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

99 head swap backfires won't start

Old Aug 26, 2011 | 10:27 AM
  #21  
Ben's Avatar
Ben
Supporting Vendor
iTrader: (33)
 
Joined: Jul 2006
Posts: 12,659
Total Cats: 134
From: atlanta-ish
Default

You'll be a pro next time.

http://www.miata.net/garage/timingbelt.html
__________________
Chief of Floor Sweeping, DIYAutoTune.com & AMP EFI
Crew Chief, Car Owner & Least Valuable Driver, HongNorrthRacing

91 Turbo | 10AE Turbo | 01 Track Rat | #323 Mazda Champcar

Originally Posted by concealer404
Buy an MSPNP Pro, you'll feel better.
Old Aug 26, 2011 | 10:30 AM
  #22  
olderguy's Avatar
AFM Crusader
iTrader: (19)
 
Joined: Oct 2004
Posts: 4,716
Total Cats: 364
From: Wayne, NJ
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.
Old Aug 26, 2011 | 10:31 AM
  #23  
shlammed's Avatar
Elite Member
iTrader: (8)
 
Joined: Dec 2008
Posts: 2,910
Total Cats: 51
From: Kingston, Ontario
Default

that link describes it better.
Old Aug 26, 2011 | 10:42 AM
  #24  
richyvrlimited's Avatar
Elite Member
iTrader: (1)
 
Joined: Jun 2006
Posts: 2,642
Total Cats: 42
From: Warrington/Birmingham
Default

Originally Posted by olderguy
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.
Old Aug 26, 2011 | 01:38 PM
  #25  
guestlive85's Avatar
Thread Starter
Newb
 
Joined: Jan 2011
Posts: 26
Total Cats: 0
From: Columbia SC
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?
Old Aug 26, 2011 | 02:29 PM
  #26  
sixshooter's Avatar
Moderator
iTrader: (12)
 
Joined: Nov 2008
Posts: 22,204
Total Cats: 3,560
From: Tampa, Florida
Default

More pictures just in case, please.

I loved "We doubt because we care", hahaha!
Old Aug 26, 2011 | 03:11 PM
  #27  
guestlive85's Avatar
Thread Starter
Newb
 
Joined: Jan 2011
Posts: 26
Total Cats: 0
From: Columbia SC
Default

okay I will tear into it again and send more pics
Old Aug 26, 2011 | 03:25 PM
  #28  
soviet's Avatar
Elite Member
iTrader: (10)
 
Joined: Jan 2010
Posts: 3,493
Total Cats: 269
From: VA
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  
Old Aug 26, 2011 | 05:50 PM
  #29  
guestlive85's Avatar
Thread Starter
Newb
 
Joined: Jan 2011
Posts: 26
Total Cats: 0
From: Columbia SC
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  
Old Aug 26, 2011 | 05:55 PM
  #30  
guestlive85's Avatar
Thread Starter
Newb
 
Joined: Jan 2011
Posts: 26
Total Cats: 0
From: Columbia SC
Default

The car is running rich, has a low idle around 500R RPM, and has low vacuum around 5 In Hg. Any pointers?
Old Aug 26, 2011 | 06:18 PM
  #31  
AredMiata's Avatar
Junior Member
 
Joined: May 2011
Posts: 115
Total Cats: -1
From: Columbia, SC
Default

Could be a tooth off?
Old Aug 26, 2011 | 07:10 PM
  #32  
sixshooter's Avatar
Moderator
iTrader: (12)
 
Joined: Nov 2008
Posts: 22,204
Total Cats: 3,560
From: Tampa, Florida
Default

Bent valve? lol j/k.
Old Aug 26, 2011 | 07:43 PM
  #33  
guestlive85's Avatar
Thread Starter
Newb
 
Joined: Jan 2011
Posts: 26
Total Cats: 0
From: Columbia SC
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.
Old Aug 26, 2011 | 08:15 PM
  #34  
Savington's Avatar
Former Vendor
iTrader: (31)
 
Joined: Nov 2006
Posts: 15,442
Total Cats: 2,106
From: Sunnyvale, CA
Default

lol @ "we doubt because we care"

Compression test to rule out the obvious, then reset your base timing.
Old Aug 27, 2011 | 04:16 AM
  #35  
Golferluke's Avatar
Junior Member
 
Joined: Oct 2009
Posts: 496
Total Cats: 3
From: Springfield, MO
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?
Old Aug 28, 2011 | 10:51 PM
  #36  
guestlive85's Avatar
Thread Starter
Newb
 
Joined: Jan 2011
Posts: 26
Total Cats: 0
From: Columbia SC
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!
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Corky Bell
Prefabbed Turbo Kits
18
Nov 22, 2016 09:01 PM
viriiguy
General Miata Chat
5
Sep 28, 2015 07:39 PM
ScrapinMX5
Meet and Greet
8
Sep 28, 2015 01:04 PM


Thread Tools
Search this Thread

All times are GMT -4. The time now is 08:53 AM.