7M GTE ignition timing guide needed...

[amebb]

Hi there

i need some advice on the sequence that the ignition leads go.

Can anyone tell me what cyclinder the leads go from the ignition packs...?

example...

if looking at the coil packs from the top and the turbo is on the left hand side and the intake is on the right hand side ignition coil 1 goes to which cyclinder and so on....

It would be great if anyone has the answer.

Thanks

[Bill UK]

Number 1 at the front, then 2,3,4,5 and 6 at the rear.

[amebb]

Ah thats brilliant Bill. Thanks for your help. At least i can get my car done now over the weekend.

Thanks again.....

[Bill UK]

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.

[amebb]

Hi Bill, Yes i read that also about the strobe light being applied to ignition lead 6.

The problem that i have is that the car starts but the idle is very rough. So, i need to recheck the ignition and also the CPS and the full timing to make sure that everything is correct.

That way i can eliminate most possible issues with the engines timing.


What i am going to do is the following to set up my timming:

1 Open up the oil cap and turn the engine so that piston 1 is TDC. This can be done looking down the oil hole over looking piston 1.

2 Make sure that the exhuast and intake cam shafts are pointing to the markings on the back plate (if that makes sense).

3 The crank shaft pulley is pointing to 10 degrees.

4 Make sure CPS is inserted in correctly.

Then when that is all set and lets assume we have the ignition leads in correctly.
then start the engine and use the strobe to make the timing perfect.


I hope i can get this car working as it should be.... loads of fun to drive hmmmm


Thanks

[btwilson86]

Originally Posted by amebb

Open up the oil cap and turn the engine so that piston 1 is TDC. This can be done looking down the oil hole over looking piston 1

All this will do is let you see the lobe on the intake cam. If you have the upper timing cover off, just align the harmonic balancer with the notch at 0?. If the cam gears also align with the marks on the rear plate, your on the compression stroke. If not, then rotate the crankshaft 180?. If they still don't align, then you will need to loosen the timing belt and adjust the camshafts to correct your valve timing.

Also, be sure to install the cps with the crank at 0?, not at 10? BTDC.

[amebb]

Hi, thanks for that information. I will try that over the weekend and fingers crossed it will be ok.

I have the haynes manual and other manuals too so if i get stuck i have some kind of reference to assist me as well as this site.

Wish me luck ..lol

[Bill UK]

The crank shaft pulley marking should be at 0 (zero) not 10 degrees. Its only when the pins in the check connector box are linked and the engine is ticking over will the pulley be at 10 degrees. To check no 1 piston is at top dead center I normally remove the No1 spark plug and insert a thin wooden dowel rod.

[amebb]

thanks bill..... your correct it should be at zero and NOT 10 degrees - my fault.... need booze brain slooooow

I normally use that method that you told me to find TDC, spark plug 1 out, insert long rod and turn engine till you get TDC.

Thanks

[Bill UK]

Thinking about it, inserting a dowel into the piston to check TDC is a waste of time. You could be on the exhaust stroke or compression stroke depending on the cam position and crank markings. btwilson86 is the correct way.