking. (Bentley 24.26). While checking voltage supply to injectors with test light discovered test light turns on but doesn’t flicker. (24.26)
The Bentley say if voltage supply doesn’t work to check relays (24.32). Everything checked OK and the Bentley indicated had a bad ECU, replaced ECU and still not starting. My grounds at cylinder head are good. On 24.26 under checking voltage supply says to check Hall control unit impulse output to terminal 7.
I could not find how to check the “impulse output” of terminal 7 but did the whole check of the ignition coil to be sure and it’s good(28.32 fig 5 & 6). While checking the hall control unit (28.36) discovered I have no battery voltage between terminal 4 & 2. My hall control unit is a Fairchild build 33. I did all of the test on page 28.36 and was OK. But did not get battery voltage between terminal 7 of HCU and ignition coil terminal 15.

I am confused what is wrong with my Van. I have spark so don’t know why I need to check my HCU but I am still not getting spray from injectors. Any advice for what is wrong?

Thanks for your help (first time posting)!!

[BrokeDownAgon]

Update!
While doing wiring tests on Ecu plug discovered two of my injectors read 20 ohms 2 read 30 ohms. While checking HCU on ecu plug I’m getting .09 volts to HCU Aeg HCU test and Fairchild indicated 0.01 volts. (24.20).
Thanks!

[Wildthings]

If you do not have battery voltage where the good book says you should then determine why.

[dhaavers]

Sorry that I won't be a lot of help, but just wanted to say welcome!
I'm certain a real guru will be along soon... (Mark? WT? ...???)

FWIW: If you pull injectors, can you get anything through them under pressure?

You can usually trigger them with just a small 9v battery... plumb in a can of carb cleaner &
it might tell you a lot. (I did this to diagnose a couple clogged Toyota injectors recently)...

Good luck - keep us posted!

- Dave (55616)

PS: We're heading your direction today...McDougal? Sand? Sullivan? We'll see...


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86 White Wolfsburg Westy Weekender
"The WonderVan"
<EDITED TO PROTECT INNOCENT PIXELS>

[MarkWard]

Too clarify, this engine and engine management system were working fine together to the point where now the engine cranks but does not start?

If so, anything leading up to the point where the engine no longer runs?
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[DanHoug]

[IdahoDoug]

I'm with Mark. Has this van been running along just fine and now this? Or are you in the middle of installing the 2.1 and changing it from the 1.9? That matters a lot. If you're in the middle of an install, some details on that? If it was running fine, some details on what happened?
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1987 2WD Wolfsburg Vanagon Weekender "Mango", two fully locked 80 Series LandCruisers. 2017 Subaru Outback boxer. 1990 Audi 90 Quattro 20V with rear locking differential, 1990 burgundy parts Vanagon. 1984 Porsche 944, 1988 Toyota Supra 5 speed targa, 2002 BMW 325iX, 1982 Toyota Sunrader

[BrokeDownAgon]

Thank you for all the replies! I’m at work now but will try these things out tonight!
The install happened 10 years ago and has been working great. Replaced starter last year to a gear reduction. Van was running great in June. Sat for three weeks and now won't start. I checked with test light how the Bentley says. Don’t have in front of me but will look tonight. Followed the book to the t.

[MarkWard]

I am looking at page 97.55 in my factory manual. The fuel pump relay supplies 12 volts to the fuel pump, to one lead of each injector, and one of the leads for the auxiliary air regulator. So, that would indicate that the ECU is supplying a ground to trigger the injectors.

What is interesting looking at the diagram is that each injector has it's own ground wire leading back to the ECU. It's hard to imagine that all 4 injector grounds would fail simultaneously.

Looking at the diagram, the ECU is getting an rpm signal from the ignition module.

I would find the fuel pump relay and jumper terminals 30 and 87. The fuel pump should run, and then with all 4 injectors unplugged check for power on one of the leads of each injector. If you have power to all 4 injectors, then you will need to look at the ECU side of the problem. All of this assumes the fuel pump is getting power while cranking. Its just a way to isolate if the problem is power supply related or ground related.

A noid light really is almost a requirement to have in your arsenal of tools.
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[tjet]

You really need to confirm the fuel pump is 100% before you start looking at the ECU voltages.

[BrokeDownAgon]

Thanks all!
Problem solved, there was a broken wire between my hall generator and hall control unit. Just needed to buy a new a plug. Problem solved

[djkeev]

[BrokeDownAgon]

Thanks for the tips. Plugs into your distributor.

[Wildthings]

[DanHoug]

glad you found the issue! i'm not sure how you had spark, per your first post, but no injector spraying if this plug was the cause.. any ideas? was it intermittent?
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-dan
60% of what you find on the internet is wrong, including this post.

'87 Westy & '89 Westy both 2.1 4spd

Past projects can be found at--
www.thefixitworkshop.com