Should the fuel pressure be perfectly steady when idling, not changine RPM's, or would the way the injectors fire cause the pressure to flucuate a little?

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

http://www.geocities.com/david_angel_16

 

Mine fluctuates, +/- 2 lbs or so at idle. Don't know if that's regular, but it runs fine like that, so I think it's just part of the batch fire system.

-Reno

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89 Formula 350
"This is how you remind me of what I really am..." - Nickelback

 

Breath, mine's perfectly steady at idle and increases at WOT, but still steady.

Maybe the fuel pump isn't providing enough flow to keep up?

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

I have the same thing,it bounces +/-4 lb's very quickly,

 

well i went out, and i was gonna unplug each injector to see if one was screwing up, well hooked up the guage, and it was steady .. and a couple weeks ago it was jumping around, so i have no clue what was or is wrong.

------------------
- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

http://www.geocities.com/david_angel_16

 

possible weak injector windings..
meaning an injector may open, but can not
remain open do to the weakness in the windings.
i just pitched one that was doing the same.
plus one not even opening. clicked and pressure
was there, just wouldnt spray.
replaced the injectors and problems went
away...
airdeano