99 head swap backfires won't start - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 08-26-2011, 11:27 AM   #21
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

You'll be a pro next time.

http://www.miata.net/garage/timingbelt.html
Ben is offline   Reply With Quote
Old 08-26-2011, 11:30 AM   #22
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

Since you probably had the cam gears off, Make sure that the pin in the exhaust points to E and the pin in the Intake points to I.

When everything lines up, your first cam lobes should point outward, also.
olderguy is offline   Reply With Quote
Old 08-26-2011, 11:31 AM   #23
Elite Member
iTrader: (8)
 
Join Date: Dec 2008
Location: Kingston, Ontario
Posts: 2,791
Total Cats: 71
Default

that link describes it better.
shlammed is offline   Reply With Quote
Old 08-26-2011, 11:42 AM   #24
Elite Member
iTrader: (1)
 
Join Date: Jun 2006
Location: Warrington/Birmingham
Posts: 2,658
Total Cats: 39
Default

Quote:
Originally Posted by olderguy View Post
Since you probably had the cam gears off, Make sure that the pin in the exhaust points to E and the pin in the Intake points to I.

When everything lines up, your first cam lobes should point outward, also.
I just point the pins to 12 O'clock, far less confusing.
richyvrlimited is offline   Reply With Quote
Old 08-26-2011, 02:38 PM   #25
Newb
Thread Starter
 
Join Date: Jan 2011
Location: Columbia SC
Posts: 26
Total Cats: 0
Default

Update: the car now starts.

But will only idle with the throttle cracked, Vacuum is low around 5 in hg, and its running around 10 A/F normally 12A/F at idle. the IAC is sucking what seems like a lot of air. If I plug the IAC and start it with the throttle cracked it pulls almost 10 in hg.

I will let the car cool down then try cam timing again? any other thoughts?
guestlive85 is offline   Reply With Quote
Old 08-26-2011, 03:29 PM   #26
Moderator
iTrader: (11)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 15,662
Total Cats: 1,560
Default

More pictures just in case, please.

I loved "We doubt because we care", hahaha!
sixshooter is offline   Reply With Quote
Old 08-26-2011, 04:11 PM   #27
Newb
Thread Starter
 
Join Date: Jan 2011
Location: Columbia SC
Posts: 26
Total Cats: 0
Default

okay I will tear into it again and send more pics
guestlive85 is offline   Reply With Quote
Old 08-26-2011, 04:25 PM   #28
Elite Member
iTrader: (10)
 
soviet's Avatar
 
Join Date: Jan 2010
Location: VA
Posts: 3,517
Total Cats: 256
Default

it's pretty easy. here's how the cam lobes are supposed to be on the first cylinder closest to the timing belt.
Attached Thumbnails
99 head swap backfires won't start-cams.jpg  
soviet is offline   Reply With Quote
Old 08-26-2011, 06:50 PM   #29
Newb
Thread Starter
 
Join Date: Jan 2011
Location: Columbia SC
Posts: 26
Total Cats: 0
Default


correct cam timing

New plug, ran about 30 minutes
Attached Thumbnails
99 head swap backfires won't start-018.jpg   99 head swap backfires won't start-013.jpg  
guestlive85 is offline   Reply With Quote
Old 08-26-2011, 06:55 PM   #30
Newb
Thread Starter
 
Join Date: Jan 2011
Location: Columbia SC
Posts: 26
Total Cats: 0
Default

The car is running rich, has a low idle around 500R RPM, and has low vacuum around 5 In Hg. Any pointers?
guestlive85 is offline   Reply With Quote
Old 08-26-2011, 07:18 PM   #31
Junior Member
 
Join Date: May 2011
Location: Columbia, SC
Posts: 115
Total Cats: -1
Default

Could be a tooth off?
AredMiata is offline   Reply With Quote
Old 08-26-2011, 08:10 PM   #32
Moderator
iTrader: (11)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 15,662
Total Cats: 1,560
Default

Bent valve? lol j/k.
sixshooter is offline   Reply With Quote
Old 08-26-2011, 08:43 PM   #33
Newb
Thread Starter
 
Join Date: Jan 2011
Location: Columbia SC
Posts: 26
Total Cats: 0
Default

playing with the cam sensor position brought the idle way up and also brought the vacuum up to about 17 in Hg. Still quite not right but I will mess with it more on Sunday.
guestlive85 is offline   Reply With Quote
Old 08-26-2011, 09:15 PM   #34
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,362
Total Cats: 1,323
Default

lol @ "we doubt because we care"

Compression test to rule out the obvious, then reset your base timing.
Savington is online now   Reply With Quote
Old 08-27-2011, 05:16 AM   #35
Junior Member
 
Golferluke's Avatar
 
Join Date: Oct 2009
Location: Springfield, MO
Posts: 497
Total Cats: 3
Default

I dont know if that mark on the wheel is just a scratch or an indicator mark but are you sure the cam is lined up correctly?
Golferluke is offline   Reply With Quote
Old 08-28-2011, 11:51 PM   #36
Newb
Thread Starter
 
Join Date: Jan 2011
Location: Columbia SC
Posts: 26
Total Cats: 0
Default

Reset MS and did base timing it runs pretty well now just need to iron out a few things with the tune and all should be good. Thanks again for everyone's help!
guestlive85 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Another Cast Manifold Corky Bell Prefabbed Turbo Kits 18 11-22-2016 10:01 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM
VR6 to Miata Swap ScrapinMX5 Meet and Greet 8 09-28-2015 02:04 PM


Tags
99 head, backfire, wont start

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 01:51 AM.