Need a little 88 tbi help !! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71see10 · 01-28-2008, 08:01 AM

I just installed a new motor in my 88 k1500, I just had to put my intake on and oil pan. The problem I am having is very rough idle when I first start and until Its warms!! (Acts like its flooding)Going down the road I have no problems. Then when I stop at a red light and have to wait over 10 or 15 sec
It go back to rough idleing until I move or put it in nuetral and give it a little gas, and it will smooth out. I have cheched for vacuum leaks and have fought nothing. Its like (when its warm) at idle if it has a pull on the engine at all it goes crazy!! What would be some suggestion I should do or check. Thanks in advance. Brian

ChevyTech · 01-28-2008, 08:26 AM

Have you checked to see if the ECM has stored any trouble codes?

It sounds like it could be a coolant temp sensor issue. The ECM uses the coolant temp sensor by the T-stat to determine how much fuel to inject.

Do you have an ohm meter to test the sensor if I give you specifications?

chrisk1500 · 01-28-2008, 08:37 AM

Check fuel psi as well...

**Boog** · 01-28-2008, 01:06 PM

I am fairly sure you will need to replace the coolant temp sensor located next to the thermostat housing to fix it. This is classic symptons of a bad one. I have seen one so bad it would not pull itself over a flat driveway until it warmed up.

71see10 · 01-29-2008, 12:00 AM

Thanks guys,I'll check on all of these thing and get back soon!!

01-28-2008, 08:01 AM	#1
71see10 Worthless Join Date: Jun 2006 Location: LaFayette, GA Posts: 199	Need a little 88 tbi help !! I just installed a new motor in my 88 k1500, I just had to put my intake on and oil pan. The problem I am having is very rough idle when I first start and until Its warms!! (Acts like its flooding)Going down the road I have no problems. Then when I stop at a red light and have to wait over 10 or 15 sec It go back to rough idleing until I move or put it in nuetral and give it a little gas, and it will smooth out. I have cheched for vacuum leaks and have fought nothing. Its like (when its warm) at idle if it has a pull on the engine at all it goes crazy!! What would be some suggestion I should do or check. Thanks in advance. Brian

01-28-2008, 08:26 AM	#2
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: Need a little 88 tbi help !! Have you checked to see if the ECM has stored any trouble codes? It sounds like it could be a coolant temp sensor issue. The ECM uses the coolant temp sensor by the T-stat to determine how much fuel to inject. Do you have an ohm meter to test the sensor if I give you specifications?

01-28-2008, 08:37 AM	#3
chrisk1500 Registered User Join Date: Jan 2007 Location: Saskatchewan Posts: 105	Re: Need a little 88 tbi help !! Check fuel psi as well... __________________ 95 Silverado 1500, 6.5 TD (S), 3.73, 4L80-E, EGR blocked, ISSPRO boost and EGT gauges, #9 resistor, PMD behind bumper, 6' PMD extension harness, 18 psi max boost, gutted plenum, air intake, ATA IC, Heath GL4 chip, Heath HO injectors, 3/8" IP supply line, 4" exhaust, -1.94 TDCO, ARP head studs, Heath HO lift pump, HO waterpump, Rancho RS5000 shocks 1/4 Mile ET 16.7 @ 80 MPH 2006 Jetta TDI

01-28-2008, 01:06 PM	#4
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 14,116	Re: Need a little 88 tbi help !! I am fairly sure you will need to replace the coolant temp sensor located next to the thermostat housing to fix it. This is classic symptons of a bad one. I have seen one so bad it would not pull itself over a flat driveway until it warmed up. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver 'primer is finer' Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

01-29-2008, 12:00 AM	#5
71see10 Worthless Join Date: Jun 2006 Location: LaFayette, GA Posts: 199	Re: Need a little 88 tbi help !! Thanks guys,I'll check on all of these thing and get back soon!!



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