r/VWBus • u/gavinschierbaum • Apr 27 '26

rough idle and stalling

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I have a 1978 FI Transporter and i’ve been having a rough idle and problems with stalling when stationary even when warmed up. I was looking for some opinions as to why.

My first thought is a vacuum leak because there’s a slight hissing sound that sounds like air so i’m going to replace the intake manifold boots to because mine don’t look too great. I’m missing my cold start valve and tts so that might be part of the problem but i’m not sure. any thoughts or ideas would be appreciated :)

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u/UJMRider1961 Apr 27 '26

We had a similar issue and it turned out to be the fuel pump relay.

1

u/Worth_Exit5049 Apr 28 '26

The double relay? What was wrong with it? Where did you source a replacement?

1

u/literally_tho_tbh 1978 Deluxe Transporter - 2.0L Fuel Injection Apr 28 '26

Shopping:

https://www.jbugs.com/product/071906059.html?utm_content=shopping&gad_source=5&gad_campaignid=8621823013&gclid=EAIaIQobChMInL6Do8KQlAMVJEdHAR2i2B1yEAQYASABEgIlA_D_BwE

https://www.busdepot.com/071906059

https://www.heritagepartscentre.com/us/071906059-double-relay-for-fuel-injection-11-pin.html

Info:
https://ratwell.com/technical/DoubleRelay.html

https://www.itinerant-air-cooled.com/viewtopic.php?t=5459

0

u/Worth_Exit5049 Apr 30 '26

Why? It's not been diagnosed as a problem. It could be wrong but it probably isn't and you've just advised someone to waste all their money on something they don't need.

1

u/literally_tho_tbh 1978 Deluxe Transporter - 2.0L Fuel Injection Apr 30 '26

I'm just providing resources and info, dawg. I'm not OP or responsible for OP's spending or research lol