1987 Chevy Astro cranks, won't run

1987 CHEVROLET ASTRO
90,000 MILES • 4 CYL • 2WD • AUTOMATIC
Avatar
JJBJL
  • MEMBER
  • 3 POSTS
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.
Jun 9, 2009 at 10:52 AM
Advertisement
Avatar
BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
Check for injector pulse
check TPS sensor and its volts
good luck
let me know
Jun 9, 2009 at 11:28 AM
Avatar
JJBJL
  • MEMBER
  • 3 POSTS
replaced TPS with new, no help. How do you check for pulsing in the injector?
Jun 10, 2009 at 1:05 AM
Avatar
BMRFIXIT
  • ✓Experienced 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


https://images.2carpros.com/forum/automotive_pictures/99387_8_21_2007_13_3_11_3.jpg

Jun 10, 2009 at 10:16 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle