Here's the deal. I'm trying to get everything squared away and back to reliable/driveable condition on my Turbo II since it sat for a year while I took care of other business. Once it is 100% I can go about selling it to purchase the FD!! I would rather not sell it as a basket case.

THE SYMPTOMS:
Intermittent hard core hesistation when the throttle is applied (1/2 - full throttle). Does 1 of 2 things when you give it some gas :
1) Goes nowhere fast and backfires, sometimes will not hold idle.
2) Acts totally normal and goes into boost.

I'm afraid to full throttle it until I sort this out, as the engine has less than 20K on the rebuild.

This is RPM independent 2-4KRPM. Thought it may be fuel related, so I drained the tank, which was clean and I had put stabil in prior to storage. Put 10 gallons of 100% gas (no ethanol) 93 octane in. Same results.

Now when I brought it back from a testdrive, it stalled, and I heard clicking from a relay and narrowed it down to the Fuel Pump Resistor Relay behind the passenger headlamp. It continued to click even with the engine off.... That is as far as I got because it was dark and raining. So that would explain the hesitation if the fuel pump is not a full battery voltage, but what would the cause be? TPS out of adjustment? Pressure sensor bad? Knock Box?

Any help is appreciated,
Vince

 

Re-wire your fuel pump to bypass that relay. That's where I'm at right now, after tring, EVERY lean/hesitation fix or there.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/lean-issue-when-secondaries-kick-938879/page5/

 

bump - i bought Vince's old ride, and I'm still scratching my head about this issue...

 

so do you use a store bought relay or the relay under the hood? i am wanting to do this now, but have no idea on how to do it. i have a n/a to turbo, and i need to get rid of the two step fuel pump issue.