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| Fuel pump and throttle body problems (Page 1/1) |
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jaredaltizer
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JUN 08, 11:30 PM
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Hello PFFers.
Recently, I have taken on the task of swapping my stock 2.8 V6 out for a lower-mileage one, because I threw a rod in my original motor. This has been my first and (hopefully) only engine swap. After finally getting the engine and cradle back into the car with most of the vacuum lines and wiring harness hooked up, I have run into a couple problems.
My first problem is what I think is the fuel pump. The new engine will crank and turn over, but usually dies within a second or two. My buddy then told me to try starting the car again while he sprayed brake cleaner onto the throttle body, which seemed to work. He was able to keep it running as long as he sprayed the brake cleaner. I am assuming that this means I have a fuel-related issue. I can hear the fuel pump prime when I turn the key in the ignition, but I assume that it just won't stay pumping. Are there any suggestions on where to start looking for a fix? (Without the obvious answer of "buy a new fuel pump", as it was working with the old engine.)
My second problem is the throttle cable and attaching it to the throttle body. I cannot remember how the throttle cable (and cruise control cable) connect to the throttle body. Would anyone be able to help me out and post some pictures?
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Patrick
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JUN 09, 12:46 AM
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Don't make guesses... check the fuel pressure!
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Dennis LaGrua
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JUN 10, 09:34 AM
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| quote | Originally posted by Patrick:
Don't make guesses... check the fuel pressure! |
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Exactly. You can't solve problems in the blind! Place a gauge on the schrader fitting on the fuel rail and see what it reads. Somewhere in the neighborhood of 38-43 lbs at idle is where it should read. NO pressure = defective fuel pump. Low fuel pressure = bad FP regulator.------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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randy86
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JUN 12, 01:14 PM
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| quote | Originally posted by Dennis LaGrua:
Exactly. You can't solve problems in the blind! Place a gauge on the schrader fitting on the fuel rail and see what it reads. Somewhere in the neighborhood of 38-43 lbs at idle is where it should read. NO pressure = defective fuel pump. Low fuel pressure = bad FP regulator.
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No pressure could also be bad injectors, because one or more is stuck open.
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jaredaltizer
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JUN 12, 01:17 PM
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| quote | Originally posted by randy86:
No pressure could also be bad injectors, because one or more is stuck open. |
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I changed out the injectors yesterday, and they were my problem. 4 out of the 6 of the injectors had the caps broken off.
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