924Board.org

mwmx54 · Joined: 17 Jul 2007 Posts: 11 Location: alpine utah

what are some common problems with these engines? i will more than likely be buying one in the next week, its in really good condition but not running. i just wanted to ask what to look for, its only a hundred dollars, so.... where would be a good place to get an engine for it? and what years and models are interchangeable? im not sure if it is turbo'ed or not yet, but i will know soon.
EDIT: its a 1979, i hope this is the right place to post.
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79 924
99 tacoma
94 sas'd toyota xcab
06 kx2fiddy

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

This post should have been placed in General Discusssions.

The car that you are writing about is a 924, not a 924S, and most probably it is a 924 NA (normally aspired). The 931 (924 Turbo) was not introduced to the U.S. Market until the 1980 model year.

The 2.0L 924 engine is fairly bulletproof (unless run out of water or oil), and the engine in the car you may be getting may only need servicing, and/or some minor repair such as a timing belt, or waterpump. But, the Bosch CIS fuel injection system that these cars came with does not like sitting around. Commonly you will find gummed up fuel pumps and fuel distributors on cars that have been sitting two years or more. Fuel distributors are expensive, and cannot be serviced, or rebuilt, they have to be replaced. A replacement fuel pump can easily cost $200 or more, and the fuel distributor $400-$500 (rebuilt) or $900 (new).

seanski44 · Joined: 13 Mar 2006 Posts: 532 Location: Nottingham UK

and earths and wires!!! Check em and clean em and test em..... otherwise, having just helped to get one running after 4.5 years of not running good luck, you can do it!!!

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1998 BMW Z3 2.8 arctic silver & red

1981 168HP 931 S2 blue/tan leather - SOLD

1985 121HP 924 2.0l na modded - SOLD!
1992 968 lux SOLD
1989 944 2.7 lux SOLD

scottc · Posted: Tue Jul 17, 2007 11:51 pm Post subject:

Bought mine as a non-runner too.

Simply to work on, and shouldn't cause you too much grief especially considering how helpful people are on here.

You just need to be systematic as you work through your tests.

mwmx54 · Joined: 17 Jul 2007 Posts: 11 Location: alpine utah

wow, fast replies, thanks alot. i have no idea the last time it was running. i will probably be buying pretty soon and start tearing it apart. ill keep you updated.
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79 924
99 tacoma
94 sas'd toyota xcab
06 kx2fiddy

Vince Ponz · Joined: 02 Nov 2002 Posts: 3581 Location: Florida

Sorry Gohim,
Some of us have 79 turbos. I think there are at least 3 that I know of.

Vince
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"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

Vince,

I wrote "U.S. Market". I see that your is a 79 Euro 931.

Vince Ponz · Joined: 02 Nov 2002 Posts: 3581 Location: Florida

No offense just kidding you.

Vince
_________________
"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

mwmx54 · Joined: 17 Jul 2007 Posts: 11 Location: alpine utah

wells heres the deal, two of the cylinders lost compression, do you think that some valves or rockers, lifters, anything could just be stuck? i think this is what happened because it has been parked for a long time and supposedly ran when parked last...
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79 924
99 tacoma
94 sas'd toyota xcab
06 kx2fiddy

scottc · Posted: Thu Jul 19, 2007 7:28 pm Post subject:

Depends on which 2 have lost compression. Are they next to each other, like cylinder 1 & 2 or 3&4?
That would normally point to the Head Gasket leaking between them.

You could do a leak-down test, bascially tou pressurise each cylinder with an air compressor, then hunt the leak.

mwmx54 · Joined: 17 Jul 2007 Posts: 11 Location: alpine utah

im not sure, the guy doesnt remember, im pickin it up tomorrow. im hopin that its just head gasket, or just something in the head.
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79 924
99 tacoma
94 sas'd toyota xcab
06 kx2fiddy

mwmx54 · Joined: 17 Jul 2007 Posts: 11 Location: alpine utah

alright, i got the car, there is also a 77 924 for sale here but the body and interior are trashed, it says the engine runs great though, will this engine from a 77 fit my 79? thanks for the help guys. the 77 is only 40 bucks.
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79 924
99 tacoma
94 sas'd toyota xcab
06 kx2fiddy

924RACR · Posted: Sat Jul 21, 2007 9:59 pm Post subject:

Yes, but depending on exact build, the intake valves may be smaller and have a poor (economy) cam pushing them.

Verify the compression results yourself, and if that is indeed the case, consider pulling the motor that's in there and rebuilding it. It's not that hard with access to the right equipment, and you'll have a fresh motor.

PS - put your location in your profile, please!
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

mwmx54 · Joined: 17 Jul 2007 Posts: 11 Location: alpine utah

the wiring on this thing is a joke, i have all of the schematics but wiring is definately something i am not good with. he tried using some sort of aftermarket harness, maybe a painless one. but man it is a hack job. does any one have some pictures of the relay board with so i can sort of see how things should go? that would be very helpful, also what do i need to connect to hook up a trigger starter? so i can bypass the ignition? i just want to do a compression check to see if i can get it going, im going to get a 77 parts car soon and maybe i can pull the head off of mine and use its lower end if i have some bad cylinders.
_________________
79 924
99 tacoma
94 sas'd toyota xcab
06 kx2fiddy

mwmx54 · Joined: 17 Jul 2007 Posts: 11 Location: alpine utah

this guy new nothing about wiring. nothing on the relay board is connected, i was up pretty late studying the schematics trying to figure it all out and im comin along. i would like to know what wires(color, what they power) are supposed to be connected to the male g and h sections of the relay board. so if anyone can help that would definately help, i have no power to anything still and the battery is charged. all of the relays and fuses are connected. and hopefully right.
_________________
79 924
99 tacoma
94 sas'd toyota xcab
06 kx2fiddy