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cubsbearsfan1963 · Posted: Thu Dec 01, 2011 9:19 am Post subject: 1982 924....WHEN HOT SURGES

Hi Gang.
Just got my first 924.
1982 model.
Car runs outstanding cold, smooth idle and runs outstanding until very hot. like half hour or so or longer. Then the following occurs:
When you take off in 1st it surges like its going to die until it gets up past a few grand rpm...then its fine.
If it dies, which it will usually do. It restarts immediately RE-STARTING IS NOT A PROBLE . At idle its fine. When u set out it runs rough to the point of either stalling or if you can get it up past a few grand rpm it will run ok. There is some slight back firing as well during these issues.
I replaced the WUR and nothing happened.
It runs so well cold and even warm that im afraid to dig any deeper without some useful ideas????
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2001 BMW 330cic
1979 BMW 733i
1976 Corvette
1980 Porsche 928
1982 Porsche 924

Ozzie · Posted: Thu Dec 01, 2011 10:09 am Post subject:

air/fuel mix?
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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

cubsbearsfan1963 · Posted: Sun Dec 04, 2011 9:55 am Post subject:

Anyone have anything?....
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2001 BMW 330cic
1979 BMW 733i
1976 Corvette
1980 Porsche 928
1982 Porsche 924

Lizard · Posted: Sun Dec 04, 2011 1:47 pm Post subject:

Take the car to a shop who understands K-jetronic (CIS) and have them set the base CO level and then report back.
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3 928s,

924RACR · Posted: Sun Dec 04, 2011 11:42 pm Post subject:

Actually, if it takes that long for a problem to show up, I'm going to guess that it's probably not mixture. I'd actually wonder if perhaps an electrical component is heat-soaking - which makes more sense to me given the time required to induce failure - and this is hurting the running condition.

That in mind, I'd be thinking about checking/replacing on the ignition side... what hasn't been replaced there? In particular the ign. coil, or perhaps coil wiring in poor condition.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype