Go Back   Chevrolet Forum - Chevy Enthusiasts Forums > Current Chevy Trucks, SUV's, Crossovers & Vans > Silverado & Fullsize Pick-ups
Sign in using an external account
Register Forgot Password?

Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900
Sponsored by: Bakliner

LinkBack Thread Tools
Old 08-03-2010, 01:16 PM
CF Beginner
Join Date: Aug 2010
Posts: 2
Angry 1988 454 tbi not running like a 454

Its a 88 k3500 4x4 with the 454 tbi and when i bought it it sat for two years.I have replaced the fuel pump, distributor, coil, cap, rotor, plugs wires.pretty much everything for a basic tune up and since i got it it seems like its gradually running worse and worse ive messed with timing numerous times hoping thats all it was but ive tried every position it seems like its not firing right and its running rich.it sounds like it idles a little high and it has good power when you first take off but as soon as you gas it it falls flat on its face and doesnt accellerate.I have ran out of ideas somebody told me it could be my knock sensor but i cant even find one on my motor and the guy at advance said it doesnt have one so idk.somebody please help me!
Register today for free or log-in if already registered to remove this ad!
Reply With Quote
Old 08-03-2010, 01:50 PM
CF Beginner
Join Date: Jul 2010
Posts: 5

I have seen similiar problems with TBI and it ended up being the throttle position sensor being faulty, it was causing a high idle, running rich and just poor driveability

this should be located on the right hand side of the throttle body, when looking at the motor from the front of the truck
Reply With Quote
Old 08-03-2010, 05:49 PM
CF Beginner
Join Date: Aug 2010
Posts: 2

thanks, do you know a way to test if the tps is bad?
Reply With Quote
Old 08-05-2010, 10:42 AM
CF Beginner
Join Date: Aug 2010
Posts: 9
Default 88 tbi

Give this a try:

Reply With Quote
Old 08-05-2010, 03:48 PM
2wd-K5's Avatar
CF Pro Member
1979 Chevrolet Blazer
Join Date: Jul 2010
Location: salmon arm BC
Posts: 846

my dad had the same problem and he took it off and cleaned it with carb cleaner and it worked properly after, worth a shot
1979 2wd k5 blazer- parked and will have engine pulled and original put back in and sold
coming soon: rebirth of an 81 malibu coupe
fast - cheap - reliable: pick 2
Reply With Quote
Old 08-12-2010, 06:53 PM
CF Beginner
Join Date: Jul 2010
Posts: 14

Check the plug wires to make sure they're plugged in the right order.
Reply With Quote
Old 10-31-2012, 08:43 PM
CF Beginner
Join Date: Oct 2012
Posts: 1

look for vacuum leak around base of throttle body,just spray some carb clean around it while it is running and listen for changes in rpms
Reply With Quote
Old 10-31-2012, 08:43 PM

2000, 454, 88, bad, cap, chevy, distributor, forums, gas, k3500, knocking, position, problems, readiness, run, running, sensor, test, throttle

Thread Tools

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Join Chevroletforum
Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 12:58 PM.

Internet Brands, Inc.

Emails Backup