Injector Pulse Question

[Mack4194]

I have no injector pulse while cranking. I have replaced my distributor which is under lifetime warranty. This did not solve my problem.

 

My question to you experienced gentlemen is what makes the injectors pulse while cranking?

 

Any help is appreciated. Thanks Guys

Mack

[jimoshel]

What year? Which engine?

[Geonovast]

A bad CPS will also cause no injector pulse. Do you have spark?

[Mack4194]

Sorry bout that,

 

It's an 89 4.0 manual trans. I have spark. It will run after I spray propane in the intake to start it. But it doesn't run well when I give it much gas. I have to baby the throttle otherwise it bogs out.

[HOrnbrod]

How did you test and determine you had no injector pulse while cranking? Noid Light? Have you checked your fuel pressure with a gauge yet?

[Mack4194]

Sorry it's been a little while. Yes, checked with a noid light to determine no pulse. Fuel pressure was checked with a gauge to eliminate that possibility. CPS you say? I replaced it in January, but my truck did sit in the river for about 20 mins...... :( Think that could've broke it?

[Geonovast]

If you have spark, your CPS is good. (Well, good enough to turn on the injectors anyway.) I would check to make sure that all the ground wires going from the injectors are good and grounded properly.

[Mack4194]

I'm going to replace the Computer. Hopefully that works :)

[Geonovast]

Certainly a distinct possibility at this point.

[Mack4194]

Darnit, computer didn't fix it. There goes 110 bucks. Checked all wires for connection/grounding. No problems there that I was able to find.