I think i fucked up my motor PLease help - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-17-2007, 12:09 AM   #21
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i bought a 40mm bolt and its to short
What di I say sixteen posts ago?
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The bolt you need is M8-1.25 x 45mm.
Go to an ACE Hardware store. There is one in every town, and they have the best selection of metric hardware of any local shop I've seen.

Good news on the power steering I suppose. Curious that it picked this exact time to go, but better P/S fluid coming out of the car than engine oil.
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Old 10-17-2007, 01:19 AM   #22
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ok heres my numbers which i forgot to hold the throttle open wide which im certain wouldnt make a bit of a difference as far as the variation goes plus the motor was kinda cold. but from closest to the firewall to furthest the numbers are 105;148;150;140. so now my question is this how can i find out if its my valves leaking or if its my piston rings leaking or head gasket?
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Old 10-17-2007, 01:44 AM   #23
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leakdown test.
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Old 10-17-2007, 01:46 AM   #24
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how do i do that and exactly how will that tell me what it is? my other freind with a 240 told me to do that also.
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Old 10-17-2007, 02:38 AM   #25
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looks like something is wrong with trusty #4
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Old 10-17-2007, 02:52 AM   #26
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Go to a shop and ask them to do it for you or get a leakdown tester from harbor freight and do it yourself with an air compressor. The tester is like $40 from HF.
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Old 10-17-2007, 10:30 AM   #27
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Since you have a compression tester, repeat the compression test but add a little oil to cylinder #4 and see if the numbers come up. If they increase significantly, most likely the rings.
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Old 10-17-2007, 12:35 PM   #28
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how much oil should i add?
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Old 10-17-2007, 12:50 PM   #29
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a teaspoon.
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Old 10-18-2007, 09:12 PM   #30
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ok i added a cap full of oil to cylinder # 4 and did the compression test again still no open throttle but the motor was warm and my first number was 150 then 135 then 120 then last was 115. every time i did it the numbers kept getting lower. so basically i need to do a leak down test then? i dont wanna start having things replaced or replacing myself and find out that wasnt the problem.
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Old 10-18-2007, 09:19 PM   #31
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Why aren't you opening the throttel that is how it is done? My nissan would read around 130-140 psi with the throttle close and 180-190 with it opened. Also with a closed throttle the cylinders with a more direct path from the intake stream, will cause variantions.
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Old 10-18-2007, 09:51 PM   #32
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yeah but im certain that ....oh **** i just got it ill try it with full throttle but lets say my numbers dont change much then were to go next? plus if there were no compression problem in that cylinder wouldnt the numbers not change from adding oil?
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Old 10-18-2007, 10:05 PM   #33
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adding oil takes up more space in the CC so it will raise compression unless you have totally bypassed your rings. MY blown motor with #2 showing 90 psi compression and the piston basically shattered. Adding oil put me to 130 psi. the rest where around 180 or so.
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Old 10-18-2007, 10:26 PM   #34
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adding oil also seals the rings better and therefore the compression should go up....
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Old 10-19-2007, 05:40 AM   #35
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i understand that what im saying though is even with the throttle closed im still probably correct by saying my number 4 cylinder is bad? but today i noticed either im actually leaking oil. i drove it today and when i went to leave i saw some oil under the car and just to check i checked my oil level and i had lost a quart of oil so im wundering could that oil be from a blown headgasket and therefore the bad compression also from the gasket?
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Old 10-19-2007, 06:02 AM   #36
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A blown ring will push oil past the ring into the compression chamber, producing white smoke in the exhaust and oil consumption. Basically, you fucked up your #4 cylinder by running the car lean due to too much boost, and you need a new engine.
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Old 10-19-2007, 10:40 AM   #37
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yes, #4 is toast. oil just helps pinpoint the problem.

leakdown test is best for this.
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Old 10-19-2007, 01:51 PM   #38
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**** **** ****.
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Old 10-19-2007, 02:18 PM   #39
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welcome to the club, i know it seems like its the end of the world. but its really not, you'll learn more about your car doing this yourself than you ever wanted to know. i blew a motor when my wg actuator line came off and i boosted 23psi. just roll with the punches, hang in there. and you'll get it done. its really an easy engine to remove/reinstall.
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Old 10-19-2007, 09:07 PM   #40
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doing the work and having the know how isnt my problem my problem is noplace to do the work and no money to do the work. so i guess my car shall sit now.
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