Forum:
It would appear that my mass air flow sensor on the yrv 1.3 4trak is on the way out...the car has a real flat spot, and the MPG has dropped by 10 MPG!! and there is a slight occasional surging of the tickover at junctions. I've unplugged the maf and it runs much better. Does anyone know where I can get a new one, (or at least a good, low mileage second hand one? are they the same on the terios or anything else?). I've tried a few google searches but nothing, so am assuming they are dealer only?
Thanks,
Matt.
Hello. I believe the YR 1.3
Hello.
I believe the YR 1.3 engine is the standard 1.3 K3-VE engine. This engine was placed into quite a few models that Daihatsu sold at the time (Except some 1.3 Sirions, as these were a slightly different engine, K3-V2 ), So basically look at any of the following:
- YRV 1.3, Radical, Premium, 4TRak, f-speed (Not Turbo as it's a K3-VET engine)
- Terios 1.3
- Copen 1.3 (Produced from 2006 onwards, before then the engine was a 960cc K3-DET)
Plenty of scrappers on E-bay, there are 1.3 YRVs that might suit your needs. Maybe worth comparing your engine layout with pictures on E-bay.
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'12' Plate Mazda MX-5 2.0 litre NC 3.5 Venture Roadster 160BHP
'15' Plate SEAT LEON 184 FR TDI. 240BHP/500nm Torque.
Past: '53' Plate Yellow YRV Turbo Approx. 150BHP
They dont have a MAF, They
They dont have a MAF, They run on MAP sensor.
What sensor have you unpluged?
MAP not MAF?
It would appear to be the idle air control valve sensor that I unplugged, it did improve things though...thanks for the heads up. Right, need to go and read up on MAP sensors, could they affect the fueling like a MAF would?
If the MAP sensor is faulty,
If the MAP sensor is faulty, unlikely car would start/run at all.
They either work fine, or they don't work at all.
bit of an update..although no change.
Thanks to everyone for their suggestions. I got a MAP sensor from a low mileage sirion 4trak, I fitted it and after about 3 miles the engine management light came on (even though it seemed to be running slightly better), the fault code came back as O2 sensor Bank 1 sensor 1 (the one in the manifold if I recall). The car is still achieving 26 mpg! instead of it's usual 38-42mpg.
So, I'm stumped again. Theres no abovious leaks of air, exhaust gases or fuel, the car runs well at high revs, but theres a real flat spot around 2750 to 3250 and is generally sluggish even below that...this often results in having to drop down a gear. I'm wondering if there is a coolant sensor that is basically could be keeping the "choke on" so to speak. (or choke like fuelling conditions).
Alternatively, the 1.3 has variable valve timing doesn't it? if the cam sensor was faulty could it be holding it in the higher rev cam setting?
My local mechanic just suggested closing the gap of the plugs might help, but I've also be reading with interest on this forum about the mail coil igniter or even the problems faced by others with regards to injectors blocking.