Hey ppl posting for a mate of mine. His zed is running rough and breaking down when it comes on boost. Also no signal getting to the temp sensor. I am wondering what it could be. He had some of the wiring replace lead up to the sensor thinking that was the problem. I realise it could be the ptu but it's not cutting out completely. So then i was thinking maybe some of the coils have died. But it runs when while the car is park, reving the engine up and still not breaking down only when driving. Is there away to pin point to see what it maybe? He just doesn't want to replace a whole heap of parts to work out what it maybe. Well guys looking forward to your thoughts on this. Thanks in advance
Check the plugs and coil packs. If the temp sensor is faulty, it will be running rich, possibly fouling the plugs, look at that first.
probs The temp sensor is new. He had the car put in the shop to have the air con compressor replaced. They broke some wires in the harness had them repair now it just runs upto shit. Also doesn't help when the harness looks butchered. Is there much effort in replacing the whole harness
My guess is that you have a failing injector or two. Ohm test the injectors, they should all be within 11-14ohms. Test the harness before you pull it. For the coilpacks perform a power balance test. Pull one coil pack at a time checking to see that the rpm's drop. For the injector side, pull the ECU harness from the ECU and test the injectors "through" the harness to see that the ECU is getting a good reading. Like I said, my guess is you're injectors are out of spec, *or* you could just have bad/fouled connections. If you see green contacts on the connectors, get some good electrical contact cleaner and go to town! If you end up replacing the harness, be prepared for some bloody knuckles if you are doing it with the motor in. Cut the old harness out (saves time) and when you get to threading the ECU connector through the firewall, you'll have to pull the pins from the smaller subconnector in order to fit everything through. If you have any questions just ask.
Yes its a big Job to replace the harness. If the aircon dicks broke the harness, who repaired it? and was the car running well before the aircon people touched it. Its unusal for the injectors die, although not unheard of. check the injectors connectors- coil pack connectors, and plugs. Even if the tempture sensor is new, the ecu will not get a signal from it if, the wires are damaged.
boost probs Yeah it was fine before he had it sent in to get the air con compressor changed then when he got it back it was running upto shit. They broke 2 wires in the harness and since had been repaired but the problem has still been there. But what gets me while the car is parked and reving the engine it doesn't break down. But once driving and comes on boost it drops it arse. Ok well i'll check the ohms on the injectors and drop the coils out while the car is running to see if i can find the problem that way. But there isn't a signal getting to the temp sensor. The temp sensor has been replaced with a new one so i'm guessing there is some problem in the wiring there maybe. Got me stumped
What you described sounds like a dying coil pack. The spark gets blown out soon as you hit boost, weak output from the coil pack, weak spark,hit boost, no spark.It could also be any number other things as well.
boost probs Is there a way that i can identify what coil might be the prob? Because it's doing it under load would make it harder to diagnose yeah?
Ohm the coilpack if you are worried, however they *rarely* go bad. They should read, .7-.8 ohms from left pin to center pin. What spark plugs are you running? PFR6B-11B's I hope? If you are running a generic plug....
Well i'm bring the zed to my place Hopefully i can work on it a bit more and eliminate some of the things that people have indicated could be the problem.
boost probs Well i took it for a spin today i'm pretty sure it's got a big boost leak. Hence the hissing sound. But also checked the pretty much every electrical conector on the engine bay. A few were corroaded others where fine. Took the pipes up that lead to the throttle body and they were split fairly well. But looking at the handy work of someones rewiring. I'm sure a pre schooler could do better. Would anyone have a set on the pipes that go from the throttle body to the intercooler pipe that they want to sell. I wanna see if that's the prob.
boost leak As suspected. Intercooler to Throttle body pipes where leaking as where 2 others. Thanks all for help
