Stutter while going into boost

[eclipsetuner_21]

My car seems to stutter when I rev it. When my boost gauge hits zero and the car will try to climb but stutters and holds back. It cuts fuel pressure. The engine seems to stall like it almost dies but when I let off it idles just fine. Anything Ideas???

 

[tkelly27]

use the search function. You most likely have a boost leak somewhere, and you've got to find it.

How do you know it cuts fuel pressure?

 

[eclipsetuner_21]

I have installed a walboro 255 high pressure and -6an lines feed and return to a aremotive afpr. I have swapped maf's, cas, and throttle position sensor with a friend with no luck. I have checked my eprom ecu and it is perfect. I have a datalogger and the reading look good. I did change the spark plugs to standard ngk's and it ran good for like 10 minutes and then fell back into the same symptom. I have also unbolted the downpipe to check for a clogged cat or muffler.

 

[Quasimondo]

Have you checked your base timing? You're not doing something crazy like running the blow-off valve open to the atmosphere, right? What condition are your plug wires?

 

[Evil_speedracer]

I was going to ask about base timing as well. Mine acted like that when my intake cam went a tooth off from taking a rag off the valve cover into the gears. One tooth was enough to get an idle, but then it would hold back as soon as the boost comes on. It was like the ECU pulled a crazy amount of timing out. I wonder about the wires, and the plugs. What kind are you running, and what condition are they if you pull them right now?

 

[tkelly27]

did you do a boost leak test yet? It doesn't have to idle poorly to have a boost leak. Sometimes there can be splits in pipes that seal shut under vacuum but split open as soon as there's positive outward pressure.

The other thing I've had problems with is the coil pack plug. On occasion as soon as I start making any power the plug will wiggle loose and the car will die.

 

[subie22]

Check for boost leaks. Most likely the cause. My car does the same exact thing. Just dont have the boost tester to fix it. Let me know if any one local has got one for me to use ...

 

[EclipseSH21]

Sounds like a misfire. Check your plugs. Get some NGK wires.