I don't hold pressure on the fuel rail for over 45 minutes. It's down to 10 psi after about half an hour. My car seems to run fine..Other than always feeling too slow but that's most likely in my head. Are there any disadvantages to not having it hold pressure over night like most people can? I had the o-rings replaced when I got the base ported. Thanks!

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• Red '88 IROC 305 TPI T-5 w/3.08
• Accel 300+ Ignition
• Accel 300+ Pro Sleeve Plug Wires
• AC Delco Rapid Fire Plugs
• Dual Friction Stage III Centerforce Clutch
• Energy Suspension Transmission Mount
• Flowmaster Force II 3 Chamber Cat Back Exhaust
• Gutted Airboxes
• Hypertech Stage II PROM
• Hypertech Airfoil
• Throttle Body Coolant Bypass
• Best Maryland (40 degrees) E/T 14.686, 60' 2.205, 1/8th mile 9.461, 1/4 mile MPH 93.91
• Best Florida (80 degrees) E/T 14.88, 60' 2.163, 1/8th mile 9.540, 1/4 mile MPH 92.74
• Best 60' 2.163(Florida)
• TPiS AFPR set to 42psi using Accel Fuel Pressure Gauge (Installed after Maryland run)
• Aluminum Driveshaft (Installed after Maryland run)

I am looking to buy Edelbrock T.E.S. headers with the y-pipe. I am also looking for a 3.42 - 3.55 posi disc rear. cheesy@fred.net is my e-mail, send a letter if you can help!

 

Fuel injectors leaking down, as they worsen, can cause the same effect as flooding on a carbed car. Mine would run well until I turned it off. Then on restart it would barely run.

Consider having them flow matched and balanced by Rich at <A HREF="http://www.cruzinperformance.com">Cruzin Performance</A>

...makes a lot of difference, almost like a mod. Also it could be your <A HREF="http://www.gmtips.com/3rd-degree/dox/parts/1.htm">fuel rail o-rings</A> themselves which would be about 20 bucks for the set.

 

the leak down isnt always injector related, it may be leaking back past the pump or the fuel press regulator. Mine has the same problem and I have all new injectors, and no puff of black smoke or anything like that if there were too much gas in the cylinders at start up, according to the GM repair manual you can pinch the hoses that lead into the fuel rail at the front to determine which is the case, I dont remember exactly which determines what but if you pinch both lines and it still leaks down then definately the injectors but if you do one or the other it means either pump or regulator. Ill have to dig it up unless someone knows for sure which it is.

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'87 Monte Carlo SS,with '89 IROC 350,700 trans, blew up 3.73 posi stuck with crappy 2.73's neeed gears! hooker headers, flowmaster 2 1/2" exhaust true dualls, recently installed a set of alum vette heads 58cc, new cam for a paxton, recently installed paxton, OMG need a posi bad. So if anyone knows where a buick GN 8.5" rear is let me know.

 

I guess it would depend where it's leaking down at. If it's just leaking back through the pump, then it's not a big deal performance wise. It just might take a little longer to start. Anywhere else though, I'd look into getting it fixed like the others stated...it can only get worse.

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1989 IROC-Z, ZZ3 shortblock with some bolt-ons.
13.20 @ 108.69, 2.2 60'