Jump to content
SAU Community

Recommended Posts

Hey guys, I am having some problems with my gtr motor and would love some help. To begin with the engine was yanked, pistons changed, rod bolts changed to arp, headgasket was the cometic superstreet hg. My engine management is power fc (got a used one from my engine builder). Head was ported and polished, tomei procams installed with tomei solid lifters, valve springs and retainers etc.. I have been having very low compression since the build, pretty much 90-95 psi across the board. Now here lies some of the other problems, the car has been mildly tuned and when I get on the car the idle becomes really rough and it takes a little while for it to clear up. I started to get compression readings of 0, 30, 90 and now 50 psi on number 4 cylinder. The other cylinders hold at 90 psi. I get no smoke so it leads me to think that the problem is in the head. I am going to be taking the motor out in a couple days to see what's going on but my new problem is now this, yesterday while driving the car it started to give me the "subaru sound" when I stopped I noticed that number 5 was not firing, I have injector pulse and the plug is wet. I also noticed the coilpack had a huge crack on it. I tried to tape it up and the replaced it with the coilpack from number 4. I also changed the plug. I cruised home and when I got home, decided to check the coilpack again, where I saw that the replaced coilpack also cracked! So now I have TWO cracked coilpacks. I have use the gtr manual to check the wiring and also the ignition relay, I ran out of time but I will be checking the power transistor when I get home. Do you think that the power fc is the problem and has anyone else had this problem? The engine is from a 96 gtr and is in a 97 240sx. Going to post a picture.

post-26402-0-77406500-1304200065_thumb.jpg

Edited by steeldawg_69
Link to comment
https://www.sau.com.au/forums/topic/362659-cracked-coilpacks/
Share on other sites

Check that the coilpack cradle is sitting correctly. Also what spark plug are u using? Maybe the spark plug is too long or not completely down in the spark plug well/thread. Check this very carefully.

Does the spark plug screw all the way down?

Check the thread

As for the compression pour some oil down the bad cylinder and see if the compression test result is higher.

If not then maybe the valves arent lapped in correcty or maybe the valve is beeing held open by incorrectly fitted shims

Ok will definately do that. I checked to see if there was anything hindering the plug from going in. It went in without hassle. I just cant figure out what would make two coilpacks pop like that within 15 mins of each other. I'm going to recheck all my grounds. I almost forgot, the builder could not find my shims and he had the machine shop make some, now I'm starting to think......oh boy!

Edited by steeldawg_69

'Low' compression isn't a problem so much as constant compression, as mentioned in other threads and in here due to dodgy testers or badly done.

The problem is, as you have, when one or more are vastly different than the rest.

Good luck with the fix.

Did you speak to engine builder about the compression? Is it actually a problem?

You need to address the coilpack issue completely first, and only once that's done work out if you have a real problem. If it were me, i'd put it back on the dyno once the coilpack issue is fixed and see if it makes the right power. If not, ask the engine builder why you're getting those compression test results.

Big cams can effect compression results, so maybe get a leak down to back it up.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • PayPal is a safe, online payment system that enables businesses and individuals to safely send and receive money, making it an indispensable tool in both personal and professional contexts. However, many users wonder how to send money on PayPal? Don't be alarmed if PayPal is new to you - all the steps can be found by visiting merchant sites with links marked "Pay or send money". Once clicked, select payment method, amount, and add message or note for recipient(s). Upon successful transaction completion you will receive an email containing details of transaction. Let’s start by understanding how PayPal works, how money transfers from banks to PayPal and using various payment methods. Moreover, to transfer money between PayPal and bank, head to the Wallet section and click "Add Account", selecting either "Transfer within seconds with debit" or "Transfer between 3-5 days with bank", and following any instructions shown on screen until completed successfully.   How to Send Money Over PayPal: The Basics Before sending money through PayPal, first create an account. Here is how to set-up a PayPal account: ·         Click “Sign Up” on either the PayPal website or app to enter your basic information such as email address or name into their system. ·         Link your bank account, debit card or credit card directly with PayPal so you can fund transactions directly using these accounts. ·         Verifying your PayPal account will enable you to send and receive more funds. Typically, PayPal requires that you verify your credit card or bank account by making small deposits into it. ·         Once your PayPal account has been established, you can send money through it.   How Do I Send Money to Someone on PayPal? After creating a PayPal account, you can easily send money through it. Here is how to send money to someone on PayPal: ·         First of all log into your PayPal account ·         Once on your dashboard, click on "Send & Request Tab." ·         After this enter the recipient's email or mobile phone number. ·         Enter the amount you wish to send to someone. ·         At last, recheck all the details and click "Send Payment" to complete your transaction if everything looks in order.   How Can I Send Money PayPal for Goods and Services? PayPal provides a safe method for individuals and businesses alike to transfer funds online, both personally and commercially. When paying for goods or services there are additional protections in place both for buyers and sellers. PayPal Buyer Protection offers you peace of mind when paying for products or services with PayPal. In the unlikely event that there is an issue with a transaction, if there are any discrepancies you may dispute it and be eligible for a possible refund. You need to follow the same steps to send money, but select Paying for Services or Goods when prompted. In fact, this extra layer of protection will keep your account safe from fraudulent attacks.   How to Transfer Money to PayPal from Bank? Here is how to transfer money from PayPal from bank: ·         Log into PayPal using either its app or website. ·         Click "Add Funds" in the Wallet section, and add money directly from your bank to your PayPal account. ·         If you have linked your bank account with PayPal, select it under Funding options to select it as your funding option. ·         Enter the amount you would like to transfer to PayPal from your bank balance. ·         Click Add Funds. It typically takes several days for funds to arrive on your PayPal account.   FAQ How can I send money PayPal? Log into your PayPal account, select "Send and Request," enter in your recipient's phone number or email address, select the amount due, payment method of choice and click on "Send Now" - quickly and safely sending money via PayPal is now an efficient method of money transfers!   How do I transfer money to PayPal from a bank? Log into PayPal and select "Add Funds" to transfer money from your bank to PayPal. Select your account number, input an amount, and confirm it. Though the transfer may take up to several days for completion.   How do you send money to someone on PayPal? Simply log into your PayPal account, select "Send and Request", enter the recipient's phone number or email address, select the amount to send, and click "Send Now".   How can I receive payment through PayPal? Senders can easily accept payments with PayPal by providing your PayPal email address and being notified via email when a payment has been completed. When funds appear in your PayPal account, they will appear instantly!
    • At least yours have parkour down pat. One of mine will still trip over his own shadow and fall over... He's a special type of cat... Ha ha ha
    • The question then becomes - was there any fluid coming from that hole before you did the rebuild ?    You may not have noticed, of course.   Depending on how you did the rebuild, the possibility has to be considered that somehow (cleaning ?)  fluid entered that hole and is now being 'forced'  out by small movements of the proportioning valve.   From the factory, there's actually a small rubber plug in that hole but with age and under-bonnet heat it's quite common for it to 'go missing'.  That rubber plug is designed to allow the venting process but also to prevent 'stuff' getting to the area (prevent corrosion, etc).   The plug is also not available as a spare part AFAIA. Personally I wouldn't race and buy a new master just yet but keep an eye on the area to see if the 'leak' continues.   If you're concerned about brake fluid damaging nearby paintwork, cable tie a piece of suitable absorbant material over the hole and remove/monitor occasionally.    Operation of the proportioning valve and the brake master itself won't be affected, but also keep an eye on brake fluid level, of course. In terms of a new master, the genuine part is getting expensive, unfortunately.  Amayama is showing AUD900+.   I was searching recently and there's an aftermarket part available from Japan made by 'Parts Assist': https://zenmarket.jp/en/yahoo.aspx?q=BNR32%2bBM50&p=1 Whether it's any good I have no idea, although in my experience Japanese aftermarket stuff is pretty good quality-wise.   The above site allows overseas buyers to purchase stuff more easily from Japan but there are fees and shipping costs, of course.   The original Japanese seller page is here: https://auctions.yahoo.co.jp/jp/auction/p1197401228 Copper/Nickel is fine but I still prefer bundy tube and it's also cheaper.
    • Your chihuahuas look weird!
×
×
  • Create New...