Hello! Long time no talk!
So lately my 911E starts to run poorly after it warms up, eventually stalling.
The problem occurs after the car has come up to temp, and usually happens faster and more severely if it’s > 80F outside, or the oils been up over 200.
Symptoms start out as popping/backfiring after a heel&toe downshift and quick acceleration onto a different road… from there it escalates into missing/stumbling/hesitating at WOT at 6000, then 5000, eventually it just won’t go past 5000 rpm, and can be hard to even get up to 60 mph, from there the car won’t idle at 1200 and eventually it will just stall out if i’m at a light, or a stop sign, or just cruising above idle…
Besides that behavior when warmed up, run for 30 minutes or so, the car just feels a little rough, it hesitates, and seems to be running a bit richer than usual even when warm.
if i park and wait and cool off for as little as 10 minutes, it’ll fire up like nothing happened.
I'm looking for suggestions on what I might look at next... fuel pump?
Fuel pump? Seems to happen faster / more severely when at < 1/2 full... but not always, i was missing on 7/8 full last weekend...
Car details:
1970 911E, stock MFI motor, w/ points and everything. 114,000 miles, only engine work was rocker shaft broke once, and I’ve got carrera tensioners…
Zims fuel pump
Good oil pressure
Starts well when cold, or shortly after shut-off… wait 1 hour and it takes some cranking to get going.
Normally idles at 1200, was recently idling at 1800-2100 when warm, so I put a drop of oil on the felt pad under the rotor and that seemed to clear up the idle, but not the missing/hesitation. (this is not the first time I’ve fixed the idle problem in this way)
I recently checked timing, dwell and adjusted the valves (not that I think the valves have anything to do with it, just due) nothing of interest there that I could see.
Thanks for any suggestions on things to try next!
And if you've read this far... obligatory recent photo...
