okay, so earlier i posted that i changed my chassis harness on my GTU and then the car wasnt starting, at first i put the battery backwards yes a very stupid mistake, so i took off the battery , charged it then put it correctly, car wasnt starting i noticed i blew a main fuse so i replaced it took off the dash went threw all my fuses and they were 100% so i went threw every plug and bam!!!!! one wasnt connected by the ignition. So i started my fc and damn it revved high and blew out white smoke (didnt have the tach on, and my car never did that prior) so i turned it off the car connected the tach on, started it up again and high *** rev, my tach went up to 7k and down to zero so my buddy told me to wiggle the key a little tach arranged itself and revolutions were at 7k blowing out white smoke, anybody have any idea what could have happened? many have told me it was the ecu??? any ideas? i would greatly appreciate the help thanks


okay so i solved the problem there
there were wires that were cut by the trailing coil so i crimped them together and the car started without white smoke so i was happy. But still my headlights are not working and my car is revving high when i start it and leave it on idol I drove it around the block and i didnt even need to press the gas the car was just revving and the tach was acting up bad it was at 0rpms all the way it wasn't safe to drive so i parked it in my driveway so anyone have any idea?.

before i swapped the chassis harness my tach was working and the car would not act up like that
so should i try a new ecu??????
any suggestion i would greatly appreciate them

 

anyone??? have any idea

 

anyone might know whats wrong
i am going to record the problem with my camera in a little bit
so yeah
someone kind enough to help me out?

 

http://www.youtube.com/watch?v=PGuvSVetRYA

 

I'd guess that you have a wiring problem, possibly in your chassis harness.

Check your wiring, and connections.

 

well my chassis harness looks way better than my previous one
and there doesnt seem to be a problem in any of it
any idea where i should go back and look into?

 

anyone else want to take a took at the video
to probably see or find out what my problem is

 

I might actually try swapping out the Trailing coil. That seems to be the leading cause of no tach.

 

are you serious?
hmm
well
if you want i can take a picture of what i crimped together
maybe that might give you a picture of my little situation

 

You can.

 

Check this out!

https://www.rx7club.com/showthread.p...ailers+no+tach

I really hope whatever wire you crimped, wasn't the tach out put and I hope you didn't ground it.

 

so what you are saying, is that the tach reads off the trailing coil?
well here are the pictures,hope other people have time to help out with my dilemma but yeah here are the wires that were not together
but i crimped them but im thinking of welding them

 

Huh, looks ok. I would grab a multimeter and test your coils anyway. It won't hurt.

 

a multimeter?
sorry im young and still learning all the terminology

what about the situation where i put the battery backwards?
could that have done any harm to the tach? ecu?

 

No, that would have just blown your main fuse (referring to the battery situation). A multimeter is a tool used to check currents and outputs. You can pick a cheap one up at sears for 20 or so. I wouldn't get a really expensive one but I would say not to buy the cheapie either, they do come in handy! Try even check your local automotive store, they may have some to rent if you don't want to buy.

 

okay got it ill look into the multi-meter
and see whats up with my trailing coil

so could that be the reason its idling high?
and my tach is not reading?"

 

Its probably the reason your tach is dead. I'm not sure about high idle, that may be another issue, but lets get your tach up and running again and then we'll deal with the idle.

 

okay i am going to get it check out at autozone
i heard they check them so ill keep you posted dude
thanks

 

good luck.

 

The tach signal comes off the trailing coil.

The trail coil will not work if one of the sparkplugs is fouled real bad.

The trail coil will not work if one of the three wires from it to the ECU is corrupt/broken/open.

The tach signal leaves the trail coil on a yellow/blue wire. That yellow/blue wire is splicedtotheblackbulletconnectoratthetrailcoilneve rgroundthatblackbulletconnectorbecauseitisatestcon nectorforatroubleshootingtach.


k i n d a h a r d t o r e a d w h a t y o u wrote

The ECU is not the high rev problem nor the tach problem. Your rewire is possibly the problem. But we don't even know what series car or if non turbo or Turbo.

The white smoke indicates, possibly that the oil control rings are kaput in the engine. Just a possibility.

 

so i got my multi-meter, now how do i test my trailing coil pack?

(and if your on the forum and are just going to bag on how i am a noob
please grow up i dont have time for you)

 

Invest in a haynes or FS manual. They are priceless.

 

well i got the FSM bookmarked
so what do i do from now?

 

Should be under the electrical section. I'm not familiar with the FSM. I would also check Ignition if you can't find it. It'll show you procedures on how to test it.

 

I think its pg 33 under Engine electrical....it starts there.