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Old 02-27-2007, 02:40 AM   #1
wildacex187
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Question new to boxers. help with compression test

i've seen a couple of wrx engine bays and i have no idea how to get to the spark plugs. im checking out a car tomorrow and would like to find out how to reach them the easiest way. thanx guys
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Old 02-27-2007, 02:58 AM   #2
lovethebugeye
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on the driver side you hve to remove the washer fluid resevoir, and if you want you can remove the battery as well but its bot necessary. once these are ot of the way you can see the coil packs on the lower side of the block. these are each held by one 12mm bolt.

on the passenger side you have to remove the airbox and once that's off you can get to the coil packs.

hope that helps.
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Old 02-27-2007, 03:00 AM   #3
NLspiked02
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pasenger side is easy. there is enough room to get a socket and extention in there. the drivers side is a bit harder. youll have to remove the washer tank and maybe the battery for some more room. after that, just slip your arm in and your good to go. put aside about an hour to do so. it really isnt that hard but be careful putting them back in that you do not cross thread them. try to put them in as far as you can with your hand and the extention and then tighten them with the wratchet. i can do it in about 30 min now. took me about an hour and a half to do it the first time. that is taking my time and making sure that i did not loose anything. happy tuning!
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Old 02-27-2007, 03:01 AM   #4
NLspiked02
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he beat me to it. to get the coil packs off, use a small screwdriver or maybe a philips head bit in a socket. that worked the best for me.
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Old 02-27-2007, 04:23 AM   #5
wildacex187
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hmm dunno if the guy that im buying the car will let me take apart his engine bay to get a compression test. i hear the cylinder closer to the turbo is the one that gets messed up first. u guys think if i get good numbers on the cylinders on the pass side it would be ok to assume they're the same on driver? wat numbers should i look for?

thanx alot guys this really helps
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Old 02-27-2007, 09:04 AM   #6
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Quote:
Originally Posted by wildacex187 View Post
hmm dunno if the guy that im buying the car will let me take apart his engine bay to get a compression test. i hear the cylinder closer to the turbo is the one that gets messed up first. u guys think if i get good numbers on the cylinders on the pass side it would be ok to assume they're the same on driver? wat numbers should i look for?

thanx alot guys this really helps
...if the guy won't let ya do the test....walk.

...and these things usually eat #3, but any of the cyls can be borked.

..and as far as numbers....

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Old 02-27-2007, 10:18 AM   #7
rkramer
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nobody mentioned it, but if you are new to subarus you might spend time tracing sparkplug wires to help you find them. subarus do not have spark plug wires!
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Old 02-27-2007, 12:02 PM   #8
wildacex187
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i didnt say they did. thanx for the help guys
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Old 02-27-2007, 01:13 PM   #9
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Quote:
Originally Posted by wildacex187 View Post
i didnt say they did. thanx for the help guys

nope, didn't mean to imply you didn't know they didn't... first time i looked under the hood of a suby i tried to find the spark plug wires, took a long time!
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Old 02-27-2007, 01:22 PM   #10
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^^ You still looking?

Jay-R
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Old 02-27-2007, 01:50 PM   #11
bugeye829
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well since you have to remove all the spark plugs to do the compression test you might as well test all 4
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Old 02-27-2007, 02:28 PM   #12
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How do I open the throttle body? With the gas pedal or do I have to take the intercooler off and do it by hand.(BTW 05 STI)

Thanks
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Old 02-27-2007, 05:52 PM   #13
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Quote:
Originally Posted by STISTL View Post
How do I open the throttle body? With the gas pedal or do I have to take the intercooler off and do it by hand.(BTW 05 STI)

Thanks
For DBC cars you can just pull the throttle cable by throttle body or put the pedal to the floor when you crank it. Don't know if the pedal to the floor while cranking it works for DBW though.
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Old 02-27-2007, 08:26 PM   #14
wildacex187
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went to see the car today. looks really nice from the outside, nice wheels with the brembos peeking, nice wing look good. he opened the hood and saw the heat shield on the turbo was missing. he told me he rebuilt the turbo so im like ok. then i see a little smoke coming from the turbo. "its just oil from when i put the turbo back on, it'll burn off" says the seller. i put my head closer to the firewall and it was smelling of burning coolant . i told him this and his comment is "are u sure? the turbo is oil cooled". well im pretty sure that it is and even if its not there shouldnt be any white smoke burning around the oil. revved it a lil and it was having problems catching the 800 rpm idle. it would drop to 300 then go back up. mounts looked like they need to be replaced. ok so fine it warmed up and i asked him to take me a ride in it. went inside and the center console was all loose. the ebrake handle had to be pulled allll the way up and he said the factory radio took a dump so he stuck a old pioneer unit in there loose and left one dinn without a cover shoing the inside of the dash . car drove well. it revved freely but felt slow. he said he has the boost at 9 psi. i dunno if thats possible if the stock boost is 13. wont the stock wastegate not allow it to go any lower? anyway i drove it next and the clutch felt good. the brembos also felt pretty nice and stopped rather nicely with good pedal feel. the 6 speed tranny felt good but there was a noise. when i asked him about it he said that when he put the sti tranny in he forgot to put in the 2 bolts that hold the shifter up so the shifter is rubbing against the driveshaft . well after the drive i told him that there are alot of things to be done to the car and i dont want nor need another project aside from my s13. he told me he had another buyer that was offering him 11500 for it and that he would let me take it for the same price but i dont think its even worth that much regardless of the sti tranny and brembos.

wat do u guys think? haggle or run away?

Last edited by wildacex187; 02-27-2007 at 08:43 PM.
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Old 02-27-2007, 08:39 PM   #15
themarxist
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Run! Fast!
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Old 02-27-2007, 08:48 PM   #16
dibblejr
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Here's a free tip for you;

The best advice you will ever get;

No matter who you are buying it from (dealer or Individual) take $100-200 of your own money and ask to take it to an independent inspector. If the dealer/ individual does not let you do this simple walk away.
The dealer 1000 point inspection is no good and usually bogus. The small things that they claim to inspect is only done to try and convince you to take the car "as is".
You also want to get a compression test done, this may be done at the same place you get it inspected.
Do not act like you need the car (desperate) they've got you then. Test drive the hech out of the car without the radio on. This is another dealer stunt. Turn the radio on so you cannot hear the engine/ tranny. It is cheaper to replace the stereo then to replace a motor/ tranny.
If you take your time, find the car you like best and do what I mentioned above you will turn out ok.
I almost forgot, do not trust CARFAX, it is only as good as the seller/ insurance company. Many accidents get oaid out with cash therefore no CARFAX was ever submitted.

Good luck
Jay-R

** Extra note about your post above; Our turbos are not rebuildable in the US. I doubt the seller sent the turbo to Japan for a $500 rebuild. But pay attention to my above how to buy a car message. I would say there are too many things wrong with the car, if you take it to an independant inspection they would probably recommend you to "RUN AWAY"
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Old 02-27-2007, 08:51 PM   #17
dibblejr
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I have a longer version of the how to filed if you need that.
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Old 02-27-2007, 10:15 PM   #18
bugeye829
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good choice not buying it.. sounds like the owner was a hacker
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Old 02-27-2007, 11:58 PM   #19
wildacex187
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well the search continues. im just scarred of transmission failure. i knwo i know its all in how u drive but still its going to be in the back of my mind.
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Old 02-28-2007, 12:03 AM   #20
dibblejr
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^^ Always go with your gut when making decisions, but it helps to do what I said above.

Good luck on the quest, take your time, dont get overly excited and miss the major items over changes that crooks do to get you to buy.

Jay-R
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