voodoo51

I will do inspection before buying. If something wrong with the car i will now.
In several days previous owner will end some works with engine and then we will do inspection.

Here are the list of parts for engine (previous owner purchased them):
>>>> 93010090802 -Seals
>>>> 93010090104 -Seals
>>>> 93010396800 -Piston Rings
>>>> 93010314715 -bearings
>>>> 96410190100 -bearings
>>>> 93010221300 - flywheel or (93011602103 и 93011623002)
>>>> 93010432150 -направляющая клапана -16шт
>>>> 93010546100 -шайба -20шт
>>>> 90024300100 -штифт -2шт
>>>> 99610143570 -вкладыш -2шт
>>>> 99610113780 -вкладыш -2шт
>>>> 91164154102 -датчик
>>>> 99970147340 -уплотнительное кольцо
>>>> 93011023000 -уплотнительное кольцо
>>>> 93011015801 -муфта -2шт
>>>> 99906223902 -шпилька -12шт
>>>> 91111092900 -выключатель
>>>> 93011037900 -уплотнение
>>>> 99919213150 -ремень
>>>> 99908500102 -гайка -6шт
>>>> 90121119601 -шланг
>>>> 93021119601 -шланг
>>>> 93012319105 -прокладка -2шт
>>>> 93021162201 -шланг -2шт
>>>> 90007413603 -болт -9шт
>>>> 93011608111 -выжимной подшипник

But I'm afraid if the hot start problem could cost a lot. That's why I am asking what is the maximum cost of solving this problem

voodoo51

Could you please clarify what abbreviations WUR settings, FPR/CHT/COS sensors, CDI, HTS and FPS mean? Thanks a lot for your help!

mel_t_vin

WUR: warm up regulator
FPR: fuel pressure regulator
CHT: cylinder head temperature
COS: ? oxygen sensor
CDI: capacitive discharge ignition
HTS: ?
FPS: ?

I don't believe the "FPR" is a 930 specific part. Instead of a FPR, the 930 uses the WUR to establish a reference/control fuel pressure, a cold fuel pressure, and a warm fuel pressure.

If I recall correctly, on a 911 engine, the CHT sensor is near cylinder 6. Not sure where it resides on a 930 engine.

The CDI box [heart of your ignition system] resides in the engine compartment, drivers side, along the fender wall, in front of the fuel filter and accumulator.

And since 15 months have gone by since your last post in this thread, are we to conclude that you purchased the car in question? If so, what was the root cause of the hot start issue?

voodoo51

Allen, thanks for your help!
I purchased the car but still has not solved hot start problem.
Because there is no good shop dealing with classic Porsche here. Only modern 911, Panamera, Cayenne...
I have last hope with one man (gave him my car yesterday). Maybe your answers will help him.

voodoo51

Deleted

voodoo51

We think that it must be WUR. It's always the same pressure (hot or cold) - 6 kg

mel_t_vin

Well, that could certainly cause starting/running problems. Go back and look at Shannon's reply in post #11 of this thread.

I might have to break out pen and paper to do some metric-to-English conversions, but, 6 kg doesn't sound right. I would've thought in Europe, WUR pressures [control, cold, hot] would be measured in bar. Did your mechanic make any readings in bar?

voodoo51

Maybe I was mistaken and there were bars

voodoo51

WUR was checked and cleaned.
And also we will replace fuel pump reversing valve.

Next week I will see does it help or not.

Thanks all for assistance.

mel_t_vin

Checked and adjusted?

Make sure your mechanic understands the purpose/function of the WUR. It is a significant part of circuit that controls you system, cold, and hot fuel control pressures. If not properly adjusted, your cold/hot fueling will be out of specification for the given operating condition.

voodoo51

Adjusted too.
In few days we will see is he right or not.

voodoo51

At last I am happy. The hot start problem caused by fuel metering unit (maybe I am mistaken with translating ).
So there is no problem with starting at all. No matter hot or cold.

Thanks all for your help!!!

mel_t_vin

Congratulations!

The fuel metering unit is that centrally-located assembly, toward the back of the engine [nearer the firewall], that the air cleaner housing attaches to. On its right side, it has 6 metal fuel lines that run down to each cylinder. Is that what you're referring to?

Usually, a hot start problem is traced to the fuel pump check [anti-reverse] valve or fuel accumulator [driver's side near firewall, next to the fuel filter].

In any case, hopefully you still have time for a few long trips to the countryside before winter sets in.

Happy motoring!

fullquack

I was going to say injectors, that was the problem with mine, but I see you have had them changed so.....???

voodoo51

Thank you.
Yes, that is what I referred to.
I will try to drive my car as much as I can before winter.