vtec problem

[choabie]

Ok i just bought a 95 integra with a gsr swap it has a chipped ecu but not tuned.whenever you get on it vtec is kicking in at like 4200 which should be 5200. but when i do hit vtec the rpms go all crazy and jumps from 4 to 8 or 9. what could cause that? its like vtec is not kickin in like it should could it be the chipped ecu?

[khaxnguyen]

it depends, if you have a crazy all motor car you could just be loosing traction when vtec hits. otherwise it would be a bad distributor or ecu programming

[choabie]

it might be the computer the guy said it has a chipped but not tuned.they also had a vtec controller on the car and took it off.but its mostly stock but im planning on turboing it. this weekend if i get it figured out

[mitch lab]

try another gauge cluster and check the alternator.

[choabie]

try another gauge cluster and check the alternator.i got an extra one ill try it.but if it was the alternator what the batt be going dead

[mitch lab]

yea, sometimes it's make the gauge cluster go wack then the car run off the battery till it drain, that's when the battery light comes on.

[choabie]

it was doing it when the guy had it i dont think its that

[1SOL2NV]

change ECU's ..... check VSS sensor also ..check where the vtec controller was and make sure they didnt cut any wires and left them undone ...

[choabie]

thanks they did leave wires undone from the vtec controller but dont know what they do

[scttydb411]

vtec controller wiring harness must be removed. map and vtec wires at the ecu must be re-connected (they get cut and run through vtec controller).

4200 is really low especially if the ecu hasn't been tuned. the tach jumping around sounds like a bad icm/dist. try changing w/ a known good dist and get it tuned.

i'm assuming you don't have any cel. if you do fix those first before doing anything else.

[choabie]

vtec controller wiring harness must be removed. map and vtec wires at the ecu must be re-connected (they get cut and run through vtec controller).

4200 is really low especially if the ecu hasn't been tuned. the tach jumping around sounds like a bad icm/dist. try changing w/ a known good dist and get it tuned.

i'm assuming you don't have any cel. if you do fix those first before doing anything else.i bought a new ecu its doing the same thing. i ran it out the track friday and it was cuttin out bad. i dont know what it could be but it had no power the rpms where going all wack but i figurad it would of ran faster then 10s lol. my buddy has a stock single cam 4 door civic running 10.5 in the 8th so something is wrong