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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Vacuum line diagram This vehicle has a miss and no codes are

Customer Question

Vacuum line diagram
This vehicle has a miss and no codes are present. Does anyone have a diagram for the vacuum lines? It has the smaller V8
Submitted: 1 year ago.
Category: Ford
Expert:  Jeromy Madison replied 1 year ago.

Hello. What is the issue?

Customer: replied 1 year ago.

Has a hard miss. Struggles to go faster that 40-50 due to the hard miss. The warmer it gets the worse it drives. Idles ok but mis fire under a load. Can't get it to throw any codes

Expert:  Jeromy Madison replied 1 year ago.

I have worked on several of these, and for some reason they rarely throw a misfire code.

By what you are describing I highly doubt it is a vacuum issue.

Do you have any diagnostic equipment?

Customer: replied 1 year ago.

Just an OBD II scanner

Expert:  Jeromy Madison replied 1 year ago.

Ok, a scan tool so that you could look at fuel trims would be very helpful, but I may be able to walk you through some basics.

The first thing I would try is to find the cylinder or cylinders that are missing.

Are you comfortable doing a few test?

If you are then try this.

Start the vehicle, then unhook one fuel injector at the electrical connector and listen to the engine to see if there is any change in how it running. If it runs worse you know that cylinder is firing, if it makes no change then that one might be one that has an issue.

Let me know what you find.

Customer: replied 1 year ago.

Ok. I will have to pick this up later this evening. I'm not near the car atm

Expert:  Jeromy Madison replied 1 year ago.

OK, let me know.