[urq] RE : Data point for hard starts when hot....
DGraber460 at aol.com
DGraber460 at aol.com
Sat Apr 22 13:53:33 EDT 2006
In a message dated 4/22/2006 8:54:43 A.M. Mountain Daylight Time, lar
aa at sympatico.ca writes:
Well, Martin, I think you might want to revise your judgment of the
injector cooling fan. It is indeed a lot easier to start now, like it
And to add another data point, I reinstalled my own stock ECU (I was
using Brady's chipped ECU since February) and unplug the injector
cooling fan switch, to rule out the fact that a chipped ECU may be
harder to start when hot.
Result: yes, the engine is very long to start when the fan is not
working, even with a stock ECU. Later the same day, I reconnected the
switch, drove the car on the highway, stopped, waited 15 minutes, and
she restarted right now ! So maybe the German engineers were right when
they mandated this system on the Turbo CIS cars... It has a role, even
if it is just to prevent evaporation when the engine is stopped.
BTW, those of you who have problems with hot starts, be sure that the
"intake" hose of the injector cooling fan is there, as it draws cool air
from bellow the engine compartment... Item 17, page 1-33, 18-00
> Let us know... I found it to be useless in Canadian
> summers anyway.
> The real problem was usually a leaky injector or system that did not
hold pressure for one or another reason.
> Martin Pajak
> > Louis-Alain Richard
> > So today, which is as hot as yesterday, will prove or
> contradicts that
> > this fan has a real role in helping the hot starts.
> Fingers crossed.
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Your observations verify what I have been saying for years. These cars
vapor-lock very easily. I have been having an increasing problem with this due to
the increased content of ethanol in our Rocky Mountain High gasoline. The
more ethanol the lower the boiling point of the fuel, and consequently the
greater tendency to vapor-lock even in winter. The presence of a tech bulletin
directing the opening of a hole in the injector cooling diffuser to cool the
injector lines also confirms what I have found.
I have to date used several adaptations to cure the issue. The hole in the
diffuser modification helped. A hood vent helped. A timed relay to run the
injector fan for a set amount of time was almost 100%.
On my current car I have wired the fuel pump and the cold start injector to
2 manual override switches. This has been a 100% cure. I just run the fuel
pump manually to circulate the "air bubbles" back into the tank (you can very
audibly hear the bubbling of the air back into the tank) and then bump the cold
start valve to get it to fire which lifts the air plate, and bingo - fires
up every time.
In OE state the cars will work fine with late eighties formula gasoline, but
not with the current issue from our petrol empires.
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