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Discussion Starter · #1 ·
My mx5 has never run 100%, i think ive narrowed it down to being timing related. I went to set my timing to the standard 10degrees at the weekend, but it never seems to stay in place and it jumps around between 2or3 degrees. im more than positive the timing lights fine.

I disconnected the throttle position sensor and the timing mark stopped jumping around and i was able to set the timing dead on. It sounded like it ran alot smoother but as soon as i plugged in the throttle tps the timing mark jumed all over the place again.

Any ideas??? and i did the paper clip in the diagnostic pins.
 

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I don't know a lot about the standard mx5 engine management so maybe someone will correct me but if your throttle switch was knackered and was sending a noisy signal to the ECU it would cause the timing to jump around.

You could start off by trying these test steps to check your throttle switch is ok.
 

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I don't know a lot about the standard mx5 engine management so maybe someone will correct me but if your throttle switch was knackered and was sending a noisy signal to the ECU it would cause the timing to jump around.

You could start off by trying these test steps to check your throttle switch is ok.
Is the CAS fixed and not moving?
Paperclip in the Diagnostics box and set idle.
Remve paperclip, idle should move for a short while whilst the ECU takes over, and then drop back to normal.
Paperclip back in then adjust timing.
h
 

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Discussion Starter · #5 ·
Thanks for the replies ill check to see what t tp is like with that link at the weekend. i did to the timing and idle before and it didnt change much. The CAS was tighten and not moving when it was still jumping around.

thanks again for the help.
 
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