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Throttle body cast number question

R

Robert D

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Well, it looks like I must of cross-threaded the fuel delivery line fitting into the throttle body as it is leaking pretty badly. If I need to source another throttle body, would a part from any Blazer/Jimmy from 88-93 work or do I need to look for the specific casting number?

I will pull the part to confirm, but http://www.greenleafauto.com lists 17091042 as the throttle body casting number for my truck. This number appears to be the casting number for 91-93 GM 350 TBIs. Does anybody know what changes between these? I've seen throttle bodies on Ebay for pretty cheap, but none of them match the part number for my truck.

Another option, though undesirable would be to epoxy/JB Weld the fitting into the throttle body...or i could possibly time-sert it.

I'll plan on pulling the throttle body and checking the part number on it and actual damage to the threads to be sure, but do you guys have any experience/thoughts on this?

Cheers!

Truck is a 1991 GMC Jimmy TBI 350, all stock and 151k miles on the clock.
 
So, I've removed the TB and the casting number is indeed #17091042. I also managed to break the end of the detent cable (the lower linkage cable end), which I imagine isn't too hard to replace aside from getting to the other end of it...I might just limp it over to a shop to do that for me. The detent cable is just for downshifting when you floor the accelerator, correct?

Back to the throttle body, I'd like to get a used replacement on order. It looks like the promising solution is to find one from a '91-'93. From pictures I've seen on ebay, mine is different from some others in the type of injector and/or the vacuum fittings (it looks like some of the pictures have 4 vacuum fittings on the front of the TB and mine has 3).

Any thoughts anybody? The existing throttle body could be re-threaded I guess...but the fitting is also pretty messed up...JB Weld, um-huh :D.
 
Im assuming you have a 700r4 tranny and that cable is the TV cable. Dont drive without it hooked up and adjusted correctly or you will be buying a new tranny
 
BTW, something that restored a bit of faith in myself...I did not remember it being terribly difficult to bolt the old fitting into the TB, and I really was doubting the fact that the amount of torque I applied could of done it....so upon inspection of the TB, the threads were absolutely awful and I'm beginning to wonder if the mechanic who changed the fuel line the first time around might have a little to contribute to the misthreading.

This brings up another point. I've now gone through two fuel delivery lines in 3 years with a leak in the braided portion of the hose, near the transmission. This time around I replaced it myself, and tried to zip-tie it away from where it can rub...have any of you had trouble with these fuel lines? I picked up a spare to store in the toolbox in the back of the truck just in case it happens again...
 
Well, bad news. I can't get the truck together without a new set of the brass fittings on the fuel lines. These are the fittings which bolt into the TBI and receive the fuel lines...these are also the pieces which stripped the threads on the old TBI. Anybody know where to find these?
 
Wow, where did this post come from? I never saw it. Sounds like you are making progress.

If you are having problems with the lines, I suspect you may be missing some clamps that hold them steady and away from edges that they could rub on. The problems you mention are why I don't let other people work on my truck. :)

Someone has got to have some of those fittings lying around from a bad throttle body somewhere. Post up in parts wanted is all I can think of, if someone doesn't respond here.

You could always call your local GM parts counter, get the part number/price from them, and then check that part number on gmpartsdirect.com. Shipping may be ridiculous, or it might not be, have to have a part number to know though. GMPD can actually looks parts up for you as well if you email them, although hard to describe if they don't know exactly what you are talking about.

Many counter parts people anymore aren't any better than some mechanics out there, and will simply say it's not available, but unless they give you the part number, they are lying and don't want to, or don't know how to look it up. I would bet those are separate parts that at least at one time, could be purchased singly from the dealer.
 
Good call, I'll see what I can dig up.

I made the mistake of trying to use the old fittings....I'll be ordering another injector pod as well. Sigh...
 
On the lines, I forgot to mention, someone needs to let you know how they are routed stock, so you can get any other parts that may now be missing. GM did not play around with the fuel systems on these trucks. It may be that the hard lines were situated up and away from the metal with no clamps, but I doubt GM did that, as it would lead to vibration even if there was no abrasion, and that's bad for fittings. Everywhere else (power steering, brakes, etc) there were rubber/metal lines, there were clamps to the frame or body.

I would check for you, but my parts manuals are packed up. :(
 
I used some heater hose and slid it over the braided lines, I don't remember if it was 5/8 or 3/4. It doesn't look pretty but you can't really see it in there. One of mine was almost wore thru.
Tarey
 
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