I've done several searches on this topic and done the grounding "mods" in an attempt to solve my now violent 3k hesitation with no luck. During my recent rebuild and install I remember connecting a ground wire to the housing of one of the ignition coils. If this one ground is bad could this be the source of my problem?

FYI: I did replace the engine wiring harness with a new one from Ray Crowe but not the ignition coil harness.
Thanks

Steve

 

Why not just clean the ground attachment point and see if this works? The wire itself is not likely to be the culprit.

You should probably clean all ground attachment points that you can - but this may not fix the problem. The only sure fire fix is an aftermarket (non OEM-based) ECU.

 

Purchase the updated ignition harness from Mazda. Its less than $100 and does not have the failure-prone ground. The 3k rpm hesitation has to do with the injector staging. I can't believe Mazda released the car in that state. On some cars it is more pronounced than others. Additional grounding sometimes helps, but not completely. One more reason to ditch the stock computer.

 

When I had the 3k hesitation, I put a ground from the battery to the firewall, cleaned all other grounds, cleaned all my spark plugs (read it from a 3k hesitation post) and disconnected my battery to reset my ecu. Never had any hesitation since then.

 

funny, resetting my ECU and driving while cold seems to bring out my 3k hes.

 

Really, the 3k hesitation is something that can be reduced but never really eliminated. The only real way to get rid of it is a PowerFC - it's AMAZING the first time you drive your car with one and don't have a big ol' jerk at 3000 RPM!

Dale

 

Thanks for all of the responses guys. The reason I was asking about this one specific ground is because I remember cleaning all of the others before reassembly, but not sure if I did this particular ground. Currently I am running the stock ECU and will replace the ignition harness as suggested by Rotory Experiment Seven. I just want to get the hesitation reduced until I have that extra grand available to spend on a Power FC.

I wonder, has anyone noticed a stronger hesitation after going from a stock port to a street port and still running the stock ECU?

Thanks
Steve

 

That ground is only a shielding around the signal wires to the coils, no chance it can be related to any hesitation.

Might be worth checking the other main engine bay harness where the ignition harness plugs in. About 2 inches down from that connector the wires merge into a large bundle, this junction is a prime location for insulators on the wires to crack and short. Fire the car up at night and move the wires around in that area, if you have a problem you will see lots of arcing.