[DeTomaso] indicator light/"overheating"/FI

[Thomas Tornblom]

adin at frontier.net skrev:
> A little background (cause I want to learn)
> 
> Vee-hickle in question: MIata powered by FI 302
> 
> The Miata temp gauge was running "stright up" unless I was caught in  
> traffic on a hot day - the running about 85% towards hot.
> 
> Installed temp gauge (with numbers) and discovered the following:   
> "straight up" seemed to be about 160 degrees; the "85% towards hot"  
> seemed to be about 195 degrees.  Long trip the car gets 25 mpg and the  
> tail pipes run sooty black.
> 
> After some reading (I am the FI dummy) hoping to find some clue that  
> the FI system would correct for altitude at some point (car came from  
> sea level to 7000 ft.) I learned that the Ford FI system will run in  
> "cold start mode" as long as the water temp is under 180 degrees.   
> Then I remembered the monkey that sold me the car said it never  
> overheats. (and the car was "mechanically sorted" -BWahahahahahahaha -  
> another story)
> 
> Pulled the thermostat - a "180" - and replaced it with a "195" .  Now  
> the car runs "85% towards hot" most of the time.  Sometimes the fans  
> come on (I can only hear them in the driveway w/ motor off.)
> 
> Anyway, some questions:
> 
> Will the FI brain "adjust" for altitude?

Yes.

There is, or should be, a BARO/MAP sensor somewhere that measures the 
air pressure. On speed density systems this sensor measures the intake 
manifold pressure, but on mass air systems it measures the surrounding 
air pressure. Make sure that the sensor is *not* connected to the intake 
if you have mass air. At least one Pantera-II ran like crap and the new 
owner found out that someone had connected the sensor to the intake.

On mass air systems the amount of air going into the engine is measured 
so it should adapt without problems.

I recommend you get the "Ford Fuel Injection & Electronic Engine 
Control" book by Charles O. Probst. It describes the Ford EFI in detail 
and has descriptions on all sensors, fault codes and also has wiring 
diagrams.

> 
> How much cam is "too much" for this FI system? (the car has issues  
> which I attribute to the cam)
> 
> Oil temp is running (what I think is a high) 215 degrees - easy  
> driving. Won't the oil run much hotter w/ hard driving?  (Unable to  
> test on public highways)

I believe it is good to keep the oil temp over the boiling temp of 
water. That keeps moisture out.

> 
> thanks in advance.
> 
> David in Durango
> 
> 
> 
> 
> 
> Quoting Christopher Kimball <chrisvkimball at msn.com>:
> 
>> That is the one risk, but if the car's not overheating, they're   
>> probably working!  Plus, since I have my digital relays timed to run  
>>  for 60 seconds after the car is turned off, so once I reach my   
>> destination, I can walk to the front and visually check, too.
>>
>> Chris
>> #3846
>>
> 
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-- 
Real life:   Thomas Törnblom             Email:  Thomas.Tornblom at Hax.SE
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