Show full size 924Board.org
Discussion Forum of 924.org
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 Technical FAQ924 FAQ (Technical)   Technical924 Technical Section   Jump to 924.org924.org   Jump to PCA 924 Registry924 Registry

Spark Misfire? ANY advice please!!!
Goto page Previous  1, 2, 3  Next
 
Post new topic   Reply to topic    924Board.org Forum Index -> General Discussions
View previous topic :: View next topic  
Author Message
Paul  



Joined: 02 Nov 2002
Posts: 9459
Location: Southeast Wisconsin

PostPosted: Fri Aug 24, 2012 10:32 am    Post subject: Reply with quote


_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.
Back to top
View user's profile Send private message Send e-mail
tylercle  



Joined: 17 Aug 2012
Posts: 27
Location: Denton

PostPosted: Fri Aug 24, 2012 10:41 am    Post subject: Reply with quote

Yeah I know where that one is...on a 77.5 924, I'm looking for the other marker that is found by the oil pump(?). It's a line with the letter OT or something
_________________
'77 924 "Penelope Cruz" all stock n/a, 70K.

"...actually, ambition won't get you that far. You'll shift gears. You'll see something that's shinier. But if you believe... then you're the long-distance runner." - Sam Abell
Back to top
View user's profile Send private message Visit poster's website
fiat22turbo  



Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR

PostPosted: Fri Aug 24, 2012 10:47 am    Post subject: Reply with quote

I believe it should be a notch in the edge of the pulley that drives the water pump/alternator.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)
Back to top
View user's profile Send private message Visit poster's website
Paul  



Joined: 02 Nov 2002
Posts: 9459
Location: Southeast Wisconsin

PostPosted: Fri Aug 24, 2012 11:06 am    Post subject: Reply with quote



Better to use the ones under the brake booster...
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.
Back to top
View user's profile Send private message Send e-mail
Paul  



Joined: 02 Nov 2002
Posts: 9459
Location: Southeast Wisconsin

PostPosted: Fri Aug 24, 2012 11:15 am    Post subject: Reply with quote


_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.
Back to top
View user's profile Send private message Send e-mail
tylercle  



Joined: 17 Aug 2012
Posts: 27
Location: Denton

PostPosted: Fri Aug 24, 2012 2:22 pm    Post subject: Reply with quote

Excellent! Thanks. Time to revive Penelope Cruz.
_________________
'77 924 "Penelope Cruz" all stock n/a, 70K.

"...actually, ambition won't get you that far. You'll shift gears. You'll see something that's shinier. But if you believe... then you're the long-distance runner." - Sam Abell
Back to top
View user's profile Send private message Visit poster's website
tylercle  



Joined: 17 Aug 2012
Posts: 27
Location: Denton

PostPosted: Fri Aug 24, 2012 2:44 pm    Post subject: Reply with quote

The other one I'm looking for is this one, but where is "this one" exactly??
_________________
'77 924 "Penelope Cruz" all stock n/a, 70K.

"...actually, ambition won't get you that far. You'll shift gears. You'll see something that's shinier. But if you believe... then you're the long-distance runner." - Sam Abell
Back to top
View user's profile Send private message Visit poster's website
!tom  



Joined: 28 Aug 2006
Posts: 1907
Location: Victoria, BC Canada

PostPosted: Fri Aug 24, 2012 3:59 pm    Post subject: Reply with quote

The correct mark to look for is on the flywheel. There's a little hole in the bellhousing that is there for you to look at the timing mark on the flywheel.

As mentioned above, it's below the brake booster on the bell housing.

The problem with this though is that often people who work on these cars before we buy them are clueless, and put the flywheels back on in the wrong orientation, so the timing mark is useless. As the front pulley is keyed, it's impossible to put that back together wrong.

Given that cam timing is adjustable only in increments of teeth, the oil pump mark will get you close enough. If your flywheel is still on properly, then that's another good mark to use.
_________________
78 924 NA
5-lug
Back to top
View user's profile Send private message Visit poster's website
tylercle  



Joined: 17 Aug 2012
Posts: 27
Location: Denton

PostPosted: Sat Aug 25, 2012 11:37 am    Post subject: tdc Reply with quote

Strangely enough, after correcting the oil pump crank to TDC in-line with the cam flywheel and rotor, the car refused to start and upon rechecking TDC, noticed the crank has moved a few teeth (!?). Corrected TDC and again the crank gets off (see photo). Is this common?

And my thinking is that since the car started prior to correction, albeit poorly, I'm assuming spark, air and fuel should not be issues. These components worked before recent fiddling.

After correcting TDC, symptoms of turning the key are 1)car turns over but does not start 2) there is a chugging feel


_________________
'77 924 "Penelope Cruz" all stock n/a, 70K.

"...actually, ambition won't get you that far. You'll shift gears. You'll see something that's shinier. But if you believe... then you're the long-distance runner." - Sam Abell
Back to top
View user's profile Send private message Visit poster's website
Paul  



Joined: 02 Nov 2002
Posts: 9459
Location: Southeast Wisconsin

PostPosted: Sat Aug 25, 2012 12:09 pm    Post subject: Reply with quote

With the pointer on the back side dot on the cam gear (like the picture above), post a couple of pictures of the front of the cam gear. Also verify that the number one plug wire is above the rotor.

Did you take the engine pulley off at any time during this adventure? If so did you reinstall the key?
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.
Back to top
View user's profile Send private message Send e-mail
tylercle  



Joined: 17 Aug 2012
Posts: 27
Location: Denton

PostPosted: Sun Aug 26, 2012 6:36 am    Post subject: Reply with quote



Didn't take off the flywheel, only the cam cover. Plug#1 is directly above the rotor, with all plugs set correctly.

Not sure if having TDC off by a few teeth (cam and crank aren't perfect) should prevent the car from starting all together...

After turning the key to start the first time, there is a chug followed by what feels like a building of pressure that stops the car from chugging further, and I quickly remove the key...
_________________
'77 924 "Penelope Cruz" all stock n/a, 70K.

"...actually, ambition won't get you that far. You'll shift gears. You'll see something that's shinier. But if you believe... then you're the long-distance runner." - Sam Abell
Back to top
View user's profile Send private message Visit poster's website
tylercle  



Joined: 17 Aug 2012
Posts: 27
Location: Denton

PostPosted: Sun Aug 26, 2012 8:57 am    Post subject: Reply with quote

Update! Found the marker inside the clutch housing. Turns out my crank flywheel marker wasn't the right one. Upon aligning the cam, car actually starts with low idle again, and the timing gets off a few teeth after running. I'm going to rotate the cam flywheel 360 degrees after re-aligning to make sure it's on the right stroke.
_________________
'77 924 "Penelope Cruz" all stock n/a, 70K.

"...actually, ambition won't get you that far. You'll shift gears. You'll see something that's shinier. But if you believe... then you're the long-distance runner." - Sam Abell
Back to top
View user's profile Send private message Visit poster's website
tylercle  



Joined: 17 Aug 2012
Posts: 27
Location: Denton

PostPosted: Sun Aug 26, 2012 9:12 am    Post subject: Reply with quote

and no change except she started quicker.
_________________
'77 924 "Penelope Cruz" all stock n/a, 70K.

"...actually, ambition won't get you that far. You'll shift gears. You'll see something that's shinier. But if you believe... then you're the long-distance runner." - Sam Abell
Back to top
View user's profile Send private message Visit poster's website
tylercle  



Joined: 17 Aug 2012
Posts: 27
Location: Denton

PostPosted: Sun Aug 26, 2012 9:22 am    Post subject: Reply with quote

Should I try adjusting the idle or is that a symptom of off timing?
_________________
'77 924 "Penelope Cruz" all stock n/a, 70K.

"...actually, ambition won't get you that far. You'll shift gears. You'll see something that's shinier. But if you believe... then you're the long-distance runner." - Sam Abell
Back to top
View user's profile Send private message Visit poster's website
Paul  



Joined: 02 Nov 2002
Posts: 9459
Location: Southeast Wisconsin

PostPosted: Sun Aug 26, 2012 11:15 pm    Post subject: Reply with quote

Have you set the ignition timing with a timing light yet?
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    924Board.org Forum Index -> General Discussions All times are GMT + 11 Hours
Goto page Previous  1, 2, 3  Next
Page 2 of 3

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group