Lost acceleration???
05 December 2001, 07:03 PM
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I am experiencing with a 1995 Jap WRX is that it cuts out the acceleration between 4000 and 5000 rpm. If I suddenly want to take off it will quit accelerating at 3000rpm but if I gradually build the acceleration up slowly it will go to the 4000/5000 rpm and give up acceleration. I also notice it is running without the turbo kicking in. When travelling at constant speed of roughly 60 / 80mph the acceleration will shiver... I am confused... what could it be... Please help
It came with so many electronic gadgets that were removed at the SVA centre in order to pass the tests. The only mod it has remaining is the induction kit. First I thought it was a loose earth wire, but when that was secured... still the same problem.
I believe it could be running on standard boost but at the moment the turbo seems that it is sleeping, because it does not kick in.
Also to let you know which may help is that I had a full service done to it which did not solve any problems, the air flow regulator was replaced, I changed the ECU (from another same year and spec WRX) and had the coolant reservoir changed... still nothing???
It difficult to explain... the car does accelerate, but not under the influence of the turbo it seems. Because when the turbo kicks in, one should feel a sudden burst of energy... but even past the 3000rpm limit when the turbo should come alive... it doesn't. So that's why I suspect the turbo is not even coming in effect. I can't really hear it whirring but that may be because the exhaust is loud. As I accelerate the velocity dies... and then catches up and then dies... It's like when you reach the limit on a restricted car. (But this is derestricted)
It came with so many electronic gadgets that were removed at the SVA centre in order to pass the tests. The only mod it has remaining is the induction kit. First I thought it was a loose earth wire, but when that was secured... still the same problem.
I believe it could be running on standard boost but at the moment the turbo seems that it is sleeping, because it does not kick in.
Also to let you know which may help is that I had a full service done to it which did not solve any problems, the air flow regulator was replaced, I changed the ECU (from another same year and spec WRX) and had the coolant reservoir changed... still nothing???
It difficult to explain... the car does accelerate, but not under the influence of the turbo it seems. Because when the turbo kicks in, one should feel a sudden burst of energy... but even past the 3000rpm limit when the turbo should come alive... it doesn't. So that's why I suspect the turbo is not even coming in effect. I can't really hear it whirring but that may be because the exhaust is loud. As I accelerate the velocity dies... and then catches up and then dies... It's like when you reach the limit on a restricted car. (But this is derestricted)
06 December 2001, 04:15 PM
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Why not get the dealer who you paid for the MAF sensor to go out for a ride in it with you with a select monitor attached.
Afterall, you've paid £300 for a sensor you didn't need - he at least owes you that !
He can use this to watch the boost pressure as you drive, as well as the air/fuel ratio. See if the select monitor reports any trouble codes. If you really reckon you have no boost, watch the 'primary control' parameter. If this is changing, but the boost value isn't reaching around 13/14PSI, then something is wrong with your wastegate actuator or turbo. It could just be the actuator piping messed up after they removed all the gadgets !
Failing that, take it to one of the experts. Power Engineering are nearest to you I think (Uxbridge). Scoobysport is nearby too in Essex. Diagnostic session at PE including power/torque plots is about £100 I think.
Let us know how you get on.
Steve
Afterall, you've paid £300 for a sensor you didn't need - he at least owes you that !
He can use this to watch the boost pressure as you drive, as well as the air/fuel ratio. See if the select monitor reports any trouble codes. If you really reckon you have no boost, watch the 'primary control' parameter. If this is changing, but the boost value isn't reaching around 13/14PSI, then something is wrong with your wastegate actuator or turbo. It could just be the actuator piping messed up after they removed all the gadgets !
Failing that, take it to one of the experts. Power Engineering are nearest to you I think (Uxbridge). Scoobysport is nearby too in Essex. Diagnostic session at PE including power/torque plots is about £100 I think.
Let us know how you get on.
Steve
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