Does an 87 chevy suburban have a chip (not an ecm) for the tbi? And if so where is it located?

After checking this out, i found that this truck has a throttle position sensor. Not sure if there is a timing mark at all. I believe it is set by the ECM (computer) via the TPS

for a swap like that a chilton book would cover info for both motors and they cost under 20 bucks. just saying it beats the hell out of guessing at it or taking some schmucks advise from the internet. since your old 5.7 had TBI im hoping the 454 your swapping it with is also a TBI, if not your best bet would probally be to convert to carb but your going to need to replace the fuel system as the 2 high pressure lines that ran the TBI wont work with a carb. if it is TBI your going to need the ECM that came with the 454 as the 350 one is just going to "get confused" and have issues. Since your rig has an older ECM you can remove the Electronic senders and replace them with manual ones to simplify everything ( i have an 89 chevy i built a rat 355 for so ive been through this before) . without knowing exactly the year of the 454 thats about all i can think of to watch out for on that swap, i hope your not trying to mate the 454 to a 4L60, your going to need at least a 4l80 with an upgraded sun shell gear or a heavy duty manual ( at least 10 spline and 12 inch clutch).

bad harness connection
faulty pump relay
faulty pressure reulator
blocked filter
no signal from ECM to relay

Kent, That sounds like normal operation.....see this link (https://www.justanswer.com/chevy/0z9bu-fuel-pump-relay-located-1987-chevy-silverado.html) The ECM shuts the pump down if the engine doesn't begin running in two seconds. I would bleed out the fuel line up to the TBI...crack the line at the TBI then cycle the key a couple of times until you see gas coming out of the line at the TBI. That will ensure you have fuel at the TBI, then try to start the engine. See the link for additional info.

the computers located on passenger side. look under the glove box to right at floorboard. see the panel to the right? remove that panel,you will see the ecm or computer. most people would say,setting in passeger side seat,look where my right foots at on the floorboard.just to the right,that panel needs to come off. you will see the computer when you remove that cover. 'note' the replacement computer numbers have to match,exactly,or else it will not work. ask any parts dealer[autozone,advance auto] suggest you do research before you replace it if you have'nt. and if you have,good luck and thank you for choosing fixya.com we look forward to assisting you in the future!

Remove the radio and make sure he did not cut any wires to the ECM engine control (module).The wires run along the back of the radio to behind the glove box to the ECM.If this is all good then check the connections.If all is good then you could have a bad ECM.Tyr the scan tool on another vehicle to make sure the scan tool is working properly.Hope this helps.Good luck.

Sits inside the throttle body, you would have to open to install regulator. Also check your fuel filter make sure it's not clog, fuel filter is under truck on fram rail, while your there do a fuel pressure test, with a fuel pressure tester, should have 13psi.

Sounds like the knock sensor has failed. It's on the passenger side at the bottom of the engine block, in front of the starter. One wire going to it. Have you checked the timing lately, maybe it has moved?

check vacume pressure at carb. diaphram had sim. prob. with 78 caprice

Powertrain Control Module = under right side of dash, near blower motor.
Engine Control Module = same as above
Vehicle Control Module = same as above

All Suburban vehicles are equipped with only one of these choices. Good luck.