im gettin a weird rpm spike whenever i try to rev hard past 4000rpm ive tried groundin the shieldin cable, changing spark plug wires rechecking the injector harness it bucks kind of bad like the injector doesnt fire or something

 

its a s4 turbo2 with a haltech e6x if anyone has any advice or help i would appreciate it. thanks to all for your time

 

Grounding the shield?
Are you talking about the CAS wires?

If so, don't do that!
It's already grounded on the ECU side,and grounding both sides causes more headaches.


-Ted

 

yea i grounded it by the ecu but if its already grounded then i guess i dont need to then my next move is to move the magnets inside the cas closer to teeth to see if gets better signal

 

this made the biggest difference for me. It worked better but still did the same thing. I changed out the CAS and did the same magnet thing and haven't had a problem since.

 

ok im getting a little fustrated with this haltech. i tried a new connector and new cas and it stills spikes. when i turned the car off and back on the haltech is not getting any signal at all while cranking. but when i take the cas out of the car it fires the injectors and the sparks right up. i didnt do anything different other than change the connector and try out another cas and cut the ground that was ground the shielding cable i tried grounding the shielding cable from inside the car but someone told me its already ground at the ecu. can someone help with. also when i turn on the ignition before cranking the leading coil sends out with this. and also when i turn the ignition on before cranking the leading coil sends a spark and the motor backfires.

 

You need to adjust the gains and filter settings and there may be a problem with the actual CAS wiring itself.

Adjust the gains/filters first and go from there.

 

What firmware version on the E6K are you using?

What Haltech proggie version are you using?
v6.34?

If he's using a v6.xx proggie, he can't adjust gain / filter on the ignition inputs.

Long shot, but where are the main engine grounds?


-Ted

 

well the grounds for the ecu are under the dash but was told to run it straight to ground on the battery or where the negative on the battery grounds. and also the battery is in the back so it wouldnt be too much of a problem to run them back there. and where do you check what program version i have?

 

i think i have the 1.26 halwin v

 

I thought he said he was using an E6X

Yep, adjust the gains and filters and go from there.

 

i adjusted em all the way through the range and it got worse and never was the same after i adjusted. i was able to rev to 7000 with a little hesitation and now i wont rev past 4000

 

then something HAS to be up with the wiring.

If you can't return it to the state is was when you began adjusting settings in the Haltech by simply turning them back to where they were at the beginning - there is no problem with the ECU.

If the conditions change without changing settings (ie. you say "it never was the same after adjusted"...) or you get different condidtions with the same settings then something either in the wiring, or in the signal going to the ECU is varying and causing these issues.

I would start by undoing any extra grounding you've added to the shielded cable.

 

i did that my next suspect is grounding the ecu to the battery ground and making sure the battery has a good ground back there. also is there a reason why the leading coil spark when i turn ignition on before cranking? is that bad grounding?

 

Oops, sorry, getting the posts mixed up again. :P


-Ted

 

Set the Trigger gain to 1 and Home gain to 2.

Filters on 1 for both from what I recall.

I agree with El Senor ClassicAuto -- wiring problem on the trigger harness would be the first place I'd look.

B

 

yea i figured it out the alternator wire was falling right off the alternator it was weird but fixed that and the car started and revved ok but still gettin some intermittent spiking not as bad as before but i think now im goin to ground the ecu at the battery and not under the dash