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Old 04-21-2022, 10:29 PM   #1
5025speed
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tbi issue

Why is my 1989 square body crew cab cold blooded? 454 auto 2 wheel drive
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Old 04-22-2022, 07:43 AM   #2
cadillac_al
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Re: tbi issue

It probably has old spark plugs and wires and a check engine light on.
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Old 04-23-2022, 04:54 AM   #3
kwmech
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Re: tbi issue

Cold blooded TBI is going to run rich. Check the T-stat, should be a 195.
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Old 04-24-2022, 01:31 AM   #4
LT7A
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Re: tbi issue

Maybe check your temperature sending unit. I believe there're two. On a different, more computerized vehicle, I've had it nearly not start because it couldn't cope with not having that information. Sometimes the computer doesn't guess well. Also, if you don't have a three wire oxygen sensor you might want to switch to that. Especially if you have headers. It takes a little while for the sensor to get warm enough to read correctly. And sometimes headers never get warm enough, depending where the bung is placed. The three wire will warm up the sensor electrically and give you good readings right off the bat. Good luck man, I hope you get it figured out! Let us know.
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Old 04-27-2022, 07:29 PM   #5
chris989
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Re: tbi issue

But a OB11 to usb cable and then download WinALDL free software. You will be able to read and flag data and data log. It will take the guessing out of if it is TBI related.

https://winaldl.joby.se/

https://www.amazon.com/ScanTool-OBDL..._t1_B07SR1H4FC
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Old 04-28-2022, 04:29 AM   #6
LT7A
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Re: tbi issue

Quote:
Originally Posted by chris989 View Post
But a OB11 to usb cable and then download WinALDL free software. You will be able to read and flag data and data log. It will take the guessing out of if it is TBI related.

https://winaldl.joby.se/

https://www.amazon.com/ScanTool-OBDL..._t1_B07SR1H4FC
Correct me if I'm wrong, but that kind of looks to me like OBD2 paraphernalia. And 1989 ain't gonna be that. I'd love to be wrong, because if you got something that helps me tap-in better to my 1993, I'm all ears!
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Old 04-28-2022, 12:46 PM   #7
chris989
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Re: tbi issue

Quote:
Originally Posted by LT7A View Post
Correct me if I'm wrong, but that kind of looks to me like OBD2 paraphernalia. And 1989 ain't gonna be that. I'd love to be wrong, because if you got something that helps me tap-in better to my 1993, I'm all ears!
Sorry,,, I think i sent you a wrong link, It is OBD1,,,, I have an 89 suburban also, My cable came from Moates (i think) and I can not find it on their website.

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Old 05-06-2022, 08:01 AM   #8
LT7A
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Re: tbi issue

Quote:
Originally Posted by chris989 View Post
Sorry,,, I think i sent you a wrong link, It is OBD1,,,, I have an 89 suburban also, My cable came from Moates (i think) and I can not find it on their website.

Chris
Oh, shoot. Could you put up a picture of your cable with relevant names/numbers if you have a chance? If really like to get in on that.
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Old 05-06-2022, 10:27 AM   #9
chris989
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Re: tbi issue

I think i have this one,
http://aldlcable.com/products/aldlobd1u.asp


check this page out,.
http://aldlcable.com/


I do not remember paying so much for it but it was over ten years ago.
chris
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Old 05-09-2022, 10:56 AM   #10
LT7A
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Re: tbi issue

Thanks! That's great info. You've used the software from the link above?
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Old 05-11-2022, 10:57 AM   #11
MARKDTN
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Re: tbi issue

For less than $300 you can buy a used Snap-On MT2500 Scanner good to at least late 90s that does great for this kind of thing. Just another option.
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Old 05-12-2022, 06:42 PM   #12
LT7A
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Re: tbi issue

5025speed, I hope you don't mind that we've added a little sidetrack in here about getting codes and data from the OBD1 engines.

MARKDTN, thanks for the idea on the snap-on scanner. I've been thinking that I need to pick one of those up, but it does appeal to me to get some visibility into what's going on with the engine. It seems like it's also possible to find out what conditions precipitated the code if I get the cable and hook it up to a laptop. I'll admit I'm intrigued by that.
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Old 05-12-2022, 06:58 PM   #13
cadillac_al
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Re: tbi issue

No love for the lowly free paper clip?
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Old 05-14-2022, 09:56 AM   #14
LT7A
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Re: tbi issue

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Originally Posted by cadillac_al View Post
No love for the lowly free paper clip?
Haha, a little affection in a pinch, anyway.
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Old 05-19-2022, 08:06 AM   #15
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Re: tbi issue

Great info!
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