Some concerns. I'm running mines exactly as Dan pictured them (except for the tach signal). Since I'm using my car's ecu and running the MS in parallel I'm worried about Jman's assertion that, quote:"the stock ECU is running different dwell times than what's recommended for Toyota coils".

My problem is that every now and then when I fire up the car I'll get some kind of noise resembling that of a backfire and a little bit of smoke. I checked once and saw some smoke coming from where the injectors are located so I assumed (yeah, I know about assuming :gay that it could be fuel left over. Now I worry about whether the different dwell times may be an issue. If so, should I change those settings?

Thanks,

Rafa

 

yes you should have changed your dwell to 2.5ms in MS.

 

It's not dwell times causing that pop at start up Rafa. It's a rich idle from when you shut the car off or your car is setup to prime when you turn the key on. For some reason MS discharges the coils when you turn the key on, so if fuel is left in the cylinders then it will pop.
You said you saw smoke from the injector area, that could mean you have a leak there. One of those pops could have blown off a vacuum line, that could cause a bad idle. If you have a vac leak your idle will surge or hunt around instead of being stable.
Your MS is running the correct dwell times for your COPs Rafa. That's not something you need to worry about.

 

Ok, thanks to both.

 

They're both set to 2.5ms so I'm ok there.

 

Maybe one silly question:

how much do four of the Toyota coils weight together?

I'm about to order some, but it seems the seller wants to rip me off with shipping costs...

Thanx

Bjoern

 

maybe 2lbs.

 

If this is/was an ebay transaction, then high shipping costs are the norm. Many sellers make a few extra bucks by charging a high shipping cost and hoping that people won't notice and effectively overbid for an item once shipping costs are included with the winning auction price. Good luck.

 

I read the last 10 pages and I am a bit confused. From what I understand 96/97 cars dont need a separate tach input run from the COP's because the ECU gets its reading from the CAS?

The second thing im confused about is the location of the coil plug harness under the hood. Is it the big plug above the fuel injectors or the smaller 4 plug one in the back near the coil?

 

its the plug that attaches to your coilpack!

this has been discussed. use the diagram in the archives. I pulled out all the crap out.

 

Thought so, then its the plug in the back. i have been scared to flash my ecu using the car for power because I wasnt sure. Just kept using my stim.

Saw the archive, wasnt sure. Now im sure, I saw the "edited" date.

 

There are 2 grey plugs to the coils on the 96/97. Those only have 3 connectors because the tach isn't connected there.

 

The CAS has nothing to do it. The ECU always gets its reading from the CAS.

In '90 .. '95 cars the coil packs generate the square wave (by grounding the wire to the tach, ECU just pulls up)

In '95-1/2 .. '05 cars, the ECU generates the square wave

 

Hi guys. I will be using your info to install COPs. Has anyone any experience wiring for sequential firing with a Link ECU?

 

Is there a way to do a basic test on a toyota cop with just a multimeter? I've been searching around and apparently the primary and secondary coils should have a resistance between a certain range, but I'm not sure which leads I need to check or if this is even possible without powering them on and having a more elaborate setup.

 

Nevermind. I decided to just buy everything and try it out. Scored this for a pretty good price from someone who swapped engines on a Celica GT. Not sure what I'm going to do with the manual or the rest of the engine harness.

 

One word... Resell. I'm sure someone would be interested in a manual, and someone else might want a new harness cause theirs was damaged? Ebay it mang!! Good luck!

FWIW, I'm one of TWO miata owners who can't get COP to work.. I'm convinced that the ignitors in my coils are the malfunction.

 

Is it ok to leave the tach input floating on the newer 1.8s? Maybe the cop has an internal weak pull down (up?) making this ok?

 

elesjuan,

Is your car a 99/00? If so the 99/00 ECU cannot drive 2 COPs at the same time.

I am working on a circuit that will enable the 99/00 ECU to drive the COPs in pairs, and also reduce the dwell to what is required.

 

I wasn't finished with the above message, but I am sitting in front of a beach in the Carribean with my laptop, I leaned over to get a slice of pizza, and my belly pressed down on the touchpad!

The 99/00 dwell times are so long that it will make the COPs run very hot possibly overheating.

Anyway, I also have an idea for a circuit that will generate fully sequential signals for the COPs, derived from the 99/00 cam sensor signal. This will make the COPs run half as hot, good for high RPM operation.