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Idahome
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93 ranger with 97 OHV and 5 speed? what wiring, metal or plastic intakes, etc
I love 93, very good year for the 4.0 no EGR, no Cam synchro and y better power dist box then the 90-92 trucks
Using the 97 computer, full obd2 conversion?
A fuel rail pressure test is needed, watch it closely when the "noise" or detonation occurs. I ike to see 36-42 psi on the return style rail, if it drops to 32 or 28 when you blurp the throttle (during detonation) then you found your issue. Check the fuel pressure regulator line for fuel, and do a simple vacuum test on the FPR. After that its time to raise the bed and replace the pump.
I like that you say it sounds like detonation, a lean condition. That noise is easy to decipher once you know it so it is likely time for a fuel pump.
Usually I do a fresh fuel pump whenever I do a new/refreshed engine especially if you have never been in there. If the truck sat for any length of time while waiting for the new heart......replace the pump. Fuel pumps do not like to sit
Bosch or Walbro pumps are the only brands I will install in my own trucks. We have had excellent luck with the new bosch blue replacement pumps (rockauto). If your fuel gauge works properly then just plan to replace the pump, strainer and filter (yes again) always do a new filter at same time as pump.
If you used the 93 fuel rail on the 97 engine or had the intakes off, fuel rail off you should also bench test and clean the injectors and install all new O rings....I also do this with every engine swap.
I have been through it all over the years!!
Last edited on Sat Apr 6th, 2019 12:33 pm by 410customs
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks