1981 Non-turbo Wont Start

[woldson]

I don't know about that Gollum. I'am not positive but fuel injectors atomize the fuel unlike carbs, so heat is not so much of an issure for cold starts.

[Gollum]

In "How to Tune and Modify Engine Management Systems" by Jeff Hartman he talks about this specifically, and yes, fuel injection systems still need a hot engine to atomize the fuel.

 

He even specifically talks about cold start fuel ratios, giving example figures, but I forget what they were. I think it was something like as low as 4:1 air fuel in order to get the engine started and running smooth.

 

Fuel injectors help the fuel atomize, but our pintile type injectors don't do that great of a job. The super modern bosch injectors that have really fine sprayers help the fuel atomize because it's spraying such fine particles, but they also tend to clog a lot easier requiring much cleaner fuel systems.

 

A fuel injector can't magically turn the fuel into vapors, it's still just a liquid pump of sorts. And it also can't work without pressure. Think of injectors as doorways controlled by a coil, that's it.

 

I highly recommend that book btw. Been one of my favorite reads and I'm still reading it over and over again.

[woldson]

Ahh crud, your right. Thanks for your input.

[HowlerMonkey]

Don't adjust jack ♥♥♥♥.

 

Check for the positive at the injectors when cranking.

 

If you have no positive, then the ecu bringing the ground won't do anything.

 

Many times when injectors are replaced, people will also replace the connectors..........with the key in the on position. Any touching of the positive feed wires to the engine will blow the fuse link or a fuse.

 

Also......pull a plug to see if it's wet.

 

If one has a bad connection to the head temp sensor, the car will go unbelievably rich to the point that you might not get it started and end up with wet plugs.

 

If they're platinum, they are less resistent to flooding than standard plugs.