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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.The 1994 had known issues with a failing fuel pressure regulator so I would start with checking the fuel pressure, normal pressure should be right at 32 to 45 PSI , anything higher then 45 PSI can cause the engine to over fuel. One other thing to check is to remove the vacuum line from the regulator and see if there are any signs of fuel in the line. If so then the regulator is leaking. Check this for me and post back if need be and we can work from there.
Have you check ed the fuel pressure ?Has the computer been scanned to see if there are any fault codes setting?
If you can do both and post back with the results I can help you from there. I'm here all day.
Popping through the intake can be cause by a couple of thing, one would be low fuel pressure and the other would be a cam timing issue . I would get the fuel pressure in specs before suspecting anything else.
I'm not saying the cam is the problem, I'm thinking you need to make sure the base timing is set right as well as the firing order. If either are off it can cause a backfire through the intake, with that being said I would make sure the fuel pressure is at least 32 PSI, a lean fuel condition can also cause it to back fire.
If the fuel filter is restricted it sure could cause low fuel pressure. If you only have 10 PSI you have either a bad filter or the pump is failing . You need at least 32 PSI. The 10 PSI is likely the cause of the backfire as well.
Well if your only getting 10 PSI of pressure then it is defective providing the filter is clear.
You need at least 32 PSI for the engine to run properly.
Your very welcome, Im here if you need me.
Since changing the fuel filter what are you getting now for fuel pressure?
You need 32 to 45 PSI in order for the engine to run properly. If you still only getting 20 PSI then you have a failing fuel pump.