924Board.org

[climburns]

ok...my baby runs....she cranks over real quick now.

the timing was fixed and is adjustable to tune to wat i desire.

my problem is that after about 3 minutes of running, the motor hits redline on the temp gauge and she overheats basicly unless i shut it off.

I bled the system from the air bubble in it and all of the coolant hoses are warm which tells me that coolant is flowing. thermostat is new and i believ the water pump is fairly new

could it be the water pump or radiator???

it could be either or but the car only has 68000ish miles on it and most of the stuff is newish....has anyone else had these problems on this 2.0???



she idles a little rough and i pulled the plugs and they were a little fouled but no major damage. i may have a vacuum leak somewhere but i dnt think it would affect my problem to this degree.

whenevr i step on the gas she actually loses rpms and goes to stall out.......why???

during my rebuild i let the injectors soak in a carb cleaner container and then dried them out and put them in.

wat could it be???


please help in anyway you can...i dont feel like buying alot of things that I dont need to when the car is perfectly fine....ideas and comments are much appreciated..thank you.
_________________
Chris

[Mike924]

I think your car has a number of minor problems, which you need to sort out one at a time.

The first (and worst) is the overheating. I'd suggest you remove the radiator and reverse flush it. You could also remove the thermostat and reverse flush the head. Johnathon1 on this board had his rad rodded out and found it completely sorted his cooling issues.

Once you've got the temperature under control you can start breaking down the remaining problems.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

[Khal]

[Rich H]

+1

The hoses would be far too hot to touch! Could you have a duff temp sender? Shut the engine off and dump the coolant pressure (Careful or you'll get scolded!) Pop the air lock bung above the thermostat and stick a thermometer in, see how hot the coolant really is.

My Elise needs a new sender every 6 months.... (Crappy Rover parts!)
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[Mike924]

[Rich H]

What he said.
The thermometer would tell you if its properly hot or just warm... Mind you the clouds of scalding steam would tell you that...
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[gohim]

First of all, what do you mean byyou got the timing where you want it?

The timing needs to be set where Porsche specifies. Are you sure that you indexed the timing belt correctly, adjusted the timing belt tension corectly, then torqued the tensioner bolt properly?

You can't do an accurate ignition timing set without the engine warm, with the mixture and idle speed set. If you can't run the engine that long how did you set the ignition timing? Did you even use a timing light with the engine idling at the right speed?

And did you set the ignition timing to factory spec using the correct marks?

What did you do for your rebuild? From the way that you have written, I
take it that you reused the old waterpump. Di you bother to check it to make sure that the impeller was intect, and spinning with the shaft, and it was not leaking?

What about the thermostat? Did you install it, and did you install it in the right orientation (is it upsidedown)?

Did the cooling fans turn on? Did they blow air in the right direction (people have connected the cooling fans so they blow in the wrong direction).

What about the headgasket? Did you install it? Supposedly there is a way to install it wrong, and some oil and water passages get blocked.

Have you checked the valve clearances if the head was off, since the head was reinstalled?

Have you checked the spray patterns of the fuel injectors?

[endwrench]

[joecitizennn]

Is it possible to try running it without the thermostat? I had a 924S that ran hot and I removed the thermostat, and the temp needle never moved from the cold mark. So I got a porsche-brand thermostat. End of problems. The thermostat that caused the problems was a brand new Napa unit. Just junk. The 924S needs a precise thermostat to maintain the right temp. I dont know much about the thermostats on pre-s 924 cars.
_________________
87 924s
88 924SE gone
447 hp cgt clone
87 924S gone
84 944 sold
83 944 sold
89 turbo S LSD, ABS etc
86 951 white rocket
85 944 sport everything.
84 944 sold.
87 944 sold

[gohim]

I have never seen an engine overheat in three minutes with a blown headgasket.

I suspect the problem could be something more like extreme ignition timing misadjustment, and/or incorrect valve clearance, and/or camshaft timing misadjustment.

[Ozzie]

maybe just a knackered sender or temp gauge
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[johnathan1]

Yea, I think the problem is more likely a bad sending unit/gauge...

Does the engine FEEL like its overheating? Also feel the radiator, it should be just a hot as the engine.
_________________
-1977 924, 4-Spd...Gone
-1987 Toyota Supra Turbo, Pearl White, BPU, 300RWHP @ 10psi.
-1989 Mercedes-Benz 300SEL

WARNING: MAY CONTAIN TRACES OF AUDI OR VW!

[climburns]

wowzers....thats alot of replies......

for one, the fan works, i bypassed it and hooked it to the battery
it spins the right way

for two, i mean that i can dvance the rpms or lower the rpms by adjusting my distributor, hence advancing the timing or retarding it

for three, it is definately not a blown head gasket...i rebuilt the motor by hand and for as long as ive been wrkin on cars i kno im not that stupid


i will try def. getting the radiator flushed, i thnk thats the best thing to do first and your right...if i solve the overheating problem then the rest is easy....



NEW PROBLEM.....

my cars intake manifold does get hot when it overheats..duh....besides that someone said that it was their EGR valve....

my egr valve is connected to the manifold, however the metal tube goes down to the egr filter and was dry rotted out at the bottom of the filter

therfore its not even being used and is not even hooked up to the exhaust......

all i did was j b weld the bottom of it into a uniform shape.



COULD THAT BE THE PROBLEM???

SHOULD I REMOVE IT???

CAN I PLUG IT AT THE MANIFOLD SOMEHOW???
_________________
Chris

[Mike924]

If it's letting air into the manifold, it needs to be plugged. Otherwise the motor will run be running lean and could cause valve damage; could eeven be a source of the 'overheating', but it would have to be real bad for that.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

[joecitizennn]

EGR valve must die!!!!!!!!!!!!!!!! Bypass it.
_________________
87 924s
88 924SE gone
447 hp cgt clone
87 924S gone
84 944 sold
83 944 sold
89 turbo S LSD, ABS etc
86 951 white rocket
85 944 sport everything.
84 944 sold.
87 944 sold