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Reply With QuoteSpark plugs don't just crack. Find out why. Look carefully at fueling vs. timing because I can't imagine how this happened otherwise.
This is a discussion on first tune not so good within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So i had a couple problems, some bad some not so bad. 1st- My intercooler was leaking (solved for now) ...
So i had a couple problems, some bad some not so bad.
1st- My intercooler was leaking (solved for now)
2nd- My mbc wasn't working right. boost was up and down
3rd- 2 spark plugs were cracked!
4th- Tune was not completed because i need to figure out another issue. He said my timing was jumping across the map. He said maybe its bad gas or I need to do a compression test. Which i am doing tomorrow.
Anyone know of anything else I should check for?
08 wrx 66,000 miles
Perrin intake
Borla muffler
DP no cat
MBC
Spark plugs don't just crack. Find out why. Look carefully at fueling vs. timing because I can't imagine how this happened otherwise.
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he said they were probably put in wrong..
compression test
#1 & 4 are 135.
#2 & 3 are 140.
What is the specs? Im looking and i think those are good but find sti's not wrx. I dont know if there is a difference
Those aren't really that bad though a little low, and they are all pretty consistent with each other which is what you want. Anywhere around 140 and above is considered normal.
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leak down test is next the tuner said. if i pass bad gas or coil
those readings are cold motor btw
Isn't the compression test supposed to be done on a warm motor?
The Hawk-Eye Alliance #90|The Blobeye Syndicate #0|The Stink-Eye Mob #0|N.E.R.D. Founding Member & #3
2005 STi WRB w/Silver BBS Stage II OpenSource tuned by: Mattypants @ WTF Tuning
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"If I have 10 ice cubes and you have 11 giraffes, how many pancakes can fit on the roof? Purple, because aliens don’t wear hats" -Ying
ive read both but according to him there fine. im getting the leak down anyway
That's OK for a cold motor. You should be doing compression tests on a warm motor per the shop manual (coolant temp > 100 degrees C IIRC)
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Originally Posted by Mikie13
whats the best way to do leak down
turn the crank to build pressure than read gauge?
You can do a compression test on a cold motor but you generally want to add some oil to the cylinders first. You don't want to do it dry. You can just pull the fuel pump relay and crank the motor over a couple times. But you do get more accurate results on a warm motor.
Also for future reference: Technical Articles
Uh.....no. You need an air compressor and the cylinder needs to be TDC on the compression stroke. Google " cylinder leak down test"
http://www.carcraft.com/techarticles...r/viewall.html
Last edited by Donkey; 10-12-2012 at 01:14 PM.
Over torqued when they got put in could it it right?
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