The cold start injector sprays fuel into the intake manifold to richen the fuel mixture on start-up. Ii is a small valve, nothing the size of the actual injectors. I am not sure if it only adds fuel on initial start-up, or until the engine is at operating speeds. Looking from the front of the truck at the engine, find the EFI on the intake manifold, the cold start injector is to the right of the"I". It has an electrical connector and a small fuel line attached to it. I don't know how often they go bad, or if they are rebuildable/cleanable, but i would imagine they can get clocked, or not fully close off after years of use.

I would think that the exhaust leak would be more of an issue at idle, since the volume of exhaust would be less, it would allow for fresh air to be drawn into the system.


Is the starter turning, or just clicking? If takes a few turns of the key/holding it open for a few seconds, it is likely the starter. I had the same issue with my '91, changed the contacts problem solved.

However if the starter/engine is turning over, it could be a poor fuel/air delivery, even timing. W/the EB cam, is there a different timing setting, or do you use the stock timing? What is the timing before and after jumping the terminal?


If you can get just sniffer test for free, or can come back a few times to the shop you paid for the the last test w/o being charged, I would replace the exhaust gasket at the manifold/down pipe, and take it back. If still "No Pass", look into the cold start injector, and the timing.

If you are allowed/smog tech is willing to, have him adjust the idle and retest. If your idle is set at oem specs, it may need to be bumped up a little due to the cam. I know w/my mod'd 3.0, the HC's are higher at 8-850 then they are 1050rpm's.