[Andy-H]

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

 

[TurboBruce]

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]

[

Igniter?

igniter ??? whats that

 

[Andy-H]

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]

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]

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

 

[Andy-H]

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??

 

[Chris' UK Miata]

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

 

[Liam_Bee]

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

 

[Quick Silver]

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]

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]

Chris where did you get those images from ?

Thanks

 

[Quick Silver]

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]

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]

As promised, this is the bugger:

 

[Liam_Bee]

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]

cambelt not snapped or jumped a tooth??

 

[Andy-H]

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]

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.

 

[Andy-H]

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