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1990 Sedan Deville, 2000 Chevy Tahoe
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Discussion Starter #1
I have a 1990 Deville with a throttle body that may need to be rebuilt. It does not close on its own. The unit is clean and is getting removed to see if the blades or shaft is sticking. My mechanic said you can send these out to be rebuilt, is that true? and is it worth it to fix it properly. Can I get one at a junk yard and try my chances. ISC is going to be replaced but he does not think that will solve the problem completely. I read this site often and feel good about my mechanic and doing good work. My question is are there resources out there on rebuilding these units if need be. I live in the NW part of the country. I plan on keeping the car for a while. The price to rebuild them is $400 + and he said Gm does not make new ones.
 

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GMParts Direct lists a "throttle body service kit". Might be worth an email to learn what it contains and if the contents are relative to your situation.
FWIW
YMMV
DFB
 

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1990 Sedan Deville, 2000 Chevy Tahoe
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29 Posts
Discussion Starter #4
My mechanic checked it out and it does not have a problem disconnected from the car. No problems closing so he is in the porcess of putting things back together. Could the cruise control cable be to tight, this connects under the shaft and holds the throttle open. I have also noticed the two cables on top are NOT snug but have some play in them. Any other thoughts on why the idle does not settle down? I have not drove it with the new parts. Thanks for the gm direct link I will check it out.
 

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1990 Sedan Deville, 2000 Chevy Tahoe
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29 Posts
Discussion Starter #6
OK so my idle is fixed and here is what they did to fix it. Adjusted the cruise control cables and throttle cables to allow the throttle to move all the way back down to the closed position. The one part they replaced helped lower the idle but the cable adjustment was what fixed the problem for good ( I hope). So this trip to the shop cost $675.00. Ouch, but 3 vacume leaks were found, serpentine belt was replaced along with 2 new pully's. The ISC part was replaced, throttle body was taken off and new gasket and cable adustments made. He also fixed the Air Bag and ashtray. Prior to this work I had the oil cooler replaced due to a stripped fitting that was causing an oil leak. $91.50 for the repair and an hour of labor to take out the radiatior.

Next is a new starter and recharge the A/C next spring. The car also need new shocks and struts...Then She will be ready for 17" rims and WIDE white walls!!!
 

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2008 SRX-V8, 1991 Eldorado
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1,543 Posts
Due to the advent of Internet access, there is almost no such thing as obsolete anymore. Things just get tougher to find as (I) they get older....*LOL
 

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1990 Sedan Deville, 2000 Chevy Tahoe
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29 Posts
Discussion Starter #8
I was just in H-town and Big this weekend for work. I used to live in Spring and almost forgot how much freeway miles one can drive down there. Any Caddy is great in Texas ... the bigger the better. I drove my car today and the idle is fixed and the motor runs fine now. Question though, when viewing the fuel miles per gallon should the mpg go up to 60-70 when coasting down a slight grade at 55mph? I could only get 42 today and this makes me wonder if the car is set right for the best mileage. What do Ya'll think?
 

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1992 Town Car Cartier & 2014 Accord LX MTX
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34,087 Posts
Ummm wasnt the '90 4.5 Port Fuel Injected?
 
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