Mike '91 Z28

Could this be the problem? On a cold start my engine seems to blurp when I give it gas. It eventually goes away after it's been idling for about 2-3mins. Also, after the car is powered off, when I restart it and right when I put it in to gear 75% of the time it stalls or is just about too. Anyone have any ideas on what can be causing this?

Thanks.

DANIELEK

You can ohm each injector to rule this out. They all have to be very close within each other in range.

I will be doing that soon. It is too cold right now.

Vader

Mike,

Before you get all excited about the injectors, you should check fuel pressure. After that, make sure the IAC and throttle body are both whistle-clean. I'd suspect more of an air control problem than injectors. I had injectors that were bad, to the point of being low on flow (up to 38% low on one) and the car always started and ran well when cold.

Incidentally, the operating coil resistance check will only tell you about the electrical condition of the injectors, not about the flow. And the resistance isn't that critical. The factory designed coil resistance is 16.2 ohms per coil, but the allowable operating range is from 12-18 ohms. The batch fire circuit is only seeing and switching the total resistance of the circuit, not individual injectors as in an SFI system. Overall batch injector circuit resistance can be as low as 3 ohms and still operate normally.