72 rs

all right guys i need some help here. my 87 chevy pick-up is having a hard time starting after it runs for a while. the problem is that its not wanting to put any fuel through the injectors. when you turn it over it just dosent putout enough fuel to start the motor, but after it starts it runs fine......................HELP.

old dawg

Might try disconnecting the engine coolant temp sensor up by the thermostat housing. That should simulate a cold engine and give a richer mixture. It may be going south when the engine warms up. Does it start ok cold?

ellets

I have a different brand with same prob. My quick fix was to add a resitance decade box in line with sensor. This way I can change the duration of injector open time. cheap and dirty fix.

72 rs

it seems to do the same when cold..just not as bad. the sensor is new

old dawg

Ellets, that sounds like a good idea. I might try that to play around with the mixture a bit. Mine seems to be running too lean to get decent acceleration.

homefree

all you have to do is put a varistor in stead of a decade box. Just take the volume control off from a old radio.BINGO.

72 rs

im about to do some very extensive tbi tuning. ive been reading some info on cfm-tech.com and im about to start tuneing my tbi unit. im going to put a ajustable fuel presure regutator in along wit a in line fuel presure gauge. im going to at some point add a a ported tbi unit and some flow mached injectors, along with a injector spacer. a really good mod is to replace your 1 wire o2 sensor with a 3 wire, it seems to work alot better