Bosch K-jetronic - Hot Start Problems

[@MrGrandell79]

Great video. Thank you. Question.. Why not change the fuelpressure to match the higher opening of the merc injectors? On the WUR unit. I have the merc ones on my Scirocco but i dont have exactly these symptoms as you have. Mine does not always fire up on all 4. Like 10% of the times. Do you want to share the list with the differnt injectors? Might search for the lower pressure ones just to see what happens..

[@GreyGooseRestorations]

I'll add the two part numbers used into the description as it'll take some time to translate the list into English. You could raise the system pressure by .5 bar but that would then provide more fuel and the distributor would need checking for balance.

[@hamishpidgeon5320]

Awesome. Thank you. Ferrari 456 and FIAT X19 same issues. Much obliged from Japan.

[@GreyGooseRestorations]

Thanks for the info 👍

[@danielclare2344]

Great video . Have a hot start issue on my 9a corrado . Parked it up on the head of it . New fuel pumps , new injectors , new check valve , new accumulator . Wrecks my head

[@GreyGooseRestorations]

Is your the later corrado with KE-jetronic?

[@wsmallridge]

Really interesting. I have the Merc injectors in my standard KR and have been fortunate enough not have had this yet

[@GreyGooseRestorations]

Interesting 🤔 I think it depends on what pressure the metering head is at, the lower the pressure the less the issue potentially

[@wsmallridge]

@@GreyGooseRestorations I haven’t adjusted the WUR as the car otherwise runs very well so assume given it’s age (unless someone has been in there before) it probably is lower in all likelihood. I guess I should measure it but not sure I want to tamper with it since it’s running well… the only issue I have is if the car is left standing for a long time (week or more) it starts on the button (with the fifth injector) but either immediately stall or if i prime it on ignition a few times runs like a haunted shithouse for a while until the idle smooths out almost exactly as your described for the hot start. Like fuel is only making it out sporadically out of the injectors. Once it’s started once it’s no problem again unless I leave it parked up for ages again…. Like the toy it is this and given the unreliability of our weather this happens too regularly 😅

[@GreyGooseRestorations]

@wsmallridge it may just be isolated to the main system pressure potentially but like said I'm still investigating

[@rogercamilleri4844]

I have this hot start issue on my Bentley Turbo R with a KE Jetronic, cold start first time and when engine warms up and leave it for 15 min or even less it takes about 12 cranks to start, but will always start, I had changed the injectors but not sure which i put in there, for sure they were Bosch, so in your opinion which injector should be in there, maybe you can give me a part number please, thank you for a very informative Video

[@GreyGooseRestorations]

Hi, thanks Should be 0 437 502 040, also 0 437 502 012 is the same injector just listed for porsche

[@vwpieces]

Thanks and always appreciate the vids. I'm running 9A on 16V rocco fuel system in my 83 Jetta. It is USA spec parts and been running the 190E Merc injectors for Almost 20yrs. Never a hot start issue. But this will give me a heads up if the issue does arise.

[@GreyGooseRestorations]

Interesting, thanks.

[@kerrymathers7439]

Great video. Especially you mentioning what Audi did with the Quattro 5th injector for hot starting. With the 5th injector it grounds/earths via the thermal switch. So my question....... Could we simply splice in another wire to this thermal switch earth wire and use a push button to override it [to earth] This is for a race car that could sit for approx 1/2 to 1 hour between sprints [basically a hot start hack] Comments appreciated

[@GreyGooseRestorations]

Definitely you could do that, it's a simple system and easy to manipulate to the individuals benefit 👍

[@terryraymond7984]

Oh the Golf or the USA Rabbit only had the 8 valve engine that used the K Jetronic

[@GreyGooseRestorations]

This problem appears to affect any cast iron kjet unit

[@ma_rocco1983]

Great video as always, thanks for useful info.

[@gavinhibberd1708]

Many thanks, great video again. I have hot start problems on my 1983 1.8 MK1 Golf & have discovered that the accumilator was deleted during a recent restoration!! A new accumilator is being fitted this week and I was thinking about a new set of injectors - possibly Merc... think I might go for the steel ones now!! Do you know if all DX engines use the same injector and if you get a moment coulkd you give me the Bosch Part No. Thanks again.

[@GreyGooseRestorations]

That'll do it 🤦‍♂️ The DX came with M10 thread injector

[@TruckerKingJM]

Hello there! I have the same problem with my Jetta GTX 16V K-Jet with the original Bosch injectors. Engine is tweaked to about 175 bhp but had the same problem with the engine completly stock. Also got the same problem from time to time on my Audi 80 16V KE-jet...

[@GreyGooseRestorations]

It's a pain of a issue, not many things can cause it but again it's a nause to fix

[@mcfly6667]

I was leaning to the Merc injectors. This additional info will make me want to stick with the original steel ones that came with the K-E unit. But the external FPR should help mitigate hot-start any way. Also you didnt use this term but "vapor-lock" I think means the same condition you are talking about.

[@GreyGooseRestorations]

Agree with that, vapour lock, that's the one, spent ages thinking of a better way to describe it haha

[@julianholland4359]

Hi. I have a tvr tasmin. 2.8i which needs setting up. Where are you.

[@GreyGooseRestorations]

Located North Wiltshire

[@The_animegrinder]

Do you have a link to the steel Bosch injectors? I am currently running the brass Mercedes ones and have hot start problems.

[@GreyGooseRestorations]

Best place is from Car Parts in Motion with the part number 0 437 502 023

[@The_animegrinder]

@@GreyGooseRestorations And those are fine for 8V? I have a 2.0L ABA block and JH 8V head, ported, with a mild cam and dual exhaust and 2" tubing. Just trying to get the best possible injectors. And...I do have a hot start problem, especially after the hot engine sits for about an hour in the sun. Cold starts are no problem at all.

[@GreyGooseRestorations]

@seanporter6795 personally I can't confirm for the 8V but I'm going to advise not to use the brass merc injectors for any cast iron metering head so it stick with the steel ones

[@The_animegrinder]

I just tested the Mercedes 047 injectors and the OEM VW ones, as well as the shorter steel BMW injectors. The Mercedes ones crack about 2psi higher than the other two. Not much difference.

[@GreyGooseRestorations]

What's the part number on the other injectors out of curiosity

[@devendrandevendran9602]

Hi there. Great video. Thanks for the advise. I recently got a 16v that’s having some issues. Battles to start. Runs rough. Sounds and feels like running on 3 cylinders. After watching your other videos and a bunch of research ruled out spark as a problem and am now at the injectors being the issue. Question where are you finding the right part injectors? 0437502. Battling to find them in SA. I’m in London in a few weeks and thought I would get them while I’m there. Any pointer where to find them and indicative pricing would be appreciated. 🙏🏽

[@GreyGooseRestorations]

0 437 502 023 are the ones to go for, id check stock near where your visiting for example euro car parts or a TPS (trade parts specialist) and potentially order ahead of time then swing in and collect, cost wise around 30-40 per injector

[@totte1015]

"You can hear the spring doing its job" (accumulator) Is this a quite loud "ping" noise that almost sounds like heat expansion sound of the exhaust manifold?? And I also have other info regarding this, I have the steel injector (I guess its 100% Bosch), and I have EXACTLY this issue anyway. Does this mean I have any of the other issues you are mentioning? Accumulator failing, seal in metering head or fuel check valve? Its funny because I also have the squeaky belt EXACTLY like you... I havent gotten around to fix it, is it just to replace it with a new one?

[@GreyGooseRestorations]

My noise was the PS belt and just needed adjusting. The Accumulator noise can be very similar to the ticking of an engine as it cools It's hard to say for certain, best way is with pressure guages as you can see as soon as you turn the engine off where the issue would be, as in if the pressure drops to 0 quickly then there is an issue at the fuel distributor / or leading backwards to tank on the fuel feed side

[@stdavidboy]

5 Cly Audi 2.3 NG has same problem, pain in the butt!

[@SimBallStudio]

Hello mate, love your videos and would really appreciate a bit of advice when you’ve got a sec, I have a mk2 scirocco gti dx. Bought but never ran it, was driven onto a trailer. Car starts well on key but within 10 seconds or less will run up and die every time. Cold start plugged in /unplugged. Relay bridged/not bridged.. only actual issue I can visually see is a leak from the sensor on the right side of the head.. just wanted to see if it was a simple obvious fix or more scratchy head days.😂 kzbin.info7RuqO0N7xT8?feature=shared

[@concrescentone]

Okay hear me out. That FIRST crank you show did not crank fast enough. not even close. Slow crank. Even the second one where it starts it's not cranking fast enough. Engine did start the second go with only a few cranks, but I'm hear to say you need to look at the starter circuit.

[@GreyGooseRestorations]

Nothing wrong with the starter system, it spins over that speed and fires up within 2-3 engine rotations and always has done.