Ferrari 348/Mondial T starting problems

After having my 1991 Mondial T cabriolet laid up for the last ten or so years, I figured it was time to get tge old hirl running again.

Initially change both fuel pumps and got the engine running on 1-4 side. Removed injectors and fuel rails, cleaned and serviced. 5 -8 side injectors completely blocked and not operating before service.

Replaced fuel lines, filters and replaced fuel regulators (with Sard aftermarket type).

Now have fuel pressure to 1-4 side (monitored with test light on turn over) and pressure in rail, have in injector pulse and spark. When turning over the engibe fires just a little but not enough to get going.

I have sprayed starter fluid into inlet but really no difference.

5-8 side has spark, injector pulse but no fuel, I suspect a failed crank sensor. I gave tried wiring the fuel directly from external source but no change, just tries to fire.

What will stop the engine 1-4 side from actually starting? I am thinking the camshaft phase angle sensor?

This is a motronic 2.5, with the single throttle position switch, same as early 348.

Any suggestions

 

Does anyone have any suggestions?

 

Thank you all for the ijput.

Some progress.

Changed plugs and leads etc.

I have had the engine running buy poorly.

I have good injector pulse to 1 to 4 side but now no spark to 1 and 4. 2 and 3 run and make the exhaust hot but as I said nothing out of 1 and 4.

5 to 8 does not run, this I think is due to the crank angle sensor not providing power to the pump.

What determines spark to 2 and 3 and more importantly to 1 and 4.

I am thinking the each crank angle sensor provides input to 4 cylinder, 2 on each side. Would this be likely?

What other sensors are there they may have input to ignition?

I do have compression, fuel pressure and have replaced both pumps, new fuel filters regulators and cleaned out the black rubber boot that had disintegrated around each pump.

All suggestions will be appreciated.

 

After changing many components ftom left to right and right to left etc, I now have a car that starts as it should.

Not quite there yet, after start up and idling for a minute or two, a lot of smoke (really rich, unburnt fuel smoke) comes out of the exhaust, I think mainly from the 1 - 4 side.

What would cause this ultra rich mixture?

Is there a sensor I need to be checking?

 

I adjusted both MAFs, 1 - 4 was in the 900s, now set at 383. 5 - 8 was 312, now 383.

Start up was fine, working well, after less than 2 minutes the clouds of white smoke began. The smoke smells of fuel, it is not steam.

It would appear the start up cycle wotks wekk, then after dome initial basic warm up the smoke appears.

If I let it sit and cool down a little, then on start up no smoke, after a minute or two, the smoke is back.

Ideas please.
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Thanks for the suggestion.

Definately fuel, makes your eyes sting.

Like I said, from cold it starts well, idles well then after a minute or two goes into heavy smoke mode. Restarting after initial start (i.e. a little warm) has it go straight to smoke.

It is like there is a preliminary warmup (before coolant up to temp) before the ecu switches over to a mode that generates the smoke.

 

Thank you for the reply.

I am getting close now.

The smoke is much much less.

It seems I have had numerous problems but after more than 10 years what can I expect.

Initially the problem was fouled injectors, one half of the engine (5 -8) was completely blocked an inoperable.

I intermittently lost half of the coil pack on the 1 - 4 side.

The 5 - 8 side also had a sometimes ptoblem with the crank angle sensor.

The 3.0 bar setting on the fuel pressure regulators seems to have been much much higher, this was rectified by reducing the fuel pressure until the idle dropped away then bringing it back up a little. I did have a pressure guage as supplied with the City of fuel pressure regulators, this was far far from accurate. I just need to make an appropriate fitting so as to plumb in my calibrated guage.

And to top this all off, there may be too much oil in the oil tank, it looks like my oldest son may have tried to help out but wasn't aware of the specifics of Ferrari dry sump systems (I will check in with him when he is back in town (currently on army drployment)).

So, there you have it, a big step forward.

Now that it seems to be running sweetly it is time to drop the engine and do belts and other items. I wanted to get in running properly before removing the engine for major service, rather than do the belt etc and then find it wouldn't start or run after the major service.

I will let you know how it progresses as it gets closer to being back on the road.