Terrano 2.7 tdi MAF and management light

[(RIP) rustygates]

I've bought and old 1998 Terrano to tow a trailer. Pretty sound condition but wouldn't pull your hat off. My brother and I changed the MAF sensor (bosch) with one off his 52 registered Terrano and whoaaaa its runs like a rocket. I ordered a MAF off ebay. It arrived this morning and I've fitted it assuming that in 10mins I'd be flying. Took it for a drive and it went like a rocket for 30 seconds and then the engine management light (EML) comes on and we're back to driving at the speed of a snail again. Further on the test drive the EML goes off and we're flying again but it only lasts a few seconds before the EML comes back on and turbo slug is back again. It does this a couple more times and settles down with the EML on and no performance. Any ideas? Brother lives too far away to go over & try his MAF on my Terrano and my MAF on his to see what happens. I'm also a bit concerned about putting the EML on his and not being able to get it off again. I don't want to end up with two Terrano 2's that wouldn't pull me out of bed!!!

All sensible suggestions welcomed.

 

[R1cho]

well as the maf is an airflow sensor i'd be checking all air filters and air intakes i may be wrong but cant hurt to check

 

[briggie]

id try the codes and see what pops up

http://www.nissan4x4ownersclub.com/downloads/workshop/wk29.pdf

 

[clivvy]

well, thats either a faulty MAF (not unheard of) or an issue with the air flow. it could be that you had c rap on the gauge before the MAF, or even in the filter housing, and the act of it pulling better has sucked more crap onto the MAF causing a bad reading. As you suggest, ideally you would test it with your brothers to figure out if its a faulty maf unit or not. Is the one from ebay definately new?

 

[Timbo_1975]

Pull codes, but also:

Either a faulty MAF or a broken wire in the harness (where it is clipped around back of engine)

Get a DVM hooked up and check the output (pin3)

idle - just under or around 1v

Full throttle 2500rpm upwards 4.3+v

Smooth transition between these points.

Pin 1 - 5v
Pin 2 - 0v.