I found an original Denso MAF sensor for Toyota listed on eBay for 24.00$. I took the risk and bought it because even though it's for Toyota, it had the same Denso part number (197-6030) as the original. I paid less than 20.00$ for it with a coupon and I'm happy to report that it's working better than expected even after several hundred miles. I reconfigured the ECM even though I noticed no problems with the Toyota MAF prior to doing so. The thing I did notice was a significant lessening of engine pre-detonation. I have basically no knocking anymore, and the engine still pulls just as hard. This sensor fits Toyotas from the tiny Yaris 4-banger to the Lexus 4.3 litre v8 and dozens of models in between. I've heard some talk about the performance range of a MAF sensor but I really don't think it's an issue here. I'm glad I jumped on it cause I can't find one for less than 70.00$ now.

 

Interesting post that raises some questions Victor.

How many miles on your engine? Reason I ask is that pre-detonation is not that common unless one uses low octane fuel and or something else is wrong such as carbon build up in the cylinder head and on top of the pistons.

Also how did you reconfigure the ECM?

 

Car has 64800 miles in it. I use California's 91 octane premium from different gas stations (probably part of the problem at least is this ethanol soaked stuff). I reconfigured the ECM with a genuine Rotunda Ford VCM and JLR SDD v.131.03. I was getting the most barely discernable 1 second of det at low speed, low rpm acceleration, there's even a technical bulletin for my model, year and VIN (XJ303-04). Det's gone now, and a MAF sensor slowly degrading and losing functionality could be a cause. I'm not betting the farm on it though. I've only had the car for 7 months so I'm still chasing things down. I have yet to exert complete dominance over this cat!

 

Toyota owns Nippondenso, who makes the system for Jaguar.

 

I had used a Toyota MAF for a few weeks on my XJR when I needed a new MAF. Car ran fine but it was under powered for sure. I don't think they are calibrated exactly the same. As soon as I out on the original MAF, it made a big difference in power. Perhaps this is only an issue on the XJR's though because it can get difficult to get accurate readings at higher air flow. Maybe on an XJ8 it wouldn't be a problem.

 

How did you reconfigure the ECM?

 

I reconfigured the ECM with my genuine Rotunda Ford VCM and JLR SDD v.131.03

 

The XJR's MAF is a different Denso part number (DMA-0114) which looks like it's for XJRs, Subarus and Mazdas. I'm guessing you ended up with the same MAF that I got so it makes sense that it didn't work.

BTW I totally dig your rims!

 

Hey Victor. Those are the tools you used. I think Dan was asking what steps you took to reconfigure the ECM using the VCM and software.

 

Ahh.

First I do a hard reset by disconnecting the battery, leaving it disconnected for about 10 minutes, then short out battery wires. Reconnect Battery.

Then, with my DLS 30 power supply hooked up, In the SDD software, in the "diagnose" session, you can choose as a symptom, "Module Problems" (I forget the exact wording), then it gives you "recommended" and "extras" options. First I clear flight data, then I clear DTC's, then I go to "configure existing module" for ECM. The reflash takes several minutes, maybe 15-20.