2.9 engine miss?

[Spitfire1975]

The rail pressure dropped another 5 lbs in the last half hour. I know it will go to 0 lbs, because that's where it was when I started this. No rail pressure at all. Jumped the Fuel pump and built it up to 36. Now at 14.

 

[Bronco_Chuck]

i wouldnt worry about it if all your cylinders are at 150 ish.

 

[Spitfire1975]

other than not being able to keep it running at idle.

 

[Spitfire1975]

any way to test injectors? I have another set in the garage.

 

[Spitfire1975]

and the compression is the last time I checked. Gonna check again to see if it has changed.

 

[Bronco_Chuck]

they should have an ohm spec. but that would only show if the winding has shorted.

 

[Spitfire1975]

and bad resistance would result in....? (sorry, I am not familiar with the inner workings of an injector)

 

[Spitfire1975]

Had one here measuring 15.8 ohms

 

[Bronco_Chuck]

well an injector is just a silonoid. an electro magnet that when powered up pushes or pulls a small metal rod. if it was shorted it may not open the injector completly, and if open will not open the injector at all. have you checked for vacume leaks?

 

[Spitfire1975]

So far I haven't been able to find any. I replaced the lower intake manifold gasket not all that long ago. One thing I didn't mention a few posts age is that if I remove the vacuum line behind the throttle body (red one, on top) the idle increases and smooths out.

 

[Spitfire1975]

If take off the green one from the EGR Vacuum control and apply vacuum to it the engine dies like it should.

 

[Spitfire1975]

And I have something buzzing by the air filter box. Thought it was the starter solenoid. Then I thought it was the new EGR vacuum Control, Now I am thinking it is one of the Relays. Has been hard to pinpoint.

 

[Spitfire1975]

By the way, Thank you for your help.

 

[Bronco_Chuck]

its probably a relay. my 86 had a relay that would buzz for a few seconds after i turned it off. never gave me any trouble. check for a vacum leak. my 86 had a crack in the line that goes to the brake booster and it had an erratic idle.

 

[Bronco_Chuck]

no problem i just wish i could help more.