Possessed Tach II

[ahines]

OK, I'm going to try this and let you know, but how about a hosed igniter that both deceives the tach and, thinks the rpm's are high, thus advancing the spark?

> If I crank my '84 and it doesn't start, the tach goes postal :DD - maybe pegs, maybe flops, maybe just runs up to 6000 and sits. But as long as the motor is turning, it's right. What's my deal??? Hoping,Motor:
> The valve cover says 4A, air filter cover says 4AC.SOHC 1.59 liter engine.
> Engine's never been opened or replaced. VIN is JT2AE86C4E
> Car runs perfect when engine is turning, but VERY hard to start.

[Skylar]

Your 4A-C's got electronic ignition? Our AE86 ones never did, although some(?) AE82's got it. So we can't help you there.

Try swapping ignitor, coil and distributor with a known working one. Or even the dash cluster. Take the tach wire off at the coil/ignitor and see if the needle spikes around from voltage variation due to cranking.

[ahines]

Thanks Skylar.
I don't have a spare distributor handy. I just bought this thing last month. The records show a distributor, coil and rotor purchased this year (and it does look new). But the igniter was not replaced. So, it doesn't advance the spark? It is just electronic points?
Anyway, I did get a good igniter I am going to try. If that doesn't do anything, I'll try the sensor coil. I love that this thing has so few parts, there really can't be much more to replace! I suppose the tach is possible, but I wouldn't think it could provide its own voltage.
Also need to check the EGR as I've heard they are prone to sticking on this platform.
Will let you know.

Albert

[Skylar]

I know nothing about the 4A-C electronic ignition.

Does it have the 24/4 toothed wheels like a 4a-ge distributor?
I'm guessing the the ignitor is also the ignition computer in this type of system?
The tacho feed (black wire) comes off the coil negative side or direct from ignitor? <- unplug/undo this and see if tach moves around. Could be shorted inside the tach unit or something.

What does the coil look like? err, i mean is it black or silver red bull can size thing?

You can fix this problem and EGR by swapping in a SR20 or KA24. but you probably have smog in your area, not that it's hard to pass. :(

[blake.]

You can fix this problem and EGR by swapping in a SR20 or KA24. but you probably have smog in your area, not that it's hard to pass. :(


this.