'88 5.7 TBI .. the TPS ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mountie · 02-07-2018, 01:18 PM

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)

**Mr_Rich** · 02-07-2018, 01:50 PM

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.

arrg · 02-07-2018, 06:06 PM

Not slotted on my 88.

mountie · 02-07-2018, 06:43 PM

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) ???????

arrg · 02-10-2018, 06:38 PM

The only number on the side of it is C1664. It's super old though. It might even be original.

mountie · 02-10-2018, 07:20 PM

Thanks.... that will help for a cross reference.

arrg · 02-10-2018, 11:39 PM

The TPS111DG part number on autozone.com looks to be slotted/adjustable.

Warrens69GMC · 02-10-2018, 11:46 PM

found the same one as above poster

mountie · 02-11-2018, 11:32 AM

Quote:

Originally Posted by Warrens69GMC

found the same one as above poster

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.

02-07-2018, 01:18 PM	#1
mountie Registered User Join Date: Jun 2011 Location: Bradenton, Fla. Posts: 1,100	'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) __________________ '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
Mr_Rich Registered User Join Date: May 2006 Location: Santa Maria, Calif. Posts: 781	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. __________________ 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
arrg Registered User Join Date: Feb 2016 Location: Omaha, NE Posts: 38	Re: '88 5.7 TBI .. the TPS ??? Not slotted on my 88. Attached Images

02-07-2018, 06:43 PM	#4
mountie Registered User Join Date: Jun 2011 Location: Bradenton, Fla. Posts: 1,100	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) ??????? __________________ '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
arrg Registered User Join Date: Feb 2016 Location: Omaha, NE Posts: 38	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. __________________ 1988 Chevrolet C1500 RCSB

02-10-2018, 07:20 PM	#6
mountie Registered User Join Date: Jun 2011 Location: Bradenton, Fla. Posts: 1,100	Re: '88 5.7 TBI .. the TPS ??? Thanks.... that will help for a cross reference. __________________ '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
arrg Registered User Join Date: Feb 2016 Location: Omaha, NE Posts: 38	Re: '88 5.7 TBI .. the TPS ??? The TPS111DG part number on autozone.com looks to be slotted/adjustable. __________________ 1988 Chevrolet C1500 RCSB

02-10-2018, 11:46 PM	#8
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,613	Re: '88 5.7 TBI .. the TPS ??? found the same one as above poster



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.