Miata Turbo Forum - Boost cars, acquire cats.

Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   Engine Performance (https://www.miataturbo.net/engine-performance-56/)
-   -   99 head swap backfires won't start (https://www.miataturbo.net/engine-performance-56/99-head-swap-backfires-wont-start-60004/)

Ben 08-26-2011 10:27 AM

You'll be a pro next time.

http://www.miata.net/garage/timingbelt.html

olderguy 08-26-2011 10:30 AM

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.

shlammed 08-26-2011 10:31 AM

that link describes it better.

richyvrlimited 08-26-2011 10:42 AM


Originally Posted by olderguy (Post 764166)
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.

guestlive85 08-26-2011 01:38 PM

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?

sixshooter 08-26-2011 02:29 PM

More pictures just in case, please.

I loved "We doubt because we care", hahaha!

guestlive85 08-26-2011 03:11 PM

okay I will tear into it again and send more pics

soviet 08-26-2011 03:25 PM

1 Attachment(s)
it's pretty easy. here's how the cam lobes are supposed to be on the first cylinder closest to the timing belt.
https://www.miataturbo.net/attachmen...ine=1314386721

guestlive85 08-26-2011 05:50 PM

2 Attachment(s)
https://www.miataturbo.net/attachmen...ine=1314395440
correct cam timing
https://www.miataturbo.net/attachmen...ine=1314395440
New plug, ran about 30 minutes

guestlive85 08-26-2011 05:55 PM

The car is running rich, has a low idle around 500R RPM, and has low vacuum around 5 In Hg. Any pointers?

AredMiata 08-26-2011 06:18 PM

Could be a tooth off?

sixshooter 08-26-2011 07:10 PM

Bent valve? lol j/k.

guestlive85 08-26-2011 07:43 PM

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.

Savington 08-26-2011 08:15 PM

lol @ "we doubt because we care" :makeout:

Compression test to rule out the obvious, then reset your base timing.

Golferluke 08-27-2011 04:16 AM

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?

guestlive85 08-28-2011 10:51 PM

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!


All times are GMT -4. The time now is 01:10 PM.


© 2024 MH Sub I, LLC dba Internet Brands