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Old 07-27-2016, 05:34 PM   #1
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Tbi

If you have a query, PM me and I might be able to help.


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Old 07-27-2016, 06:25 PM   #2
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I love a good mystery.
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Old 07-27-2016, 06:27 PM   #3
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Old 07-27-2016, 06:47 PM   #4
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Tbi

Mystery solved? Perhaps a reply meant for this thread?


http://www.airforums.com/forums/f311...ml#post1771248


Not sure how your wires got crossed there - but as a separate thread - you had us all guessing on what you were going for there, Boom Sounds! 😀

Hope this helps close the loop!
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Old 07-27-2016, 07:01 PM   #5
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Originally Posted by SteveSueMac View Post
Mystery solved? Perhaps a reply meant for this thread?


http://www.airforums.com/forums/f311...ml#post1771248


Not sure how your wires got crossed there - but as a separate thread - you had us all guessing on what you were going for there, Boom Sounds! 😀

Hope this helps close the loop!
Close! Maybe a smaller explanation; Brad and I have been trying to help Nick in preparation for his summer vacation to Italy in his 250.....

Without adding details, there is nothing like a component failure when you are in a time crunch, to focus the mind and Nick has learnt more about 454 TBI in the last few days than he really wanted ever to know, hence the initial message offering help to anyone in the same boat.
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Old 07-27-2016, 07:04 PM   #6
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I should have added....in this case 'help' means, Brad providing experience and knowledge and me running around autoparts stores whilst driving to the airport to fly to UK - I officially know 'nothing' about TBI but was a willing 'go-for'!
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Old 07-27-2016, 07:13 PM   #7
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Tbi

As long as it all works out. 😀

I had to edit my reply as first time through it said something about having your wives crossed (instead of wires) 😳

And on edit here - I don't even know how to spell TBI 😀

Hope all's well with you, Martin!
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Old 07-28-2016, 12:18 AM   #8
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Maximum respect to Martin and Brad Kahler. I shall purchase some beer when our paths finally cross.


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Old 07-28-2016, 12:34 AM   #9
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Step 1 find your casting number
Step 2 cross reference ac Delco and Rockauto sites with your vin number and look under fuel injection
Step 3 identify the bewildering number of AC Delco throttle bodies which appear to fit your van at wildly different prices
Step 4 call Ac Delco and any number of Chevy parts houses, none of whom can give you a straight answer. Realise that none of them are made anymore so you are looking for dead stock
Step 5 ponder the imperceptible differences between the throttle bodies and how they tie back to engine codes, your trans and your RPO numbers
Step 6 write to Brad Kahler and wait for response
Step 7 have a cold beer and take your pick, maybe they all work and the fact they vary between $200 and $1000 bucks isn't actually relevant
Step 8 laugh at the fact that AC Delco told you their online system with VIN lookup isn't always correct and they use another system which ties into the GM parts database. That shattered my previous understanding
Step 9 realise you have nine days until your vacation and the part is on the other side of the world
Step 10 just make your mind up and order it. There, I said it.
Step 11 remind anyone considering a throttle body rebuild not to shear the head off the throttle body

Seriously, know your VIN, get your RPO print out, there's nothing quite like a stock casting number, cross reference sites. TBI should be straightforward, but the throttle bodies and vary. You must have the flange connector iac on the 454. Ninja fuel systems do a great rebuild gasket set. Cody the car guy and fuel injection sucks have some good YouTube videos on the rebuild process.




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Old 07-28-2016, 05:45 PM   #10
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We're zooming in on the facts.....

'Nick, we don't have that particular part number of throttle body on hand. We do have several 454 throttle bodies that would fit a '91 truck, but some of the van and motorhome throttle bodies have different throttle linkage so the cable can mount from the front, so I'm not sure if any of them would work for you.'


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Old 07-29-2016, 03:13 PM   #11
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Managed to get the throttle body down to a local machine shop - they fixed it good as new.

Btw - if you need a new throttle body, check out

SPR PERFORMANCE
1111 W Morton Ave Ste 2
Jacksonville, IL 62650

Or

Greg Spence

Carburetor Specialist

5715 N Commerce Ct., Suite 200

Alpharetta, GA 30004-4178

They are good people


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Old 07-29-2016, 03:26 PM   #12
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Managed to get the throttle body down to a local machine shop - they fixed it good as new.

Btw - if you need a new throttle body, check out

SPR PERFORMANCE
1111 W Morton Ave Ste 2
Jacksonville, IL 62650

Or

Greg Spence

Carburetor Specialist

5715 N Commerce Ct., Suite 200

Alpharetta, GA 30004-4178

They are good people


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Great news Nick....what is the current betting on making the holiday trip next week? If you are coming through Dover you will be pretty close to our place in the UK!
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Old 07-29-2016, 03:38 PM   #13
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Nick, glad to hear a machine shop was able to remove the broken screw! I'd love to know what technique they used to perform the extraction.

Hopefully this means you'll be able to make your Italy trip happen.

Brad
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Old 07-31-2016, 11:57 PM   #14
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Have dropped you both an email, have made good progress, but the underlying problem remains. I have a few things still to try out (timing, grounds, vacuum hoses and EGR valve), but the clock is ticking.
Theoretically, we leave at the weekend. If that happens, it will probably be Sunday. Martin - are you about? We'll be getting the tunnel so heading M25/Folkestone.
Wish me luck!

PS. Turns out that the 454/7.4 L TBI Motorhome throttle bodies were slightly different insomuch as vacuum port and linkages were slightly different layouts. I think some of the others can be made to work though.


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