Q: Tuning Air/Fuel Mixture on 1977 Bus with Fuel Injection

[Bleyseng]

[equinox]

Hey guys,

I REALLY appreciate your help and you are just as frustrated I am.

It's been a multi-year endeavor to try and get this thing "reliable" so I can use it and camp. It's 7/15 and the Summer is once again clicking away, but hope to finally get this resolved.

There's been a LOT done and have to be down to the final item(s). I've gone soo far as to have the geometry measured and push rods cut to proper length by a racing company! Almost everything has been replaced and brand new and why very frustrating. It sucks to have had multiple (experts) in the engine, MONTHS at a time with them, and still not resolving the root issue...poor gas milage and not running right at speed and idle and assuming whatever it is a rich condition.

I've taken it to an exhaust company and had a bung welded on and addl O2 sensor installed and bought a unit to measure air fuel ratio and rpm. Soo, there's no question, I'm trying and spending a lot of month and just not getting it resolved.

I have NO problem hiring Colin (or someone) if they can get it fixed. However, when I inquired before, it seemed some folks were out of the state even and would need to be coordinated, but had found a new tech/machanic and closer than the last, so waited to see if they could solve it yet. If we can still coordinate something...I'm all for it!

As far a pictures, I'm a little bewildered!! I thought I had someplied them previously and also recently with URL links to my Google Drive Cloud!!! Is that not correct? I will need to check and if applicable, supply more.

I agree, as indicated, we need a systematic approach and the manual is it. I'm currently following along and have already posted some significant results on readings thru the harness as well as things such as confirmation of the AFM and engine temp sensor (which was replaced last year as the old one was confirmed not working and reading like 20k ohms and super cold condition!

Moving forward, let me take photos, let me read and confirm the photos and information you supplied, and follow the manual. With your support, hopefully we can get this resolved and understand exactly what the hell was the issue and has been for years!

[aerosurfer]

Along the top of the page is a tab called gallery...

Drop down to add photos

Give it a name, select the appropriate category

Choose files from your computer or simply walk out to your bus with a camera phone from the last few years, take said photos and the thenly select them into the page

Push upload.

Once they are uploaded add a post to this thread. Below the text box is a link that says 'insert photo from my recent Gallery photo'

Click each insert button for the photos...
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Rebuild your own FI Harness..My Harness

77 Westy 2.0L Rockin and Rolling Resto!

72 Sportsmobile (sold)
79 Tran$porter... Parts car money machine (gone)

[Hoody]

I have not read through all of your thread. And I don’t mean to throw more fuel on the bonfire of money that you have already spent. Perhaps you have already done this but if you have not it could be what is causing every mechanic to chase their tales. Being that your FI wiring harness is 40 years old. You can check continuity all day long with the harness removed. Things will appear to be just fine. But when the engine compartment gets hot, the engine vibrates, and the engine itself gets hot that harness can have wires in it that most likely have cracked insulation. The entire FI system electrically is dependent on the harness working flawlessly. You could have multiple wires when heated causing one or several of the components within the L-jet system to perform eradically or not at all. If you have not replaced the harness with a new one from Kyle I would strongly reccomend doing so. They are not cheap but if your going to hold onto your Bus it’s money extremely well spent! Just a thought.

[THall]

[airkooledchris]

[Amskeptic]

[equinox]

Hey Colin

Yep, I'm down. I want my bus running....right. Everyone says you are the dude to do it.

Book me for the date and time indicated. I'll book 1/2 day off from work. We'll do it together!

Robb

[busdaddy]

[raygreenwood]

Love your service ethic Colin!

Ray

[equinox]

"I will need to ask a few questions before committing to the below: "

What are your questions?

[Amskeptic]

[equinox]

Any parts that may be good idea to order ahead of time??

[equinox]

Today's the day!

Looking forward to meeting Colin and figuring out what's up with the bus.

Bus in garage and garage all cleaned out yesterday. See you soon!

[THall]

[aerosurfer]

Good luck.... after all this time, not sure if I'm rooting for something major or minor to find
_________________
Rebuild your own FI Harness..My Harness

77 Westy 2.0L Rockin and Rolling Resto!

72 Sportsmobile (sold)
79 Tran$porter... Parts car money machine (gone)

[Amskeptic]

[Amskeptic]

[alman72]

POST! POST!

[SGKent]

DRUM ROLL...………………………………………….

and the winner is...………………..????????
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“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin