87 V10 Custom Deluxe TBI Issues

[gnuiver]

Good morning,

My Wife bought me and 1987 Custom Deluxe V10, 350, with a nice plow for the Property up north. 92,000 miles. Been sitting for 14 years. Cleaned off the motor. removed the rusty Plugs and changed them. (no easy task) Smog pump and pipes have dissolved so I removed them, put a 25k resistor in place. New fuel tank, filter and pump. Cleaned the tbi and flushed the fuel lines. Cap and wires which turned into a distributer when both screws broke off for the cap. Exhaust is missing yet where it rusted through in front of the Cat. Battery in Cranks over no start but will run only if I bottle feed it. No signal to the injectors. 12.3 volts on the positive side, injectors open if i manually ground them. New ground strap on the back of the motor. Suggestions? Tried to externally ground the ECM no joy.

 

[dd1990]

ecm could be rusty, I would clean contacts, look for any cut cable under dash

 

[gmbellew]

I'd start here and see where it takes you. the manuals are in the Reference Library.

 

[YakkoWarner]

Good morning,

My Wife bought me and 1987 Custom Deluxe V10, 350, with a nice plow for the Property up north. 92,000 miles. Been sitting for 14 years. Cleaned off the motor. removed the rusty Plugs and changed them. (no easy task) Smog pump and pipes have dissolved so I removed them, put a 25k resistor in place. New fuel tank, filter and pump. Cleaned the tbi and flushed the fuel lines. Cap and wires which turned into a distributer when both screws broke off for the cap. Exhaust is missing yet where it rusted through in front of the Cat. Battery in Cranks over no start but will run only if I bottle feed it. No signal to the injectors. 12.3 volts on the positive side, injectors open if i manually ground them. New ground strap on the back of the motor. Suggestions? Tried to externally ground the ECM no joy.

Can you provide a little more detail about replacing the smog pump and pipes with a 25K resistor? I'm not familiar with this but it could become relevant to me later (my truck still has all the AIR injection but it could be contributory to my lean fuel error so that might need to change).

 

[gnuiver]

Can you provide a little more detail about replacing the smog pump and pipes with a 25K resistor? I'm not familiar with this but it could become relevant to me later (my truck still has all the AIR injection but it could be contributory to my lean fuel error so that might need to change).

I got the resistor sizing on Chevytalk.org for deleting the smog pump. I'm told it makes the ECM think it is still operating.

 

[gnuiver]

I'd start here and see where it takes you. the manuals are in the Reference Library.

Forgive my ignorance I'm new. Can you direct me to the library

 

[gmbellew]

The SquareBody Reference Library

Part #s, RPO Codes, TSB's, Cast #'s, etc

www.gmsquarebody.com

 

[gnuiver]

ecm could be rusty, I would clean contacts, look for any cut cable under dash

No corrosion on the contacts in the ecm opened it up no burning or corrosion inside either. Wires have no evidence of Fivel the mouse either. Checked the grounds under the hood. Changed the ground strap from the fire wall to the block on the passenger side. Still no fuel. Going to get a reman ecm and try that.

 

[gnuiver]

Couple months have past verified 18 PSI fuel pressure. ECM change with no effect, new engine block ground strap to fire wall, cleaned the ground wire to the alternator mounting bolt. checked the grounds to the core support and cleaned them up, now my lights work properly. Still have 12 volts to my injectors when cranking, oil pressure comes to 30 psi cranking on the gauge. Distributer was changed when I tried to put in a new ignition module. Engine still runs when bottle fed. ?????

 

[fast 99]

Should be a visible pulse of fuel when cranking. 12v present at injectors? check for ground pulse on other side. Follow the diagnostic chart to the letter. Will take you to the offending issue. Broken exhaust, missing air pump no effect on starting. However, it will affect drivability after going into closed loop.