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02-07-2018, 01:18 PM | #1 |
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Join Date: Jun 2011
Location: Bradenton, Fla.
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'88 5.7 TBI .. the TPS ???
Ok, I'm getting confused.
It started when I bought a nice rebuilt TBI 5 years ago. I don't remember if my old TBI had an adjustable TPS on it. The rebuilt has a TPS w/ slotted bolt holes. After chasing some stalling issues, I decided to find out if the TPS was bad. The parts houses only show a non-adjustable TPS. But an AC Delco TPS, ( as shown in the "book", and also at the GMC dealer show a non-adjustable TPS. The problem is the adjustable TPS allows my truck to run better.. after adjusting it. ( but I don't know if it is failing?) Take a look at your '88 5.7, and let me know if your TPS has slotted bolt holes or not??? ( You should be able to see by looking)
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'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
02-07-2018, 01:50 PM | #2 |
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Location: Santa Maria, Calif.
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Re: '88 5.7 TBI .. the TPS ???
I think it's the later years the TPS was made non-adjustable but you can slot the holes for adjustment. Small files and a Dremel rotary tool are some of the most useful tools I own. I really couldn't tell if mine is adj. by looking at it since it's kind of buried but I remember I have adjusted it long ago.
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1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C |
02-07-2018, 06:06 PM | #3 |
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Location: Omaha, NE
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Re: '88 5.7 TBI .. the TPS ???
Not slotted on my 88.
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02-07-2018, 06:43 PM | #4 |
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Re: '88 5.7 TBI .. the TPS ???
Thanks.... I wonder if you can make out a number on It? It should be on the side, that is exposed ( wipe off the dust).... maybe you can still see it ? Apparently, the new one ( AC Delco) I got is bad. ( & a week and a half for a replacement) ???????
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'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) Last edited by mountie; 02-07-2018 at 07:10 PM. |
02-10-2018, 06:38 PM | #5 |
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Re: '88 5.7 TBI .. the TPS ???
The only number on the side of it is C1664. It's super old though. It might even be original.
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1988 Chevrolet C1500 RCSB |
02-10-2018, 07:20 PM | #6 |
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Location: Bradenton, Fla.
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Re: '88 5.7 TBI .. the TPS ???
Thanks.... that will help for a cross reference.
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'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
02-10-2018, 11:39 PM | #7 |
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Location: Omaha, NE
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Re: '88 5.7 TBI .. the TPS ???
The TPS111DG part number on autozone.com looks to be slotted/adjustable.
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1988 Chevrolet C1500 RCSB |
02-10-2018, 11:46 PM | #8 |
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Location: Safford,AZ
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Re: '88 5.7 TBI .. the TPS ???
found the same one as above poster
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02-11-2018, 11:32 AM | #9 |
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Join Date: Jun 2011
Location: Bradenton, Fla.
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Re: '88 5.7 TBI .. the TPS ???
I will check out that TPS at the store... In photo, they show the front side view only. No photo showing the other side of it. I found some to have the 'arm' on the opposite side, and it turns the other way.
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'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
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