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Nobbi
Joined: 24 Aug 2006
Posts: 1396
Location: Germany
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 Posted: Thu Sep 11, 2008 2:55 am Post subject: Running on 3 cyl. again..... |
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Hello ,
the problem i have seems to be fixed for a while but now it is coming back.
When i start the engine (cold) it is running on 3 cyl.until it warms up!?
Take about 2 miles or so until it runs smoothly...
What is the cause and did you exp. it also ...!??
Thanks, Nobbi  
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NA 924 - april/1977- 4-speed-audi gearbox.
500.000 km with fun.....and new toy:Porsche 944 S2 Cabriolet.Other car Daimler c-class cabby,brandnew..Plus : DEUTZ 4005 tractor Built 1967 |
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Chrenan
Joined: 15 Jan 2003
Posts: 3903
Location: Canada
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| Posted: Thu Sep 11, 2008 3:16 am Post subject: |
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What do the plugs look like? Is one fouling? How new is the WUR?
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1987 951 - M193 Version for Japan |
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Mahatma Gadhni
Joined: 08 Mar 2008
Posts: 162
Location: Croatia
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| Posted: Thu Sep 11, 2008 4:09 am Post subject: |
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This happens to me too, but only when engine stands still for a week or two. I took a plug once off that cylinder and it was wet. I've changed the plug but the problem is still there.
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1984 924 2.0 NA |
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Chrenan
Joined: 15 Jan 2003
Posts: 3903
Location: Canada
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| Posted: Thu Sep 11, 2008 4:12 am Post subject: |
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Have you checked the spray pattern from all injectors? Is one overspraying/underspraying or leaking after shut-down?
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1987 951 - M193 Version for Japan |
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sgloki
Joined: 23 Aug 2008
Posts: 53
Location: Bellingham, WA
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| Posted: Thu Sep 11, 2008 5:12 am Post subject: |
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This is typical VW behavior.
First be sure your injectors are clean, plugs are clean, and you are getting proper spark as suggested above. Check your control pressure regulator for proper operation...EDIT: oh yeah... CPR also known as a WUR (warmup regulator)
Or skip all those steps and put 92 octane in your car, it should cut the 2 minutes of missing down to about 30 seconds at idle. If it doesn't then go through your fuel and spark a bit. Save the headache for now, just try better fuel. Older 8v VW motors tend to knock and miss a little bit when cold with lower grade fuels.
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All work and no speeding makes jack a dull boy. |
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Raceboy
Joined: 01 Mar 2004
Posts: 2327
Location: Estonia, Europe
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| Posted: Thu Sep 11, 2008 6:00 am Post subject: |
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Is it wet from gasoline, oil or water? It can be failed headgasket (it happened to me once).
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
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Khal
Joined: 26 Sep 2003
Posts: 4872
Location: Sunny and lovely interior BC, Canada
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| Posted: Thu Sep 11, 2008 6:12 am Post subject: |
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| Raceboy wrote: | | It can be failed headgasket (it happened to me once). |
Don't wanna start a panic but I second Raceboy's suggestion. A blown headgasket can certainly cause those symptoms. Had a similar set of symptoms when mine went.
Still, I defer to the greater knowledge of the gurus here.
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Mahatma Gadhni
Joined: 08 Mar 2008
Posts: 162
Location: Croatia
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| Posted: Thu Sep 11, 2008 6:25 am Post subject: |
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I don't believe that the gasket is blown because I don't see coolant and oil mixing.
To be honest, I haven't really checked what causes the plug to be wet, but I'll definitely get to that once I start restoring the car 
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1984 924 2.0 NA |
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TMB-Racing
Joined: 13 Nov 2002
Posts: 160
Location: Tacoma,WA
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| Posted: Thu Sep 11, 2008 6:32 am Post subject: |
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You may not see oil in the water or vice versa with a blown head gasket or a huge loss of the mentioned fluids. I had the same problem- we thought it was a leaking injector after shutdown and turned out to be coolant (blown head gasket) the car would run great after it cleared its throat. Even if it is the head gasket- it really isn't that bad to do.
Andrew
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Khal
Joined: 26 Sep 2003
Posts: 4872
Location: Sunny and lovely interior BC, Canada
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| Posted: Thu Sep 11, 2008 6:37 am Post subject: |
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| TMB-Racing wrote: | You may not see oil in the water or vice versa with a blown head gasket or a huge loss of the mentioned fluids. I had the same problem- we thought it was a leaking injector after shutdown and turned out to be coolant (blown head gasket) the car would run great after it cleared its throat. Even if it is the head gasket- it really isn't that bad to do.
Andrew |
Agree again. My experience almost exactly.
From my earlier thread:
| Khal wrote: | But when I start her up this morning, she's missing again. This time it doesn't smooth out... 
I park her up and pop the hood. Everything looks tight. No leads loose or anything. I check the oil; Smooth and syrupy.
...after pulling all the plugs and giving them a quick clean, I put 'em back in and she starts up and idles perfectly. |
And the warning I got from Paul:
| Paul wrote: | | Sooner or later that coolant is going to get into the oil pan and cause more nasty things to happen. (spun bearings, trashed turbo) |
Again, don't wanna start a panic. Could be that's not your problem at all. But it's worth further investigation.
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Thu Sep 11, 2008 7:37 am Post subject: |
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Mine doesn't hit on all cylinders for 5-15 seconds. If you are losing coolant into the engine, the cylinder(s) where the HG is failing should show a shiny steam-cleaned spark plug.
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- WeiBe (1987 924S 2.5t) - 931 S3
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RC
Joined: 25 Mar 2007
Posts: 2637
Location: Australia
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| Posted: Thu Sep 11, 2008 8:42 am Post subject: |
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| Raceboy wrote: | | Is it wet from gasoline, oil or water? It can be failed headgasket (it happened to me once). |
Happened to me too, on #4. The large coolant holes at the rear had corroded and so had the metal sealing ring of the head gasket. Initially thought it was an injector or fuel problem.
Fairly easy to check. First morning pull off each plug lead in turn to find the one that doesn`t make any difference. That cylinder is the sus one. Then next morning pull out that plug or all of them. Good chance it will be wet and possibly cleaner than the rest. Slight seepage won`t contaminate the oil or coolant or even be noticeable with the engine warm. You will probably have a steamy exhaust till it warms up that you would put down to condensation.
This problem won`t fix itself and any crap in a can is useless. Its head gasket time at least and possibly some welding and machining too. |
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Raceboy
Joined: 01 Mar 2004
Posts: 2327
Location: Estonia, Europe
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| Posted: Thu Sep 11, 2008 12:50 pm Post subject: |
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Besides, changing headgasket on na is a walk in the park  Takes about 2-3 hours of labour but you'll need to resurface the head in a machine shop.
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Thu Sep 11, 2008 4:10 pm Post subject: |
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Hey Nobbi, check the fluids...if they are ok...you might want to consider....how are you starting it in the mornings..it could be a broken ring or a worn ring knowing your "morning start style". Never rev the engine when starting it.
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Raceboy
Joined: 01 Mar 2004
Posts: 2327
Location: Estonia, Europe
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| Posted: Fri Sep 12, 2008 2:14 am Post subject: |
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My car had ALL the fluids ok, still had failed headgasket also.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
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