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 1988 - 1998 Chevy & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 05-31-2018, 11:50 PM   #1
Raptor0206
Registered User
 
Join Date: Jun 2015
Location: Las Vegas, NV
Posts: 63
Calling all TBI masters!!!! HELP

Whos the TBI master on here? This damn k5 I bought is giving me the blues! 1987 k5 with a 350 all stock. When I bought it it had been sitting for a long time. Prior owner swore it ran but couldn't get it to start. Anyways I bought it replaced the batter and battery cables. No fuel to the injectors so checked power at pump and found the pump to be bad. Threw in a new complete sender and fuel filter and it fired up....had a constant pop out the exhaust here and there. But ran. Got it warm and shut it off and it wouldn't restart. Acted like a dead battery or overheated starter. Next day started fine but hand a stumble. I wrote it off as bad gas. Ordered a new tank and installed that a few weeks later the old gas turned my new sender into a rusty mess but still worked. Still had a miss after that found the injectors to be dripping. Installed new injectors and fuel pressure regulater. Now ran much better but still had same issue. Then I did a tune up new plugs, wires, cap and rotor. No change. Figured it's running rich with some black smoke after you get on it. Replaced the map sensor helped a lot still got the heat soak. Last step I adjusted the timing back to 0 (brown wire unhooked) hooked it back up and runs like crap. With my timing light it was at about 30-32 degrees timing before. I noticed when I first started with the timing light I had a strong constant flash but at the end it was intermediate. Now the truck runs like crap. What would you guys go with next? New ecu? New spark control? New distrubtor? Coil? New o2? (O2 does look new) New egr? also I checked for vacuum leaks and replaced some of the lines along with the plastic lines.
Raptor0206 is offline   Reply With Quote
Old 06-01-2018, 07:15 AM   #2
Katrina/10
Registered User
 
Katrina/10's Avatar
 
Join Date: Oct 2010
Location: Ocean Springs, MS
Posts: 1,563
Re: Calling all TBI masters!!!! HELP

Got a check engine light?
__________________
Gary

1971 Chevrolet C/10
1951 GMC 100
1977 GMC C15
1955 Chevrolet 3100
Katrina/10 is offline   Reply With Quote
Old 06-01-2018, 09:22 AM   #3
Raptor0206
Registered User
 
Join Date: Jun 2015
Location: Las Vegas, NV
Posts: 63
Re: Calling all TBI masters!!!! HELP

Quote:
Originally Posted by Katrina/10 View Post
Got a check engine light?
None. But unsure if the light is burnt out.
Raptor0206 is offline   Reply With Quote
Old 06-01-2018, 09:57 AM   #4
sntrym95
Registered User
 
sntrym95's Avatar
 
Join Date: Jan 2006
Location: Cleveland, Oh
Posts: 576
Re: Calling all TBI masters!!!! HELP

Check the ignition coil and the distributor module. Both are prone to failure when hot.
__________________
Mike

Toy list:
1995 C1500 Ext. Cab 5.7
1995 GMC Yukon 4dr 2wd 5.7 Vortec conversion, AAM TracRite, Lincoln Mark VIII fan conversion
1979 Mako 23 CC
sntrym95 is offline   Reply With Quote
Old 06-01-2018, 10:29 AM   #5
jnickell41
Registered User
 
Join Date: Aug 2015
Location: Farmington Hills
Posts: 14
Re: Calling all TBI masters!!!! HELP

I went through a similar issue on my '87 R10. In the end it ended up being a rusted egr valve. Would idle well but as soon as you pulled vacuum on the valve and release, the valve would hang up and run like crap.
jnickell41 is offline   Reply With Quote
Old 06-01-2018, 12:52 PM   #6
Mr_Rich
Registered User
 
Mr_Rich's Avatar
 
Join Date: May 2006
Location: Santa Maria, Calif.
Posts: 498
Re: Calling all TBI masters!!!! HELP

Quote:
Originally Posted by Raptor0206 View Post
None. But unsure if the light is burnt out.
That's the first thing I thought of. The check engine light should illuminate as soon as you turn the key to ON. It goes out after the engine starts in normal conditions. With the waterfall of problems you describe you need that diagnostic capability working. You'll have to pull out the gauge cluster assembly and once you do that remove the gas gauge module to replace the 194 bulb in the top center position of that particular module.
I have a Diacom diagnostic setup for OBD1 testing. I'm not aware of any other OBD1 testers and that might be what you need. So much of this stuff is obsolete that makes testing that much more difficult. Try to fix that light. It sounds like you're capable to do that. Just use a light touch since so much of that plastic is old and brittle.
__________________
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.
1997 K2500 Chev. EC 7.4L/ 4L80E
Mr_Rich is offline   Reply With Quote
Old 06-01-2018, 12:53 PM   #7
Katrina/10
Registered User
 
Katrina/10's Avatar
 
Join Date: Oct 2010
Location: Ocean Springs, MS
Posts: 1,563
Re: Calling all TBI masters!!!! HELP

The engine lamp should be on with key on, engine off. If not, try changing the bulb. It would be good to see if there are any codes in the ecm.
__________________
Gary

1971 Chevrolet C/10
1951 GMC 100
1977 GMC C15
1955 Chevrolet 3100
Katrina/10 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 10:36 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com