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Hello and welcome!My name isCustomerand I can assist you with your question.
What is the engine vacuum at idle?
Excellent! And what about at 2500 rpm?
Thats good. I would say by those readings the exhaust is not plugged up.
What is the fuel pressure at under a load when this happens?
The reason I ask is because it is possible that the fuel pressure is low. There is more to the fuel delivery system than just a fuel pump that can cause low fuel pressure. Low power to the fuel pump, restricted fuel supply line etc..
I would start by checking that and watch the oxygen sensor readings under a load to see if the engine is running rich or lean. That way you will know if the problem is a fuel delivery issue or not.
I am taking under a load. WIDE OPEN THROTTLE WHEN THE ENGINE HAS THE NO POWER PROBLEM
If the oxygen sensor was reading lean, .1 or so under a load, then I would suspect a fuel delivery concern. If the oxygen sensor is reading rich .8 or .9 under a load, then the engine has enough fuel.
Which one do you have?
Ok, thank you for that information. Either the oxygen sensor is bad, or the engine is simply has enough fuel under a load. If this is the case, then I would suspect an ignition timing issue. How did you set the distributor in place and how did you time the engine?
Do you know what the distributor sync or indexing is set at?
Right. I understand that. However, sometimes the distributor needs to be modified to get the reading in specs.
Let me send you the procedure.
Turn the balancer clockwise to Top Dead Center. (The rotor will be turning clockwise also)
The trailing edge of the metal part of the rotor needs to be 0.020" past the #1 terminal in the cap.
If the fuel pressure checks out good under a load, then here are some other possible causes.
Crankshaft position sensor
Broken/cracked flex plate
That is why it needs to be checked using a scan tool reading live data. There is a PID for distributor sync or indexing
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