1985 308 qv no power no rev

I'm no expert but I'd check the crank sensors, sounds like some of the cylinders aren't firing at all. The excess fuel is going into the cats causing them to overheat thus turning on the slow down light.
if you do a search for crank sensors, I think you'll find an easy (ohmmeter) test procedure for them.(there are 3)

 

Here was the thread from my issue with the crank sensors.

http://www.ferrarichat.com/forum/showthread.php?t=102649

 

Which slow down light came on? One or both?

 

(It's a single-cat '85 so only the single thermocouple/ECU/light).

mas -- Are you saying that your mechanic has also already confirmed that the ignition is all OK yet you still have the problem?

 

There have been so many 308 owners over the past year that has had this same problem...mine was two years ago. Very common and no symptoms to tell you you're about to have the problem.

 

I have two extra sensors if any one needs them.

 

Mine was caused by a bad Lambda Relay......its a Porsche 928 part.

 

This is what they look look... straight from the nice yellow box:

http://www.ricambiamerica.com/product_info.php?products_id=194496

 

I would check both banks ignition before driving the car any further. It sounds very likely one bank has dropped out and the car could be running on four cylinders. It seems rediculous, and I would never have believed if I had not seen it myself, but the cars run very smooth with one bank shut down. Symtoms identical ie dramatic loss of power, wont rev, etc...

But, the car is still dumping fuel into the non firing cylinders, and the excess fuel is burning in the cat and so many things can cascade you couldnt believe it. Cat can catch car on fire if your not careful, due to excessive overheat, muffler can melt, at the very least.

 

Sounds like you've lost a bank. Pulling a couple of plugs should tell you which one & from there just start working through all the things that have been mentioned. Most likely culprits are the crank sensor(s), or possibly the ECY,coil, or the Coil-Dist lead.

If you have lost just one or two cylinders then look for holes in the spark plug extenders.

As has been indicated, don't drive it till you've fixed it - stuff will start melting.

I.

 

They have gone to a good home.

 

Is the tach working?

 

please let us know your findings after you have confirm the problem and/or the solution thank you much.

 

Is it Popping or Backfiring? That could indicate a problem with one of the 2 computers.