924Board.org

924er · Posted: Sat May 10, 2008 7:09 pm Post subject: Sudden loss of power

So I got all the vacuum lines properly connected as well as the timming done after the engine rebuild and i notice sometimes the car would just loose power then come back then lose power again and its wierd, its like 3 out of 4 cylinders are firing so im guessing no spark. the spark plug wire recently changed because i had this problem before and it was a bad wires or dist, rotor. these wires still look good, i mean it does get pretty hot in there with the wires just carelessly hanging there. has anyone ever had this problem before?? what else could this problem be????

this was one of the reasons my car didnt pass smog emissionss because it was too weak for the dyno to read it so the guy didnt know what to tell me haha

but thanks for the help...
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80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy

Ozzie · Posted: Sat May 10, 2008 8:40 pm Post subject:

Fuel filter blocked?
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

Paul · Posted: Sat May 10, 2008 9:02 pm Post subject:

What spark plug wires are you using?

Is your distributor cap/wires hitting the hood?
_________________
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.

924RACR · Posted: Sat May 10, 2008 10:47 pm Post subject:

Spark plug wire condition has nothing to do with their appearance...
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

924er · Posted: Sun May 11, 2008 3:06 am Post subject:

Fuel filter is new,

924er · Posted: Sun May 11, 2008 5:14 am Post subject:

Fuel filter is new,

Paul · Posted: Sun May 11, 2008 8:12 am Post subject:

Use only THESE unless you like replacing them. Some places guarantee this set for the life of the car. This set has the proper heat shielding.
_________________
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.

924er · Posted: Sun May 11, 2008 3:14 pm Post subject:

yeah i bet those are better since its brand name, ill place an order but ill wait a couple of days because it hasnt been losing power today although i did not drive it until the engine got too warmed up because that is when it usually loses power so ill see what happens and let you know thanks paul
_________________
80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy

Paul · Posted: Sun May 11, 2008 10:41 pm Post subject:

Tell me more about this statement:

"this was one of the reasons my car didnt pass smog emissionss because it was too weak for the dyno to read it so the guy didnt know what to tell me."
_________________
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.

924er · Posted: Mon May 12, 2008 4:35 am Post subject:

i dont know for some reason when the tech at the smog shop would throw it in 2nd gear it would nearly stall because their is not enough power to roll the dyno basically because one of the cylinders are not working. i did not know that at the time so the tech was confused and played with a few things, used his timming light but didnt know whats wrong, until i drove it home and realized the problem. it actually helped pushing the wires in because i found one of them kind of loose and that fixed the problem for now. i havent drove it too much but so far so good, if the car looses power again like that i will probably buy the bosch wires/cap/rotor/plugs
_________________
80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy

924er · Posted: Mon May 12, 2008 9:02 am Post subject:

ok well i took the car for a long spin and after a while i lost most of the power until i went home. so im guessing the cheap aftermarket wires i have cant resist heat no more, so i purchased the bosch brand..free shipping

Is it possible it could be something else other then the wires?

thanks....
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80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy

Smoothie · Posted: Mon May 12, 2008 9:15 am Post subject:

Some possibility of a bad coil, though I haven't heard of it happening with a 924. An old '74 Dodge van I once had would run worse after it heated-up - the problem turned out to be a bad coil in that case.
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

924RACR · Posted: Mon May 12, 2008 10:59 pm Post subject:

Seems like an obvious thing to put new plugs in there with the wires... but get good ones, Bosch or NGK (yes IMO they are good) - but not Champion, Delco, or other domestic junk... or Splitfires or other gimmick ones either...
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

924er · Posted: Tue May 13, 2008 10:47 am Post subject:

yep i ordered bosch but thanks for all the help ill let you know if that fixed my problem, because it only occurs when the engine is warmed up
_________________
80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy

924er · Posted: Thu May 15, 2008 9:49 am Post subject:

ok so i got the wires in the mail today, installed them already and came back from a nice long driver, the car sustained full power the whole way, the idle is nice too, everything is fine... thanks for all the help guys!

now lets just wait for the next problem to come

_________________
80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy