Mitchell ondemand says 2.3 to 3.6 is normal fuel pressure. I'd check your carb

 

But who's right? How can there be such a difference in specified fuel pressure??,,,BB

 

Thats true i'd say mitchelle but how about calling your local mazda dealer or guru

 

Just looked at it. If the following is right, then the plug wires are correctly installed.,,,,BB



Front coil is trailing, and goes to T

Rear coil is leading, and goes to L

Front bottom is L1 Rear bottom is L2

Front top is T1 Rear top is T2

 

That's correct.



The stock Nikki runs best on about 2.5 - 3.0 psi. If you're running an aftermarket fuel pump, try setting it a little lower. Also, try another fuel pressure gauge just to make sure. My Craftsman gauge read 2.0 psi when I had 5.0 psi, but my Mity-Vac's gauge read correctly. But if your problem is bucking, high fuel pressure won't be your problem.

 

I have a mighty vac as well. Not sure if I have all the attachments or not still. Not an aftermarket pump, well, not an adjustable one anyway. The stock canister style are not adjustable, correct? It didn't appear to be when I changed it.,,,,BB

 

Do you have mechanical secondaries or vacuum secondaries? Sounds like the secondaries on the carb are not opening all the way for you. I had the same problem that you are having with above 3000rpm operation with my vacuum secondaries on my stock Nikki.

 

Check your fuel filter. For poor running when its raining out, replace cap/rotor and check your spark plug wires for cracks.

 

Has a new fuel filter, under the car in back, and between the firewall and carb. I gave it up for now. I am waiting for a healthy check to come in the mail, and it's going into a shop. I only know that no american car I've had has been this much trouble,,,,BB

 

Well, it went to the shop finally. Guess what? They claim the plug wires were not routed right? They "corrected" it for me. They also informed me that the compression was awesome. 70's and 80's. They also said the accel pump on the carb was not pumping fuel well, and the mixture screw was bent. This kept it from seating correctly. So, it got towed over to the guy who "used" to do their Nikki's, to be cracked open and repaired. Fuel pressure they say is on the low end at 3.5(I was right, according to Haynes) SO, I may be buying a Holley and a regulator, which is cheaper than the stock style pump at the auto parts store. I am glad this nightmare is coming to an end soon.(I hope!),,,,BB