Building a Porsche 924 Safari - Episode 5: Solving the hot start issue. 

Thank you for the clarification Simon!

Thank you very much!

Thanks! I have been subscribed to your channel for a while now too. Us 924 lovers need to support one another 😁

Yeah me too, how did I miss this channel! Good work diagnosing that fault.

Een setje dubbel Weber carburateurs op een 924 klink wel heel lekker! Ik heb jaren geleden geleerd hoe ik de K-jet systeem moest reviseren en afstellen en vind het concept van K-jet eigenlijk ook best gaaf, dus bij mij zal er niet zo snel carburateurs op komen. Een supercharger daarentegen, daar zit ik wel aan te denken...

@@GarageBiljon wel, de reden dat ik de ombouw heb gedaan was voornamelijk omdat er maar weinig personen zijn die dit systeem degelijk kunnen afstellen 😅 Misschien wel interessant om te weten mocht er nog eentje op de oprit komen te staan 😁

This one really did my head in, I was chasing it for quite some time. But all in this did not cost me more than 40 euro to fix.

Just struggling to decide where to put money from here. I'm nearly decided to fully scrap the stock engine and fuel system and put an LS in it as it would give more power with less hassle and issues. Any advice to get it going would be much appreciated, though, as I would like to keep it in its former glory as long as I can. I have driven the car multiple times, and it drives just fine until it is shut off and wont start again that is. 😂

Tough to give you advice without more information, what symptoms are you experiencing?

@GarageBiljon On initial start up (cold) it starts fine, 1-3 seconds. Sputters a bit for about 3-4 seconds then will run about 500-700 rpm for the first 10 minutes then it levels to about 900rpm. If at any point; before, after, during warmup, doesn't matter, the car shuts off; it will not restart. If you turn the key on for ~0.5 seconds, and it doesn't start, it isn't going to. It will turn over, injectors spray fuel, plugs have spark, it just will not start. Psi is 50~80 at the WUR as well from the fuel distributor. I've rebuilt the WUR, ultrasonic cleaned the injectors, and replaced the accumulators. I've also put in new spark plugs (old ones were fouled pretty badly) this changed the cold start a bit, but nothing for hot start. I've not yet cracked the fuel distributor open. That's my next step. I have a rebuild kit for it, and was going to spend this week tackling that in my free time. Beyond that, I can't think of what else it'd be. Previous owner has a ratnest of wires in the whole engine bay. I'm going through the process of cutting all those out and removing the 100 extra ground lines strewn about the place, hopefully that'll help some of the issue.

@@TheQuassom it sounds like flooding to me, have you checked that your cold start valve has not failed open? Also check the opening pressure of your injectors, if they open at too low a pressure i.e.

@@GarageBiljon I'll have to look into those and how to test them. I'm really trying to not chase the problem but grab it at the base. Haha

Thank you Vincent, I'm glad you like it! In your case I don't think it is the hall effect sender, I would start with looking at your fuel pressures, this sounds more like a warm up regulator(WUR) that is no longer functioning within spec. A simple way to check, if you do not have a CIS pressure tester, is to set you cars idle mixture when it is warm and sputtering so that it runs smoothly. From the sound of it, it is running too lean when warm so you need to make it richer. Then if my suspicion is correct you will struggle starting it when cold. If that is the case, you need to rebuild your WUR.

Try this link www.autodoc.de/autoteile/oem/035905205a

Yeah what are you doing 20 ?

Eens, ik was even de weg kwijt 😅