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Serious problems...car will barely run

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Old Oct 11, 2005 | 09:44 PM
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Default Serious problems...car will barely run

This problem just started about a week ago, it was running fine before that. It's a 99 WS6 w/ H/C and about everything else. The car will start and idle ok, but when I try to give it any throttle it just hits a "wall" and runs horribly or dies. The more throttle I give it the worse it is. I really don't know where to check, I replaced the fuel filter because it needed it anyway and thought it'd be an easy fix if that was it. could it be a fueling issue?? It has a walbro 255LPh in tank pump with about 10,000 mi on it. could it be something inside the motor? Any help on where I can start to diagnose this would be great, thanks.
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Old Oct 11, 2005 | 09:59 PM
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sound like a fuel problem still. did you replace the sump screen with the pump? could be a tps sensor or something
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Old Oct 11, 2005 | 11:40 PM
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Need to hook up a fuel pressure gauge and see what your pressure is. Minimum you need around 45-55 psi.
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Old Oct 12, 2005 | 07:04 AM
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Also, check the EGR valve and emissions stuff. I would bet on that because it's just when you give it gas.
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Old Oct 12, 2005 | 07:13 AM
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No emissions stuff on the car, longtubes with ORY and no EGR. I'll try the fuel pressure guage, thanks guys
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Old Oct 12, 2005 | 12:25 PM
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if you beated the **** ot the cams for a while (constantly) may be the valvesprings have overheated and lost its temper, and with minimum rpm rise the valve floats
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Old Oct 12, 2005 | 12:39 PM
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when u floor it does it go away and get up and go? i had the SAME problem as you and it was the o2 sensor.
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Old Oct 12, 2005 | 08:16 PM
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well I checked the fuel pressure just now, it was 20 psi at idle and would pretty much hold there or a little under. the car won't rev at all just won't run past idle. Sound like the fuel pump?? any other ideas? Thanks
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Old Oct 12, 2005 | 08:25 PM
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Originally Posted by RedTransAm
well I checked the fuel pressure just now, it was 20 psi at idle and would pretty much hold there or a little under. the car won't rev at all just won't run past idle. Sound like the fuel pump?? any other ideas? Thanks
Like I said you need a MINIMUM of 45 lbs, time for a fuel pump....and change the filter or you will fry the new one.........
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Old Oct 14, 2005 | 12:39 PM
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maybe you run the car with very little fuel-no fuel in the tank and fried the pump, I did that with a brand new camaro 98` with actual 660Km total. (I did run our of gas)
SCREAMED AND KICKED everything in the dealer, threatened for a legal refund.... got fixed inmediatelly even they worked untill midnight!!!!!! ;-)



buy TWO fuel pumps, put them in a "T" run them in paralel this is because the OEM fuel pump is marginal at high rpms
this idea is from one of "the books"
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