getting tach at coil or injectors

Hey guys, I seem to find it increasingly harder and harder to get a good tach singal and have to do remote starts by voltage sensing.   I keep hearing people saying go to the coil or an injector but have no idea where i would look to even tap into for that. Any info on tapping into a coil or injector would be great. Especially if you got pictures you could send my way. Thanks Alot -MikeDriving a Bagged, Caddied 02 s10

yup it does.. now to start testing on my own cars and learning to locate them.. Driving a Bagged, Caddied 02 s10

Can't seem to get a stable tach voltage on a 2002 nissan sentra. I used the injectors, but im getting much higher readings, and no change with the rev of the engine. On the sentra, the common color is BLACK/ red so I tried testing all the odd colors on each injector. I also went into the instrument cluster with the color described and didn't get a good signal there either. Anyone know where the PCM is at on a 1.8L?

ac 200.

Cant figure it out, i probed 6 wires on the injectors, I connect my black end of multimeter to ground, and probe with red, I get 30 everytime

Take the RED lead to 12 volts and the BLACK lead to the target wire. You will get a reading from 1.0 +, works for me everythime this way.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

is that really how ur supposed to meter ac wires? Driving a Bagged, Caddied 02 s10

THat's one way of doing it. Because it's AC it doesn't matter wether or not the leads are on ground or 12 volts, but I always use 12 volts on the red lead and the target wire for the black lead. If I can find the thread from last year, I'll link to it, but there was a good discussion on how to meter for a tach with the DMM Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

"I seem to find it increasingly harder and harder to get a good tach singal and have to do remote starts by voltage sensing." Welcome to the club! I agree it is getting tougher to find a good clean tach signal. Luckily the voltage sensing reliability is also getting better and better IMO. We have used tach inverter/boosters on occasion and they seem to clean up the signal and work fine. Unfortunately even using the coils and injectors on some newer vehicles isn't the best way to go because the signal just isn't clean enough for proper operation. Not to mention the risk involved. I'm not sure what happens when you ground out one of the wires on the injector or the coil, but I'm sure it's not pretty. By the way most newer vehicles DO NOT have a common wire at the injectors you basically have to meter the 2 wires or take a good guess. For testing I use the black lead to ground and the other lead to the wire since it is AC it doesn't make a difference either should work it's just whatever your preference is. Good luck, Mike