The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-05-2011, 06:10 PM   #1
Rumble
Registered User
 
Join Date: Oct 2010
Location: temecula, ca
Posts: 29
1987 TBI wontstay running, i did tune up and fuel filter already !!

my truck is actually an 89 crew , so its square body, it ran decent when i bought it, not great, i finally got around to doing a tune up and still ran crappy, just did fuel filter, still wont stay running, it will start.

If i tap the gas constantly it will run rough, but no pedal and and steady pedal and it will die

I noticed a greeen wire on the passenger side of block near exhaust manifold, the tip was broken and dry rotted, looks like it connects to a sensor there, any idea what it is???????

thanx
Rumble is offline   Reply With Quote
Old 04-05-2011, 06:26 PM   #2
bloodybronco
Registered User
 
Join Date: Mar 2011
Location: Quebec, Qc
Posts: 9
Re: 1987 TBI wontstay running, i did tune up and fuel filter already !!

I have an 88 tbi wiring diagram, doesn't tell me where wires are but if you look at it i just copied the part with green wires on it
could be idle air control wires, tps, or map
hope this helps
Attached Images
 
bloodybronco is offline   Reply With Quote
Old 04-05-2011, 06:37 PM   #3
87 V20 Scottsdale
Registered User
 
87 V20 Scottsdale's Avatar
 
Join Date: Jul 2010
Location: Georgetown, KY
Posts: 183
Re: 1987 TBI wontstay running, i did tune up and fuel filter already !!

Have you tried to see if it is throwing any trouble codes?
__________________
Andrew

1987 V20 Scottsdale 383 TBI, SM465, NP208, 14FF, 4.10
1988 C1500 Scottsdale 305, 700R4, 3.08
1986 K30 Custom Deluxe 6.2, SM465, NP205, 14FF, 4.10

Last edited by 87 V20 Scottsdale; 04-05-2011 at 06:38 PM.
87 V20 Scottsdale is offline   Reply With Quote
Old 04-05-2011, 06:41 PM   #4
Rumble
Registered User
 
Join Date: Oct 2010
Location: temecula, ca
Posts: 29
Re: 1987 TBI wontstay running, i did tune up and fuel filter already !!

no check engine light for the seconds that its running, a friend told me the green wire was coolant temp, he said connect or it would run rediculously rich,
i connected it but still runs like crap, i have to keep pumping the pedal to keep it idling
if there is no check engine light are there any trouble codes? how would i check them, my truck is too old for OBD 2 i think
Rumble is offline   Reply With Quote
Old 04-05-2011, 06:45 PM   #5
jchav62
1962 C-10
 
jchav62's Avatar
 
Join Date: Apr 2005
Location: Las Vegas, New Mexico
Posts: 4,978
Re: 1987 TBI wontstay running, i did tune up and fuel filter already !!

It's my understanding that TBI's need the coolant temp sensor to run right. I'm not sure if it's the green wire or not. I'd try repairing that connection and see if it helps.
__________________
Joseph Chavez
"See the USA in a Chevrolet!!"
......................_____
.........________//__{\_____
,,,,,,,/__(O)___//___/__(O)_/

1962 C10 Shortbed Fleetside 327/th350 GV overdrive
1974 C10 Longbed Fleetside 350/th350 "The Trash Truck"
1999 Chevy 2500 OBS, Longbed 5.7/4L80E 4x4
2015 GMC Sierra SLE 1500 4x4

Last edited by jchav62; 04-05-2011 at 06:45 PM.
jchav62 is offline   Reply With Quote
Old 04-05-2011, 07:20 PM   #6
Rumble
Registered User
 
Join Date: Oct 2010
Location: temecula, ca
Posts: 29
Re: 1987 TBI wontstay running, i did tune up and fuel filter already !!

i connected that wire
Rumble is offline   Reply With Quote
Old 04-06-2011, 12:14 AM   #7
Rumble
Registered User
 
Join Date: Oct 2010
Location: temecula, ca
Posts: 29
Re: 1987 TBI wontstay running, i did tune up and fuel filter already !!

a mechanic friend of mine told me it was probably the distributor, he said very common problem,
i pulled a spark plug and had someone turn the motor over several times, it was dark out and i could barely see the spark, so we figured the distributor was dying
also it make a wierd noise most of the time i try to start it like an electric drill
Rumble is offline   Reply With Quote
Old 04-06-2011, 01:18 PM   #8
Hulk Will Smash
Registered User
 
Hulk Will Smash's Avatar
 
Join Date: Apr 2006
Location: Huntington Beach, CA
Posts: 492
Re: 1987 TBI wontstay running, i did tune up and fuel filter already !!

The TBI motors also have an oil pressure sensor that shuts the motor down or puts it in limp mode, I think, when it detects low pressure. Hang in there man! These trucks are super cool. You'll love the convenience of the TBI once you get it dialed in.
__________________
'87 R30 Crew Cab Dually

It's 11 PM, do you know where your IAC pintle is?
Hulk Will Smash is offline   Reply With Quote
Old 04-06-2011, 09:36 PM   #9
pig rig
Registered User
 
pig rig's Avatar
 
Join Date: Feb 2009
Location: washington the state
Posts: 730
Re: 1987 TBI wontstay running, i did tune up and fuel filter already !!

the coolent temp wire is at the thermostat just below it the green wire I'm thinking is to the oil pressure gauge
your truck is OBD1 OBD1 was ued up untill 96 then cam OB2

you can check for codes with a paper clip I suggest you get a chilltons or a hynes manual its got lots of info about the way OBD1 works and it also will tell you what the codes mean
once you get your truck running right you'll realy like it and once you start to understand what each sensor does and how it works you can get more power and milage out of your motor
__________________
my sports car rolls on six wheels only because I'm to fat to get in and out of new corvette


http://hubgarage.s3.amazonaws.com/ph...ped_detail.JPG
pig rig is offline   Reply With Quote
Old 04-06-2011, 09:39 PM   #10
pig rig
Registered User
 
pig rig's Avatar
 
Join Date: Feb 2009
Location: washington the state
Posts: 730
Re: 1987 TBI wontstay running, i did tune up and fuel filter already !!

just got thinking more about that green wire its the coolent temp switch for the auxiliary fan thats in front of your rad.
__________________
my sports car rolls on six wheels only because I'm to fat to get in and out of new corvette


http://hubgarage.s3.amazonaws.com/ph...ped_detail.JPG
pig rig is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 06:43 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com