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Gatornapper
Joined: 23 Oct 2021 Posts: 294 Location: VA
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Posted: Mon Dec 27, 2021 11:42 am Post subject: Starts like new. Won't run more than 3 seconds....... |
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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 _________________ '87 944 S, looks & runs like new - sold my sweet 931; '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: 2596 Location: MI
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Posted: Mon Dec 27, 2021 4:29 pm Post subject: |
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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 Turbo - Slightly Modified |
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Gatornapper
Joined: 23 Oct 2021 Posts: 294 Location: VA
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Posted: Mon Dec 27, 2021 11:26 pm Post subject: |
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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 |
_________________ '87 944 S, looks & runs like new - sold my sweet 931; '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: 294 Location: VA
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Posted: Tue Dec 28, 2021 1:02 am Post subject: |
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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 |
_________________ '87 944 S, looks & runs like new - sold my sweet 931; '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
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Gatornapper
Joined: 23 Oct 2021 Posts: 294 Location: VA
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Posted: Wed Dec 29, 2021 10:07 am Post subject: |
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Joe - THANK YOU so much! SEE MY NEXT POST! NO NEED!
GN
_________________ '87 944 S, looks & runs like new - sold my sweet 931; '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: 294 Location: VA
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Posted: Wed Dec 29, 2021 10:29 am Post subject: BIGGEST & MOST WONDERFUL SURPRISE OF MY LIFE!?!? |
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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 _________________ '87 944 S, looks & runs like new - sold my sweet 931; '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: 1353 Location: Washington DC area
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Posted: Wed Dec 29, 2021 11:29 am Post subject: |
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Congrats! Sounds like fresh fuel cleaned up your injection system. _________________ 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: 294 Location: VA
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Posted: Wed Dec 29, 2021 12:55 pm Post subject: |
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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. |
_________________ '87 944 S, looks & runs like new - sold my sweet 931; '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: 8794 Location: Royal Oak, MI, USA
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Posted: Wed Dec 29, 2021 10:17 pm Post subject: |
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Yay!! Perseverance pays off...
Good work. _________________ Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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peterld
Joined: 10 Dec 2006 Posts: 946 Location: Noosa Heads QLD Australia
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Posted: Fri Dec 31, 2021 12:18 am Post subject: |
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Well done.
Those new tyres and shocks may answer your heavy steering issue! _________________ 80/81 932/8 ROW |
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jacobroufa
Joined: 18 Nov 2016 Posts: 529 Location: Belvidere, IL
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Posted: Fri Dec 31, 2021 12:33 am Post subject: |
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: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. _________________ 1980 Porsche 931
1981 Porsche 924 Weissach |
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Gatornapper
Joined: 23 Oct 2021 Posts: 294 Location: VA
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Posted: Tue Apr 26, 2022 10:45 am Post subject: |
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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. |
_________________ '87 944 S, looks & runs like new - sold my sweet 931; '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: 1353 Location: Washington DC area
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Posted: Wed Apr 27, 2022 7:01 am Post subject: |
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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: 294 Location: VA
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Posted: Mon May 09, 2022 8:54 pm Post subject: |
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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. |
_________________ '87 944 S, looks & runs like new - sold my sweet 931; '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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