Guys,

Can someone please tell me if there is a good source for a MAF sensor (new) that is guaranteed to work. I've tried two Cardone sensors from partsgeek, and I've tried a used replacement, and I still have MAF codes. I don't have the codes written down nearby, but there are both maf related. I have not sprung for the $400 dealer part, but curious if you all have had overwhelming good luck from a specific supplier. Thanks -

 

After that many sensors I would begin thinking that the MAF isn't the problem. Just because it's mentioned in the code description does not necessarily mean it is the problem.

 

Look further for the problem.

 

Ebay has them way cheaper than 400

 

+ 1 to the above, its not your MAF causing the codes

Post up your codes here and we'll give you other avenues to explore.

 

The car throws the following codes:
PO101 - MAF range per problem
P1647 - O2 malfunction (left upstream)
P1260 Security input MAF

Also runs rough for the first 2 minutes in the morning, then calms down and runs great after that. I do have a gas smell while driving as well.

Here's what I've had done recently in the last 500 miles:

-Valve Cover Gaskets
-Plugs and Seals
-Fuel Pressure Regulator
-Replaced intake
-Checked for vacuum leaks
-MAF Sensor (x3 - 2 new aftermarket, 1 used OEM)
-New thermostat
-Full timing chain kit with tensioners

I have NOT changed any 02 sensors, and I am getting a fault for one upstream O2....that said I can't imagine it's the source of all my codes or the rough running issue that I have a start-up. I'm about to pull my hair out....been working with a friend on this who is an independent, and trying to avoid the Jag dealer if at all possible.

 

It was not on your list so I need to ask a basic question...what is the condition of your air filter?

 

1260 has absolutely nothing to do with the MAF, it is an ignition key transponder malfunction.

1647 will cause you performance and economy losses but also has nothing to do with the MAF.

0101 is the 'MAF issue' and normally, on almost every make I've dealt with, is a result of 1) an air leak between the MAF and the throttle, 2) contaminated MAF, usually a result of a) crankcase ventilation problem, or b) something stupid like a K&N air filter (they should include a can of spray-on hair with each filter.) Remove the snorkel between the MAF and throttle body. If you find the tiniest hole, crack or split fix it or replace the snorkel - they're about the most reasonably priced part you can buy from the dealer. Probably less expensive than three lug nuts! Make sure the attachment of the snorkel to throttle body isn't compromised and that the rubber mounting is in good shape and not swollen or distorted. What I'm getting at is most people think of 'vacuum leaks' as being between the intake valves and the throttle blade(s), the snorkel tube, etc. is much more an issue when you're working with the MAF.

 

Air filter is new.... I will check closely for cracks near and around the MAF.

The initial rough running and stalling at each morning at start-up ....why would that be calming down once the car is warmed up, if my problem IS a MAF or o2 sensor? Could either of those issues aust those initial symptoms and then clear up like that?

 

You need to check for leaks everywhere, especially between the MAF and the throttle body - not just near the MAF. Inspect the convolutions in the snorkel, they are notorious as are broken attachments to the throttle body.

 

Yep - sorry, that's what I meant....I'll check everything that's made of plastic or rubber!

 

A quick follow up to this....I came across a great contact in a Jag technician that lives about 20 min away from me, and he agreed to help on the side. Long story short, all of my issues were the result of a shorted upstream 02 sensor which was affected the ECU's ability to do it's job. No more check engine lights, no more gas smell, no more rough idling at start up, etc. I'm going to drive it for a few days to make sure, but it seems to have done the trick. Lots of time wasted with my indy friend who was trying his best, but we replaced several parts that were not necessary. We even went back to the original MAF after seeing the short and long term fuel readings still in the negative, even though the CE light was not coming on. Put original MAF back in, all readings back to zero within a couple minutes. Car runs great, and I'll post a follow-up on here next week after I've driven it for awhile.

Long story short,

 

Congrats!

 

Glad you have it sorted

Nik

 

Great!. Enjoy Sunday funday and drive...

 

OK, so the car runs great, but I still have one problem that I haven't specifically asked about, so here goes. The inside of the car has a very strong gas smell still. Especially inside the car, not so much outside in any certain spot that I can tell. The worst is if I drive it for awhile, park it, come back to the car a few minutes later and get in, it's extremely bad. It will almost make your nauseous driving. That said, no more running issues, no CE light, etc....I'd really like to get to the bottom of this, as it almost makes it undriveable.

 

To others, blast has started another thread about the gas smell, as to not go off topic here. Good decision Steve.

BTW, a good OBD scanner will show you not only fuel trims, but the voltage of the 02 sensors themselves, when one is outa wack, it'll be easy to notice which one, and easy to diagnose if its the sensor, or a short in the wiring, which you obviously found. Sometimes, just seeing all that data thats available reveals other options of diagnosis. Get yourself an early birthday/Christmas gift and find one.