Problems after changing fuel lines

[DS1980]

Hello Vanoganarians,

I just completed replacing the fuel lines in my van and now I am having engine problems I did not expect. It starts fine and revs perfectly fine. When shifted into first gear it begins to backfire/frontfire (through the induction system) a few moments after moving forward. When shifted into second gear, the engine looses all power.

I replaced the fuel lines as well as replaced the injectors. I removed the air box and distributor cap to complete the install. These went back on as before.

Anyone have an idea of what could be causing this? It ran like a top prior to me "improving it."

[markswagen]

Did you pull the wires off the spark plugs or distributor cap.
Firing order is 1-4-3-2,
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markswagen {mobile mechanic} san diego area all early VW's cared for.

619 201 0310

[DS1980]

Pulled the cap. I checked all the wires and connections. No change.

[markswagen]

Check the plug on the the injectors, and air flow meter, make sure they all click when you push them on
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markswagen {mobile mechanic} san diego area all early VW's cared for.

619 201 0310

[DS1980]

OK, this part is making a loud buzzing noise and is connected to the induction system. What is it and is it supposed to buzz? I've never noticed the noise before

Also, are the power window lights supposed to be on all times the key is on?

Great, starting to understand the joys of owning Vanagons.

[Silverghost500]

That the idle control valve, and it does buzz as the idle control module adjusts the valve back and forth.

Double-check fuel line routing from fuel pump to engine bay, and then the routing to the T fitting, injectors, and fuel pressure regulator. Also make sure the electrical connectors to the throttle position sensor, air flow meter, and all your plug wires are seated properly.
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1986 Volkswagen Vanagon Westfalia "Von Westy"
Honda K24A converversion-Road Testing Phase
3-Speed Automatic

Von Westy YouTube Channel
https://www.youtube.com/channel/UCbhyZYxJEQrUuLnMbLleeIA

[Gruppe B]

Check the distributer vacuum hose that goes from the distributer to the intake manifold. I've knocked off this hose swapping fuel line causing a big vacuum leak.

Make sure the distributer cap is properly installed. Undo the clamps and see if it turns left or right. If it does it is not installed properly. There is a notch that must be lined up before putting on the clamps

[0to60in6min]

check the AFM harness connector, make sure it's well connected to the AFM.

[MarkWard]

[DS1980]

Is this what is being referred as the AFM sensor?

I do not see a vacuum line coming from the distrubutor. I do see an unused spade connector. Is this supposed to be connected to something?

[Phaedrus]

Have you tested your fuel flow and pressure at the left injector rail? Take a run of 5/16" hose attach at the test port and check for fuel flow with the key in the on position and the AFM flap held open. Make sure flow looks good. I'd also check for good pressure while you're in there. You want around 30-40psi. Did you plug the injectors back in appropriately? Did you accidentally pinch an o-ring so that there's a small vac leak at one of the injector tips? Did one of the rubber stops on the injector body slip down or up, causing the injector to not seat flush in the intake?

Sounds to me like you have a fuel supply issue. If it starts and idles strong, and revs good under no load, it's not likely a spark issue. Unless you effed up your timing when putting the dizzy back in. Did you put the dizzy in backwards? Did you check your timing after reinstalling?

That spade on the dizzy is superfluous. A spare ground.
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1986 WBX (Tin Top Camper)

[kamzcab86]

[DS1980]

OK,
After a test drive I think it is fuel pressure related. A new filter is in the mail. Where is the test port and what is this flap? Is this a procedure in the Chiltons?

[Phaedrus]

[Gruppe B]

[DS1980]

I don't see the test port you are talking about.....

[Gruppe B]

[DS1980]

Ah, I opened that to relieve pressure before doing all this. I gotcha now.

I have a new fuel pump on the way as well.... So it looks like when the original pump went out, someone just added a second pump after the filter instead of replacing the factory pump. I'm going to bring it back to stock and then see what pressure I have at the test port.

[shagginwagon83]

Two pumps mean it doubles the horsepower right?
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Brandon
"Jo Ann" - '83.5 Westfalia EJ22e w/Peloquin
Instagram @joannthevan

[DS1980]

I can confirm this as untrue, although I'm starting to think of the van as not a slow vehicle, but rather a very fast 2 bedroom, 0 bath apartment.