1987 Chevy Astro cranks, won't run

JJBJL

MEMBER
1987 CHEVROLET ASTRO
4 CYL
2WD
AUTOMATIC
90,000 MILES

Engine turns over w/starter, won't run unless gas is added (slowly) to throttle body/air intake, then it runs reasonably well as long as gas is added by slowly pouring it in. (Plugs firing normally, timing seems ok.) Have replaced injector, computer (twice), distributor. Fuel pressure is good (13psi) at throttle body inlet. Replaced old gasoline in tank with fresh. Injector does not seem to be allowing gas in. Am desperate for ideas. Any help appreciated.

Tuesday, June 9th, 2009 AT 5:52 PM

3 Replies

BMRFIXIT

MECHANIC
19,053 POSTS

Check for injector pulse
check TPS sensor and its volts
good luck
let me know

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Tuesday, June 9th, 2009 AT 6:28 PM

JJBJL

MEMBER
3 POSTS

Replaced TPS with new, no help. How do you check for pulsing in the injector?

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Wednesday, June 10th, 2009 AT 8:05 AM

BMRFIXIT

MECHANIC
19,053 POSTS

You need a noid light or you can use a test light
turn ignition ON test disconnect the injectors and test for battery power at RED and WHITE wires
you should have battery power if not check fuses and wiring harness
if power OK
need to check if the ECM pulsing the injectors
place the one side of the test light at a battery positive side and ask a helper to crank the engine for you as you checking if the test light blinking when on LT. GRN or BLUE wires

let me know