Asked by Mar 29, 2016 at 10:39 PM about the 1989 Chevrolet C/K 1500 Silverado Standard Cab LB

Question type: Maintenance & Repair

Here is my dilemma, I built a 350/4 bolt main with all eagle bottom end
components, vortec heads w/2.02/1.60 valves, 58cc, 1.6 roller rockers,
summit cam 288/298 duration, 446/466 lift, edelbrock performer tbi intake
w/  stock reman TBI, new distibutor w/msd coil, ss headers, lunati timing
components. The problem is, running rich, now it does as soon as i take
foot on gas. Here the following I have done: new fuel pump and filter, new
o2 sensor, new temp sensor, tbi came with new map/tps, new ecm,
checked all grounds, no vac leaks, new plugs and wires now, only thing i
don't have connected is the factory oil pressure gauge, i installed a
mechanical one. no one seems to have an answer, i have  a brand new
motor, is it to much for the ecm. I just bought a new vortec carb intake to
go that route, but don't want to if i can solve this problem.this truck was
built for my 16 year old son who is now bummed out and losing hope in it
running. please help.

1 Answer


Yes it is too much, the valve overlap alone would send it to wacko land trying to set everything to work. To make this stock setup work you will need to reprogram the computer to match all of the changes you have made to the engine. I don't know of any place that is doing that sort of thing to stock systems. I have seen a TBI Holley setup that ran really sweet, he did say he had a bit of a problem finding the sweet spot but the interface was really accurate, he had changed out the distributor for a full centrifugal advance unit, hotter coil and wires, and of course done away with all of the stock computer controls. With what you have now it might be eaiser to setup the carb system and change out the distributor to either vacuum advance or centrifugal. And don't forget to damper down the fuel pressure, even TBI pressures will lift the needle right off the seat in the carb. HTH

Your Answer

Add photo

Related Questions

  • Hard start 11 answers

    Here lately every time I cut my truck off I have to pour fuel down the tbi to get it to restarted, after it starts it kinda ok, sometimes it stalls every time I put it in geAr an hit the gas, most...

    1998 Chevrolet C/K 1500 Cheyenne Extended Cab LB


    Maintenance & Repair

  • TBI injectors dribbling fuel within the spray pattern 18 answers

    I have new .060, 4 bolt main block, eagle crank & rods, new vortec heads w/ 2.02/1.60 valves 58cc, .500 lift springs & 1.6 Harlan Sharp roller rockers, lunati bare bones timing chain/gear, summit ca...

    1989 Chevrolet C/K 1500 Silverado Standard Cab LB


    Maintenance & Repair

  • 1994 Chevy C1500 5.7 bogs/backfires when I give it gas. 34 answers

    My truck bogs down (and tries to die) when I give it gas to accelerate off of a stop. There is often a backfire or two when this happens. Pumping the gas does not help. I basically have to crawl thr...

    1994 Chevrolet C/K 1500 Silverado Standard Cab Stepside SB 4WD


    Maintenance & Repair

  • Whats doing it 4 answers

    My 1993 chevy truck v6 aint acting right i did timing everything i can think of i half to start pumping gas pedal like crazy to crank it and keep pumping to keep it running as soon as i stop pumping...

    1991 Chevrolet C/K 1500 Silverado Standard Cab LB


    Maintenance & Repair

  • Gas Mileage 36 answers

    I have a 95 Chevy ext. Cab right now. Is there anything that I could possibly do to increase the gas mileage on my 5.7 liter gas Engine??? Cold Air Intake? New Air Filter? New Spark Plugs or any hoses...

    1995 Chevrolet C/K 1500


    Car Customization

Search Chevrolet C/K 1500 Questions

Chevrolet C/K 1500 Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 2,640
#2 John Saffrahn
John Saffrahn
Reputation 2,260
#3 Rowefast
Reputation 1,190
View All

Related Models For Sale

Used GMC Sierra 1500"
1,024 Great Deals out of 56,926 listings starting at $2,300
Used Ford F-150"
3,267 Great Deals out of 216,697 listings starting at $1,500
Used Chevrolet C/K 2500"
287 listings starting at $1,995
Used Chevrolet S-10"
13 Great Deals out of 1,811 listings starting at $1,749
Used Chevrolet C/K 3500"
299 listings starting at $5,995
Used Chevrolet Camaro"
798 Great Deals out of 38,822 listings starting at $2,650