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This will be my first post, thanks for a great forum !
I've recently purchased a exhaust system from Design911 in the UK which has the valvetronic function on. This is said to replicate the PSE which my car does not have factory installed.
Wired it up and put the vacuum hoses, tested the system and it works fine.
Over to the issue for my car:
When starting up the car, the neutral positon of the valves is open, which means a lot of noice from the exhaust.
When switching this by the solenoid, sending vacuum into the system and the valves closes. This means less sound.
But when the valves is closed the car wont run properly at the RPM range of 5500-7000 RPM's there is also fault codes for misfire on cylinder 2.
The strange thing is that this works perfectly when the valves is open. I've tried two differnet vacuum sources, into the ressonator and also for the left hand side cooling system vacuum solenoids. Without any differnce. I tried to run vacuum directly to the vacuum actuators on the exhaust without any difference and also tried manually applying vacuum and using a one way check valve to keep the vacuum while not connected to the cars vacuum line. No vacuum leaks, no fault codes when driving with the valves open.
Same result every time. So have anyone had some similar issues to their car ?
Thanks in advance for any help !
Hello there, this is my first post here and I’m writing because of problem with my boxster.
Today in the morning I’ve started my 2002 boxster and noticed strange sounds from the engine/ rear side of the car
It’s a metallic, grinding sound like a loose piece of metal or something like that
Sound disappears when you press gas and comes back once you loose the pedal, I don’t know if it changes while engine is warm
Also, check engine light shown up yesterday, when I connected my BT OBD2 there was no error code.
I came with that to workshop also, and they said it’s a catalyst efficiency error.
I’ve had that error code a while ago, I’ve replaced mass air flow meter and check engine light disappeared.
I think it might be a problem with maf again because I bought not the cheaper, not the original one, but why are there these strange sounds? I’m worried about this. Could it be catalyst this time? Or again should I replace maf? This time I’ll buy original one.
here are two Videos I made
Also I’m sorry if you can’t understand something, my english is not perfect.
Thank you for all replies, I hope we will solve that problem together
Have 03 C4S 55K mi. Both Cats going bad. getting CEL after every 50 to 75 mi. First from bank 1 and now bank 2. Have basic Torque App software to reset. Pain in Butt.
I track car about 3 times a year. No car mods. Run for fun.
Looking to boost HP via new performance exhaust system. Thinking Headers and Sport CATs from Fabspeed. Factory mufflers are original, seem fine and would like to reuse.
Along with perhaps new clamps, gaskets and a few new bolts, does anyone have advise on this?
I installed a complete Used FVD Brombacher exhaust this weekend. Headers, Cats, Mufflers, 02 Sensors. When installing the FVD exhaust I noticed that the post catalytic O2 sensors were on opposite sides of the stock headers. (2001 C2 Manual) The leads were not long enough to go to the opposite side connectors. So I plugged them into the sockets closest to them. I was able to drive for about 30 miles until the CEL light came on. I noticed the idle was a little off, would fluctuate between the 760 - 860 range I think . Car drove fine. When I got back home I checked the codes.
P01030 O2 Sensor Curcuit Bank 1
P1130 Oxygen Sensing
P1126 Oxygen Sensing
P0300 Random Misifre Detected
P0306 Misfire Cyl 6
P0304 Mis Cyl 4
P0305 Mis Cyl 5
02 Sensor Output 0.0v Bank 1 Sensor 1
I hope you enjoyed my drawings.
Would this be due to the post cat O2 sensors be plugged into the opposite connectors? Plugs and tubes were replaced about 6K ago, all the coils looked fine. The 02 sensors came on the exhaust. Could this just be a bad O2 sensor? Would it be advisable to get the DME re tuned for the new exhaust?'
I've recently started changing exhaust components to obtain the exhaust note that makes me smile on my long drives to work. First I purchased a used Instant-G muffler and C pipes from someone who had a 3.6l conversion. In fact, I think this exhaust system was made for the 3.6 conversion as a kit. It sounds very nice and 2.25 inch C pipes and inlets -- low tone sonics. I had a drone at 3K that was quite loud, but a lower tone, still good sound -- but made me tired on long drives. I decided to install 2 inch down pipes from the stock headers to the 2.25 inch C pipes. The drone is completely gone. In fact, I miss any sound without throttle. Albeit, it's a nice departure from the drone sound, it would be nice to have some sound when I let off the throttle. When on the throttle it sounds very nice!! And surprisingly, the car feels much less strained when accelerating. It's like a different car, like it can breath now. Lots more power even at lower RPM, and throughout the power band. I really like the way it easily accelerates at any speed.
So, a few questions:
1. How can gain back some of the lost sound on deceleration? -- Not a top priority, but if changing something means not having the power the way it is now -- then not worth it.
2. Since the system is now essentially restriction free except for the minimally baffled muffler -- is this in any way harmful to the engine? It feels like the motor runs easier with less strain.
3. I tied the secondary O2 sensors up and out of the way. No CEL, but is this some how harming the ECU's attempt at a stoichiometric O2/Fuel mixture. I'm assuming that no default program is triggered by the lack of proper signal these are now sending to the ECU.
4. What do you think of this setup?