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Starts like new. Won't run more than 3 seconds.......

 
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Gatornapper  



Joined: 23 Oct 2021
Posts: 254
Location: VA

PostPosted: Mon Dec 27, 2021 11:42 am    Post subject: Starts like new. Won't run more than 3 seconds....... Reply with quote

Ok, to see where I am w/new injectors, fuel pump, completely flushed system, maybe see my latest posts here:

http://924board.org/viewtopic.php?t=45322&start=75&sid=85868d3d40f8a0717d2d3fe18d451d2a

Engine starts instantly, smoothly, revs fine - for a few seconds. Then quits. By the way the engine readily starts and runs smoothly for a few seconds, I can tell ignition is fine, as is much of CIS.

To check FPR (to make sure it's getting signal from ignition), I bypassed it with a jumper & switch - same one I used to flush whole fuel system. Almost same results, only now engine wants to try to keep running, catches itself as it dies, revs a bit, then starts to die again, repeat.....until it dies.

I know vacuum lines and hoses are critical, and as far as I can determine, all are in unusually good condition and look fine. I've read and studied Vaughan's great "How to resusitage a long dead Turbo" here:

http://924board.org/viewtopic.php?t=22724&sid=85868d3d40f8a0717d2d3fe18d451d2a

Hoping the 924 Brain Trust here will know immediately what the problem is.

The good news is how readily the engine starts every try, and does run nicely for a few seconds.

As always, TIA,

GN
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'80 924 Turbo, 58k miles, great condition, being restored; '76 914 2.0 mostly restored; 2011 Porsche Cayman S in Meteor Grey, 3.4L, Softronics ECU tune 355+hp , PDK w/Sport Chrono. Got this thing for Porsche's.......
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2496
Location: MI

PostPosted: Mon Dec 27, 2021 4:29 pm    Post subject: Reply with quote

Maybe try cleaning the fuel pressure regulator plunger in the fuel distributor..

Watch the fuel pressure as it starts and dies if you can by running it with a CIS test gauge and leaving the valve open..


Your exhaust isn’t plugged by a family of squirrels is it?


Idk really
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Gatornapper  



Joined: 23 Oct 2021
Posts: 254
Location: VA

PostPosted: Mon Dec 27, 2021 11:26 pm    Post subject: Reply with quote

Eddie -

Thanks. Engine sounds and runs too good for there to be any exhaust issues.

May take a while to assemble the gauge and testing lines:

http://cis911primer.com/pages/test_pressures.html

Know of a link on detailed instructions on how to clean plunger in fuel distributor? It's real sensitive from what I've read....like to know what I'm getting into before I do it........

GN

Fasteddie313 wrote:
Maybe try cleaning the fuel pressure regulator plunger in the fuel distributor..

Watch the fuel pressure as it starts and dies if you can by running it with a CIS test gauge and leaving the valve open..


Your exhaust isn’t plugged by a family of squirrels is it?


Idk really

_________________
'80 924 Turbo, 58k miles, great condition, being restored; '76 914 2.0 mostly restored; 2011 Porsche Cayman S in Meteor Grey, 3.4L, Softronics ECU tune 355+hp , PDK w/Sport Chrono. Got this thing for Porsche's.......
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Gatornapper  



Joined: 23 Oct 2021
Posts: 254
Location: VA

PostPosted: Tue Dec 28, 2021 1:02 am    Post subject: Reply with quote

100 psi pressure gauges I have.

Metric fittings I don't have, and don't know where to get them.

Then, I can't find anything to tell me where to connect the gauge........

GN


Fasteddie313 wrote:
Maybe try cleaning the fuel pressure regulator plunger in the fuel distributor..

Watch the fuel pressure as it starts and dies if you can by running it with a CIS test gauge and leaving the valve open..


Your exhaust isn’t plugged by a family of squirrels is it?


Idk really

_________________
'80 924 Turbo, 58k miles, great condition, being restored; '76 914 2.0 mostly restored; 2011 Porsche Cayman S in Meteor Grey, 3.4L, Softronics ECU tune 355+hp , PDK w/Sport Chrono. Got this thing for Porsche's.......
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joemoma1990  



Joined: 29 Jun 2021
Posts: 32
Location: Apple Valley, MN

PostPosted: Wed Dec 29, 2021 4:11 am    Post subject: Reply with quote

Buy this on Amazon, has all the connectors you need.

https://www.amazon.com/BETOOLL-Injection-Pressure-Tester-Gauge/dp/B01L17TPT2/ref=sr_1_2?crid=WAZFUI1DZ3Y2&keywords=BETOOLL+Pro+Fuel+Injection+Pressure+Tester+Kit+Gauge+0-140+PSI&qid=1640714981&s=automotive&sprefix=betooll+pro+fuel+injection+pressure+tester+kit+gauge+0-140+psi+%2Cautomotive%2C197&sr=1-2

Then go here, the guy is testing his CIS pressure with the same gauge shows exactly how to test it.

https://youtu.be/gtAX08PICnc

Hope this helps.
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Gatornapper  



Joined: 23 Oct 2021
Posts: 254
Location: VA

PostPosted: Wed Dec 29, 2021 10:07 am    Post subject: Reply with quote

Joe - THANK YOU so much! SEE MY NEXT POST! NO NEED!

GN

joemoma1990 wrote:
Buy this on Amazon, has all the connectors you need.

https://www.amazon.com/BETOOLL-Injection-Pressure-Tester-Gauge/dp/B01L17TPT2/ref=sr_1_2?crid=WAZFUI1DZ3Y2&keywords=BETOOLL+Pro+Fuel+Injection+Pressure+Tester+Kit+Gauge+0-140+PSI&qid=1640714981&s=automotive&sprefix=betooll+pro+fuel+injection+pressure+tester+kit+gauge+0-140+psi+%2Cautomotive%2C197&sr=1-2

Then go here, the guy is testing his CIS pressure with the same gauge shows exactly how to test it.

https://youtu.be/gtAX08PICnc

Hope this helps.

_________________
'80 924 Turbo, 58k miles, great condition, being restored; '76 914 2.0 mostly restored; 2011 Porsche Cayman S in Meteor Grey, 3.4L, Softronics ECU tune 355+hp , PDK w/Sport Chrono. Got this thing for Porsche's.......
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Gatornapper  



Joined: 23 Oct 2021
Posts: 254
Location: VA

PostPosted: Wed Dec 29, 2021 10:29 am    Post subject: BIGGEST & MOST WONDERFUL SURPRISE OF MY LIFE!?!? Reply with quote

JUST MAY BE!

Friday through Sunday 931 would start but not run for more than a few seconds. Yesterday it would not start at all. Put my frustration level at a 12 on a 10-pt. scale.

Today about noon I double-checked some things, and thought, well, might as well try one more time.

Not only did the engine start immediately, I was able - barely - to keep it limping along pumping the accel pedal furiously. I thought, oh! If I could just keep it running! Well, I did. Or it did. BARELY running, missing like crazy, revs up, almost to zero, up, zero and so on.

BUT I KEPT IT RUNNING FOR 3 or 4 minutes and SHAZAM!!! all of a sudden the engine hits some smooth spots! Intermittent, but very noticeable and significant! So I just kept it running....and all of a sudden, after 5 to 7 minutes the engine begins running smoothly as I keep it about 2,000 RPM.

Surely if I let it drop to idle, it will die. NO! I let it drop to idle and the engine PURRS!

THE LONGER I RAN IT, THE BETTER IT RAN! But I figured what it needs now is 2 cans of Seafoam. Do I dare take it on road??????? Why not?

I called my insurance company, added the car, threw an Antique tag on the back and called my Porsche friend Rick who came right over. (Rick found the 931 for me, a Porsche genius, has 356 replica, Concours '72 914, almost like-new '85 944 and '04 911.)

Totally amazed, we drove out on the highway with the engine running like new! So we put it through its paces, and it is running flawlessly! EVERYTHING IS WORKING! Temp stayed perfect, fans working. I had already gotten all the lights working. Tranny and suspension are great! Car is TIGHT!!! It's almost like a new car - other than the hatch rattle in the back.

So Rick and I spent a good 30-40 minutes thrashing the 931, and it is doing all things well! Well, the steering is quite an effort as I'm used to my 914. But the Turbo kicks in nicely, smoothly, and sweetly adds its power!

From a long history of working on cars, trucks, motorcycles, I thought it would be months before I'd get the 931 to where it is today.

I consider it a miracle.

Now just can't wait to see what some new tires and Bilsteins will do for the car!

I could not be a happier 931 owner!

GN
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'80 924 Turbo, 58k miles, great condition, being restored; '76 914 2.0 mostly restored; 2011 Porsche Cayman S in Meteor Grey, 3.4L, Softronics ECU tune 355+hp , PDK w/Sport Chrono. Got this thing for Porsche's.......
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1266
Location: Washington DC area

PostPosted: Wed Dec 29, 2021 11:29 am    Post subject: Reply with quote

Congrats! Sounds like fresh fuel cleaned up your injection system.
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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
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Gatornapper  



Joined: 23 Oct 2021
Posts: 254
Location: VA

PostPosted: Wed Dec 29, 2021 12:55 pm    Post subject: Reply with quote

THANKS! No one is happier than ME!

Lots of flushing and NEW fuel injectors......they could not be cleaned or salvaged........

GN

Fifty50Plus wrote:
Congrats! Sounds like fresh fuel cleaned up your injection system.

_________________
'80 924 Turbo, 58k miles, great condition, being restored; '76 914 2.0 mostly restored; 2011 Porsche Cayman S in Meteor Grey, 3.4L, Softronics ECU tune 355+hp , PDK w/Sport Chrono. Got this thing for Porsche's.......
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924RACR  



Joined: 29 Jul 2001
Posts: 8605
Location: Royal Oak, MI, USA

PostPosted: Wed Dec 29, 2021 10:17 pm    Post subject: Reply with quote

Yay!! Perseverance pays off...

Good work.
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'82 931 Plat. Silver
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peterld  



Joined: 10 Dec 2006
Posts: 904
Location: Noosa Heads QLD Australia

PostPosted: Fri Dec 31, 2021 12:18 am    Post subject: Reply with quote

Well done.
Those new tyres and shocks may answer your heavy steering issue!
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jacobroufa  



Joined: 18 Nov 2016
Posts: 437
Location: Rockford, IL

PostPosted: Fri Dec 31, 2021 12:33 am    Post subject: Reply with quote

:applause: Well done GN!

You said "seafoam" I noticed. Good stuff; I use it myself. In these cars, the fuel additive of choice (obviously seafoam has many uses otherwise) is Chevron's Techron.. Something about the CIS fuel injection really loves the stuff. Handy to keep a couple bottles around.
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1981 Porsche 924 Weissach
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Gatornapper  



Joined: 23 Oct 2021
Posts: 254
Location: VA

PostPosted: Tue Apr 26, 2022 10:45 am    Post subject: Reply with quote

Thanks! Others have recommended Techron as well - switching as soon as I use up all my bottles of Seafoam.....

jacobroufa wrote:
:applause: Well done GN!

You said "seafoam" I noticed. Good stuff; I use it myself. In these cars, the fuel additive of choice (obviously seafoam has many uses otherwise) is Chevron's Techron.. Something about the CIS fuel injection really loves the stuff. Handy to keep a couple bottles around.

_________________
'80 924 Turbo, 58k miles, great condition, being restored; '76 914 2.0 mostly restored; 2011 Porsche Cayman S in Meteor Grey, 3.4L, Softronics ECU tune 355+hp , PDK w/Sport Chrono. Got this thing for Porsche's.......
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1266
Location: Washington DC area

PostPosted: Wed Apr 27, 2022 7:01 am    Post subject: Reply with quote

I use 44K which is probably like Techron and is what all the shops pour in your gas tank to clean the injectors and such. Kind of like tune-up-in-a-can for which the shops charge several hundred dollars. But it does work. I use it full strength to clean clogged Porsche 911 MFI injectors.
_________________
1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
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Gatornapper  



Joined: 23 Oct 2021
Posts: 254
Location: VA

PostPosted: Mon May 09, 2022 8:54 pm    Post subject: Reply with quote

Thanks Chuck.

Fifty50Plus wrote:
I use 44K which is probably like Techron and is what all the shops pour in your gas tank to clean the injectors and such. Kind of like tune-up-in-a-can for which the shops charge several hundred dollars. But it does work. I use it full strength to clean clogged Porsche 911 MFI injectors.

_________________
'80 924 Turbo, 58k miles, great condition, being restored; '76 914 2.0 mostly restored; 2011 Porsche Cayman S in Meteor Grey, 3.4L, Softronics ECU tune 355+hp , PDK w/Sport Chrono. Got this thing for Porsche's.......
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