Warm Restart

I have a 1985 Mondial Cabriolet QV. It starts great if the car is cold but upon warming it
will only start if I hold the gas peddle down on the floor until it catches.

I've been reading the past threads that discussed the issue. One of them suggested that
it could be a problem with the "check valve". I crawled under the car and looked for a
check valve coming off the fuel pump. All I saw was the banjo bolt with a pipe connecting
to the accumulator. If I go and buy a check valve it looks like it goes between the FP
and the banjo bolt. Do I assume that the direction of the fuel flow is towards the accumulator and it stops the fuel from flowing back towards the fuel FP?

Any help would be appreciated.

Thanks

bruce

 

I don't have your answer but section D (Ignition and Fuel Injection System) of the repair manual offers a pretty good description...

Workshop Manual Mondial 8 QV

If the link doesn't open right away just hit the browser's refresh button.

 

Hi,

Once it starts is the idle normal? Or is high or do you have to keep your foot on the pedal to keep from stalling.

Lino

 

Once it starts from a cold start it works fine unless I happen to stall it.

bruce

 

It's fixed and the wisdom of "Ferrari Chat" prevailed!

I printed all the threads regarding the "warm restart" issue.
I went through each test.
It came down to either the accumulator or the check valve.
I happended to have a new check valve for the car and changed it.
The car works 1200% better. I tried blowing through the
check valve and I could barely get any air to pass through
the valve. I am surprised that the car even started and ran with
a clog that bad.

Anyhow 1 more nit and the car will be 100%.

bruce

 

Can you please post a picture of the check valve, where it is located and where you got it from? I have a similar issue.

Thanks,

 

Hi, I have warm start issue on my euro Mondial 3.2. Any one can share picture of the check valve & where it is located? Thanks..

 

Hi Bruce,

Well done on fixing the issue. Do you have the part number for reference?

Many thanks.

 

That is still a mistery for me too on my 3.2 as I have been searching for them too and I do not have the air injectors #4 on my engine. I believe only the US and Swiss models only have these on the 3.2. the other Euro 3.2 version do not seem to have the below air injection system. Please someone correct me if I am wrong! It would be the green circles.

@Peter: it's part# 121808. My guess is that you do not have the below system. Do you have a warm starting issue?
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The "check valve" in this thread is the check valve located at the output fitting of the fuel pump = F PN 120098 (all version F with Bosch CIS have one -- although it's changed form over the years). If you search on "120098" you'll get prior threads with pics and the Bosch PN -- so that you can buy it at a reasonable price

 

Hi Chaps, I too sometimes have to crank for 5-7seconds for the motor to catch from hot. The guys at Ferrari told me this was normal and that I should keep the throttle pressed to the floor until it catches and then release. I apply this system of starting and it always works and the car runs normally.
All my cars ie Countach Aston V8 etc are on carbs and the same rule applies for hot starting them, so I have never questioned this advice on an old Ferrari injection system.
Are you saying that the Ferrai should start from hot with no throttle at all just like a modern car?
Regards Bell.

 

Cool! thanks for the correction! They call it a Non return valve on the euro versions

Difficult to find the PN, but I think it is PN 1 583 386 514. (PN 1 587 010 536 looks like a thinner threat on top) I'll check mine for a PN when I take of the lot when I have my new Fuel Accumulator.

US one #88: (Same place on a Euro version)
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yup, during my hunt I drove several. Need to say only '85 and newer. Most started immidiately without hitting the peddle when warm. The one I have now I noticed it immidiately that it had an issue with warm start. Not sure about the carburator Mondials though.. Just recently looked at it and found out my fuel accumulator is leaking like the Niagara falls..

http://www.ferrarichat.com/forum/mondial/424171-fuel-accumulator.html

 

Could you smell fuel or do you mean some kind of internal leak that over richens the start and hence the need for a fully pressed throttle to get more air in to compensate?

 

Sometimes a fume of petrol, but my drain was closed up with a plug. I guess the previous owner (or service garage) thought this was a good idea.. however it supposed to have no return to that the or no plug on the drain what Steve mentioned for a Euro version. I just should be open on a euro version. I checked on eurospares and indeed for our continent(s) it is open. I took it off and the fuel was pouring out, which shouldn't.

 

Very interesting!
I don't have a hot start problem anymore since I fixed the melted connector in the fuse box but reading the start of this thread made me wonder in case it happens again so I can be aware of it.

However, I actually replaced that non return valve shortly after I purchased the car because when I would start from cold the brake peddle would sometimes feel too hard and would not depress, rather like when the ignition is off.

When I took it to Ferrari they said it was the non return valve that was causing the brake peddle problem because its part of the vacuum system (please correct my bad interpretation) and that particular part is no longer made in metal as on our cars but is the same part as used on a 430 and is now plastic and costs under £4 (about $6).

Sure enough it solved my brake problem immediately and was the cheapest and quickest fix so far.

But how and why would this non return valve affect starting when warm?

Thanks.

 

By the way I forgot to add that whenever I start the car from cold or hot I always depress the clutch, turn the key and never touch the gas, just as it says in the handbook and is perfect every time. No need to rev unless I haven't used it in a while but only after its started on its own.

Cheers.

 

That would be indeed a check valve of the vacum system. However, not the check valve that Steve corrected me on in post #9

 

Yes, its the part that you circled in the first diagrams which i replaced. Looks like no. 3.

So many valves and check valves to chose from...

 

I found two Bosch part numbers for the check valve: 1 587 010 532 and 1 587 010 536. Anyone can confirm which one is for euro 3.2? Thanks.

 

1587010532 is the correct one for F PN 120098 -- the "gold" one with the larger coarse mounting thread on the right in this photo:
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Thanks Steve!!

Hope new fuel accumulator & check valve will solve my hot start issue as I already bypassed the fuel pump white connector in fuse box & replaced fuel filter..