Hot Start Issue - One More Issue Example - For the Records

[Pawel66]

Just for future generations, in case someone is looking at hot start issue, which is fairly common - an issue and diagnosis.

The symptoms: difficult hot start. Car running ok, starting cold in 3 seconds after several weeks of parking, etc. Just would crank and not start when hot - neither after 10 minutes nor after half an hour.

The issue: restricted fuel supply through the main supply line.

How figured out: first was to look if spark plugs are wet or dry while cranking to try to start the engine. They were dry. Then measuring fuel flow right after the fuel pump and then at the main filter showed low flow at the fuel filter and a very good flow right after the pump. Could not detect it by blowing air through the line. Only by checking the fuel flow.

Hot start ok once the obstacle was removed. I will not write what the obstacle was, because everybody would laugh at me.

Note: for those who have the TTS replaced by the Bosch unit - please note it activates the CSD at all times, also when engine is hot (it just does it for different amount of time or just when cranking, depending on temperature). May consider not to depress gas pedal when starting or depress it just slightly.

[stickandrudderman]

Go on Pawel, tell us what it was!

[Pawel66]

No way until several shots of vodka are drunk one day.
Instead I added a very clever piece I omitted before about dry spark plugs.

[mrfatboy]

Was it a fatberg???😜😜😜😜😜😜😜

https://en.m.wikipedia.org/wiki/Fatberg

[Tyler S]

Did you forget to take the plastic wrapper off the fuel filter?

[Mike Hughes]

I was thinking of something related to the fuel filter, or the lines connecting to the filter housing, too!  We've all done silly things, so you might as well tells us Pawel, inquiring minds are going to zero in on it eventually anyway! ;^)

[Pawel66]

Ok, I thought maybe for others to avoid it, although it is difficult to expect anybody would do something similarly silly...

I squeezed the soft part of the fuel line between fuel pump cover and the floor, applying too thick and soft rubber sleeve protector. I did not cut it, just squeezed it and did not notice...

[Shvegel]

I place a high priority on lighting in a shop for exactly that reason.  As I have aged there now doesn't seem to be enough light in the world for me.  I now have a very large bright LED panel abouve my work bay and a 4 foot long flourescent style LED for under the car.  I like the large format because it prevents shadows that you might get from a single small source. 

[Pawel66]

Yes! Lighting was the cause!
That will be my story and I will stick to it!

[A-230]

My long lasting warm start problem on my -64 disappeared when i set a pushbutton in circuit with the cold start solenoid. If it does not start in 2 secs I just push the button a bit of a sec, and it starts immediately, always.

[Pawel66]

This solution is used by many fellow Members and seems to be very effective. I think it compensates for the issues of the original TTS set up. I think the Bosch TTS replacement takes care of it as it activates CSD also at 80-90 degrees temperature range.

In my case this would not help as activating CSD has no effect as CSD was not getting enough fuel supply...