Modified 3.3 L turbo Not starting

Mitchells · 04:34 AM

I inherited a heavily modified Porsche That after spending a good amount of money getting it running After it sitting in storage for years has recently stopped. Car was running excellent and then started running rough and died the mechanic that did the work on it to get it running told me he was sure it was the rear pump so I installed a new rear pump now it wants to crank it but will not start. Any help would be greatly appreciated as I'm having very mixed feeling about the car and just want to get it back up and running.

Thanks again
Mike

speednme1 · 07-14-2014, 05:59 AM

Mike more info is needed. Does it crank? Did you check your battery? Is the starter new or the original one? Did you check for any vacuum leaks! So many variables...but it also could be something very simple...oh and what mods are on the car?

Mitchells · 07-14-2014, 06:27 AM

New battery, starters good, no vacuum leaks, it does crank but will not catch. I did find a loose fuse in the fuse box took care of that now found that I do have a leak at the new rear pump fixing that right now.

As for the modifications to the car, I do not know all of the details as I was very young when this car came to be But it started as a 3.3 turbo Ported polished, group B cams, twin intercooled a good amount of custom/one off parts, Adjustable boost control up to 2.0 bars, The car has a very interesting history. Makes north of 600 hp. Once I get it going again I think I'm going to end up selling it.

T77911S · 07-14-2014, 06:59 AM

first thing is to check for spark. pull a plug wire and put a sparkplug on it and ground it. crank it and check for spark. you could also use a timing light on one of the wires while cranking.

make sure both pumps run.
reach around behind the air flow meter (AFM) on the left side. there is a plug in the back near the top, remove it and turn the key on. check that both run. just leave this off for now if you want to.

while th ekey is on, press down on the mixture adjusting rod, (or remove the air cleaner and push down on the sensor plate), to out some fuel into the engine, then crank again. the plate should be hard to push down.

make sure you do not have any air leaks. if the IC's are not bolted down good they can blow off.

more to come if this does not work.

speednme1 · 07-14-2014, 07:00 AM

Post pics when you get a chance also check out this sticky http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/547032-sticky-common-answers-why-my-car-doesnt-start.html

turbobrat930 · 07-14-2014, 07:17 AM

Just a hunch, but I think that your "no start" condition is going to be fuel related. Sitting for that long, the fuel system is sure to be gummed up.

Mitchells · 07-14-2014, 08:24 AM

Fuels system has been went through ( new tank, lines, relays, pumps, injectors)

mark houghton · 07-14-2014, 10:49 AM

Quote:

Originally Posted by T77911S

make sure both pumps run.
reach around behind the air flow meter (AFM) on the left side. there is a plug in the back near the top, remove it and turn the key on. check that both run. just leave this off for now if you want to.

while th ekey is on, press down on the mixture adjusting rod, (or remove the air cleaner and push down on the sensor plate), to out some fuel into the engine, then crank again. the plate should be hard to push down..

All of this is assuming it's a CIS fueled car, and hasn't been converted to electronic fuel injection. At 600hp, I bet it's no longer CIS.

Tippy · 07-14-2014, 10:54 AM

What brand of electronic fuel injection does it have?

Mitchells · 07-14-2014, 01:00 PM

I have to apologize, I will try to answer the best I can, I'm a porsche newbie.

I believe it has a Bosch motronic

Mitchells · 07-14-2014, 01:02 PM

Here's one of the engine

Mitchells · 07-14-2014, 01:04 PM

One more,

I had to go pick up family at the air port so troubleshooting will have to wait until tomorrow

unclebilly · unclebilly's Garage

It is definately not cis. It is likely motronic.

It does have a carerra intake and the rest looks pretty custom.

Check your fuel pump relay. Make sure your fuel pumps work as suggested above. Check the fuses for your motronic system.

Rotate your fuses in their holders. Sometimes from sitting the euro fuse ends oxidize a bit and don't make electrical contact.

xbmwguy · xbmwguy's Garage

Mitchell. I noticed you are in fla. Which part? I will be back in town on wed and maybe give you a hand. I'm in west palm

lee88 · lee88's Garage

As an aside, interesting 959 bodywork to go with the engine mods.

Good luck getting your car sorted.

Mitchells · 07-15-2014, 03:14 AM

Quote:

Originally Posted by xbmwguy

Mitchell. I noticed you are in fla. Which part? I will be back in town on wed and maybe give you a hand. I'm in west palm

Thank you but I'm just out side of Orlando in Montverde.

I will go over the fuses again today and need to fix the leak on the new fuel pump as well. And go over some things again that were mentioned above.

What drives me nuts is it was running great I cam home parked it 3 days later cranked it up to idle for 5-7 mins, 3 days later did the same ( never moved it either time) them a couple of days after that I cranked it up and drove it 15ft out of the garage to take some pictures and this started :-( it's driving me nuts

I want to thank you all for your time and help so far I greatly appreciate it

Mike

krasuskyp · 07-15-2014, 04:31 AM

(this suggestion will make the Cookie Monster dude here have a coronary, but...) ^this gem of info^ is telling

try this:

turn car over with your foot to the floor, and as it turns, pump the hell out of the pedal vigorously

report back

how about some more about the interesting history, interior pics, etc?

agreed, interesting 959 conversion...

onboost · 07-15-2014, 06:00 AM

I understand that you have changed out a number of fuses and relays.. but as most have said, it sounds fuel related.

If the car is still running the Bosch Motronic system, was the DME relay replaced? If not, do so.. if so then check to ensure it is properly seated. It is the black relay next to the Motronic box under the drivers seat..

Also, after turning the car over a couple of times, you can check to see if the fuel is reaching the injectors by cracking the nut loose on the end of the fuel rail.. it should weep or give a pressurized spritz depending upon how quickly you open it.

Tippy · 07-15-2014, 09:27 AM

Quote:

I have to apologize, I will try to answer the best I can, I'm a porsche newbie.

I believe it has a Bosch motronic

"Ischmitz" can test out your unit if it's the problem.

Mitchells · 07-18-2014, 09:35 AM

Sorry for the delay, work and visiting family has consumed the week.

Fuel is reaching the fuel rails, I have a spark at the plugs, I don't have a DME relay anywhere and the motronic is under the pass seat.

I tried cranking it with the gas pedal down with no change.

I'm about ready to give up and sell it as is :-(