Henley1

any ideas where to start? i just bought a 76 911 with a 84 3.2 above say 5k it breaks down sometimes? id assume its electrical? any thoughts.... other then that its as much fun as my 996 x50 ?? go figure.

Steve Weiner-Rennsport Systems

Engine swaps present a whole set of challenges relating to the quality of the conversion. As they say, the Devil is in the Details so everything warrants close inspection.

In general, such issues are rooted in ignition and fuel delivery problems so this is where to begin the troubleshooting process.

Make sure the plugs, plug wires, cap, rotor are all in PERFECT condition. If you have no record of when they were replaced, install all new parts. You cannot fix a fuel problem with a resident ignition one.

After that, check the fuel filter, fuel pump delivery rates, DME relay, and in-tank fuel filter.

There are lots more, but this is where to begin the process.

Henley1

the tach seems to sweep as well. or flutter i guess. should i check the coil as well.

Steve Weiner-Rennsport Systems

If the tach is unsteady, the very FIRST thing to check is the battery, cables, VR & alternator.

Henley1

im new to this ... what is "vr". thx in advance for your input

Amber Gramps

Voltage Regulator.

Steve is always right. ....that said, I'd replace the DME relay first. It should be under the driver's seat if the transplanted electronics where placed where they would be in an '84. It's the small (1"x1") square black thing next to the computer. Buy two new ones while you are at it. They go bad. And check your grounds.

puddy

How are you making out Lee? Any luck getting her running better?

Chris.

Henley1

yes i seem to be zeroing in on it.