Car Wont Start

1226 Views 21 Replies 7 Participants Last post by Liam_Bee, Apr 5, 2010

Andy-H

Discussion Starter · Apr 2, 2010

hi gents i have a 95 uk mx5 1.8 that we cant get to start

it wil turn over but will not fire
so far we have found that it has petrol but no spark
having done a bit of searching i have found it could be one of 2 things either the coilpack or the ecu

i am just checking to see if you guys can think of anything else

cheers

1 - 20 of 22 Posts

TurboBruce

· #2 · Apr 2, 2010

b0builder said:
hi gents i have a 95 uk mx5 1.8 that we cant get to start

it wil turn over but will not fire
so far we have found that it has petrol but no spark
having done a bit of searching i have found it could be one of 2 things either the coilpack or the ecu

i am just checking to see if you guys can think of anything else

cheers

Igniter?

Andy-H

Discussion Starter · #3 · Apr 2, 2010

TurboBruce said:
[

Igniter?

igniter ??? whats that

Andy-H

Discussion Starter · #4 · Apr 3, 2010

right latest

metered out the connections to the coil packs can only get output out of 2 of the 3 connections (negative and 12 volts)

any idea what the output out of the third connection should be ??

Liam_Bee

· #5 · Apr 3, 2010

Is 3rd is output to rev counter? Possibly could be the Cam Angle Sensor also (ecu wouldn't know to fire the sparks) worth checking the connections - rear of the right hang bank (exhaust) on the cam cover. Assuming you are getting no start and not a splutter then stop?

Liam_Bee

· #6 · Apr 3, 2010

Igniter is integral in the coilpacks on the 1.8's by the way

Andy-H

Discussion Starter · #7 · Apr 3, 2010

Liam_Bee said:
Igniter is integral in the coilpacks on the 1.8's by the way

that explains that one for me

checked all the alarm and immobilizers today plus all the fuses metered out the coil pack and get voltage on 1 pin and negative on another cleaned all the connection on the coil pack and cam sensor (not checked the sensor properly yet)

still no start

are their any instructions for the cam sensor??

See less See more

Chris' UK Miata

· #8 · Apr 4, 2010

5

This may help...

It may not!

I couldn't find any data on the the cam sensor; If you meter it however, one combination of pins should see you a high/low/flat spot in resistance when you spin it by hand. If you experience this, chances are it's working correctly, which would incite it is sending the right information to the coils. Unless that information is not getting to the coils via bad wiring (melted/broken) or otherwise, there's not much reason why they shouldn't fire.

Chris

See less See more

Liam_Bee

· #9 · Apr 4, 2010

http://www.mx5oc.co.uk/forum/forums/t/818.aspx
how to remove CAS

Quick Silver

· #10 · Apr 4, 2010

I just had the exact same problem with my '92 1.6 Roadster - turning over but not firing.

I checked the fuses/relays & all okay - still not firing

Then disconnected the LT coil connection block & tested but that was live & also was okay, however this time she fired up as if nothing had happened.

Must have been a bad connection to the coil so I'm going to keep an eye on it for the time being.

Andy-H

Discussion Starter · #11 · Apr 4, 2010

Quick Silver said:
I just had the exact same problem with my '92 1.6 Roadster - turning over but not firing.

I checked the fuses/relays & all okay - still not firing

Then disconnected the LT coil connection block & tested but that was live & also was okay, however this time she fired up as if nothing had happened.

Must have been a bad connection to the coil so I'm going to keep an eye on it for the time being.

are these the two connections that connect to the coil pack packs that you removed and reconnected??

Only MX5ives

· #12 · Apr 4, 2010

Chris where did you get those images from ?

Thanks

Quick Silver

· #13 · Apr 4, 2010 (Edited by Moderator)

b0builder said:
I just had the exact same problem with my '92 1.6 Roadster - turning over but not firing.

I checked the fuses/relays & all okay - still not firing

Then disconnected the LT coil connection block & tested but that was live & also was okay, however this time she fired up as if nothing had happened.

Must have been a bad connection to the coil so I'm going to keep an eye on it for the time being.

are these the two connections that connect to the coil pack packs that you removed and reconnected??
[/quote]
Yes mate, the block is grey in colour & is held in position/down by a clip. It goes directly into the coil pack - I'll take a picture of it in the morning & post it here for you.

Andy-H

Discussion Starter · #14 · Apr 4, 2010

Only MX5ives said:
Chris where did you get those images from ?

Thanks

they are the one from the pdf that you can get from one of the other posts

i forgot all about it untill chris posted the pictures

Quick Silver

· #15 · Apr 5, 2010

2

As promised, this is the bugger:

See less See more

Liam_Bee

· #16 · Apr 5, 2010

Quick Silver said:
As promised, this is the bugger:

That's the CAS on the 1.6 - the CAS is on the other cam on the 1.8's (the coil and CAS are swapped)

Packers

· #17 · Apr 5, 2010

cambelt not snapped or jumped a tooth??

Andy-H

Discussion Starter · #18 · Apr 5, 2010

quick update

checked all connections metered out as much as i can all seam fine
power to coilpack but no spark
cambelt not snapped

going to see if i can get a 1.8 coil-pack from scrappers tomorrow and try that

bit strange if both coilpacks have gone but i need to start swapping bits to find problem

Quick Silver

· #19 · Apr 5, 2010 (Edited by Moderator)

2

Liam_Bee said:
That's the CAS on the 1.6 - the CAS is on the other cam on the 1.8's (the coil and CAS are swapped)

not quite sure what you're saying but on the 1.6 the image definately depicts the LT feed to the coil pack - it's the one to the right on the image below with the CAS feeding in to the left & the O2 sensor feed in the middle.

See less See more

Andy-H

Discussion Starter · #20 · Apr 5, 2010

the picture is right for a 1.6 but the problem i am having is a 1.8 the cas is on the other

1 - 20 of 22 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.