My 79 Super Beetle not getting any electric to fuel injectors

[Inland23]

Hello, I picked up a 79 Super Beetle convertible that was sitting in a garage for 20 years. I replaced the following.

Fuel pump
Fuel Tank
Fuel Lines
Fuel Injectors
DBL Relay

The bug will start for 1 second then die. The cold start injector is working but the cyl injectors are not getting electricity. I've checked all the grounds but still wont start.

Any help?? Thanks!

[VW_Jimbo]

Are you sure you have adequately fuel and spark? Can you keep it running on carb cleaner?

My gut always starts going in one direction on these cars. Check for any cracked or broken vacuum hoses. Then you need to check fuel pressure and volume.

Basics first. Is the white wire at the coil connected to the 1 side?
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Jimbo

There is never enough time to do it right the first time, but all the time necessary the second time!

[Tim Donahoe]

There is a Sticky in the upper portion of the first page of this forum. It’s for Fuel Injected Bugs. You might have good luck there.

Tim
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Let's do the Time Warp again!

Richard O'Brien

[scrivyscriv]

Check the resistor pack. Check the double relay. Check the coil terminals.
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Robert in Memphis
Dünkelgrügen 1967 Java Green bug thread
Engine rebuild thread
If you're ever in the Memphis area, you are welcome to stop by for advice and help.

[Dwayne1m]

https://www.thesamba.com/vw/classifieds/detail.php?id=2185957

This is what the resistor pack looks like. It's located in the engine bay on the inside of the right rear fender behind the tar board.

[sjbartnik]

If indeed the injectors are not firing (have you verified this or are you just assuming this based on what the car is doing?), then my first suspect would be the wire in the FI harness that connects to terminal 1 (negative) on the ignition coil (same side as the condensor). This is the wire that supplies the rpm signal to the ECU. If the ECU does not get rpm signal, the injectors do not fire.

The cold start valve is not controlled by the ECU at all so it would not be affected.

The other thing I would check is to ensure that the ECU has a good ground. The ECU fires the injectors by grounding them so if the system ground points are gunked up (or missing), the injectors will not fire.

The series resistor pack is a good place to check as well, those wires like to fray and break.

Ensure that the double relay is doing its job and supplying power to the ECU when you turn the ignition on. If not, obviously system no worky.
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1965 Volkswagen 1500 Variant S
2000 Kawasaki W650

[Randy in Maine]

And keep in mind that you need to have about 26 psi in the fuel rail for the injectors to even thing about firing.

[sjbartnik]

[Inland23]

Thanks for all the replies.

Checked and cleaned the lead wire from the ECU to the correct side of the coil.
Checked the 26 PSI in the fuel line.
Brand new Bosch dbl relay.

I removed one side of injectors and cranked the motor. No gas spray from the new injectors or the old injectors that were replaced.

I also disconnect a fuel line prior and cranked and showed fuel pumping out.

I Pulled the resistor pack and cleaned the connections best I could.

All Above And Still the same issue.

I ordered a different Resistor Pack $30 and ECI $100 And should arrive this weekend.

Will continue.....

[Randy in Maine]

Have you tried a Bosch noid light?

If you put a dwell meter on there do you get some sort of signal? (Even if you have a "points replacement module" you should some sort of reading even though it won't mean much)

[Inland23]

Thanks. I tried a dwell meter on the injector wire will someone cranks the motor and no electric going to the injector.

[Randy in Maine]

Hook the dwell meter up the green points wire and a known good ground and see that shows anything.

If it doesn't, the ECU is not getting the signal from the points to "fire" the injectors. They fire all at the same time.

[sjbartnik]

[Inland23]

!!!!

Thanks everyone for the great knowledge you supplied for this issue. I checked everything as you requested and the recommendation from sjbartnik discovered the problem!

As I checked the black wire from 15 + to 86c it showed no power.

The bug was sitting inside a garage for well over 20 plus years. The owner died and I was able to buy the bug. I'm guessing he cut the wire under the left side of the rear seat and hide it under the vent? It was a clean cut probably to keep the car from getting stolen!!

Connected it back up and it fired right up!

Thanks again everyone!!! sjbartnik

[sjbartnik]

Glad to hear you got it sorted!
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1965 Volkswagen 1500 Variant S
2000 Kawasaki W650

[Randy in Maine]

Actually a pretty durable set up.

[KKiley]

I love a happy ending to a fuel injected car!
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1978 Super Beetle convertible

Click to view image