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Category: Chevy
Satisfied Customers: 26432
Experience:  ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
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Have a ignition prob or maybe fuel 1995 chev sub 7.4, had no

Customer Question

have a ignition prob or maybe fuel 1995 chev sub 7.4, had no port for fuel pressure check, ordered adapter checked pressure at idle 30 28 seemed ok except was rich on start and stumbled on acceleration all new ignition parts new distributor all sensors
except o2 no codes
Submitted: 2 years ago.
Category: Chevy
Expert:  AMEDEE replied 2 years ago.

Hello and welcome! To test the fuel pump correctly, you will need to deadhead the fuel pump verify the fuel pump can make at least 47 PSI.

If the deadhead pressure is greater than 47 PSI, replace the fuel pressure regulator. The OE regulators are currently no longer available. An aftermarket regulator will be required. The correct operating fuel pressure is 28-32 PSI. The pressure should always be steady.

Expert:  AMEDEE replied 2 years ago.

Some other possible causes would be bad fuel injectors, bad engine coolant temp sensor or even a bad ignition control module.

Customer: replied 2 years ago.
New pump makes 80 static 28 to 30at idle, new ignition module all new ,coil pick up ,module cap rotor plugs, compete distributor, and coil, new fuel injectors, plugs, wires T stat
Expert:  AMEDEE replied 2 years ago.

Hello! Before we go any further, I just want to mention that just because these parts have been replaced, it does not mean these parts are good. I have seen bad new parts right out of the box.

Customer: replied 2 years ago.
I have been in the industry for 40 plus years I know parts can be faulty out of box
Expert:  AMEDEE replied 2 years ago.

Ok, good. I just wantedto mention that so after this is all said and done, you cant come back and say, "oh, this just turned out to be a faulty new distributor".