[craig300]

The ‘71 also has the idle adjustment knob on the ECU, my ‘71 is so equipped , and it’s the correct ECU for the year. I have a gunson ex gas analyzer that I used to set the idle mixture, bought from the UK. I’m not sure it makes much difference though. The biggest problems I had when I got the car and running rich were the coolant and air temp sensors, once I replaced those, and set the valve lash and TPS all is good. I also have the Beck Arnley injectors, they’ve been running fine since I installed them a 3-4 years ago. Possibly your fuel pressure regulator is dodgy? Possibly the comb in your tps has a worn, scored line and makes intermittent contact. I’ve read that the comb can be slightly repositioned to contact on an unworn surface , I’ve never had to do that though, so can’t offer any experience.

 

[craig300]

Ron, I had cross referenced the ECU’s on Dr DJet, so given the source, hard to doubt. Agree that probably doesn’t have an impact on the current problem. But always good to “know what you have”.

Dalsim, are you sure the fuel is clean? No sediment in the tank and fuel filter doing it’s job? Would be worth a new, correct fuel filter: they’re different between the 70-71 and 72+. Also might be worth blowing out the fuel and return lines from front to back while disconnected. Do that outside. And how’s your ground strap from the bell housing to the frame rail? Worth cleaning those connections too, and some ACZP.

 

[craig300]

Three port fuel pumps are available. I have one of these, 7 years, still running fine.

iRoll Motors Inc.