7M GTE ignition timing guide needed...

Bill UK · 03-04-2011, 08:07 PM

I don’t know if you know this, but if you look at the coil pack photo, you will only see 3 coil modules. That’s because the Supra 7M-GTE operates a wasted spark system. One coil for two HT Leads (or wires as they say in the US) So when No 1 sparks, 6 will also spark as a wasted spark. The same applies to 3 - 4 and 2 – 5. That’s why when you use a strobe meter to set the timing you don’t need to connect the strobe induction lead to No 1 spark lead, you can use No 6 instead. This will save the trouble of removing the black plastic coil pack cover trim to gain access to No 1 lead. This doesn’t apply to the 7M-GE with a conventional distributor, use No I spark lead to connect the strobe light.

03-04-2011, 08:07 PM	#4
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	I don’t know if you know this, but if you look at the coil pack photo, you will only see 3 coil modules. That’s because the Supra 7M-GTE operates a wasted spark system. One coil for two HT Leads (or wires as they say in the US) So when No 1 sparks, 6 will also spark as a wasted spark. The same applies to 3 - 4 and 2 – 5. That’s why when you use a strobe meter to set the timing you don’t need to connect the strobe induction lead to No 1 spark lead, you can use No 6 instead. This will save the trouble of removing the black plastic coil pack cover trim to gain access to No 1 lead. This doesn’t apply to the 7M-GE with a conventional distributor, use No I spark lead to connect the strobe light.