fuel injector pulse signal

Asked by whichwrench1 Feb 24, 2010 at 12:21 PM about the 1991 Chevrolet Corvette Convertible RWD

Question type: Maintenance & Repair

got a '91 tuned port.had sat for 7 years.replaced the fuel pump and filter,ign.module and ecm.cranks and dies.fuel pressure and spark are fine but injector pulse fades away.checked all ecm power and grounds.sent to dealer,they are lost and just running up my bill.injector maintains 12vdc at all times key is on.tried a third ecm for gp but to no avail.what could cause the injector pulse to fade away?both sets do the same.will stay running when sprayed in the throttle body.im confused and have been doing this most my life!thanks for any input.

3 Answers

1mechanicspecialist answered 5 years ago

I have a 97 supercharged grand prix-- harmonic balancer was damaged which caused me no injector pulse. The back of the balancer blades got bent when I lost my serpentine belt. Changed everything-- crank sensor, can sensor ,modual , e.c.m , fuel pressure sensor , injectors. , injector Harness , fuel rail , ect! Still nothing!! If the fins on the back of balancer arnt within range of the crank sensor , you won't have injector pulse. Just saying!! Ya never know!

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