My TBI 1991 305 does not fire when cranking. Until the battery starts going dead. Which is then turning over at a slow revaluation. But it's still yellow (no fire). Is it my pick up coil? Or timing?

Asked by Feb 28, 2015 at 07:06 AM about the 1991 Chevrolet C/K 1500

Question type: Maintenance & Repair

Swap ECM/PCM COMPUTER.
Sense I'm going to a 305. From a
350. Or just wire a knock sensor into
the original ECM.

2 Answers

33,415

If you have your original 350 ECM, you will have to get a compatible ECM for your 305.

Same ecms a 305 will run off a 350 ecms and vise versa. First off while cranking is the injectors spraying fuel. If not then pull the cap off the distributor and remove the little sensor that's held with 2 bolts. Then get a new one problem solved

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