EJP914
Jun 20 2009, 10:55 AM
Car is 73 1.7 w/ stock FI
With plugs out, engine cold, throttle open all the way, fuel pump disabled, results are:
#1 100 psi
#2 105-110
#3 110
#4 115-120
I have checked all cylinders twice. Readings are approx same each time.
Don't know if it makes a difference on how many times the engine rolls over.
First time was 6. 2nd time was 4.
Not sure what readings would be on a new/rebuilt engine?
Are my results at least acceptable? Not looking to spend the money right now on a rebuild. Thanks in advance for the replies.
jaxdream
Jun 20 2009, 10:59 AM
Did you check your valve / rocker arm settings?? Do the engine turnover with all plugs out , throttle at wide open ?? What type of compression gauge are you using ??
Just some thoughts.
Jaxdream
tat2dphreak
Jun 20 2009, 11:11 AM
Capn or another engine guru will chime in here... but IIRC you need to get your engine warm before doing a test to get true results...
that said, if the results stay, then I think you are ok
EJP914
Jun 20 2009, 01:04 PM
Thanks . Hopefully one the engine experts will respond.
Maybe I will put it back together and try it again after a small drive to get it warm.
Cap'n Krusty
Jun 20 2009, 01:56 PM
Compression test are done HOT, whenever possible. On cars with a plenum intake system, you don't really have to hold the throttle open, either, but it's a good habit. The Cap'n
tat2dphreak
Jun 20 2009, 02:42 PM
good, I'm not completely senile
I remember that when I had my 1.7 the numbers were decent(95+) but widely varying(highest was like 115)... but I did it cold... so I was told to do it warm/hot... the numbers tanked! none were good...
EJP914
Jun 20 2009, 04:39 PM
My thanks to all. Will do it hot! Since I had so much apart I figured I would replace the injector seals since I had a set in a box. Found the fuel lines to injectors have some cracks and I am replacing. Why do simple, short jobs turn out to be all day affairs??? Must be a 914 curse???
tat2dphreak
Jun 20 2009, 05:16 PM
it's a car thing... one thing ALWAYS leads to 3 more...
it's hard on people with ADD, like myself
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