Injectors vs. Intake Manifold - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 03-22-2011, 07:20 PM   #1
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default Injectors vs. Intake Manifold

What's the easiest way to replace the injectors in an '02? I just went to do it, expecting it to be easy like my '94, but it looks like the intake manifold is in the way. Can I just take the top part off the manifold and get to them, or is there more to it?

Also, the old injectors are thin and pointy, the new ones are regular shaped. Not sure how I didn't notice it before, but are my new ones going to fit alright?
skidude is offline   Reply With Quote
Old 03-22-2011, 07:31 PM   #2
Elite Member
iTrader: (2)
 
fooger03's Avatar
 
Join Date: Jan 2009
Location: Columbus, OH
Posts: 4,132
Total Cats: 187
Default

remove upper intake manifold (which involves removing TB and associated bracing), then remove 3 bolts in fuel rail. The fuel rail bolts go through 3 plastic heat insulators before bolting into the head. DON'T LOSE THE INSULATORS or you will have to sell your soul to the devil to find them. The injectors will come away from the head still attached to the fuel rail.
fooger03 is offline   Reply With Quote
Old 03-22-2011, 11:37 PM   #3
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

Thanks! And I assume the new injectors, as fat as they are, will fit just fine?

Also, should I clean anything while I have the top of the intake off, or leave it it's probably fine?
skidude is offline   Reply With Quote
Old 03-23-2011, 12:12 AM   #4
Elite Member
iTrader: (8)
 
Join Date: Dec 2008
Location: Kingston, Ontario
Posts: 2,791
Total Cats: 71
Default

Take off the intake and leave the throttle body on. Or you will need a new gasket.
shlammed is offline   Reply With Quote
Old 03-23-2011, 01:34 AM   #5
Slowest Progress Ever
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,808
Total Cats: 183
Default

I have done this over 6 times.
I do it like this:
Remove the inlet piping going to the throttle body. Unplug your TPS, and IAC valve. Remove all bolts on the upper intake, I think there's 6? The ground source near the throttle body has a funny little bent tab looking bracket with 2 bolts in it, take it off. Under the throttle body there is a tab with 2 bolts in it that I think bolt to the lower intake? I can't remember, it's late, but those 2 bolts need to come out. The actuator for the VICS, you can leave connected. I just lift my intake up off the dowel pins and kinda pull it outta the way.
Towards the firewall side of the intake manifold, there is a round looking thing with 4 phillips head screws on it. Take out the screws and lift that thing out. Next is the fuel rail. 3 bolts I believe hold it down. Take them out, and lift the rail, but watch, cause under the rail is little spacers and if they fall out, they tend to dissappear quick. They are camoflage with your frame, meaning when they fall, that's where they usually land and they become invisible. Anyway, once you lift up the rail, pull 1 injector at a time, and you can sort of manuever them around to get the plug off of em. Make sure you lube up your new o-rings with vaseline or something before putting them in. I put all 4 injectors into the rail first, then I carefully seat them in the bosses on the intake. The fuel rail should easily go down against the black spacers. If it doesn't you need to make sure your injectors are going in right.
I have this down to a science. I can do this job start to finish in less than 1/2 an hour. The first time took me a while. Just have patience, put everything back exactly as you took it off, don't try to force anything and you'll do fine.
thirdgen is offline   Reply With Quote
Old 03-23-2011, 08:17 AM   #6
Elite Member
iTrader: (2)
 
fooger03's Avatar
 
Join Date: Jan 2009
Location: Columbus, OH
Posts: 4,132
Total Cats: 187
Default

remove your fuel filler cap and drain the pressure from your fuel lines first - in case it's been awhile and you've forgotten since doing them on your '94
fooger03 is offline   Reply With Quote
Old 03-23-2011, 09:15 AM   #7
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

Thanks for the reminder on th pressure, I had actually forgotten.
skidude is offline   Reply With Quote
Old 03-23-2011, 10:29 AM   #8
Elite Member
iTrader: (2)
 
Join Date: Jan 2007
Location: Los Angeles, CA
Posts: 8,782
Total Cats: 119
Default

Yah don't drop **** down your intake manifold.

DON'T LOSE THE STUPID INJECTOR RETAINERS. Your **** will LEAK without them.

DO NOT OVER TIGHTEN THE FUEL RAIL TO THE HEAD. SNUG IS OK.

Once you have everything fuel related on, put your key to power on. The fuel pump will prime. LOOK FOR LEAKS. IF NO LEAKS THEN BOLT YOUR INTAKE PLENUMBACK ON AND PLUG YOUR **** UP.
Faeflora is offline   Reply With Quote
Old 03-23-2011, 10:34 AM   #9
Elite Member
iTrader: (12)
 
Join Date: Apr 2008
Location: Springfield IL
Posts: 2,750
Total Cats: 24
Default

With the car running, unplug the fuel pump fuse. This will drain the pressure out of the rail. You will still have a full rail, but not a full pressurized rail.
chpmnsws6 is offline   Reply With Quote
Old 03-23-2011, 11:09 AM   #10
Senior Member
iTrader: (4)
 
Join Date: Nov 2009
Location: Toronto, ON
Posts: 1,479
Total Cats: 6
Default

You can do it with the entire manifold on. I did it without removing anything. Expect cut hands if doing this.
dgmorr is offline   Reply With Quote
Old 03-23-2011, 11:12 AM   #11
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

Quote:
Originally Posted by Faeflora View Post
Yah don't drop **** down your intake manifold.

DON'T LOSE THE STUPID INJECTOR RETAINERS. Your **** will LEAK without them.

DO NOT OVER TIGHTEN THE FUEL RAIL TO THE HEAD. SNUG IS OK.

Once you have everything fuel related on, put your key to power on. The fuel pump will prime. LOOK FOR LEAKS. IF NO LEAKS THEN BOLT YOUR INTAKE PLENUMBACK ON AND PLUG YOUR **** UP.

Something tells me someone had a bad experience or two.
Braineack is offline   Reply With Quote
Old 03-23-2011, 11:16 AM   #12
Senior Member
iTrader: (4)
 
Join Date: Nov 2009
Location: Toronto, ON
Posts: 1,479
Total Cats: 6
Default

Quote:
Originally Posted by Braineack View Post
Something tells me someone had a bad experience or two.
It wasn't in his thread. I refuse to believe anyone person can have anymore fail on one car. I think he just has volume control issues or likes yelling.
dgmorr is offline   Reply With Quote
Old 03-23-2011, 09:39 PM   #13
Elite Member
 
Join Date: Mar 2010
Location: Detroit
Posts: 1,524
Total Cats: 27
Default

Quote:
Originally Posted by dgmorr View Post
You can do it with the entire manifold on. I did it without removing anything. Expect cut hands if doing this.
Wow, kudos if true. It's so easy to pull the upper though, I'd still go that route.
flounder is offline   Reply With Quote
Old 03-23-2011, 09:41 PM   #14
Elite Member
iTrader: (2)
 
Join Date: Jan 2007
Location: Los Angeles, CA
Posts: 8,782
Total Cats: 119
Default

Quote:
Originally Posted by dgmorr View Post
You can do it with the entire manifold on. I did it without removing anything. Expect cut hands if doing this.
No, you can't. First of all the harness is in the way.

Secondly please explain how you access the fuel rail bolts.

Third there is nowhere for the injectors to go.

Fourth the spacers will disappear.
Faeflora is offline   Reply With Quote
Old 03-23-2011, 09:54 PM   #15
Elite Member
iTrader: (2)
 
Join Date: Jan 2007
Location: Los Angeles, CA
Posts: 8,782
Total Cats: 119
Default

Quote:
Originally Posted by shlammed View Post
Take off the intake and leave the throttle body on. Or you will need a new gasket.
Lies. You will not need a new gasket if you take the throttle body off.

Also, here's a nifty time saving trick if you're too much of a ***** to remove your throttle body:

Remove the throttle body bolts and nuts. Leave the intake piping coupler on, attached to the throttle body. YANK ON THE ******* INTAKE PIPING LIKE YOU'RE MILKING A BULL ELEPHANT. eventually the thing will come off and you will have saved a whopping 10 minutes.
Faeflora is offline   Reply With Quote
Old 03-23-2011, 11:40 PM   #16
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

I did it. I took the throttle body off and didn't ruin the gasket, and I took the top of the intake off and didn't ruin that gasket, and I didn't lose any spacers, and the new injectors fit and megasquirt runs them just fine (a little lean, but I'll tune that out later). Overall a pretty easy job, though a little more time consuming than it was on the '94.
skidude is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 Yesterday 10:04 PM
Changing from 460cc to flow force 610cc in diypnp 90 Turbo MEGAsquirt 19 10-19-2015 04:23 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Moroso Air Oil Separator Catch Can Aroundcorner Miata parts for sale/trade 2 10-01-2015 04:20 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:05 PM.