my harlan switch has been working fine for a while now, but then today i was pn the highway and got on the gas and blahhhh nothign activated at 5000 rpm like i had the switch set for usually id feel the extra kick from the VI but nothing so later on i opened the switch up and reset it to # of cylinder, and RPM (2k just for a test).... the switch accepted the setting and i started the car up and blah nothing at 2k ... but it did activate at 2500... i tested different rpms and all had a correction of 500rpm ..... so in order for my VI to activate at 5k i have to set the harlan switch to 5500rpm...

has this happened to anyone else ? if so any way i can fix it? will it get worse?

 

The OEM tach is off by a few hundred rpms to begin with, but 500 off is a little more than what I've seen on other cars. Is your Harlan in the engine bay? If so maybe the heat is affecting the values the harlan reads.
-hype

 

I'm starting to think that the Harlan is a piece of junk. So many threads now about problems associated with it. Ugh...

 

Seems to be a quality control issue. I have a light in my dash that goes on whenever the Harlan activates the MEVI, and it has never failed to activate when I hit 5000 rpm. I just ordered a second one to use as a shift light, I hope it's a good one.

 

I currently have 3 Harlans on my '99, and they have worked everytime for over a year now. I did install one on a friends '97 that has flaked out, but one of my Harlans was sent in the same box as his. I'm beginning to think it's less of a defect problem and more of an issue with either a) user installation or b) different model years.

For example, on my car when I hooked the Harlan up to the Rpm lead on the ECU my tach stopped working (went to 0 and stayed). The Harlan worked, but it caused issues on my car for some reason (which has an ECU closer to a 2000). I believe (and always suggest) that the best way to setup the Harlan is from the coil, and many haven't done that so maybe theres more fuel for the fire.
-hype

 

Interesting. That's the way I have mine set up.

 

My 1st harlan worked like a champ, bought in may 2002. But it got water in it and died in feb 2003.

The current one I have is flaky. It works sometimes. And I am tapped into the coil.

HOWEVER, I am moving it inside the car today.

I think the heat issue might have some good merit as well as the parts that are on the rpm switch.

I think some of the parts maybe cheaper or older ( + 1 year )than others.

But there IS something to all of this.

I just can't seem to narrow it down to really anything.

 

I've had the Harlan in my engine bay, wired to the first coil pack for maybe 8 or 9 months now. No problems yet (except irresistible urge to redline car).

 

sorry i havent got back to u guys .. but my harlan is in the "cockpit" and i am using a relay on the switch... tomorrow im going ot install the LED to the switch so i can see when it activates....

i have my set up to the coil pack also i tried the ecu wire but i got the same results as Hype ..that baffeled me so i just ran it to the coil pack...

i really hope the switch doesnt blow or else i gotta wait another 3 weeks for a new one..