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Old 02-02-2016, 07:58 AM   #127
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Necessity is the mother of invention!

Any idea what those pistons do?
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Old 02-02-2016, 03:14 PM   #128
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Quote:
Originally Posted by Boom Sounds View Post
My 1991 250 classic has a stock TBI with 4l80E. Happy to share any info if you need any, just PM me. allbest Nick
Nick, pictures of the engine and transmission from various angles top and bottom would be very helpful
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Old 02-02-2016, 07:01 PM   #129
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Quote:
Originally Posted by bkahler View Post
Necessity is the mother of invention!

Any idea what those pistons do?
I called them pistons for a lack of a better word. They are fuel transfer tube connectors and are stationary.
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Old 02-03-2016, 07:27 PM   #130
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Damn Brad, you are a bad influence as Steve suggested. Now after I fixed the leak at the throttle body per your suggestion, I don't get any more gasoline fumes to keep me going. What you gonna do about that???
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Old 02-04-2016, 06:44 AM   #131
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Quote:
Originally Posted by PeterH-Airstreamer View Post
Damn Brad, you are a bad influence as Steve suggested. Now after I fixed the leak at the throttle body per your suggestion, I don't get any more gasoline fumes to keep me going. What you gonna do about that???
I'm not a bad influence, I'm just an enabler of course that could be said for just about everyone on Airforums

I'm sure you'll be able to find some other source of fumes to keep you going as a leak is bound to show up somewhere when you least expect it...
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Old 02-09-2016, 12:13 PM   #132
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I've been trying to find a place top post this as a "warning to 454 TBI owners" so here goes!
(disclaimer..I'm not a mechanic but won't admit it and am in denial!)
My 350LE is equipped with the 454 TBI which, given the 16.000lb weight, the significantly under-powered 454 and full thickness Corian counter tops, had managed to pull the Classic up the odd hill in first gear while slip-streaming the semi in front!

Recently, after staring the engine (fine), I stopped at the end of my driveway to close the gate. and turned-off the engine. Some 10 minutes later, after steadying my nerves (for those who have not driven one of these 35 foot long behemoths on the road, this is a necessary yoga-like move) and clambering over the "dog-house" into the driver's seat etc., the engine turned -over but would not fire. So this is the sequence of "trouble-shooting" which I hope will save other AS owners with a similar symptom considerable time and a reduced alcohol consumption!
1. was getting fuel (too much it seems)
2. was getting spark but sort of weak
3. changed-out distributor cap, rotor, coil and ignition control module..no improvement
4. replaced MAP sensor, oxygen sensor...no improvement but sort of started..rough idle
5. replaced fuel regulator and temperature sensor...ran smoothly when cold but as warmed, ran rough.
6. as I had already replaced the EGR valve and cracked base some time ago, did not think that this was the problem until I inadvertently fell on the EGR vacuum hose which came to pieces in my hand as I "saved" myself from straddling the engine bay!
7. replaced the EGR vacuum hose and problem solved!
I had borrowed a vintage OB-1 reader but could not get a connection or code which may have saved me the 1000 hours eliminating the fault!
Now, if only I could be as successful with the other "to do list" items!
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Old 02-09-2016, 12:27 PM   #133
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Good info Chris.
I too have never been able to get a "OBD1" code reader to work on my '87 suburban, and ended up always using a paperclip in the ALDI connector to flash the CEL.
You just put a paperclip or piece of wire in the two pins on the top right side of the 12 pin connector under the dash and it flashes the code... say, 2 flashes, the a 2 sec delay, then 4 flashes will be Code 24, etc.
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Old 02-09-2016, 02:45 PM   #134
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Snr. Keyair..good to know next time I experience a "hack attack" on the 350. Assuming I can get a code, where is the information that might allow me to decipher the code?
chris
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Old 02-09-2016, 03:05 PM   #135
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I made a spelling error... its called the ALDL, or Assembly Line Data Link.

Tricky to answer, but here should give you a start...
http://www.troublecodes.net/gm/
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Old 02-09-2016, 07:10 PM   #136
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Any clues as to why the OBD-1 readers don't seem to be connecting to the ECM/PCMs properly?

I know the PCM I'll be using is considerably faster than the earlier versions so maybe that has something to do with it. Of course I'm a long ways from being able to test that theory!

Brad
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Old 02-24-2016, 12:53 PM   #137
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Steve, just an update on TBI vs carburetor heights.

The 2" throttle body with the Spectre carb hat that I am planning on sits 5-9/16" tall from the where it sits on the Edlebrock Performer intake manifold to the top of the carb hat. The wing nut is 1/4" tall so Overall height of the TBI unit is 5-13/16". However I still need to account for the TB adapter plate which will I will likely make out of 3/4" aluminum plate so the overall height will actually be 6-9/16" to the top of the carb hat wing nut.

The Edelbrock 1406 carburetor and carb hat sits 7-1/4" tall from the surface of the manifold.

Keep in mind the TBI numbers don't include that cooling donut which I don't plan on using. This means the TBI will sit 11/16" lower than the carburetor I was planning on using.

One of point of interest. It appears the 1994 stock TBI intake manifold has a carburetor pad height that is almost identical to the pad height of the Edelbrock intake so you likely won't gain any room by switching to the OEM TBI intake manifold. I know you're planning using the OEM manifold more for emissions that anything else but don't count on gaining any head room when doing so.

I suppose that's my good news for the day
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Old 02-27-2016, 10:02 PM   #138
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Paint the Edelbrock engine color and I bet the emission inspector will never notice it...


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Old 02-28-2016, 05:46 AM   #139
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The Edelbrock manifold actually has a CARB EO number, so it is smog legal!
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Old 03-31-2016, 01:16 AM   #140
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Brad - the van is coming out of winter storage this weekend so let me know if you still need any info/pictures on the TBI set up.

Nick


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