JasonST

Ok, so i posted this problem here a few months ago and the problem went away on it's own somehow, now it's back and it's haunting me cause I can't figure out what it the problem is. Ok, the problem is that right around 6500 rpms the tach starts bouncing everywhere and will revlimit at 6500 rpm because the tach signal is cutting out, this is what i was told by a tech when I got it looked at. He told me to buy a new dizzy, so I did, didn't fix the problem at all. The problem is the tach signal is somehow dropping our in the higher rpm band and I don't know why it's only at high rpms, loose connection somewhere but I don't know where. I've double checked all my grounds, all connections to the ecu, connectors at the shock tower everywhere they're all good. O and I've also tried a different ecu and same problem! Only cel i'm getting is for EGR because this is a swap. The interesting thing is that when the engine cuts out at 6500 rpms the CEL actually turns off, which is weird it's like the ecu loses power or something, but then will rev back down fine like nothing ever happened, just won't let me go past 6500 rpms.
Info: H22a, replaced dizzy, tried another ecu, no cels that would lead me to the cause of this problem. Grounds are all good. Any ideas? Please any help would be great.

Cory man

Your igniter is faulty. It sends a signal to the tach which will bounce when the igniter is failing. hth

JasonST

Hmm, I wonder why i even bother saying that I've already replaced the dizzy with a brand new OEM one.... The ignitor is in the dizzy so that's not the problem. Anymore help?

harlen

sure there's no other cels, such as vtec solenoid?

djsire

My car used to do that when vtec wasnt coming on.

turned out to be a dent in my oil pan.

JasonST

Got it fixed about 2 weeks ago finally! The ground on the Throttle body was partly loose, and just it being partly loose made it do this, tightened it back up and it's fine now.